Explore our flagship OEM/ODM underbody gaskets, EPDM profile extrusions, and waterproof elastomeric sealing components engineered for global vehicle manufacturers.
In modern vehicle engineering, underbody sealing systems represent a critical defense matrix against environmental degradation, mechanical wear, NVH (Noise, Vibration, and Harshness) intrusion, and structural battery box contamination in New Energy Vehicles (NEVs).
The global shift toward Electric Vehicles (EVs) has drastically redefined underbody sealing specifications. Traditional Internal Combustion Engine (ICE) vehicles primarily relied on chassis undercoating and basic perimeter gaskets. Modern EV architectures demand complex, hermetic battery enclosure sealing strips, floor pan splash guards, and structural elastomer shields capable of meeting IP67 and IP69K ingress protection standards.
Underbody seals must now endure thermal runaway insulation, prevent electrolyte moisture contamination, and isolate low-frequency cabin noise previously masked by combustion engine sound.
Automotive underbodies operate under extreme mechanical and chemical stress. OEM buyers require sealing strips capable of maintaining tensile memory and elastic recovery through temperature ranges from -40°C up to +150°C. Furthermore, these components must resist aggressive road salts, calcium chloride, battery fluid splashes, gravel impacts, and continuous UV/ozone exposure without micro-cracking or compression set failure.
Achieving optimal longevity and acoustic damping requires advanced formulation of synthetic elastomers, multi-cavity continuous extrusion, and composite core reinforcement.
Ethylene Propylene Diene Monomer (EPDM) serves as the industry backbone for vehicle weatherstripping. Featuring an inert saturated polymer backbone, EPDM provides outstanding resistance to ozone degradation, weathering, and heat aging. Dense EPDM provides high structural rigidity, while micro-cellular sponge EPDM ensures smooth closure forces and low compression set.
Advanced underbody profiles utilize tri-composite co-extrusion technology. This integrates a rigid steel/metal backbone or flexible wire carrier with dense structural rubber and soft sponge sealing lips. This composite architecture delivers exceptional retention force on chassis flanges while ensuring airtight sealing performance.
For high-oil or extreme thermal environments, NBR (Nitrile Rubber), Fluororubber (FKM), Silicone, and TPV/TPE modified compounds are deployed. Integrated self-adhesive backings (utilizing automotive-grade 3M acrylic foam tapes) facilitate fast assembly line integration and permanent substrate bonding.
| Elastomer / Material Type | Temp Range (°C) | Tensile Strength (MPa) | Ozone / UV Resistance | Oil & Fuel Resistance | Primary Automotive Application |
|---|---|---|---|---|---|
| Dense EPDM Rubber | -40 to +130 | 12 - 18 | Excellent | Fair | Chassis frame seals, door edge guards, U-channels |
| Sponge EPDM Foam | -40 to +120 | 3 - 6 | Excellent | Fair | Underbody floor pan gaskets, door & trunk seals |
| NBR (Nitrile) Rubber | -30 to +120 | 10 - 15 | Moderate | Excellent | Engine bay underbody washers, oil pan gaskets |
| Silicone Elastomer | -60 to +230 | 6 - 10 | Outstanding | Moderate | High-temp exhaust heat shields, turbo hoses |
| TPV / TPE Compounds | -40 to +135 | 8 - 14 | Excellent | Good | Recyclable underbody trim, aerodynamic deflectors |
Located in the heart of China’s automotive rubber hub—Matun Industrial Zone, Qinghe County—our manufacturing infrastructure leverages vertical integration to deliver unmatched speed, precision, and cost efficiencies for global Tier-1 and OEM clients.
Zhejiang Haala Automotive Parts Co., Ltd. is a specialized, medium-sized private enterprise dedicated to the research, engineering, extrusion, and global sales of premium vehicle sealing systems. Integrating advanced polymer research with rapid tooling development, our enterprise delivers customized sealing solutions tailored to rigorous global automotive standards.
Our production plant is equipped with continuous EPDM microwave vulcanization lines, precision rubber molding production lines, flat vulcanization presses, and multi-cavity extruders, supported by complete testing methodologies forming a true one-stop production model spanning raw material preparation, mold development, and automated product molding.
Adhering to the core quality philosophy of "Reputation First, Quality Driven, People-Oriented", we continually elevate employee technical expertise, introduce automated vision inspection equipment, and refine lean manufacturing workflows to achieve total customer satisfaction.
Our comprehensive testing technology covers tensile strength analysis, compression set testing, durometer hardness control (Shore A 40 to 85), high-low temperature thermal shock testing, and salt spray corrosion testing to guarantee 100% batch consistency.
Continuous EPDM Extrusion & Vulcanization Lines
In-House Tooling Development & Precision Molding Facilities
From passenger cars and electric commercial vans to heavy-duty trucks, HVAC machinery, and architectural assemblies, our elastomeric extrusion portfolio addresses diverse industrial sealing challenges.
Our products are engineered to comply with strict international regulatory frameworks, making us a trusted partner for OEMs and Tier-1 automotive buyers across global markets.
Zhejiang Haala Automotive Parts Co., Ltd. has established an extensive global distribution network. Our premium extruded sealing profiles, gaskets, and hoses are exported to:
Integrated engineering excellence built on nearly ten years of specialized production experience in Matun Industrial Zone, Qinghe County.
Professional production of various automotive sealing strips, door and window sealing strips, air conditioning sealing strips, furniture sealing strips, electrical sealing strips, and foam sealing strips with high-volume output capacity.
Strong technical strength and management experience. Complete testing methods forming a seamless one-stop production mode encompassing raw material preparation, mold development, and precise product molding.
Our products are sold across Japan, Germany, the United States, France, Iran, Australia, Türkiye, India, Nigeria, Brazil, Russia, and other key international markets, earning high praise from clients worldwide.
The automotive component ecosystem is evolving rapidly toward sustainability, weight reduction, and smart manufacturing integration.
Environmental regulations (such as EU REACH and RoHS) are accelerating the adoption of Thermoplastic Vulcanizates (TPV). Unlike traditional thermoset rubber, TPV profiles offer 100% recyclability, lower density, and up to 30% weight savings for vehicle underbodies.
Underbody sealing strips located around EV battery trays are increasingly integrated with flame-retardant ceramic glass fiber layers and intumescent silicone materials to withstand extreme temperatures in the event of thermal battery expansion.
Modern extrusion lines incorporate multi-axis laser profile scanners that continuously measure cross-sectional dimensions in real-time, enforcing sub-millimeter tolerances and eliminating dimensional drift during high-speed production runs.
Expert answers to common engineering, procurement, and customization inquiries regarding automotive underbody sealing products.
Explore our expanded inventory of universal weatherstripping, D-shape soundproofing strips, NBR washers, and specialized truck sealing hardware.
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