Peroxy VA

Initiator-VA

Product description

　 Butyl 4,4-di(tert-butylperoxy) valerate

Molecular weight : 334.5
　 Theoretical active Oxygen content : 9.57%
　 CAS No. : 995-33-5

Specification

　 Appearance : off-white masterbatch slab
　 Assay : 40.0±1.0% min.

Characteristics

　 Density, 20℃ : 1100 kg/m³

Half life data

The most important characteristic of a cross-linking peroxide is its hdecomposition rate expressed by its half life (t) at various temperatures.
　 For VA in a EPDM compound:
　 t= 0.1 hr 　　　　　 1 hr 　　　　　 10 hr
　 at 152℃ 　　　　 130℃ 　　　　 104℃

Storage

VA Ts max. = 30℃

Major decomposition products

Methane, Carbon dioxide, Acetone, tert-Butanol, n-Butyl propionate, n-Butyl levulinate.

Safety and handling

Keep away from open fire, sparks and other sources of heat or ignition.
Avoid contact with reducing agents (e.g. amines), acids, alkalis and heavy metal compounds(e.g. accelerators, driers and metal soaps).
Please refer to the Materials Safety Data Sheet (MSDS) for further information on the safe storage, use and handling of VA. This information should be thoroughly reviewed prior to acceptance of
this product.

Applications

Rubber compounds containing VA have excellent scorch safety.
Safe processing temperature: 125℃ (rheometer ts2 > 20 minutes).
Typical crosslinking temperature: 160℃ (rheometer t90 about 12 minutes).

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