Last edited 25 May 2018

Thermoplastic materials in buildings

Approved document B, Fire Safety, Volume 1 Dwelling houses, defines a thermoplastic material as:

…any synthetic polymeric material which has a softening point below 200ºC if tested to BS EN ISO 306:2004 method A120 PlasticsThermoplastic materialsDetermination of Vicat softening temperature (VST). Specimens for this test may be fabricated from the original polymer where the thickness of material of the end product is less than 2.5 mm

NB: BS EN ISO 306:2004 has been withdrawn and replaced by BS EN ISO 306:2013 since the 2006 edition of the approved document was published.