Test Background
Rigid foam plastics refer to foam plastics that have no flexibility, high compression hardness, can deform when the stress reaches a certain value, and cannot return to their original shape after the stress is relieved. They can be used as thermal insulation materials, sandwich materials, packaging materials, sound insulation and earthquake-proof materials, building materials, etc. The water vapor transmission performance test of rigid foam plastics can measure the water vapor transmission amount, water vapor transmission rate, water vapor transmission coefficient and water vapor diffusion resistance index of rigid foam plastics.
Zhongke Testing Reliability Experiment Center has the capability of reliability testing of various rigid foam plastics and provides professional water vapor transmission performance testing services for rigid foam plastics.
Scope of tests
Rigid foam plastics mainly include: polystyrene foam, phenolic foam, polycarbonate foam, epoxy foam, rigid polyvinyl chloride, most polyolefin foams and some polyurethane foams.
Test method
Seal the sample on a test vessel filled with desiccant and open at the top, then place the entire test device in an environment with controlled temperature and humidity, and weigh it regularly to measure the amount of water vapor passing through the sample and entering the desiccant. This test specifies three different temperature and humidity conditions:
a) 38℃, humidity gradient 0% ~ 88%;
b) 23℃, humidity gradient 0%~85%;
c) 23℃, humidity gradient is 0%~50%.
Test standard:
GB/T 21332-2008 Rigid foam plastics - Determination of water vapor transmission performance
ISO 1663: 1999 Determination of water vapor transmission properties of rigid foam plastics
GB/T 2918-1998 Standard environment for conditioning and testing of plastic specimens
GB/T 6342-1996 Foam plastics and rubber Determination of linear dimensions
ISO 483: 2005 Plastics - Method for constant relative humidity values of aqueous solutions in water-sealed containers
