Water Vapour Transmission Rate

Water Vapour Transmission Rate (WVTR) measures the ability to transport moisture through a material of specified thickness. WVTR is measured in grams per square meter (g/m2 ) over a 24 hours period according to the US standard ASTM E398 . The BioBag material used for the ventilated kitchen caddies and other applications related to food waste collection has a WVTR larger than 950 g/m2 for a film thickness of 30 micron. In comparison polyethylene has a WVTR of approximately 20 g/m2. Thinner materials will have higher WVTR.

The ability to transport moisture over a membrane can be a favourable property in a number of applications such as in food waste collection systems and garden waste sacks.

High WVTR will lead to a significant weight reduction of the waste, which reduces transport and treatment cost with about 20%.

High WVTR will improve the quality (condition) of the waste as feedstock for the composting plant, with less need for bulking material and with better microbial composition.

High WVTR in combination with our ventilated collection systems will avoid fermentation and bad smell, mould and leachate, which are important factors to help households be committed to food waste collection.

We can also supply compostable BioBags with high water barrier (comparable to Polyethylene) for applications where this is required.

 

Our BioBags used in the MaxAir food waste collection system have a WVTR up to 1900 g/m2.

Back to home page