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Engineered to seal,

The last line of defense against leakage

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+86-13566064802
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Choosing the Right Gasket

Our company specializes in the production of high-quality sealing products, including gaskets, packing, 
and other critical sealing components.
High Pressure Insulation Kit
HPSEAL Insulating Gasket Material
Gasket Thickness: 6.6mm
Insulating laminate: GRE G10 or G11
Stainless Steel Core Thickness: 3mm
Stainless Steel Material: Normally SS316/L, other SS material also can be provided,
such as DSS31803, SDSS32750, Inconel825, Inconel625.
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Fire Safe Insulating Kit
RFSEAL Insulating Gasket Material:
Gasket Thickness: 6.6mm
Insulating laminate: GRE G10 or G11
Stainless Steel Core Thickness: 3mm
Stainless Steel Material: Normally SS316/L, other SS material also can be provided, such as DSS31803, SDSS32750, Inconel825, Inconel625.
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Low Pressure Insulation Kit
    DH-S-NPSEAL sealing gaskets use a rectangular sealing element enclosed into a unique groove to seal and isolate all types of flanges. This kind gasket can provide theoretical near zero “m” and “y” factors resulting in effecting a positive seal without excessive bolt loads required with flat gaskets. Materials such as Teflon and Viton also can be Used as the sealing element,which increases the choice of material.
    NPseal sealing gaskets are widely used for low and medium pressure, but in order to get much better sealing performance, for the pressure equal to or higher than ANSI 600#, please consider HPSEAL sealing gaskets first.  
 
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Heavy-Duty Metallic Gasket for Pipelines

Kamprofile (Serrated) gasket is mechanically made from integral metal. Groove of concentric circles by processing with professional equipments. It can be better sealed then the general metallic flat gasket. It is suitable for use on the flange pipe of high pressure and high temperature. 

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DH-T-FB Reinforced Graphite Sheet
DH-T-FB Reinforced Graphite Sheet is a high-performance sealing material designed for extreme temperature and pressure conditions. Made from high-purity graphite reinforced with stainless steel, Inconel, or other metal inserts, it delivers superior thermal conductivity, chemical resistance, and mechanical strength.

This advanced sealing solution is ideal for flange gaskets, heat exchangers, refineries, and high-temperature industrial applications** where traditional materials fail.
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DH-T-EPB Expanded PTFE Sheet
​DH-T-EPB Expanded PTFE (ePTFE) Sheet is an advanced microporous material developed through a unique expansion process that transforms standard PTFE into a highly flexible, fibrillated structure. This innovative manufacturing technique creates a material with exceptional sealing performance while maintaining PTFE's renowned chemical resistance and thermal stability. ePTFE sheets are widely recognized as premium sealing solutions across multiple industries.
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Services We Provide

Non-Standard & Drawing-Based Customization
Precision Manufacturing: Translate your CAD drawings (DWG/SOLIDWORKS...
Technical Consultation & Product Matching
Operational Audit: Analyze your、Failure-Preventive Matching、Cost...
Logo Customization Service for Branded Sealing Products
Logo Customization Options:We offer multiple techniques to...

About Us

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

Why Choose Us

Our company is a professional sealing gasket manufacturer, has more than 20 years of development, the main products are spiral wound gasket,Kammprofile gasket,ring joint gasket, PTFE gasket and gland packing etc...
 OEM/ODM Capabilities
 Technical Consultation Services
 Emergency Order Handling

Our Industries

We take pride in delivering reliable and durable solutions tailored to meet the demanding requirements of various industries, such as oil & gas, chemical processing, power generation, and manufacturing.
Petroleum
Natural Gas
Chemical Processing
Metallurgy
Power Generation
Manufacturing
DIGITAL SHOWROOM
If you want to learn more about our manufacturing capabilities, you can click on the avatar in the scene, or accept my invitation!
Latest News & Updates
July 31, 2026

This guide compares SS316 vs SS316L spiral wound gaskets by carbon content, corrosion behavior, weldability, temperature exposure, and long-term reliability. It explains sensitization, chromium carbide precipitation, intergranular corrosion, molybdenum-based pitting resistance, filler limits, flange loading, ASME B16.20 color coding, and dual certification. Readers learn when SS316 may be acceptable, why SS316L is preferred for welded, chloride-rich, high-temperature, or aggressive chemical service, and how MTRs, PMI testing, filler selection, and galvanic-corrosion controls reduce procurement and installation risks. The comparison also addresses availability, mechanical strength, and component-specific metallurgy.

July 31, 2026

Learn how to translate engineering drawings into production-ready custom gaskets. This guide covers material selection, manufacturing methods, and RFQ tips.

July 31, 2026

This guide explains how a graphite spiral wound gasket combines metallic windings and flexible graphite filler to seal high-pressure, high-temperature piping systems. It covers winding materials, inner and outer rings, temperature and pressure limits, chemical compatibility, dynamic recovery, and flange distortion tolerance. Readers can compare graphite with PTFE and mica, review applications in refining, power generation, and oil and gas, and select CG or CGI configurations. Practical installation guidance addresses bolt torque, over-compression, inward buckling, handling, storage, and metallurgy selection for reliable, leak-free service.

WhatsApp / Tel

+8613566064802

Address

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