China Top 12 Rubber Gasket Seal Strip Suppliers for Industrial OEM

Sourcing industrial components from China is a double-edged sword. You have the potential for massive cost savings and scalability, but you also face the nightmare scenarios that keep procurement officers awake at night: inconsistent quality, certification fraud, and communication that feels like shouting into a void.

I’m Aries Hua. For over 10 years, I’ve been running Silijoy here in Zhejiang, the manufacturing heart of China. I’ve seen the industry from the inside out. I know the difference between a trading company operating out of an apartment and a legitimate OEM factory with full compression molding lines and ISO certifications.

My typical clients—business owners and procurement officers from North America and Europe—come to me because they are tired of the run-around. They need FDA/LFGB compliance¹, tight tolerances, and a partner who understands that a 1mm deviation in a gasket means a leaking product and a ruined brand reputation.

If you are looking for Rubber Gasket Seal Strips for industrial OEM applications—whether it’s for hydration systems, automotive, machinery, or consumer electronics—you need a supplier who values precision as much as you do.

To help you navigate this crowded market, I have compiled a list of the Top 12 Rubber Gasket Seal Strip Suppliers in China. This list includes my own factory, Silijoy, as well as colleagues and competitors across different provinces that specialize in various rubber materials like EPDM, NBR, and—my specialty—Silicone.

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1. Silijoy (Zhejiang)

Location: Zhejiang Province
Core Material: Food-grade & Medical-grade Silicone
Best For: Consumer goods, hydration systems (Tumblers/Bottles), and food-safe gaskets.

I am putting Silijoy at the top not just because it is my business, but because if you are looking for silicone-based sealing solutions, we are arguably the most focused partner you will find for the Western market.

While many factories try to do everything (tires, car mats, and seals), we specialize strictly in silicone product manufacturing. We support over 1,000 successful projects, specifically focusing on the hydration and kitchenware sectors.

Why Silijoy:

• Certified Safety: We deal strictly with BPA-free, FDA, and LFGB certified silicone. If your gasket touches water or food, this is non-negotiable.
• OEM Mastery: We offer full-cycle service. From your CAD drawing or rough sample, we handle the tooling, prototyping (LSR or compression molding), and mass production.
• Quality Control: Unlike massive factories where you are just a number, I personally oversee the QC process. We inspect every single seal ring and gasket before shipping to ensure zero defects.
• Turnaround: We understand the "Mark Chen" type of buyer—you have seasonal demands. We offer fast prototyping and adhere to strict delivery schedules.

2. Hebei Shida Seal Group Co., Ltd.

Location: Qinghe, Hebei Province
Core Material: EPDM, PVC, TPE
Best For: Automotive weatherstripping and heavy-duty industrial seals.

Hebei province is known as the "Rubber Capital" of Northern China. Shida Seal Group is a titan in this region. If you need 50,000 meters of EPDM weatherstripping for automotive doors or window channels, this is where you go.

Why them:
They are IATF 16949 certified (the gold standard for automotive). They have massive extrusion lines capable of handling huge volume orders. However, their focus is heavy industry and automotive, so they may be less flexible with smaller, intricate custom consumer projects compared to a boutique silicone molder.

3. Haining Qianlang Rubber Products Factory

Location: Haining, Zhejiang Province
Core Material: Viton, NBR, EPDM, Silicone
Best For: Diverse material requirements and custom molded parts.

Located near my own hub in Zhejiang, Qianlang is a respected name in the industry. They are not just an extrusion factory; they specialize in molded rubber parts. If your industrial OEM project requires high oil resistance (using NBR) or extreme heat resistance (using Viton/FKM), they have the compounding expertise to deliver.

Why them:
They have a strong engineering team that can assist with material selection. If you aren't sure if you need Neoprene or Nitrile, they can guide you.

4. Qinghe County Great Wall Sealing Co., Ltd.

Location: Qinghe, Hebei Province
Core Material: Rubber & Plastic Extrusions
Best For: Spiral wound gaskets and construction seals.

Another major player from the Hebei cluster. Great Wall Sealing focuses on the construction and architectural sectors. They produce vast quantities of curtain wall gaskets and door seals.

Why them:
Their pricing is incredibly competitive due to proximity to raw material hubs in the North. If your priority is cost-effectiveness for standard profiles in the construction industry, they are a solid choice.

5. Shenzhen Kwant Rubber

Location: Shenzhen, Guangdong Province
Core Material: Precision Rubber & Silicone
Best For: Electronics and high-precision small parts.

Shenzhen is the electronics hub of the world. Kwant Rubber services this sector by providing very small, high-precision gaskets used in mobile phones, detailed medical devices, and electronic enclosures.

Why them:
They are accustomed to the incredibly tight tolerances required by the consumer electronics industry. If your gasket needs to fit into a waterproof watch or a smartphone case, their tooling precision is top-tier.

6. Ningbo Kaxite Sealing Materials Co., Ltd.

Location: Ningbo, Zhejiang Province
Core Material: PTFE, Graphite, Metal Gaskets
Best For: Oil, Gas, and Petrochemical industries.

Moving away from soft elastomers, Kaxite is a leader in rigid and semi-rigid sealing. They specialize in spiral wound gaskets, camprofile gaskets, and PTFE seals used in high-pressure pipe flanges.

Why them:
If you are sourcing for the energy sector (oil rigs, refineries) rather than consumer goods, you need Kaxite. They understand API standards and high-pressure environments.

7. Xiamen Best Seal Imp. & Exp. Co., Ltd.

Location: Xiamen, Fujian Province
Core Material: Polyamide, Rubber, Silicone
Best For: Sanitary ware and plumbing seals.

Xiamen is a port city with a strong history of sanitary ware manufacturing. Best Seal is highly experienced in O-rings and gaskets for plumbing fixtures, toilets, and faucets.

Why them:
They have specific certifications for water regulation (like WRAS or NSF) which are critical for plumbing OEM projects.

8. Hangzhou Sanda Rubber & Plastic Hardware Co., Ltd.

Location: Hangzhou, Zhejiang Province
Core Material: EPDM, Neoprene
Best For: Shock absorption and anti-vibration mounts involving gaskets.

Sanda has been around for a long time and has a good reputation for rubber-to-metal bonding. If your gasket serves a dual purpose of sealing and vibration dampening (like in HVAC machinery), Sanda is a great technical partner.

Why them:
Their engineering support for HVAC and machinery mounting is excellent.

9. Dongguan Borun Hardware & Rubber Products

Location: Dongguan, Guangdong Province
Core Material: Silicone & LSR (Liquid Silicone Rubber)
Best For: Baby products and highly complex over-molding.

Dongguan is famous for high-end manufacturing. Borun utilizes Liquid Silicone Rubber (LSR) injection molding. This is different from the compression molding we often use; it allows for automated, high-volume production of very complex 3D shapes.

Why them:
If you need millions of units of a complex 3D gasket for a tech product, and you have the budget for expensive LSR tooling, Borun is a strong contender.

10. Shanghai Pepsen Polyurethane Co., Ltd.

Location: Shanghai
Core Material: Polyurethane (PU)
Best For: High abrasion resistance seals.

Sometimes you don't need rubber; you need Polyurethane. Pepsen is a specialist in casting polyurethane. If your seal strip is subject to high friction or wear (like a scraper seal in a factory machine), rubber might degrade too fast.

Why them:
They are one of the few factories strictly dedicated to Polyurethane customization in the Shanghai area.

11. Cixi Xinsheng Seal Factory

Location: Cixi, Zhejiang Province
Core Material: Industrial Gaskets & Gland Packing
Best For: Pump and valve sealing.

Located in Cixi, a manufacturing hub near Ningbo, Xinsheng focuses on pump packings and mechanical seals. They deal with braided packings (graphite, PTFE, Aramid) used in industrial pumps.

Why them:
They offer a very traditional, robust industrial product range. If you are refurbishing old machinery or manufacturing heavy-duty water pumps, their sealing solutions are industry standard.

12. Jiangyin Huayuan Rubber & Plastic

Location: Jiangyin, Jiangsu Province
Core Material: Butyl, EPDM
Best For: Waterproofing membranes and adhesive-backed seal strips.

Huayuan is strong in the adhesive sector. They produce butyl rubber tapes and self-adhesive EPDM strips used in roofing and automotive sound deadening.

Why them:
Their ability to apply high-quality pressure-sensitive adhesives (PSA) to rubber strips inline reduces your assembly time.

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How to Choose the Right Supplier for You

When you are looking at this list, you need to filter based on your Product Application.

1. For Food/Beverage (Tumblers, Bottles, Containers): You need high-grade Silicone. This is my domain at Silijoy. We ensure FDA/LFGB compliance and aesthetic perfection.
2. For Automotive/Windows: You need EPDM extrusion ranges. Look toward the Hebei manufacturers like Shida.
3. For High Pressure/Oil: You need PTFE/Graphite. Look at Ningbo Kaxite.
4. For Electronics: You need precision molding. Look at Shenzhen/Dongguan suppliers.

Conclusion

Finding the right OEM partner in China isn't just about Googling "rubber gasket." It's about matching the factory's DNA with your product's requirements. At Silijoy, we understand that Western buyers like you prioritize communication, certification, and consistency above all else. We pride ourselves on offering factory-direct pricing without the communication barriers.

If you are developing a silicone gasket, seal ring, or any custom molded silicone component, contact us today. Let’s send you a free sample so you can feel the quality difference yourself before you commit to a bulk order.

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