A: Traditional rubber strip joint processes (adhesive/cutting) have obvious defects: gaps cause water/dust leakage, low joint strength, and easy aging/falling off. Injection corner jointing uses secondary vulcanization fusion technology: put the cut rubber strip ends into a precision mold, inject the same raw rubber at high temperature/pressure, and fuse the joint with the main body through vulcanization. The joint strength reaches ≥90% of the main body, realizing seamless IP67-level sealing, and the aging resistance is completely consistent with the rubber strip—perfect for corner connection of automotive/special-shaped industrial sealing strips.

A: Ultra-low temperature rubber strips (cold storage, liquid nitrogen equipment, alpine automotive sealing) need to avoid hardening/cracking at low temperatures, and the recommended materials are:

• -40~200℃: Special low-temperature silicone rubber (excellent low-temperature flexibility, the most commonly used);
• -40~150℃: Low-temperature formula EPDM (good wear resistance, suitable for outdoor low-temperature scenarios with friction);
• -50~120℃: TPV (thermoplastic vulcanizate, easy to process for complex structures).

Structurally, it is recommended to use a soft design (40-50 Shore A), appropriately reduce the cross-section thickness to avoid excessive low-temperature compression and ensure sealing performance.

A: Rubber strip sealing performance is tested according to IEC 60529 IP grade standard, simulating actual installation conditions for dustproof and waterproof tests:

• IP65 (industrial electrical cabinets/machine tools): 80kPa negative pressure dust spraying for 2h + water jet flushing for 3min, no dust/water ingress inside;
• IP67 (automotive strips/heavy industrial equipment): IP65 test + 1m deep water immersion for 30min, completely no water ingress.

A: NEV rubber sealing strips have three core special requirements based on battery and motor characteristics:

1. Battery pack sealing: IP67/IP68 high-level waterproof/dustproof, to avoid short circuit caused by water ingress;
2. Motor compartment sealing: Higher high-temperature resistance (adapt to motor heat generation), good heat dissipation matching;
3. Whole vehicle environmental protection: Zero harmful volatilization, no peculiar smell—because NEVs have no engine noise, the interior environmental protection requirements are stricter.

The main materials are still EPDM/HNBR, but the formula is optimized for high temperature/anti-static performance, and the structure is designed with double sealing for key parts (battery pack).

A: Rubber strips are prone to aging/cracking due to environmental factors, and simple daily maintenance can effectively extend their service life (3 key methods):

1. Regular cleaning: Wipe the rubber strip surface with a soft cloth and clean water (avoid chemical cleaners such as alcohol/bleach) to remove dust/oil and prevent corrosion;
2. Aging inspection: Check the rubber strip every 3-6 months for hardening/cracking/peeling—if the surface is dry, apply a small amount of rubber maintenance agent (avoid oil-based agents);
3. Timely replacement: Replace the rubber strip in time when obvious deformation/gaps/sealing failure occur (especially for key parts such as automotive engine compartments/battery packs), to avoid equipment/vehicle failure caused by poor sealing.

For outdoor rubber strips, it is recommended to add a protective cover in extreme weather (high temperature/snow) to reduce environmental erosion.