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C4400 Dielectric Flange Gasket
QS Gasket: C4400 Dielectric Flange Gasket
Name: C4400 Dielectric Flange Gasket
Standard: ASME B16.5
Material: Klingersil C4400
Max Temperature: 400℃
Size: 4 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 C4400
Max Temperature: 400℃
Size: 4 Inch
Pressure: 150LB
Complete Set: with G10 Sleeve and Washers and ZPS
Compound: with Aramid Fiber Reinforced with a Nitrile Binder
Quantity
C4400 Dielectric Flange Gasket adopts imported Klingersil C4400 asbestos-free sheet, aramid fiber + NBR composite, withstands 400 °C under full duty without puncture; G10 insulating sleeves, washers and ZPS metal hardware all supplied in one 4"150 LB kit to ASME B16.5. Install once and you gain double insurance—electrical isolation plus sealing—first choice for petrochemical, marine and electrolyzer projects.
C4400 vs. C4430 – how to choose?
Both give electrical isolation in 4"150 LB insulating flange kits, yet engineers often hesitate. The key figures, pros & cons and typical cases are compared below so you can match your duty in seconds.
Both give electrical isolation in 4"150 LB insulating flange kits, yet engineers often hesitate. The key figures, pros & cons and typical cases are compared below so you can match your duty in seconds.
1. Material & construction
C4400 Dielectric Flange Gasket: premium aramid fiber + NBR, density 1.6 g/cm³, gold or green face.
C4430: aramid + glass micro-fiber + NBR, density 1.65 g/cm³, 3XA anti-stick coating both sides.
→ Glass micro-fiber makes C4430 slightly cheaper but raises water absorption (10.6 % vs <5 % for C4400 Dielectric Flange Gasket).
C4400 Dielectric Flange Gasket: premium aramid fiber + NBR, density 1.6 g/cm³, gold or green face.
C4430: aramid + glass micro-fiber + NBR, density 1.65 g/cm³, 3XA anti-stick coating both sides.
→ Glass micro-fiber makes C4430 slightly cheaper but raises water absorption (10.6 % vs <5 % for C4400 Dielectric Flange Gasket).
2. Temperature ceiling
C4400 Dielectric Flange Gasket: 400 °C continuous, 150 °C recommended for steam.
C4430: 250 °C continuous, up to 200 °C in steam.
→ If the line may see heat-transfer oil or hot medium above 250 °C, choose C4400 Dielectric Flange Gasket; for saturated steam below 200 °C C4430 is more economical.
C4400 Dielectric Flange Gasket: 400 °C continuous, 150 °C recommended for steam.
C4430: 250 °C continuous, up to 200 °C in steam.
→ If the line may see heat-transfer oil or hot medium above 250 °C, choose C4400 Dielectric Flange Gasket; for saturated steam below 200 °C C4430 is more economical.
3. Sealing & stress relaxation
C4400 Dielectric Flange Gasket: compression 8 %, recovery >50 %, stress relaxation 16 % (300 °C×16 h).
C4430: compression 9 %, recovery ≈50 %, stress relaxation 35 MPa (same test).
→ C4400 Dielectric Flange Gasket stays “stiffer” at high T, ideal for cyclic loads such as heat exchangers; C4430 needs lower initial bolt load, friendly for manual pump/valve maintenance.
C4400 Dielectric Flange Gasket: compression 8 %, recovery >50 %, stress relaxation 16 % (300 °C×16 h).
C4430: compression 9 %, recovery ≈50 %, stress relaxation 35 MPa (same test).
→ C4400 Dielectric Flange Gasket stays “stiffer” at high T, ideal for cyclic loads such as heat exchangers; C4430 needs lower initial bolt load, friendly for manual pump/valve maintenance.
4. Electrical performance
Dielectric strength: C4400 Dielectric Flange Gasket 19 kV/mm, C4430 21 kV/mm; both pass 6 kV spark test.
Water-absorption difference causes C4430 insulation to drop faster in wet service; coastal or buried duties favour C4400 Dielectric Flange Gasket.
Dielectric strength: C4400 Dielectric Flange Gasket 19 kV/mm, C4430 21 kV/mm; both pass 6 kV spark test.
Water-absorption difference causes C4430 insulation to drop faster in wet service; coastal or buried duties favour C4400 Dielectric Flange Gasket.
5. Chemical compatibility
Resistance to oils, fuels, weak acids/bases is similar; glass fiber lowers C4430 tolerance to HF and strong alkalis. HF alkylation units must use C4400 Dielectric Flange Gasket.
Resistance to oils, fuels, weak acids/bases is similar; glass fiber lowers C4430 tolerance to HF and strong alkalis. HF alkylation units must use C4400 Dielectric Flange Gasket.
6. Certifications & industry acceptance
C4400 Dielectric Flange Gasket: DVGW, SVGW, TA-Luft, Germanischer Lloyd; common in steam, gas turbines, nuclear auxiliaries.
C4430: WRc potable water, AGA class 3 gas, BS 5146 fire; mostly used in water, fire-water lines.
C4400 Dielectric Flange Gasket: DVGW, SVGW, TA-Luft, Germanischer Lloyd; common in steam, gas turbines, nuclear auxiliaries.
C4430: WRc potable water, AGA class 3 gas, BS 5146 fire; mostly used in water, fire-water lines.
7. Price & availability
For 1.5 mm thickness C4430 is ~18 % cheaper than C4400 Dielectric Flange Gasket; domestic stock is mainly 1.5 m × 2 m sheets, C4430 ex-stock saves about two weeks for rush orders.
For 1.5 mm thickness C4430 is ~18 % cheaper than C4400 Dielectric Flange Gasket; domestic stock is mainly 1.5 m × 2 m sheets, C4430 ex-stock saves about two weeks for rush orders.
8. Selection examples
1) Offshore platform 4"150 LB fire-sea water line: 20–40 °C year-round, electrical isolation + fire requirement, budget sensitive → C4430.
2) Refinery 4"150 LB thermal-oil tracing: 320 °C operating, 380 °C steam-out → must be C4400 Dielectric Flange Gasket.
3) City gas regulating station 4"150 LB: 0.8 MPa, 10–60 °C, needs AGA approval → C4430 adequate and cheaper.
4) Battery plant clean steam 4"150 LB: purity demands no glass fiber release → C4400 Dielectric Flange Gasket.
1) Offshore platform 4"150 LB fire-sea water line: 20–40 °C year-round, electrical isolation + fire requirement, budget sensitive → C4430.
2) Refinery 4"150 LB thermal-oil tracing: 320 °C operating, 380 °C steam-out → must be C4400 Dielectric Flange Gasket.
3) City gas regulating station 4"150 LB: 0.8 MPa, 10–60 °C, needs AGA approval → C4430 adequate and cheaper.
4) Battery plant clean steam 4"150 LB: purity demands no glass fiber release → C4400 Dielectric Flange Gasket.
Conclusion
“High temperature, high cycle, strong corrosion, long life” – four-high duties choose C4400 Dielectric Flange Gasket;
“Ambient temperature, ambient pressure, tight budget, fast delivery” – three-normal & one-fast duties, C4430 is more cost-effective.
Draw the temperature line at 250 °C, add medium and certification needs, and the two materials split almost instantly.
“High temperature, high cycle, strong corrosion, long life” – four-high duties choose C4400 Dielectric Flange Gasket;
“Ambient temperature, ambient pressure, tight budget, fast delivery” – three-normal & one-fast duties, C4430 is more cost-effective.
Draw the temperature line at 250 °C, add medium and certification needs, and the two materials split almost instantly.
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