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ISO 15038:1999
M00008697
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ISO 15038:1999 Plastics -- Organic-perester crosslinking agents for unsaturated-polyester thermosetting materials -- Determination of active-oxygen content
standard by International Organization for Standardization, 06/01/1999
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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.