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Toxic waste

Letters

I was disappointed but not surprised with points made in the Down memory silane response to the article Non toxic concrete treatment trialled (NCE 1 July).

The reference to grandmother's cooking is humorous but based on misinformation. There have been a number of materials called pavix, including an asphalt rejuvenator. The product found to comply with the BD43/03 tests is called Chem Crete Pavix CCC100.

By any standard, Silane is toxic and this point should not be lost. The reader familiar with web browsers might key in 'silane+chemical warfare'. One of the many pages returned is tagged: Chemical Warfare Agents TIC's-HAZMATCAD Plus Nerve Gases Blister Agents Hydride. Gases Halogen Gases GA, GB, GD, GF, VX HD, HN3 Arsine, Diborane, Silane Chlorine. . .

I am happy to report that while Pavix CCC100 is good for concrete it regrettably would serve no useful purpose in grandmother's kitchen.

Prof Denis Chamberlain, City University, school of engineering and mathematics, Northampton Square, London, EC1 VOHB

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