High-Current Anti-Spark Connector: Nylon vs PBT Shell High-Temperature Resistance Comparison

High-temperature resistance is vital for connectors in battery packs, charging piles, and industrial equipment—shell materials determine heat tolerance and safety. This article compares nylon and PBT shells for QS Antispark connectors, testing high-temperature performance to guide selection.

High-Temperature Risks for Connector Shells

In high-current applications, internal heat and ambient temperatures (up to 120℃) can soften, deform, or melt inferior shells. Deformation damages internal anti-spark structures (pre-charge resistors, slow-start modules), causing arcing and short circuits. UL 94 flammability standards and thermal deformation resistance are key benchmarks.

Test Parameters (QS Antispark Connector)

Tested QS Antispark connector shells (nylon and PBT) under 80℃-150℃ for 1000 hours, evaluating:

• Thermal deformation temperature
• Flammability rating (UL 94)
• Structural stability after high-temperature aging

Test Results

1. Thermal deformation temperature: Nylon shells deform at 135℃; PBT shells resist deformation up to 150℃—PBT outperforms nylon in extreme heat.
2. Flammability: Both meet UL 94 V-0 (self-extinguishing within 10 seconds), but PBT has lower smoke generation at high temperatures (safer for enclosed battery systems).
3. Aging stability (1000h at 120℃): Nylon shells have a 0.8% dimensional change and slight brittleness; PBT shells have a 0.3% change with no brittleness. PBT maintains structural integrity in long-term high heat.

Application Recommendations

• PBT shells: Ideal for high-temperature scenarios (charging piles, industrial battery packs, enclosed equipment) where 120℃+ temperatures are common.
• Nylon shells: Suitable for moderate temperatures (≤100℃, e.g., AGVs, outdoor low-temperature equipment) with better low-temperature toughness and cost efficiency. Youwei Technology customizes shell materials (flame-retardant additives) for hybrid temperature scenarios.

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