NF T77-161

Silicones. Polydimethylsiloxanes. Determination of silanetriyl radicals (silanetriyl content less then 0,01 per cent (m/m)). Gaschromatographic method.

Cette norme s'adresse aux personnes qui sont concernées par les polydiméthylsiloxanes en tant que matières premières à l'état liquide. Elle permet de déterminer la teneur en radicaux silanetriyle (- SiH =) présents dans les silicones à analyser, par action d'un alcool à masse moléculaire relative élevée en milieu sodique sur la liaison SiH engendrant ainsi un dégagement d'hydrogène dans le réacteur qui est ensuite mesuré dans l'espace de tête par chromatographie en phase gazeuse.

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