CHYGRATM Spiral Wound Gaskets can be used to seal fluid pressure up to 250 bar cryoprnices temperature as low as -200C and up to elevated temperature of 1000C. Products are widely used in the oil, gas, petrochemical process and engineering industries.
Spiral wound gaskets type:
Type Thickness(mm)
Basic form 3.2 4.5
With inner ring 4.5
With outer ring 4.5
With inner and outer ring 4.5

Structure type:
Filler Hoop Inner ring Outer ring
Asbestos SUS 304 Carbon steel Carbon steel
Graphite SUS 316 SUS 304 SUS 304
PTFE SUS 316L SUS 316 SUS 316
SUS 316L SUS 316L

The table below may be used for selected material of inner ring and winding metal.
Trade name AISI Hardness(HB/HV) Temperature(C)
Stainless steel 304 304 130~180 -250~+550
Stainless steel 316 316 130~180 -100~+550
Stainless steel 316L 316L 130~190 -100~+550

The outer ring is generally manufactured from carbon steel with an anti-corronsion treatment.

The table below may be used for determining the correct filler.
Filler material Temperature(C) Max operating pressure(kg/cm2)
Graphite -200~550 250
Asbestos -150~450 100
PTFE -240~260 100

Flange type and Spiral Wound Gasket form
Flange type Spiral Wound Gasket form
Flat face flange(F. F) Gasket with an outer ring
Gasket with an inner and outer ring
Raised face flange(R. F) Gasket with an outer ring
Gasket with an inner and outer ring
Male and female flange(M & F) Basic form gasket
Gasket with an inner ring
Tongue and groove flange(T & F) Basic form gasket
Gasket with an inner ring
Flat and groove flange(F & G) Basic form gasket
Gasket with an inner ring

Tolerances of thickness
Item Thickness(mm) Tolerances(mm)
Gasket thickness 4.5, 3.2 +0.2
-0.1
Ring thickness 3.0 +/-0.24

The table below specifies the production diameter tolerance (Nominal pipe diameter for flanges in accordance with):
DIN (mm) ANSI B16.5
BS1560 (mm)
Mss sp-44 API 605 Tolerances
Inner ring I. D.
Gasket I. D. <=600 <=24" >=26" and <=34" +/-0.5
>600 and <=800 >24" and <=34" >=36" and <=60" +/-0.9
>800 and <=1600 >34" and <=60" +/-1.3
>1600 >60" +/-1.6
Gasket O. D. <=600 <=24" <=24" +/-0.9
>600 and <=1600 >24" and <=60" >24" and <=60" +/-1.8
1600 >60" +/-2.2
Outer ring O. D >=1/2" and <=60" +/-0.9
<=600 <=24" 0-1.0
>600 and <=1000 >24" and <=34" 0-1.8
>1000 and <=1600 >34" and <=60" 0-2.2

Note: 1. We also can produce according to JIS. JPI standards or client request.