Environmental stress cracking resistance testing apparatus of Insulating and sheathing material IEC 60811-4-1

IEC 60811-4-1 Insulating and sheathing materials of electric and optical cables - Common test methods - Part 4-1: Methods specific to polyethylene and polypropylene compounds - Resistance to environmental stress cracking - Measurement of the melt flow index - Carbon black and/or mineral filler content measurement in polyethylene by direct combustion - Measurement of carbon black content by thermogravimetric analysis (TGA) - Assessment of carbon black dispersion in polyethylene using a microscope. 

Testing Methods and Steps

Sample Preparation: Prepare sheet and plate samples that comply with the standard. 

Pre-strain: Subject the samples to a pre-strain treatment under specific environmental conditions. 

Observation and Recording: After a certain period of pre-strain, observe and record the changes in the samples, especially the cracking conditions in localized surface areas. 

Result Analysis: Assess the environmental stress cracking performance of the samples based on their changes. 

Materials commonly tested under IEC 60811-4-1 are high-density polyethylene and other thermoplastic materials, which demonstrate important knowledge of their performance and durability, enabling them to withstand specific applications.

Through these steps, the crack resistance of plastic materials under specific environmental conditions can be effectively measured, thereby assisting in the selection of suitable materials for different application scenarios.

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