Two procedural aspects of measuring formaldehyde release from wood panel products using the large chamber

The ASTM E 1333 large chamber test method is the primary method for determining formaldehyde emission potential from urea-formaldehyde bonded wood panel products. The precision of the large chamber air sampling and chromotropic acid analytical procedure (NIOSH Method 3500) was examined by comparing the differences between formaldehyde concentrations from simultaneous air samples taken at two sampling ports in chambers operated by two laboratories. Based on this approach, a precision of the analytical procedure was indicated at least as low as 0.003 ppm in the 0.020 to 0.300 ppm range of air concentrations, a range defining most low-formaldehyde-emitting wood panel products. Differences between two air exchange rate measuring techniques were compared: totalizing gas meter and carbon monoxide tracer gas. Good agreement among the two air exchange rate measuring techniques was demonstrated.

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