| prov:value
| - Where a plasticiser is necessary it may be one of urea, a polyhydric alcohol such as glycerol, ethylene glycol, propylene glycol, hexylene glycol, certain esters of dibasic acids, eg dibutyl phthalate, di-octyl maleate, di-hexyl succinate, and of phosphoric acid, eg tri-t-butoxyethyl phosphate.
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