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C4430 Non-metallic Insulation Gasket
QS Gasket: C4430 Non-metallic Insulation Gasket
Name: C4430 Non-metallic Insulation Gasket
Standard: ASME B16.5
Material: Klingersil C4430
Max Temperature: 400℃
Size: 6 Inch
Pressure: 150LB
Complete Set: with G10 Sleeve and Washers and ZPS
Compound: with Aramid Fiber Reinforced with a Nitrile Binder
Standard: ASME B16.5
Material: Klingersil C4430
Max Temperature: 400℃
Size: 6 Inch
Pressure: 150LB
Complete Set: with G10 Sleeve and Washers and ZPS
Compound: with Aramid Fiber Reinforced with a Nitrile Binder
Quantity
C4430 Non-metallic Insulation Gasket is produced from imported Klingersil C4430 sheet, a composite of aramid fibre and nitrile rubber that withstands 400 °C and is certified to ASME B16.5 6"150 LB. The complete set is supplied with G10 insulating sleeve and washers, positioned by a ZPS metallic outer ring, accomplishing electrical insulation and sealing in one action—an isolation solution purposely built for chemical-plant and marine flanges that is safe, long-life and zero-leak.
What do aramid fibre and nitrile rubber do inside the Klingersil C4430 insulation gasket?
Inside the C4430 Non-metallic Insulation Gasket, aramid fibre and nitrile-butadiene rubber (NBR) are not simply “mixed”; they form a mutually complementary microstructure whose performance has been validated by multiple industrial case histories.
Inside the C4430 Non-metallic Insulation Gasket, aramid fibre and nitrile-butadiene rubber (NBR) are not simply “mixed”; they form a mutually complementary microstructure whose performance has been validated by multiple industrial case histories.
1. Threefold role of aramid fibre
a) Skeleton reinforcement: with a tensile strength of ~3.0 GPa, the fibre builds a 3-D network that raises the gasket’s transverse tensile strength to ≥18 MPa, preventing the shear forces created by bolting torque from “crushing” the gasket.
a) Skeleton reinforcement: with a tensile strength of ~3.0 GPa, the fibre builds a 3-D network that raises the gasket’s transverse tensile strength to ≥18 MPa, preventing the shear forces created by bolting torque from “crushing” the gasket.
b) High-temperature dimensional stability: even at 400 °C the fibre retains >5 % of its room-temperature strength and shows <3 % weight loss, so in 400 °C hot-water or 350 °C saturated-steam lines the C4430 Non-metallic Insulation Gasket still delivers >45 % thickness recovery, avoiding the “thermal relaxation” that reduces bolt residual load.
c) Electrical barrier: the fibre’s volume resistivity of 10¹⁴ Ω·cm, combined with the G10 insulating sleeve, limits flange-to-flange leakage current to <1 mA on 6"150 LB joints, meeting the NORSOK M-503 electrical-isolation requirement for offshore platforms.
2. Threefold role of nitrile rubber (NBR)
a) Elastic binder: after 150 °C vulcanisation NBR becomes the continuous phase that “glues” the aramid into a monolithic sheet, giving the C4430 Non-metallic Insulation Gasket 20–30 % initial compression-recovery to compensate for flange waviness (≤40 µm) and metal creep during temperature cycling.
a) Elastic binder: after 150 °C vulcanisation NBR becomes the continuous phase that “glues” the aramid into a monolithic sheet, giving the C4430 Non-metallic Insulation Gasket 20–30 % initial compression-recovery to compensate for flange waviness (≤40 µm) and metal creep during temperature cycling.
b) Oil-resistant seal: the 33 % acrylonitrile content limits volumetric swell to <5 % in diesel, lube and hydraulic oils; WRC-certified for fuel jetties. After Huangpu Port (Guangzhou) replaced asbestos gaskets with C4430 Non-metallic Insulation Gasket in 2009, tank-stripping pump flange leakage fell from 180 ppm to <10 ppm.
c) Stress-relaxation damper: NBR’s glass-transition temperature of about –35 °C preserves visco-elastic behaviour from –20 °C to +150 °C, cutting the decay rate of bolt torque by 30 % and lengthening the thermal-cycle maintenance interval of the C4430 Non-metallic Insulation Gasket.
3. Real-world failure vs. success comparisons
Case 1 – SECCO ethylene plant, Shanghai (2013): quench-water exchanger (design 230 °C, 1.2 MPa) using pure glass-fibre gaskets suffered “glass embrittlement & leakage” after three months, causing a US $6 million shutdown. After changing to C4430 Non-metallic Insulation Gasket, the unit has run leak-free for 48 months; annual compression measured only 0.15 mm.
Case 1 – SECCO ethylene plant, Shanghai (2013): quench-water exchanger (design 230 °C, 1.2 MPa) using pure glass-fibre gaskets suffered “glass embrittlement & leakage” after three months, causing a US $6 million shutdown. After changing to C4430 Non-metallic Insulation Gasket, the unit has run leak-free for 48 months; annual compression measured only 0.15 mm.
Case 2 – Daxie Island fuel-oil terminal, Ningbo (2017): 8"150 LB steam-tracing line fitted with cheap “aramid + SBR” gaskets; the SBR layer turned to powder within three weeks because it could not resist hot oil. Switching to C4430 Non-metallic Insulation Gasket (aramid + NBR) and inspecting 18 months later showed a perfectly intact cross-section, no blistering or delamination.
Case 3 – CNOOC Wenchang 19-1 platform (2020): “flange electrical isolation” retrofit. The previous metal serrated gasket + epoxy layer failed under salt-spray attack (potential difference >600 mV). After installing the complete C4430 Non-metallic Insulation Gasket set (G10 sleeve + ZPS outer ring), platform-to-ship potential difference dropped to <50 mV, cathodic-protection current demand fell 28 %, and yearly maintenance costs were cut by US $120 k.
Conclusion
Aramid fibre acts as the “rebar” inside the C4430 Non-metallic Insulation Gasket, delivering high strength, heat resistance and electrical insulation, while nitrile rubber behaves like “concrete”, providing elasticity, sealing and oil resistance. Hot-press vulcanisation fuses them into a “reinforced-concrete” structure, enabling the C4430 Non-metallic Insulation Gasket to meet ASME B16.5, BS 7531 Grade X and TA-Luft simultaneously under the combined stresses of hot water, steam, oil and electrical isolation, and giving it a proven service life two to three times longer than traditional non-asbestos gaskets.
Aramid fibre acts as the “rebar” inside the C4430 Non-metallic Insulation Gasket, delivering high strength, heat resistance and electrical insulation, while nitrile rubber behaves like “concrete”, providing elasticity, sealing and oil resistance. Hot-press vulcanisation fuses them into a “reinforced-concrete” structure, enabling the C4430 Non-metallic Insulation Gasket to meet ASME B16.5, BS 7531 Grade X and TA-Luft simultaneously under the combined stresses of hot water, steam, oil and electrical isolation, and giving it a proven service life two to three times longer than traditional non-asbestos gaskets.
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