ISO 15038:1999

Current Revision
Plastics -- Organic-perester crosslinking agents for unsaturated-polyester thermosetting materials -- Determination of active-oxygen content

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ISO 15038:1999

Plastics -- Organic-perester crosslinking agents for unsaturated-polyester thermosetting materials -- Determination of active-oxygen content

PUBLISH DATE 1999
ISO 15038:1999

This International Standard specifies a method of determining the total active-oxygen content of organic peresters.

It applies to those peresters used to initiate crosslinking of unsaturated-polyester thermosets.

The peresters most widely used in the crosslinking of unsaturated-polyester resins are given in Table 1.

Table 1 - Main types of organic perester
Perester Molecular mass
tert-Butyl perbenzoate 194,2
tert-Butyl 2-ethylperhexanoate 216,3
iso-Propyl tert-butylperoxy carbonate 176,2
tert-Amyl 2-ethylperhexanoate 230,3
tert-Amyl perbenzoate 208,3
tert-Butyl 3,5,5-trimethylperhexanoate 230,4

Butyl peresters may contain traces of tert-butyl hydroperoxide (TBHP), the active oxygen in which can be determined separately from that in the perester itself (see annex A).

The active-oxygen content of the perester alone can then be obtained by subtraction.

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