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Precision Gasket
Manufacturing

High-performance industrial gaskets, sealing sheets, gland packing & insulation kits for extreme environments.

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A Precision Gasket Manufacturer

Established in 2004 as Cixi Xinsheng Sealing Factory, we evolved into Ningbo Dongheng Sealing Co., Ltd. in 2020, building on over 20 years of expertise in manufacturing high-quality sealing solutions.

Our mission is to deliver reliable, durable, and chemically resistant sealing products that meet international standards including EN 1514-1 and ASME B 16.21. From oil & gas to food processing, our gaskets ensure leak-free performance under extreme pressure and temperature.

  • 20+ Years of Industry Experience
  • Custom Solutions from CAD Drawings
  • Global Export to 50+ Countries
Factory Interior Manufacturing Process Quality Inspection Product Detail

Our Products

Engineered for reliability in extreme conditions — from high-pressure valves to chemical processing equipment.

Spiral Wound Gasket

Spiral Wound Gasket

Stainless steel winding with graphite filler. Ideal for high-pressure flanges in oil & gas applications.

  • • Material: SS304/316 + Graphite
  • • Standards: ASME B16.20
  • • Temp Range: -200°C to 1000°C
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Kammprofile Gasket

Kammprofile Gasket

Metal core with outer sealing layers. Excellent for heat exchangers and cyclic temperature environments.

  • • Core: Carbon Steel or SS
  • • Facing: Graphite or PTFE
  • • Reusable & Resilient
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Non-asbestos Gasket

Non-Asbestos Gasket

Eco-friendly alternative with superior strength and anti-penetration. Ideal for valves and pumps.

  • • Asbestos-Free & Safe
  • • High Elasticity
  • • Thickness: 1.5–6.0mm
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Reinforced Graphite Gasket

Reinforced Graphite Gasket

High-temperature resistant with metal insert. Used in refineries and power plants.

  • • Max Temp: 550°C (in air)
  • • Corrosion Resistant
  • • Custom Shapes Available
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PTFE Gasket

Pure PTFE Gasket

100% PTFE construction. Chemically inert, ideal for food, pharma, and semiconductor industries.

  • • FDA Compliant
  • • Zero Leachables
  • • Anti-Creep Design
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Rubber Gasket

Rubber Gasket

Available in EPDM, Silicone, FKM. Custom colors and shapes for HVAC, automotive, and plumbing.

  • • Multiple Durometers
  • • Weather & UV Resistant
  • • Molded or Die-Cut
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Double Jacketed Gasket

Double Jacketed Gasket

Metal outer shell with soft filler. Combines strength with conformability for irregular flanges.

  • • Shell: SS, CS, or Alloy
  • • Filler: Graphite or PTFE
  • • ASME B16.21 Compliant
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Gland Packing

Graphite Gland Packing

Braided flexible graphite for pumps and valves. Excellent thermal conductivity and low friction.

  • • High Pressure Rating
  • • Low Spalling
  • • Rotating & Static Shafts
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Our Services

Tailored solutions to meet your exact sealing requirements.

Precision Manufacturing

Translate your CAD drawings (DWG, SOLIDWORKS, etc.) into precision gaskets with tight tolerances.

Technical Consultation

Operational audit and failure-preventive matching to extend equipment life and reduce downtime.

Custom Dimensions

Non-standard sizes and shapes available on request. We manufacture to your exact specifications.

Logo Customization

Brand your sealing products with custom logos via embossing, printing, or laser marking.

Industries We Serve

Reliable sealing solutions across critical sectors.

Oil & Gas

High-pressure gaskets for pipelines, valves, and refineries. Resistant to hydrocarbons and extreme temperatures.

Chemical Processing

Corrosion-resistant PTFE and graphite seals for reactors, pumps, and storage tanks.

Power Generation

Heat-resistant gaskets for turbines, boilers, and heat exchangers in thermal and nuclear plants.

Food & Beverage

FDA-compliant PTFE and rubber gaskets for hygienic processing and packaging equipment.

Pharmaceutical

Ultra-pure, non-leaching seals for sterile environments and cleanroom applications.

HVAC & Plumbing

Flexible rubber and composite gaskets for water systems, chillers, and compressors.

Get in Touch

Need a custom solution or have technical questions? Reach out to our engineering team.

Phone

+86-13566064802

Location

No.67, Xinhua Road, Xiaolin Town, Cixi City, Zhejiang, China 315300

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