Formulated silane equiv. to Silcat VS-758-0
Description
High density polyethylene pipes crosslinked with formulated silane VS-758 can meet following specifications:
- DIN 16892 (Rohre aus vernetztem Polyethylen)
-EN (155 WI 023)
Moisture content of the PE resin must be less than 200 ppm. In hot and humid countries pre-drying of the resin at 70 c by means of an air desiccator is highly recommended.
Grafting: Optimum addition levels for a given application must be determined experimentally. Data collected on Nextrom extruders indicate that the dose levels are as follows:
Formulated silane VS-758 silane 1.8 to 2.2%
Temperature profile setting of the extruder:
Barrel 170/180/185/195/210/220 c
Head/die 220 c
Screw 140 c
Crosslinking: The rate of cure is dependent upon time, temperature and thickness of the layer and available moisture. A crosslinking degree of 65% (gel content) can be achieved by any of the following methods:
- immersion in water at 80~90 c
- exposure to low pressure steam at 105 c
- exposure to steam at atmospheric pressure (i. e. A sauna at 100 c)
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