K-4605 Formaldehyde

Dissolved Formaldehyde Testing Visual Kit

Measure formaldehyde 0-1 ppm & 1-10 ppm

Replacement ampoules for the K-4605 Test Kit can be found here.

Formaldehyde Information

2-5 Business Days

Why Choose CHEMetrics Chemets kits?

CHEMetrics Chemets self-filing reagent ampoules are a great way to test for dissolved substances in liquids. These visual test kits allow you to obtain results by measuring the color of the sample according to the color comparators provided with the kit. This unique method allows you to attain results quickly and accurately with minimal contact with potentially hazardous materials.

Safe and Reliable Results:

While traditional methods often require multiple steps and thorough preparation, these test kits allow you to obtain dependable results with a few simple steps. By simplifying the testing method, Chemets test kits reduce the potential for operator error. Additionally, each of the ampoules contained in the test kits is vacuum sealed which helps eliminate the problem of obtaining inaccurate results from stale or unstable reagents. These reagents are stored right in the tip of each ampoule and sealed in glass, thereby minimizing direct contact with the chemicals.

What's Included:

     -30 self-filling Ampoules

     -low and high-range comparators 

     -1 25 mL Sample Cup

     -Activator Solutions

     -Instruction Manual



The K-4605 CHEMets Visual Kit is a visual indicator kit for measuring formaldehyde in water levels from 0-1 and 1-10 ppm.  This device uses the Purpald Method for testing. Purpald® is subject to fewer interferences than Schiff's reagent or chromotropic acid procedures. A purple-colored complex is formed when Purpald in alkaline solution reacts with formaldehyde. Results are expressed as ppm (mg/L) CH2O.

Shelf-life of the Purpald Reagent: five months. We recommend stocking quantities that will be used within four months.


1. Fill the sample cup to the 2 mL mark with the sample to be tested. Add 6 drops of the A-4201 solution and stir. Add 4 drops of A-4202 solution and stir. 2. Place the Vacu-vial ampoule tip-first into the sample cup. Snap the tip and the ampoule will automatically fill.
3. To mix the ampoule, tilt it from side to side, allowing the bubble to travel from end to end. 4. Dry the ampoule and wait 12 minutes for color development.
5. Place the ampoule into the center of the round comparator and hold it toward a source of light, viewing from the bottom. Rotate the comparator until the color below the ampoule shows the closest match. 6. For higher concentrations, use flat comparator. Place the ampoule between the color standards, moving it along the comparator until you can determine the closest match.

For more detailed instructions, see the link at the bottom of the page.


WARNING! This product can expose you to chemicals including mercury, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.


More CHEMetrics Kits for Formaldehyde:

Chemets Kits
Product Number Method MDL Range Price
K4605 Purpald 0.1 ppm 0-1 & 1-10 ppm $70.00
Product Number Method MDL Range Price
K4605D Purpald 5 ppm 0-30 & 30-300 ppm $76.00
K4605A Purpald 10 ppm 0-60 & 60-600 ppm $71.00
K4605B Purpald 20 ppm 0-120 & 120-1200 ppm $76.00
K4605C Purpald 200 ppm 0-1200 & 1200-12,000 ppm $77.00



K-4605 Instructions

Safety Data Sheet

Purpald Tech Sheet

Formaldehyde Information


More Information
Manufacturer CHEMetrics
Call For Price No
Gas Formaldehyde (CH2O)
4-20 mA Output No
Voltage Output None
Power Requirements None
Datalogging No
Warranty 1 Year
Range 0-1 ppm & 1-10 ppm
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