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GB/T 12008.3-1989 English PDF (GBT12008.3-1989)

GB/T 12008.3-1989 English PDF (GBT12008.3-1989)

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Newer version: (Replacing this standard) GB/T 12008.3-2009
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GB/T 12008.3-1989: Palyether polyols--Determination of hydroxyl number
This standard specifies the method for determining the hydroxyl number of polyether polyols by the phthalic anhydride esterification method. This standard applies to the determination of the hydroxyl number of polyether polyols for polyurethane foams which are made by the ring-opening polymerization of polyols, ethylene oxide and propylene oxide under the action of a catalyst.

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