Recommend Products
Name: Xiamen Neoprene Isolation Gasket Standard: ASME B16.21 Material: Neoprene Size: 3 Inch Pressure: 150LB Type: Full Face Application: For Chemical and Corrosion Resistance Customized Service: YesQS Gasket: Xiamen Neoprene Isolation Gasket
Name: Zhejiang Gylon 3500 Insulating Gasket Set Material: Gylon 3500 Size: 4 Inch Pressure: 150# Thickness: 1/8" Type: F Sleeves: G11 Washers: G11 + ZPS Standard: For ASME B16.5 Flange Price: 65 - 85 USD MOQ: 1 PCS Delivery Date: 7 - 35 Days Customization: YesQS Gasket: Gylon 3500 Insulating Gasket Set
Name: Xiamen Phenolic insulation Gasket Set Material: Phenolic Size: 8 Inch, RX50 Pressure: 5000 psi Type: D Sleeve: Mylar Washers: Phenolic+ ZPS Standard: For API 6A Flange Price: 199 - 249 USD MOQ: 1 PCS Delivery Date: 7 - 35 Days Customization: YesQS Gasket: Xiamen Phenolic insulation Gasket Set
Name: Xiamen 40inch Gasket Insulation Sets Material: UNIFLUOR-7551 Size: 40 Inch Pressure: 150# Thickness: 1/8" Type: F Sleeve: G11 Washers: G11+ ZPS Standard: For ASME B16.47B-WN-RF Price: 1250 - 1450 USD MOQ: 1 PCS Delivery Date: 7 - 35 Days Customization: YesQS Gasket: Xiamen 40inch Gasket Insulation Sets
Klingersil C4430 Isolation Gasket
QS Gasket: Klingersil C4430 Isolation Gasket
Name: Fujian Klingersil C4430 Isolation Gasket
Standard: ASME B16.5
Material: Klingersil C4430
Compound: with Aramid Fiber Reinforced with a Nitrile Binder
Size: 2 Inch
Pressure: 150LB
Complete Set: with G10 Sleeve and Washers and ZPS
Standard: ASME B16.5
Material: Klingersil C4430
Compound: with Aramid Fiber Reinforced with a Nitrile Binder
Size: 2 Inch
Pressure: 150LB
Complete Set: with G10 Sleeve and Washers and ZPS
Quantity
Klingersil C4430 Isolation Gasket is a 2", Class 150 LB non-metallic isolation kit that complies with ASME B16.5. Based on aramid-fibre-reinforced nitrile rubber, it offers outstanding oil, temperature and sealing performance. The complete set contains G10 insulating sleeves, washers and ZPS metal cladding; once installed it delivers both electrical isolation and sealing protection for critical flanged joints in petrochemical plants, ships and power stations.
Why can the C4430 gasket stop electrochemical corrosion so effectively?
Klingersil C4430 Isolation Gasket combines “seal” and “electrical insulation” in one component, blocking the three prerequisites for electrochemical corrosion at their source. The result is unusually reliable protection.
Klingersil C4430 Isolation Gasket combines “seal” and “electrical insulation” in one component, blocking the three prerequisites for electrochemical corrosion at their source. The result is unusually reliable protection.
1. Breaks the galvanic circuit
On offshore platforms 316L flanges are often mated to carbon-steel pipe, giving a potential difference of ≈0.35 V; seawater acts as the electrolyte. Direct metal-to-metal contact creates a galvanic cell. The body of Klingersil C4430 Isolation Gasket has a dielectric strength of 21 kV/mm and a volume resistivity >10¹² Ω·cm. Together with G10 sleeves (31 kV/mm) and Nomex washers it completely severs the conductive path between flange and bolt; no current can flow and galvanic corrosion is “switched off”.
On offshore platforms 316L flanges are often mated to carbon-steel pipe, giving a potential difference of ≈0.35 V; seawater acts as the electrolyte. Direct metal-to-metal contact creates a galvanic cell. The body of Klingersil C4430 Isolation Gasket has a dielectric strength of 21 kV/mm and a volume resistivity >10¹² Ω·cm. Together with G10 sleeves (31 kV/mm) and Nomex washers it completely severs the conductive path between flange and bolt; no current can flow and galvanic corrosion is “switched off”.
2. Stops cathodic-protection “leakage”
City gas lines frequently use sacrificial-anode cathodic protection. If an old section is electrically continuous with a new stainless branch line, the protection current is drained by the stainless steel, the anode is consumed rapidly and the old pipe keeps rusting from lack of current. After fitting a Klingersil C4430 Isolation Gasket kit at the interface flange, DC resistance tests regularly exceed 500 MΩ, confining the protective current to the target section and avoiding the “rob-Peter-to-pay-Paul” effect.
City gas lines frequently use sacrificial-anode cathodic protection. If an old section is electrically continuous with a new stainless branch line, the protection current is drained by the stainless steel, the anode is consumed rapidly and the old pipe keeps rusting from lack of current. After fitting a Klingersil C4430 Isolation Gasket kit at the interface flange, DC resistance tests regularly exceed 500 MΩ, confining the protective current to the target section and avoiding the “rob-Peter-to-pay-Paul” effect.
3. High-impedance material that neither absorbs moisture nor conducts
Aramid fibre absorbs <0.8 % moisture and nitrile rubber only 0.05 %. Even at 100 % humidity or under intermittent immersion the thickness increase is <5 % and electrical insulation hardly changes. Traditional phenolic-resin gaskets lose two orders of magnitude in resistivity when wet and tend to leak at the edges.
Aramid fibre absorbs <0.8 % moisture and nitrile rubber only 0.05 %. Even at 100 % humidity or under intermittent immersion the thickness increase is <5 % and electrical insulation hardly changes. Traditional phenolic-resin gaskets lose two orders of magnitude in resistivity when wet and tend to leak at the edges.
4. Maintains tight, insulated joint for the long term
Klingersil C4430 Isolation Gasket relaxes only 35 MPa after 16 h at 50 MPa and 300 °C, and recovers 50 %, keeping the sleeve and washers permanently compressed. This prevents vibration or thermal cycling from opening “micro-channels” where tracking could start. In a refinery vacuum unit the gasket still showed 18 kV/mm dielectric strength after eight years of service and the flange faces were free of rust pits.
Klingersil C4430 Isolation Gasket relaxes only 35 MPa after 16 h at 50 MPa and 300 °C, and recovers 50 %, keeping the sleeve and washers permanently compressed. This prevents vibration or thermal cycling from opening “micro-channels” where tracking could start. In a refinery vacuum unit the gasket still showed 18 kV/mm dielectric strength after eight years of service and the flange faces were free of rust pits.
5. Chemical inertness reduces electrolyte formation
The gasket resists oil, brine and H₂S and does not release corrosive ions. Some rubber gaskets age in sour service and exude chloride ions that accelerate pitting; Klingersil C4430 Isolation Gasket eliminates the risk of “home-made electrolyte”.
The gasket resists oil, brine and H₂S and does not release corrosive ions. Some rubber gaskets age in sour service and exude chloride ions that accelerate pitting; Klingersil C4430 Isolation Gasket eliminates the risk of “home-made electrolyte”.
Field example
A Middle-East oilfield joined a 6"Class 150 carbon-steel fire-water line directly to a 6"316 branch. Within six months a 1.2 mm deep circumferential groove appeared at the root of the branch. After replacing the joint with a Klingersil C4430 Isolation Gasket kit and G10 sleeves, the three-year inspection showed no groove growth, ultrasonic wall-thickness measurements were unchanged and insulation resistance was still >1 GΩ, proving that electrochemical corrosion had been arrested.
A Middle-East oilfield joined a 6"Class 150 carbon-steel fire-water line directly to a 6"316 branch. Within six months a 1.2 mm deep circumferential groove appeared at the root of the branch. After replacing the joint with a Klingersil C4430 Isolation Gasket kit and G10 sleeves, the three-year inspection showed no groove growth, ultrasonic wall-thickness measurements were unchanged and insulation resistance was still >1 GΩ, proving that electrochemical corrosion had been arrested.
Therefore, by integrating “high-resistance material + precision kit design + long-term mechanical maintenance”, Klingersil C4430 Isolation Gasket blocks galvanic current, isolates cathodic-protection leakage and retains its dielectric performance in aggressive chemical environments, making it a dependable solution for preventing flange-face electrochemical corrosion.
Send Message
