Crossword Genius

Heat-resistant glass brand introduced in 1915 (5)

Ross

I believe the answer is:

pyrex

(Other definitions for pyrex that I've seen before include "Heat-resistant glass" , "Heat-proof ovenware" , "Heatproof glass" , "Heat-resistant glassware used in cooking" .)

I've seen this clue in The Times and The Sunday Times.
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