Karl Fischer Reagent Selection Guide Exporter China — VicoMeter | Jiangsu Victor Instrument Meter Co., Ltd.

VICOMETER — Moisture Analyzer Reagent Selection Guide

VICOMETER

VicoMeter VICOMETER

Moisture Analyzer Reagent Selection Guide

Karl Fischer Reagent Selection Guide for VICOMETER Moisture Analyzers

Applicable instruments: WKT-A series (coulometric) · WKT-C series (volumetric)
Methods covered: volumetric (one-component/two-component) · coulometric (with/without diaphragm)
First-choice recommended reagents: Tianjin Saifurui SFR · preferred imports: Honeywell HYDRANAL / Merck Aquastar
Standard reagent shipped with instrument: coulometric KFR-C02 ｜ volumetric KFR-03(Suitable for most industries and samples)
Applicable industries: pharmaceuticals · chemicals · petroleum · food · electronics · new energy
Version: V3.0 | Date: August 2026

Step 1: Select the Measurement Method

Choose the volumetric or coulometric method based on the estimated moisture content range of the sample. This is the first step in selection and determines the subsequent reagent type.

volumetric Volumetric

Applicable Moisture Content:0.1% ~ 100%
Instrument ModelWKT-C Series
Principle:The titrant is precisely dosed through a burette, and the moisture content is calculated from the volume consumed
Features:Wide application range, simple operation, low reagent cost

→

coulometric Coulometric

Applicable Moisture Content:1ppm ~ 1%（<1%）
Instrument ModelWKT-A Series
Principle:Iodine is generated in situ by electrolysis, and the moisture content is calculated from the electrolysis charge
Features:Extremely high sensitivity, no titer calibration required, ideal for trace moisture

Quick Check:If the sample moisture content is > 0.1% (e.g., more than 100mg of water), choose the volumetric method; if the moisture content is < 0.1% (e.g., ppm level), choose the coulometric method. When in doubt, a preliminary test is recommended before deciding.

Step 2: Volumetric Reagent Selection (WKT-C Series)

Volumetric reagents are divided into one-component and two-component systems.The first choice is the Tianjin Saifurui SFR series reagents; for imported reagents, Honeywell HYDRANAL and Merck Aquastar are preferred.

★ VICOMETER Standard Reagent Shipped with Instrument (Volumetric)

KFR-03(Pyridine-free · one-component · titer ~3 mg/mL) — the standard reagent shipped free with VicoMeter WKT-C series volumetric moisture analyzers.
Wide Application Range: Covers the 0.5%~10% moisture range and is suitable for routine sample testing in most industries such as pharmaceuticals, chemicals, petroleum and food.
Ready to Use Out of the Box: Start testing without additional purchases — the first-choice general reagent for daily testing.

Reagent Recommendation Priority: First choice: Saifurui SFR Preferred imports: Honeywell HYDRANAL / Merck Aquastar Others: Sinopharm Hushi / Mitsubishi AQUAMICRON

2.1 One-Component Reagents (Composite / Single Bottle)

Titer	Applicable Moisture Content	Sample Type	First choice: Saifurui SFR	Preferred imports: Honeywell / Merck	Selection Tag
~0.5 mg/mL	0.01% ~ 0.5%	Extremely low moisture: dry solids, pure solvents	KFR-15 (pyridine-free)	Hydranal Composite 1（34827） Aquastar CombiTitrant 1（1.88001）	volumetric
~1 mg/mL	0.01% ~ 1%	Low moisture: dry solids, organic solvents	KFR-1 (pyridine-free)	Hydranal Composite 1（34827） Aquastar CombiTitrant 1（1.88001）	volumetric
~2 mg/mL	0.1% ~ 5%	Medium moisture: chemicals, APIs	KFR-2 (pyridine-free)	Hydranal Composite 2（34806） Aquastar CombiTitrant 2（1.88002）	volumetric
~3 mg/mL	0.5% ~ 10%	Medium-to-high moisture: general chemicals	KFR-03(pyridine-free)Standard with instrument KFR-06 (methanol type)	Hydranal Composite 2（34806） Aquastar CombiTitrant 2（1.88002）	VICOMETER standard
~5 mg/mL	1% ~ 100%	High moisture: food, aqueous solutions, slurries	KFR-05 (pyridine-free)	Hydranal Composite 5（34805） Aquastar CombiTitrant 5（1.88005）	volumetric
~3 mg/mL (with pyridine)	0.5% ~ 10%	Traditional formula, high reactivity	KFR-08 (with pyridine)	—	With pyridine
~5 mg/mL (with pyridine)	1% ~ 100%	Traditional formula, high reactivity	KFR-09 (with pyridine)	—	With pyridine
~5 mg/mL	Aldehyde and ketone samples	Compounds containing aldehyde/ketone groups (side reactions with methanol)	KFR-04 (pyridine-free, for aldehydes and ketones)	Hydranal Composite 5K（34816） Aquastar CombiTitrant 5 Keto（1.88006）	For aldehydes and ketones

2.2 Two-Component Reagents (Titrant + Solvent)

Titrant	Titer	Matching Solvent	First choice: Saifurui SFR	Preferred imports: Honeywell / Merck	Selection Tag
Titrant 2	~2 mg/mL	General solvent	KFR-T1 / KFR-T2 (pyridine-free)	Hydranal Titrant 2（34811）+ Solvent（34800） Aquastar Titrant 2（1.88011）+ Solvent（1.88015）	volumetric
Titrant 3	~3 mg/mL	General solvent	KFR-T03 / KFR-T06 (pyridine-free)	Hydranal Titrant 2（34811）+ Solvent（34800）	volumetric
Titrant 5	~5 mg/mL	General solvent	KFR-T02 / KFR-T05 (pyridine-free)	Hydranal Titrant 5（34801）+ Solvent（34800） Aquastar Titrant 5（1.88010）+ Solvent（1.88015）	volumetric
Titrant 3/5 (with pyridine)	3 / 5 mg/mL	General solvent	KFR-T08 / KFR-T09 (with pyridine)	—	With pyridine
Titrant 5 E	~5 mg/mL	Solvent E (ethanol type)	—	Hydranal Titrant 5 E（34712）+ Solvent E (low-toxicity ethanol type)	Low toxicity recommended
—	—	Oil-specific solvent	KFR-T02A / KFR-T03A solvent	Hydranal Solvent Oil（34749）/ Solvent CM	Oil-specific

One-Component vs Two-Component: How to Choose?
One-component:One bottle serves as both titrant and solvent — simple to operate, suitable for routine rapid testing with small sample volumes
Two-component:Titrant and solvent are separate — higher titration efficiency, more stable titer and longer shelf life, suitable for large sample batches or high-precision requirements

Step 3: Coulometric Reagent Selection (WKT-A Series)

Coulometric reagents are selected based on the electrolytic cell type (with/without diaphragm) and sample type. The WKT-A series coulometric moisture analyzers support both diaphragm and diaphragm-free electrolytic cells.The first choice is the Saifurui SFR coulometric series reagents; for imports, Honeywell and Merck are preferred.

★ VICOMETER Standard Reagent Shipped with Instrument (Coulometric)

KFR-C02(Pyridine-free · universal anode/cathode · 1.5gH₂O/100mL) — the standard reagent shipped free with VicoMeter WKT-A series coulometric moisture analyzers.
Extremely Wide Application Range: Universal for diaphragm cells, covering routine sample testing in most industries such as pharmaceuticals, chemicals, petroleum, food and electronics.
Also Suitable for Karl Fischer Ovens: Used with a Karl Fischer oven, it can measure the moisture of insoluble samples such as solids and plastics.
Ready to Use Out of the Box: Start testing without additional purchases — the first-choice general reagent for trace moisture analysis.

3.1 Diaphragm Electrolytic Cell (WKT-A Series with Diaphragm)

A diaphragm electrolytic cell requires separateAnolyteandCatholyte; the diaphragm separates the anode and cathode compartments, making it suitable for trace moisture determination with higher accuracy requirements.

Reagent Type	First choice: Saifurui SFR	Preferred imports: Honeywell / Merck	Applicable Samples
Anolyte (general)	KFR-C02(pyridine-free, 1.5g/100ml)Standard with instrument KFR-C06 (pyridine-free, 1.5g/100ml) KFR-C03 (pyridine-free, 1.5g/100ml)	Hydranal Coulomat A（34807） Aquastar CombiCoulomat（1.09255） AQUAMICRON AX（604-07485）/ AXI（621-01755）	Organic solvents, inorganic substances, gases; suitable for most industries
Catholyte (general)	KFR-C06 Catholyte (5mL×10 vials/box)	Hydranal Coulomat CG（34840） AQUAMICRON CXU（602-07501）	For use with general anolyte
Anolyte (for aldehydes and ketones)	KFR-C04 (pyridine-free, 1.0g/100ml) KFR-C12 (alcohol-ether type, 1.0g/100ml) KFR-C18 (alcohol-free, chloroform-free, for aldehydes and ketones)	Hydranal Coulomat AK（34820） Aquastar Anolyte K（1.09255） AQUAMICRON AKX（605-07591）	Ketones, aldehydes, silicone oils, lower carboxylic acids
Catholyte (for aldehydes and ketones)	KFR-C04 Catholyte (5mL×10 vials/box)	Hydranal Coulomat CG-K（34821） Aquastar Catholyte K	For use with aldehyde/ketone anolyte
For lithium batteries/electrolytes	KFR-C07 (pyridine-free, 1.2g/100ml) KFR-C09 (with pyridine, 1.0g/100ml) KFR-C10 (for boron salts) KFR-C11 (for additives) KFR-C16 (diol type)	Hydranal Coulomat E（34808）/ ADG（34809） HYDRANAL NEXTGEN A-FA + C-FA	Lithium battery electrolytes, VC, FEC, lithium salts, additives
Universal anode/cathode type	KFR-C01 (with pyridine, 1.0g/100ml) KFR-C08 (pyridine-free, 1.2g/100ml, universal with/without diaphragm)	Hydranal Coulomat A（34807）+ CG（34840） (mixed anode/catholyte type)	General samples, replacing imported reagents

3.2 Diaphragm-Free Electrolytic Cell (WKT-A Series Diaphragm-Free)

A diaphragm-free electrolytic cell requires onlyone electrolyte— simpler to operate with no catholyte replacement, ideal for routine high-frequency testing.

Reagent Type	First choice: Saifurui SFR	Preferred imports: Honeywell / Merck	Remarks
General electrolyte (single solution)	KFR-C03 (pyridine-free, 1.5g/100ml, chlorinated-hydrocarbon-free) KFR-C08 (pyridine-free, 1.2g/100ml, universal with/without diaphragm) KFR-C20 (pyridine-free, same as 34836, universal anode/cathode)	Hydranal Coulomat AG（34836） Aquastar CombiCoulomat Fritless（1.09257） AQUAMICRON FLS（632-07065）	One reagent is enough; no catholyte needed
For Karl Fischer ovens	KFR-C02Standard with instrument · suitable for Karl Fischer ovens KFR-C19 (carbonate/glycolamine type, extremely low volatility)	—	KFR-C02 general type is also suitable for Karl Fischer ovens; routine solid samples can directly use the standard reagent; KFR-C19 is the extremely-low-volatility type, ideal for scenarios with extremely strict drift requirements

With vs Without Diaphragm: How to Choose?
With diaphragm:Higher accuracy and less interference, suitable for demanding QC and R&D scenarios
Without diaphragm:Simple operation and low maintenance cost, suitable for rapid screening of large numbers of routine samples
VICOMETER recommends diaphragm electrolytic cells for trace moisture analysis (<100ppm).

Complete Model Catalog of Tianjin Saifurui SFR Reagents

The following is a complete list of Karl Fischer reagent models from Tianjin Saifurui Technology Co., Ltd. (brand SFR) — the first-choice recommended reagents for VICOMETER moisture analyzers.

Saifurui SFR Advantages:Three independent production lines (pyridine-free volumetric / pyridine-containing volumetric / coulometric) to avoid cross-contamination; annual output of 600,000 liters with a full range (volumetric, coulometric, aldehyde/ketone-specific); flexible packaging, high quality at low prices, replacing imported reagents. Compatible with Mettler, Metrohm, KCM, Mitsubishi and domestic moisture analyzers.

4.1 Volumetric — One-Component Reagents

Model	Type	Titer F	Package Size	Application Notes
KFR-15	Pyridine-free	≥0.5 mgH₂O/mL	500mL / 1L	Low titer, for samples with extremely low moisture
KFR-1	Pyridine-free	≥1 mgH₂O/mL	500mL / 1L	Low-moisture samples, dry solids, pure solvents
KFR-2	Pyridine-free	≥2 mgH₂O/mL	500mL / 1L	Medium moisture, chemicals, APIs
KFR-03Standard with instrument	Pyridine-free	≥3 mgH₂O/mL	500mL / 1L	Medium-to-high moisture, general chemicals.VICOMETER WKT-C series factory standard, suitable for routine samples in most industries
KFR-05	Pyridine-free	≥5 mgH₂O/mL	500mL / 1L	High moisture, food, aqueous solutions, slurries
KFR-06	Methanol type	≥3 mgH₂O/mL	500mL / 1L	Methanol system, suitable for general samples
KFR-08	With pyridine	≥3 mgH₂O/mL	500mL / 1L	Traditional pyridine-containing formula, high reactivity
KFR-09	With pyridine	≥5 mgH₂O/mL	500mL / 1L	Traditional pyridine-containing formula, high-moisture samples
KFR-04	Pyridine-free · for aldehydes and ketones	≥5 mgH₂O/mL	500mL / 1L	For aldehyde and ketone samples, avoiding acetalization reactions
KFR-10	With pyridine · for aldehydes and ketones	≥3 mgH₂O/mL	500mL / 1L	With pyridine, for aldehydes and ketones

4.2 Volumetric — Two-Component Reagents (A: Solvent + B: Titrant)

Model	Type	Titer F	Package Size	Application Notes
KFR-T1	Pyridine-free	≥1 mgH₂O/mL	A:500mL/1L B:500mL/1L	Low-moisture two-component
KFR-T2	Pyridine-free	≥2 mgH₂O/mL	A:500mL/1L B:500mL/1L	Medium-moisture two-component
KFR-T03	Pyridine-free	≥3 mgH₂O/mL	A:500mL/1L B:500mL/1L	Medium-to-high-moisture two-component
KFR-T06	Pyridine-free	≥3 mgH₂O/mL	A:500mL/1L B:500mL/1L	Medium-to-high-moisture two-component
KFR-T02	Pyridine-free	≥5 mgH₂O/mL	A:500mL/1L B:500mL/1L	High-moisture two-component
KFR-T05	Pyridine-free	≥5 mgH₂O/mL	A:500mL/1L B:500mL/1L	High-moisture two-component
KFR-T08	With pyridine	≥3 mgH₂O/mL	A:500mL/1L B:500mL/1L	Pyridine-containing two-component
KFR-T09	With pyridine	≥5 mgH₂O/mL	A:500mL/1L B:500mL/1L	Pyridine-containing two-component (high titer)
KFR-T04A/T04B	Pyridine-free · for aldehydes and ketones	1~5 mgH₂O/mL	500mL / 1L	Aldehyde/ketone-specific solvent + titrant combination
KFR-T02A / KFR-T03A	Pyridine-free · solvent	—	500mL / 1L	Routine volumetric solvent, used with titrant
KFR-12 / KFR-13	Solutions A and B	3~5 mgH₂O/mL	A: 500mL/1L B: 500mL/1L	Solution A is an iodine-methanol solution (titrant); Solution B is a sulfur dioxide-methanol solution (solvent)

4.3 Coulometric Reagents

Model	Type	Nominal Moisture Content	Package Size	Electrolytic Cell/Application
KFR-C01	With pyridine · universal anode/cathode	1.0 gH₂O/100mL	500mL / 250mL	Universal for diaphragm cells; requires water equilibration before first use
KFR-C02Standard with instrument	Pyridine-free · universal anode/cathode	1.5 gH₂O/100mL	500mL	Universal for diaphragm cells.VICOMETER WKT-A series factory standard, suitable for most industries and samples, and also for Karl Fischer ovens
KFR-C03	Pyridine-free · chlorinated-hydrocarbon-free	1.5 gH₂O/100mL	500mL	Universal with/without diaphragm, eco-friendly and chlorine-free
KFR-C04	Pyridine-free · for aldehydes and ketones	1.0 gH₂O/100mL	Anolyte: 500mL Catholyte: 5mL×10 vials	Measures aldehydes and ketones with diaphragm; use with matching catholyte
KFR-C06	Pyridine-free · with diaphragm	1.5 gH₂O/100mL	Anolyte: 500mL Catholyte: 5mL×10 vials	Universal for diaphragm cells; use with matching catholyte
KFR-C07	Pyridine-free · for lithium batteries	1.2 gH₂O/100mL	500mL	Testing of lithium battery additives and electrolytes; no water equilibration required
KFR-C08	Pyridine-free · universal with/without diaphragm	1.2 gH₂O/100mL	Anolyte: 500mL Catholyte: 5mL×10 vials	Replaces imported reagents; quickly reaches stable drift on first use
KFR-C09	With pyridine · electrolyte-specific	1.0 gH₂O/100mL	500mL	Testing of electrolytes containing VC, FEC, lithium salts, etc.; fast reaction and long life
KFR-C10	Pyridine-free · for boron salts	1.0 gH₂O/100mL	500mL	Testing of pure LiBOB, ODFB and other boron salts; universal anode/cathode with diaphragm
KFR-C11	Pyridine-free · for additives	1.0 gH₂O/100mL	500mL	Testing of VC, FEC, DTD and other additives; universal anode/cathode with diaphragm
KFR-C12	Alcohol-ether type	1.0 gH₂O/100mL	500mL	Minimal side reactions with aldehyde/ketone samples; suitable for VC/FEC/NMP/acetone, etc.
KFR-C16	Diol · diaphragm-specific	—	500mL	Lithium salts/FEC/VC-containing electrolytes; good solubility, no crystallization
KFR-C18	Alcohol-free, chloroform-free · for aldehydes and ketones	1.0 gH₂O/100mL	500mL	VC/FEC/NMP/acetone/cyclohexanone/vinyl ethers; minimal side reactions
KFR-C19	Carbonate/glycolamine · for Karl Fischer ovens	—	500mL	For Karl Fischer ovens; extremely low volatility, stable drift, universal with/without diaphragm
KFR-C20	Pyridine-free · universal anode/cathode	1.5 gH₂O/100mL	500mL	Replaces imported reagents (same as 34836); universal with/without diaphragm and for anolyte/catholyte

4.4 Water Standards

Model	Nominal Moisture Content Value	Package Size	Application
KFR-W01	0.1 mg/g（0.01%）	5mL×10 vials	Coulometric accuracy verification
KFR-W02	1.0 mg/g（0.1%）	5mL×10 vials	Coulometric accuracy verification
KFR-W03	10.0 mg/g（1.0%）	5mL×10 vials	Volumetric titer calibration

Cross-Reference Table of Saifurui Models and Other Brand Reagents

The table below lists the corresponding models of imported brands (Honeywell HYDRANAL, Merck Aquastar, Mitsubishi AQUAMICRON) and the domestic brand (Sinopharm Hushi) that each Saifurui SFR reagent can replace, making it easy for customers to choose flexibly according to their purchasing channels.

Replacement Principle:Reagents with the same titer and type (one-component/two-component, with/without diaphragm, general/aldehyde-ketone-specific) are in principle interchangeable. When changing brands, calibration verification is recommended first; confirm result consistency before batch use.

5.1 Volumetric One-Component Reagent Comparison

Saifurui SFR (part number = model)	Titer / Type	Honeywell HYDRANAL (order no.)	Merck Aquastar (product no.)	Mitsubishi AQUAMICRON (part no.)	Sinopharm Hushi (part number = model)
KFR-15	0.5 / pyridine-free	Composite 1 Part No.: 34827	CombiTitrant 1 No.: 1.88001	SS-Z 1mg Part No.: 631-03495	—
KFR-1	1 / pyridine-free	Composite 1 Part No.: 34827	CombiTitrant 1 No.: 1.88001	SS-Z 1mg Part No.: 631-03495	KFR-1 Pyridine-Free
KFR-2	2 / pyridine-free	Composite 2 Part No.: 34806	CombiTitrant 2 No.: 1.88002	SS-Z 3mg Part No.: 634-03505	KFR-2 Pyridine-Free
KFR-03Standard with instrument	3 / pyridine-free	Composite 2 Part No.: 34806	CombiTitrant 2 No.: 1.88002	SS-Z 3mg Part No.: 634-03505	KFR-3 Pyridine-Free
KFR-05	5 / pyridine-free	Composite 5 Part No.: 34805	CombiTitrant 5 No.: 1.88005	SS-Z 5mg Part No.: 631-03515	KFR-5 Pyridine-Free
KFR-06	3 / methanol type	Composite 2 Part No.: 34806	CombiTitrant 2 No.: 1.88002	—	KFR-3 Methanol Type
KFR-08	3 / with pyridine	Composite 2 (with pyridine)	—	SS 3mg (with pyridine) Part No.: 601-07015	KFR-8 With Pyridine
KFR-09	5 / with pyridine	Composite 5 (with pyridine)	—	SS 10mg (with pyridine) Part No.: 603-07215	KFR-9 With Pyridine
KFR-04	5 / for aldehydes and ketones	Composite 5K Part No.: 34816	CombiTitrant 5 Keto No.: 1.88006	SS-Z 5mg + KTX Part No.: 631-03515 / 632-03545	For aldehydes and ketones

5.2 Volumetric Two-Component Reagent Comparison

Saifurui SFR (part number = model)	Titer / Type	Honeywell HYDRANAL (order no.)	Merck Aquastar (product no.)	Mitsubishi AQUAMICRON (part no.)
KFR-T1	1 / pyridine-free	—	Titrant 1 + Solvent	—
KFR-T2	2 / pyridine-free	Titrant 2 + Solvent Part No.: 34811 + 34800	Titrant 2 + Solvent No.: 1.88011 + 1.88015	SS-Z 3mg + GEX Part No.: 634-03505 + 608-07525
KFR-T03 / T06	3 / pyridine-free	Titrant 2 + Solvent Part No.: 34811 + 34800	Titrant 2 + Solvent No.: 1.88011 + 1.88015	SS-Z 3mg + GEX Part No.: 634-03505 + 608-07525
KFR-T02 / T05	5 / pyridine-free	Titrant 5 + Solvent Part No.: 34801 + 34800	Titrant 5 + Solvent No.: 1.88010 + 1.88015	SS-Z 5mg + GEX Part No.: 631-03515 + 608-07525
KFR-T08	3 / with pyridine	—	—	—
KFR-T09	5 / with pyridine	—	—	—
KFR-T04A/T04B	Two-component for aldehydes and ketones	Titrant 5 + Solvent K Part No.: 34801 + 34738	Titrant 5 + Solvent Keto No.: 1.88010 + 1.88007	SS-Z 5mg + KTX Part No.: 631-03515 + 632-03545
KFR-T02A / T03A	General solvent	Solvent / Solvent Oil Part No.: 34800 / 34749	Solvent / Solvent Oil No.: 1.88015 / 1.88020	GEX / OLX Part No.: 608-07525 / 635-03535

5.3 Coulometric Reagent Comparison

Saifurui SFR (part number = model)	Type / Application	Honeywell HYDRANAL (order no.)	Merck Aquastar (product no.)	Mitsubishi AQUAMICRON (part no.)	Sinopharm Hushi (part number = model)
KFR-C01	With pyridine · universal for diaphragm cells	Coulomat A + CG Part No.: 34807 + 34840	CombiCoulomat frit No.: 1.09255	AX + CXU Part No.: 604-07485 + 602-07501	Pyridine-containing coulometric electrolyte
KFR-C02Standard with instrument KFR-C03	Pyridine-free · universal with/without diaphragm	Coulomat A / AG Part No.: 34807 / 34836	CombiCoulomat frit / Fritless No.: 1.09255 / 1.09257	AXI / FLS Part No.: 621-01755 / 632-07065	Pyridine-free coulometric electrolyte
KFR-C06	Pyridine-free · universal for diaphragm cells	Coulomat A (anolyte) Part No.: 34807 Coulomat CG (catholyte) Part No.: 34840	CombiCoulomat frit No.: 1.09255	AX (anolyte) Part No.: 604-07485 CXU (catholyte) Part No.: 602-07501	Pyridine-free anolyte/catholyte
KFR-C04	Pyridine-free · for aldehydes and ketones	Coulomat AK + CG-K Part No.: 34820 + 34821	CombiCoulomat frit (for aldehydes and ketones) No.: 1.09255	AKX + CXU Part No.: 605-07591 + 602-07501	Electrolyte for aldehydes and ketones
KFR-C08	Pyridine-free · universal with/without diaphragm	Coulomat AG Part No.: 34836	CombiCoulomat Fritless No.: 1.09257	FLS Part No.: 632-07065	Diaphragm-free electrolyte
KFR-C20	Pyridine-Free · Universal for Anode & Cathode (Same as 34836)	Coulomat AG Part No.: 34836	CombiCoulomat Fritless No.: 1.09257	FLS Part No.: 632-07065	Universal Electrolyte
KFR-C07	For lithium batteries/electrolytes	Coulomat E / ADG Cat. No.: 34808 / 34809	—	—	—
KFR-C09	With pyridine · electrolyte-specific	NEXTGEN Coulomat A-FA	—	—	—
KFR-C12	For Alcohols/Ethers · Aldehydes & Ketones	Coulomat AK Cat. No.: 34820	CombiCoulomat frit No.: 1.09255	AKX Cat. No.: 605-07591	—
KFR-C18	Alcohol-free, chloroform-free · for aldehydes and ketones	Coulomat AK Cat. No.: 34820	—	—	—
KFR-C16	Diols · Lithium Battery (With Diaphragm)	Coulomat ADG Cat. No.: 34809	—	—	—
KFR-C19	For Karl Fischer ovens	—	—	—	—

5.4 Comparison of Water Standards

Saifurui SFR (part number = model)	Nominal Moisture Content Value	Honeywell HYDRANAL (order no.)	Merck Aquastar (product no.)	Mitsubishi AQUAMICRON (part no.)	Application
KFR-W01	0.1 mg/g（0.01%）	Water Std 0.1 Cat. No.: 34847	Water Std 0.01% Article No.: 1.88050	Water Std 0.1mg Cat. No.: 639-15101	Coulometric Verification
KFR-W02	1.0 mg/g（0.1%）	Water Std 1.0 Cat. No.: 34828	Water Std 0.1% Article No.: 1.88051	Water Std 1mg Cat. No.: 601-07571	Coulometric Verification
KFR-W03	10.0 mg/g（1.0%）	Water Std 10.0 Cat. No.: 34850	Water Std 1.0% Article No.: 1.88052	Water Std 10mg Cat. No.: 608-07581	Volumetric Titer Standardization

Step 6: Quick Selection by Industry/Sample Type

Quickly match the recommended method and Saifurui/imported reagent combination based on your actual sample type.

Pharmaceuticals / APIs

Tablets, capsules, APIs, excipients

Standard: KFR-C02（coulometric）
Standard: KFR-03（volumetric）

Imported: Coulomat A (34807) / Composite 2 (34806)

Chemicals / Organic Solvents

Alcohols, esters, ethers, amines

Standard: KFR-C02（coulometric）
Standard: KFR-03（volumetric）

Imported: Coulomat AG (34836) / Composite 2 (34806)

Petroleum / Oils

Gasoline, diesel, lubricating oil, insulating oil

Standard: KFR-C02（coulometric）
Standard: KFR-03 + KFR-T02A Solvent

Imported: Coulomat A (34807) / Solvent Oil (34749)

Food / Beverages

Oils & fats, milk powder, seasonings, alcoholic drinks

Standard: KFR-C02（coulometric）
Standard: KFR-03（volumetric）

Imported: Coulomat A (34807) / Composite 2 (34806)

Aldehydes & Ketones

Acetone, formaldehyde, acetaldehyde, etc.

Dedicated: KFR-04 (Volumetric)
KFR-C04/C12（coulometric）

Imported: Composite 5K (34816) / Coulomat AK (34820)

Electronics / Semiconductors

Electronic-grade solvents, photoresists

Standard: KFR-C02（coulometric）
ppm-Level Accuracy

Imported: Coulomat AG (34836)

New Energy / Lithium Batteries

Electrolytes, cathode & anode materials

Dedicated: KFR-C07/C09 (Coulometric)
Dedicated for Lithium Battery Electrolytes

Imported: NEXTGEN A-FA / Coulomat E (34808)

Gas Analysis

Natural gas, LPG, inert gases

Standard: KFR-C02（coulometric）
+ Gas Sampling Unit

Imported: Coulomat A (34807)

Plastics / Polymers

Pellets, resins, films

Standard: KFR-C02(Coulometric + Karl Fischer Oven)
Standard: KFR-03(Volumetric + Karl Fischer Oven)

Imported: Coulomat A (34807) / Composite 2 (34806)

Step 7: Reagent Brand Compatibility Reference

VICOMETER WKT series moisture analyzers are compatible with mainstream Karl Fischer reagent brands. Saifurui SFR is our first choice; for imported reagents, Honeywell HYDRANAL and Merck Aquastar are recommended.

Brand	Series	Origin	Recommended Volumetric Models	Recommended Coulometric Models	Positioning
Tianjin Saifurui SFR	SFR / Saifurui	Tianjin, China	KFR-03Standard / KFR-02/05 (Pyridine-Free) KFR-08/09 (With Pyridine) KFR-04 (For Aldehydes & Ketones) KFR-T Series (Two-Component)	KFR-C02Standard / C03/C06/C08 KFR-C04 (Aldehydes & Ketones) KFR-C07/C09 (Lithium Batteries) KFR-C12/C18 (Aldehydes, Ketones, Alcohols & Ethers) KFR-C20 (Universal Import Substitute)	First Choice
Honeywell	HYDRANAL®	Germany	Composite 1/2/5/5K Cat. No.: 34827/34806/34805/34816 Titrant 2/5 + Solvent Cat. No.: 34811/34801 + 34800	Coulomat A/AG/CG/AK Cat. No.: 34807/34836/34840/34820 NEXTGEN A-FA/C-FA	Preferred Import
Merck	Aquastar®	Germany	CombiTitrant 1/2/5/5K Article No.: 1.88001/1.88002/1.88005/1.88006 Titrant 2/5 + Solvent Article No.: 1.88011/1.88010 + 1.88015	CombiCoulomat frit (With Diaphragm) No.: 1.09255 CombiCoulomat Fritless (Without Diaphragm) No.: 1.09257	Preferred Import
Mitsubishi Chemical	AQUAMICRON®	Japan	SS-Z 1mg/3mg/5mg Cat. No.: 631-03495/634-03505/631-03515 GEX/OLX/KTX/SU Solvents Cat. No.: 608-07525/635-03535/632-03545/603-07335	AX(604-07485)/AXI(621-01755) AS(601-07255)/AKX(605-07591) CXU(602-07501)/FLS(632-07065)	Premium Import
Sinopharm Hushi	Sinopharm	China	With/Without Pyridine Types For aldehydes and ketones	Electrolytes With/Without Pyridine	Domestic Option
Aladdin / Macklin	Aladdin / Macklin	China	Pyridine-Free Volumetric Reagents	—	Domestic Option

Safety Upgrade Recommendation:Honeywell HYDRANAL NEXTGEN series contains no imidazole or other CMR (carcinogenic, mutagenic, reprotoxic) substances, making it a safe alternative to traditional reagents. It is a direct drop-in replacement requiring no change to titration methods. Pharmaceutical and electronics customers with safety requirements are advised to choose it first.

Water Standards & Standardization

Whether using volumetric or coulometric methods, regular standardization and verification with water standards is essential to ensure accurate results.

Water Standard Type	Nominal Moisture Content Value	Applicable Method	Application	First Choice: Saifurui	Preferred Import
Liquid Water Standard 0.01%	0.1 mg/g	coulometric	Coulometric accuracy verification	KFR-W01	Hydranal Water Std 0.1 Cat. No.: 34847 Aquastar Article No.: 1.88050
Liquid Water Standard 0.1%	1.0 mg/g	coulometric	Coulometric accuracy verification	KFR-W02	Hydranal Water Std 1.0 Cat. No.: 34828 Aquastar Article No.: 1.88051
Liquid Water Standard 1.0%	10.0 mg/g	volumetric	Volumetric titer calibration	KFR-W03	Hydranal Water Std 10.0 Cat. No.: 34850 Aquastar Article No.: 1.88052
Solid Water Standard 1%	1.0%	Volumetric / Karl Fischer Oven	Karl Fischer Oven Verification	—	Hydranal Water Std KF-Oven Cat. No.: 34748 Aquastar Article No.: 1.88054

Recommended Standardization Frequency:
- Re-standardize whenever a new reagent batch is used (volumetric)
- Verify instrument status with a water standard before first use each day
- During continuous high-volume testing, verify every 8 hours
- Although coulometric titration requires no titer standardization, accuracy should still be verified regularly with water standards

FAQ & Precautions

Issue/Scenario	Cause Analysis	Solutions
High results for aldehyde/ketone samples	Aldehydes/ketones undergo acetalization with methanol, generating water and causing positive bias	Use aldehyde/ketone-specific reagents: Saifurui KFR-04 / KFR-C04 / KFR-C12; imported Hydranal Composite 5K / Coulomat AK
Poor dissolution of oil samples	Oils have low solubility in methanol, forming two phases	Use oil-specific solvents: Saifurui KFR-T02A/T03A; imported Solvent Oil / OLX, or add chloroform as a co-solvent
Strong acid/base samples out of pH range	Optimal pH for Karl Fischer reaction is 5-7; outside this range the reaction slows or becomes incomplete	Add buffer to adjust pH, or dilute before measurement
Large endpoint drift in coulometric titration	Aged electrolyte, contaminated diaphragm, ambient moisture ingress	Replace the electrolyte; check seals; keep the environment dry (recommended humidity <60%)
Unstable volumetric titer	Reagent moisture absorption, improper storage, leaks in the burette system	Store reagents tightly sealed and avoid frequent opening; check burette joint seals; standardize regularly
Solid samples cannot be measured directly	Sample insoluble in reagent; water cannot be released	Use a Karl Fischer oven: heat the sample to release water, which is carried into the titration cell by a carrier gas.The standard KFR-C02 universal electrolyte is also suitable for Karl Fischer ovens; conventional solid samples can be used directly. For extremely low volatility requirements, choose Saifurui KFR-C19 oven-dedicated electrolyte
Abnormal results for lithium battery electrolytes	VC, FEC, lithium salts and other components react side-wise with methanol	Use Saifurui KFR-C07/C09/C10/C11 lithium battery electrolytes; NEXTGEN A-FA is the imported option
Reagent color darkens	Iodine has been oxidized and released; the reagent may have expired	Replace the reagent immediately; check storage conditions (protect from light, keep cool and sealed)

General Reagent Storage Principles:
- Storage temperature: 2~8°C in a cool place (some can be stored at room temperature; see the instructions)
- Protect from light; avoid direct sunlight
- Use promptly after opening; volumetric reagents should be used within 1 month of opening
- Coulometric electrolytes should be used within 3 months of opening
- Pyridine-containing reagents must be managed as hazardous materials; ensure ventilation and protection
- Shelf life: Saifurui reagents have a 12-month shelf life (sealed in original packaging)

Selection Decision Flow Summary

One-page quick decision: the complete path from sample to reagent.

Step 1: Water Content	Step 2: Sample Type	Step 3: Cell Type	Step 4: First Choice Saifurui	Step 4: Preferred Import
> 0.1% volumetric WKT-C Series	General Samples	—	KFR-03Standard KFR-05 (High Water Content) KFR-T05 + T02A (Two-Component)	Composite 2（34806）/ Titrant 5（34801）+ Solvent（34800）
	Aldehydes & Ketones	—	KFR-04 (One-Component) KFR-T04A + T04B (Two-Component)	Composite 5K（34816）/ Titrant 5（34801）+ Solvent K（34738）
	Oils	—	KFR-T05 + KFR-T02A Solvent	Titrant 5（34801）+ Solvent Oil（34749）
< 0.1% coulometric WKT-A Series	General Samples	With Diaphragm	KFR-C02Standard KFR-C06 (Anolyte) + Catholyte	Coulomat A（34807）+ CG（34840）
	General Samples	Without Diaphragm	KFR-C08 / KFR-C20	Coulomat AG（34836）
	Solids/Plastics (Karl Fischer Oven)	With/Without Diaphragm	KFR-C02Standard · Suitable for Karl Fischer Oven KFR-C19 (For Extremely Low Volatility)	Coulomat A（34807）
	Aldehydes & Ketones	With Diaphragm	KFR-C04 (Anolyte) + KFR-C04 Catholyte	Coulomat AK（34820）+ CG-K（34821）
	Lithium Batteries/Electrolytes	With Diaphragm	KFR-C07 / KFR-C09	NEXTGEN Coulomat A-FA + C-FA

Selection Tip:VICOMETER WKT series moisture analyzers ship with standard reagents — coulometric KFR-C02、volumetric KFR-03, suitable for most industries and general samples — ready to use out of the box. The standard KFR-C02 is also suitable for Karl Fischer ovens. If you have any questions about reagent selection, please call the VICOMETER technical hotline; we will provide professional selection advice based on your specific samples and instrument model.

This selection guide is for reference by VICOMETER moisture analyzer users only; actual selection should be confirmed based on the instrument model and specific samples
Reagent catalog numbers and specifications may change with manufacturer updates; please refer to the reagent manufacturer's latest catalog before purchasing
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