Optimized to survive high humidity, salt aerosols, and massive shock loading in heavy transit fleets.
Analyzing environmental factors that deteriorate conventional vehicle seals in Bioko Island and Rio Muni.
Equatorial Guinea exhibits a unique macroeconomic and climatic structure. The economy, heavily anchored in hydrocarbon extraction around Malabo (Bioko Island) and expanding infrastructure developments in Bata (Rio Muni), relies intensely on heavy-duty logistics. Commercial transport fleets, heavy machinery used in forestry extraction, offshore oil rigs, and port container carriers represent the vital arteries of local trade. However, operating these systems under equatorial conditions presents extreme material degradation risks.
The local climate is characterized by exceptionally high relative humidity (often exceeding 85% to 90% year-round), persistent salt spray corrosion near bustling hubs like Luba Freeport and Bata Port, and intense ultraviolet (UV) solar radiation. In these environments, standard grade automotive seals break down rapidly, leading to ozone cracking, loss of structural elasticity, and water intrusion. When a container door seal fails on an offshore supply vehicle, or a cabin gasket crumbles on a timber dump truck in the dense forests of Evinayong, the economic impact is immediate: asset depreciation, cargo damage, and costly vehicle downtime.
Relative Humidity Resilience
Ozone Aging Index Protection
Broad Operating Temperature
ISO9001 Customization Synergy
As a specialized manufacturer serving the West African corridor, we engineer our heavy-duty vehicle sealing strips to combat these exact geographic variables. By leveraging high-density Ethylene Propylene Diene Monomer (EPDM), custom co-extruded dense/sponge rubber composites, and structural metal carriers, we guarantee that our products provide unmatched isolation barriers. These barriers prevent dirt, moisture, and high-salinity air from penetrating crucial mechanical and passenger cabins.
A unified system of scientific research, advanced compound extrusion, and global logistics integration.
Zhejiang Haala Automotive Parts Co., Ltd. is a premier, medium-sized private enterprise mainly engaged in the production of various types of vehicle sealing strips. Our operations seamlessly integrate advanced scientific research, custom tooling development, continuous vulcanization production, and global commercial sales. Located strategically within the Matun Industrial Zone of Qinghe County—China's legendary rubber manufacturing cluster—we bring nearly a decade of dedicated production experience to the international market.
Our core philosophy, "people-oriented, technology-driven," pushes us to invest constantly in state-of-the-art infrastructure. Our testing methods are exceptionally complete, constituting a comprehensive one-stop production model that spans raw material formulation prep, high-precision steel mold development, and automated product molding. Because our supply chains are vertically integrated, we maintain complete control over raw material purity, compound viscosity, and profile dimensions, making our products highly sought after globally.
Our plant features continuous microwave vulcanization lines, flat bed hydraulic presses for custom molded gaskets, and high-speed multi-profile extruders. We are capable of processing complex material blends including co-extruded EPDM sponge-dense rubber with integrated steel wire/clip carriers, modified thermoplastic elastomers (TPE/TPV), high-grade silicones, and weatherproofing plasticized PVC. Our factory profile and capability list details our extensive range:
The company specializes in producing various automotive sealing strips, door and window sealing strips, air conditioning sealing strips, furniture sealing strips, electrical sealing strips, foam sealing strips, mechanical sealing strips, automotive windshield sealing strips, door sealing strips, decorative strips, skeleton strips, extruded sealing strips, E-type, P-type, D-type sealing strips, rubber sealing strips, EPDM rubber sealing strips, EPDM sponge (foam) sealing strips, three composite sealing strips, dense sponge steel core three composite sealing strips, four composite sealing strips, soft hard composite sealing strips, soft plastic hard plastic composite sealing strips, building sealing strips, modified PVC sealing strips, plastic sealing strips, building rubber sealing strips, aluminum alloy Door and window sealing strips, plastic steel door and window sealing strips, glass curtain wall sealing strips, container door frame sealing strips, cabinet door sponge rubber sealing strips, refrigerated door sealing strips, self-adhesive sealing strips, door glass sliding groove strips, door sponge sealing strips, interior decoration strips, door glass water blocking strips, glass windshield sealing strips, fireproof sealing strips, flame-retardant pipes, rubber hoses, silicone pipes, wrapped rubber hoses, water pipes, air pipes, oil pipes, automotive rubber seals, EPDM sealing strips Comes with self adhesive foam flexible sealing strip, sponge rubber strip, sealant strip, foam rubber strip, glass pressure strip, glass rubber strip, glass waterproof strip, glass door sealing strip rubber molded parts, mechanical seals, foam seals, seals, gaskets, special rubber pads, EPDM rubber molded products rubber strips, silicone strips, transparent strips, dust-proof strips, rubber (PVC) strips, white rubber strips, various specifications and colors. Various rubber, silicone, rubber plastic, and EPDM products.
We execute rigorous aging trials, including ozone testing chambers, tensile strength testing, low-temperature elasticity recovery analyzers, and continuous compression set gauges to ensure durability.
Our co-extrusion technology embeds steel wire/clip carriers into dense EPDM cores, fused seamlessly to microcellular EPDM sponge bulbs for airtight, mechanically anchored closures.
Our components are exported to Japan, Germany, the United States, France, Iran, Australia, Türkiye, India, Nigeria, Brazil, Russia, and neighboring West African ports, gaining universal trust.
Why EPDM and silicone compounds outperform standard PVC under coastal African environmental strain.
Choosing the correct elastomeric polymer is a complex engineering task. For heavy machinery operating in Equatorial Guinea's construction and shipping sectors, mechanical seals must resist long-term compression, dynamic mechanical shear, and high-temperature thermal cycling. When a vehicle is parked under direct equatorial sun, surface temperatures on metal doors can exceed 80°C. Standard PVC and low-grade rubber strips undergo plasticizer migration, leading to stiffening, brittleness, and catastrophic structural failure.
| Polymer Property | Standard EPDM Compound | Silicone Rubber (VMQ) | Plasticized PVC (Refined) |
|---|---|---|---|
| Operating Temp Range | -40°C to +130°C | -60°C to +200°C | -20°C to +70°C |
| Ozone & UV Resistance | Outstanding (No cracks after 500h) | Exceptional (Excellent UV stability) | Moderate (Prone to chalking & fading) |
| Compression Set (Recovery) | High Elastic Recovery (< 25% set) | Excellent Recovery (< 15% set) | Poor (Deforms permanently under load) |
| Saline / Sea Water Resistance | Impervious to salt spray & minerals | Excellent chemical resistance | Susceptible to localized plasticizer leaching |
For high-capacity shipping container frames and heavy truck door systems, we recommend co-extruded dense and sponge EPDM composite profiles. The dense EPDM portion houses a reinforced steel wire skeleton or metal stamping carriers, providing a robust grip on the vehicle edge. The sponge bulb portion contains microscopic nitrogen gas cells, allowing the seal to compress with low door closure force while maintaining continuous outward pressure against the door frame, blocking water and dust ingress.
Optimized freight paths, massive raw material leverage, and flexible tooling development.
Being based in Qinghe County allows us to procure pure EPDM compounds and high-strength adhesive backings at bulk scale. This cluster effect translates to competitive unit prices without compromising ISO manufacturing standards.
We boast an in-house CAD/CAM tooling department capable of manufacturing custom extrusion dies in 5 to 7 working days. Provide your custom vehicle frame drawings or physical cross-sections, and we will produce samples immediately.
We work directly with major ocean shipping lines to ensure smooth ocean freight routes from Qingdao, Shanghai, or Ningbo ports to Bata Port and Malabo Port (Bioko Island). We handle customs documentation, seaworthy packaging, and bulk loading options.
Where our high-durability seals are deployed across Rio Muni's heavy infrastructure sectors.
Log harvesting and heavy lumber transport require trucks to travel over unpaved, dusty, and muddy jungle roads. Our double-lip EPDM sponge rubber seals with integrated metal carriers mount firmly onto cabin doors. They prevent dense clay dust from entering the cabin, protecting electronic instrument panels and improving driver comfort.
Offshore supply vessels and port crane control rooms are subject to constant sea spray. Conventional seals dry out and crumble under salt-spray crystallization. Our specialty silicone and neoprene-EPDM hybrid seals remain highly elastic, resisting chemical washes, engine fuel splashes, and high sea air salinity.
Urban buses and commercial transit trucks require daily door openings and closures. The high density steel-core composite sealing strip prevents premature tearing or displacement. Our EPDM sponge core provides excellent sound isolation, reducing interior cabin noise and vibration.
Refrigerated cargo trucks transporting freshly caught fish must maintain stable internal temperatures. Our seamless, flexible seamless heavy-duty D-shape rubber gaskets prevent thermal bridges. They are food-contact safe, flexible down to -40°C, and keep energy consumption minimal.
Clear, technical guidance to assist procurement officers and fleet maintenance managers in making purchasing decisions.
Our premium EPDM sealing strips, reinforced with high-molecular-weight polymers, are designed to withstand at least 8 to 10 years of intensive tropical solar exposure and marine environment corrosion. Unlike standard rubber, which cracks within 12-18 months, our compounds incorporate anti-ozone inhibitors and chemical UV stabilizers to prevent structural degradation.
Yes. We possess an in-house tooling workshop where we design, wire-cut, and polish custom extrusion dies. Customers only need to supply a sample piece, a cross-sectional CAD drawing, or dimensions of the vehicle panel edge. Once the mold is verified, we run a short pre-production batch for sample testing before full mass production.
Our manufacturing processes conform to IATF 16949 (the global automotive quality standard) and ISO 9001:2015. We provide material inspection certificates (MTRs), SGS environmental compliance test sheets, RoHS validation, and physical parameter logs (tensile strength, hardness Shore A, tear resistance, ozone testing results).
To prevent profile deformation and physical damage, sealing strips are wound onto heavy cardboard reels, placed inside thick corrugated cartons, and stacked onto fumigated heat-treated wooden pallets. The palletized units are shrink-wrapped in moisture-barrier plastic wrap. Each container contains silica-gel packets to absorb ambient humidity during transit.
For standard profiles (such as U-channels and D-shapes), the typical MOQ is 1,000 meters. For highly customized profiles requiring a new extrusion die, the MOQ starts at 3,000 meters. We also offer flexibility for trial orders to support public transport fleets and infrastructure developments in Central Africa.
Explore our full industrial product line with exact part specifications and design options.
Haala Parts
