Material Drying
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PA66 automotive cooling system
Problem Phenomenon
Radiator water tanks and thermostat housings leak and crack, failing after long-term contact with coolant
Cause Analysis
Under the combined action of coolant and high temperature, PA66 hydrolysis accelerates, and ordinary grades have insufficient life; glass fiber reinforced hydrolysis-resistant grades combined with welding process can meet cooling system requirements
Solution
①Select hydrolysis-resistant glass fiber reinforced special grades; ②Optimize vibration welding or hot plate welding parameters for sealing; ③Dual verification of coolant compatibility and thermal aging; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
The automotive cooling system is one of the most demanding scenarios for PA66; hydrolysis-resistant grades are the prerequisite, welding and verification are the guarantee of batch reliability; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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