Thermaliten.
/ˈθəːməlʌɪt/ The proprietary name of a type of cellular concrete building block with good insulating qualities.
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Thermalite1949
1949 Trade Marks Jrnl. 3 Aug. 690/1 Thermalite... Concrete products included in Class 19.
1955 Archit. Rev. 117 117/2 The construction is cavity brick walls with inner skin of thermalite blocks, with a roof of ¾ inch asphalt on rafters at 5° pitch, and 2 inch cork insulation.
1960 Times 3 Oct. (Suppl.) p. iii/2 External walls are of cavity construction with brick facing and Thermalite inner leaf.
1977 Reader's Digest Bk. of Do-It-Yourself Skills & Techniques 201/1 Aerated blocks, e.g. Celcon or Thermalite, are also easy to work and have better insulation qualities [than lightweight aggregate blocks] but are more expensive and are unsuitable for exposed garden walls.
This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2018).
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n.1949