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Formaldehyde Test Kits

Visual Kits

Range MDL Method Type Kit Cat. No. Refill Cat. No.
0.0 - 1.0 & 1 - 10 ppm 0.1 ppm Purpald CHEMets K-4605 R-4605
0 - 30 & 30 - 300 ppm 5 ppm Purpald VACUettes K-4605D R-4605D
0 - 60 & 60 - 600 ppm 10 ppm Purpald VACUettes K-4605A R-4605A
0 - 120 & 120 - 1,200 ppm 20 ppm Purpald VACUettes K-4605B R-4605B
0 - 1,200 & 1,200 - 12,000 ppm 200 ppm Purpald VACUettes K-4605C R-4605C

Note: Click on the ‘Kit Cat. No.’ to view the test instructions.

CHEMetrics offers test kits employing the well-known Purpald® reagent to deliver sensitivity and accuracy within two minutes or less. Based on CHEMetrics patented Self-Filling Reagent Ampoule technology. Premixed. Premeasured. Precise. Each kit contains 30 tests.

The Purpald Method

Purpald® is subject to fewer interferences than Schiff's reagent or chromotropic acid procedures. A purple-coloured 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.

Purpald® developed by Aldrich Chemical Co.


Formaldehyde, a toxic substance, is used in the following applications: metal plating baths, textile treatments, biological specimen preservatives, and disinfectants of medical equipment. Commercial formaldehyde gas is readily soluble in water.

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