Engineered for high compression set resilience, sound attenuation, and harsh environmental protection.
Modern infrastructure, transport networks, and manufacturing operations rely heavily on elastic sealing integrity. Dynamic shifts in global industrial practices demand sealing systems capable of withstanding aggressive environmental factors, severe heat fluctuations, and constant mechanical degradation. As industries upgrade to meet strict zero-leakage standards, ordinary commodity-grade sealing strips fail to maintain structural recovery over prolonged lifecycles.
In response to these demands, Zhejiang Haala Automotive Parts Co., Ltd. develops composite sealing strips engineered with multi-component co-extrusions (combining rigid carriers, highly flexible sponge bulbs, and internal metal inserts). Across automotive assembly lines, infrastructure projects, and marine container fleets, specialized elastomer compounding ensures long-term resistance against compression set, ozone exposure, and severe weather wear.
Critical performance metrics are defined by material compounding: the density of the sponge component governs closing force requirements, while internal steel or wire-mesh reinforcements provide structural grip on dynamic flanges without sacrificing elastomeric flexibility.
Years Engineering Experience
Countries Supplied Globally
Custom Tooling Capability
Leakage System Compliance
Integrating scientific research, product development, large-scale vulcanization extrusion, and global technical sales, Zhejiang Haala Automotive Parts Co., Ltd. (also identified with production operations as Hebei Ruiyuan Automotive Parts Co., Ltd.) is a medium-sized private enterprise dedicated to modern elastomeric sealing profiles. Strategically situated in the Matun Industrial Zone of Qinghe County, our facility benefits from close alignment with regional manufacturing and logistics infrastructure, enabling streamlined delivery across global supply chains.
Our facility houses advanced co-extrusion production lines capable of manufacturing multi-hardness composites in a single pass. Our product portfolio spans automotive main door seals, trunk weatherstrips, architectural curtain wall gaskets, air conditioning casing seals, and heavy mechanical enclosure profiles. Backed by nearly ten years of experience, we support clients throughout the entire product lifecycle—from raw material formulation and in-house mold development to quality inspection and high-volume delivery.
Haala maintains strong technical capacity and solid management experience. Driven by the core philosophy of "people-oriented, technology-driven," we focus on creating value through quality and driving innovation through healthy competition. We invite global partners to collaborate with us for mutual growth in sealing technology.
We operate modern EPDM continuous vulcanization lines and high-precision PVC/Silicone extrusion networks, handling dual and triple-composite profiles with integrated steel reinforcements.
Equipped with micro-hardness testers, aging chambers, and compression set instruments. Our engineering controls manage everything from polymer preparation to final profile validation.
Our sealing profiles are exported to major industrial centers, including Japan, Germany, the United States, France, Iran, Australia, Türkiye, India, Nigeria, Brazil, and Russia.
Providing specialized solutions designed to meet localized environmental stresses and engineering standards.
Providing noise, vibration, and harshness (NVH) isolation across vehicles from consumer SUVs to heavy-duty logistics trucks. Engineered to maintain sealing under structural movement, EPDM steel-reinforced and multi-composite door frame profiles withstand high wind pressure and temperature cycling.
Designed for heavy industrial machinery, generator casings, and electrical control boxes. These seals protect internal electronics and components from environmental contamination, dust, and water ingress. High-density silicone foam strips and anti-leak gaskets maintain compression recovery under repeated closure cycles.
Providing custom weatherstripping for commercial glass curtain walls, aluminum alloys, and steel-reinforced windows. These profiles absorb building expansion and wind loads, while specialized EPDM formulations prevent water leakage and draft ingress over long-term building operations.
Designed for container door frames, refrigerated shipping boxes, and railcars. Sealing profiles in these applications must resist saltwater spray, mechanical impact, and sub-zero temperatures. Multi-composite D-type and sponge rubber strips prevent cargo contamination and leakage in global shipping lanes.
Designed for refrigeration doors, cabinets, and soundproof partitions. Specialized soft-hard composite profiles with pressure-sensitive adhesive backing allow for fast assembly-line installation, providing reliable acoustic dampening and thermal containment.
Extending beyond solid weatherstripping, our production lines manufacture flame-retardant silicone pipes, wrapped rubber hoses, air/oil delivery lines, and high-purity fluid conduits for demanding industrial and mechanical installations.
Our operations in Qinghe County leverage regional industrial clusters to source raw EPDM polymers, performance additives, and reinforcing steel inserts directly. This local integration minimizes transport times, raw material delays, and storage overhead, allowing us to maintain stable production pricing despite fluctuations in the global polymer market.
By keeping raw material testing, customized mixing, structural tooling design, and multi-component extrusion in-house, we reduce development cycles from prototype to production. This vertical integration allows us to adjust formulations quickly to meet specific client requirements, ensuring timely delivery for complex, high-volume orders.
Our one-stop production model covers raw material preparation, mold engineering, and final product curing to ensure consistent control over dimensions and physical properties.
Developing specific EPDM, Silicone, and PVC formulations in-house to meet precise density, hardness, and flame-retardant standards.
Designing CAD-driven extrusion dies in-house to maintain strict tolerance control for complex profile shapes.
Using continuous vulcanization lines to co-extrude rigid carriers, flexible sponge structures, and steel reinforcements.
Testing for compression set deflection, environmental aging, and structural adhesion before packaging for shipment.
Industrial sealing technology is moving toward smart, lightweight, and recyclable material systems. Haala's engineering department is investing in thermoplastic elastomer (TPE) and thermoplastic vulcanizate (TPV) extrusion lines. These materials offer the performance benefits of cured EPDM while being fully recyclable, helping customers meet environmental and sustainability goals.
We are also upgrading our co-extrusion technology to produce lighter sponge formulations. By reducing density without losing resilience, these profiles help lower vehicle weight, contributing to energy efficiency in electric transit fleets. Additionally, we are developing integrated sensory seals with embedded thin-wire monitoring paths for smart building and transit applications.
Our quality controls comply with industry standards to ensure consistency across international deliveries.
Our sealing solutions are manufactured to meet international standards. We perform rigorous batch testing to ensure compliance with REACH, RoHS, and automotive standards regarding raw materials, outgassing properties, and volatile organic compound (VOC) emissions.
Our technical team provides localized engineering support, assisting international clients from initial profile dimensioning through compound selection and final tooling. We offer pre-cut profiles, heat-welded corners, and assembly-ready frames. Our logistical network supports diverse shipping arrangements (FOB, CIF, DDP) to keep production schedules running smoothly.
Detailed technical information regarding material selection, design tolerances, and custom development.
Engineered for electrical cabinets, heavy machinery, high-temperature equipment, and soundproofing applications.
Haala Parts