Last edited 11 Apr 2019

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NB: BS EN ISO 306:2004 has been withdrawn and replaced by BS EN ISO 306:2013 since the 2006 edition of the approved document was published.

The term ‘acrylic’ refers to chemicals that contain the acryloyl group, derived from acrylic acid, such as polyacrylonitrile and poly(methyl methacrylate) (PMMA).

Acrylics generally have good optical clarity, scratch resistance, dimensional stability and rigidity. They are do not deteriorate in sunlight and they have good adhesion, are thermoplastic, easy to form and cut into a variety of shapes. However, they are combustible, are not flexible, suffer from stress cracking and are not resistant to solvents.

Acrylics have a very wide range of uses in the construction industry:

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