Material Analysis
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Heat extension of cross-linked polyethylene XLPE products exceeding the standard
Problem Phenomenon
The elongation of XLPE products in the heat extension test exceeds the limit of 175%.
Heat extension exceeding the standard indicates insufficient cross-linking degree or incomplete cross-linking network, and the product is easily deformed at high temperatures.
Cause Analysis
（1）The cross-linking degree is insufficient and the cross-linking network density is not enough
（2）The cross-linking temperature is too low or the time is insufficient
（3）The peroxide dosage is insufficient
（4）The silane cross-linking condensation is incomplete
（5）The irradiation cross-linking dose is not enough
Solution
（1）Increase the cross-linking agent dosage to the optimized formulation value
（2）Raise the cross-linking temperature or extend the cross-linking time
（3）Check the catalyst activity and warm water cross-linking conditions
（4）Increase the dose for irradiation cross-linking or perform post-treatment annealing
（5）Regularly test the heat extension index and establish quality control records
Key Takeaway
Heat extension exceeding the standard is a direct manifestation of insufficient cross-linking degree, and needs to be comprehensively adjusted from the cross-linking formulation and process parameters.
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