GMW GMW14236 PDF

This test method describes a measuring process for determining the release of formaldehyde from moulded parts for the vehicle interior. The test method was elaborated with reference to VDA 275.

Note: Nothing in the specification supersedes applicable laws and regulations unless specific exemption has been obtained.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Principle.

For this test, pieces of a particular mass and dimension are fastened above demineralized water in a sealed 1- litre polyethylene bottle and stored at a constant temperature for a specified length of time. Afterwards, the bottles are cooled and the formaldehyde absorbed in the demineralized water is determined. The quantity of formaldehyde is ascertained as a proportion of the dry weight (μg/g) of the test piece.

The concentration of formaldehyde is determined by photometric analysis using the acetylacetone method. In an aqueous solution, formaldehyde reacts with acetylacetone in the presence of ammonium ions to become 3.5-diacetyl-1.4-dihydrolutidine (DDL). The resulting colour complex is yellow with maximum absorption at a wavelength of 412 nm.