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Description
Expanded PTFE gasket sheet is made of 100% expanded P.T.F.E. by using special process that produces a uniform and highly fibrillated microstructure with a great lot of fibers running in multi direction. These create a soft and pliable, yet very tough gasket that has excellent resistance of pressing, creep relaxation and cold flow.
Expanded PTFE sheet possesses universal resistance against common chemicals, except melted alkali metal, fluorine at liquid and gas states. It can be stored without any time limits and can seal uneven and damaged flanges
Application
Expanded PTFE Sheet is a high performance sheet gasket material made of multi-directionally expanded virgin PTFE. It is a soft, form-in-place gasket material that conforms to almost any sealing surface. It is capable of withstanding a wide range of pressure, temperature and chemical environments. Due to its highly fibrillated microstructure, it has excellent creep resistance compared with other PTFE products.
Typical Application
> Distilleries, petrochemical, food and beverage, pharmaceutical, general chemical, power generation, iron and steel manufacturing, pulp and paper, etc.
Specification
Physical Properties of expanded PTFE sheets
|
ITEM |
Standard |
Value |
|
PH |
- |
0~14 |
|
Temperature |
- |
-240~260°C |
|
Recovery |
JB/T10688-2006 >10% |
15% |
|
Compressibility |
JB/T10688-2006 40%~50% |
45% |
|
Creep |
- |
14% |
|
Compressive Strength |
- |
17.0MPa |
|
Tensile Strength |
- |
15Mpa |
|
Leakage rate |
JB/T10688-2006 <0.1x10-3 |
0.1~0.2x 10-4 cm³/s |
|
Density |
0.7~0.85g/cm³ |
0.85g/cm³ |
|
Thickness (mm) |
Tolerance (mm) |
Size (mm) |
Tolerance (mm) |
|
0.5 |
±0.10 |
1500X1500 |
±10 |
|
1.0 |
±0.15 |
||
|
1.5 |
±0.20 |
||
|
2.0 |
±0.20 |
||
|
3.0 |
±0.30 |
||
|
4.0 |
±0.30 |
||
|
5.0 |
±0.30 |
||
|
6.0 |
±0.30 |
Specification of different modified PTFE sheet
|
PRODUCT |
FILLER |
airtightness,，L/min |
creep relaxation ,% |
compressibility,% |
compressional resilience,% |
tensile strength,MPa |
|
|
Garlock |
GYLON 3504 |
Glass beads |
<0.015 |
40 |
25-45 |
30 |
14 |
|
GYLON 3510 |
barium sulfate |
<0.015 |
11 |
4-10 |
40 |
14 |
|
|
Flexitallic |
SIGMA 500 |
Glass beads |
<0.1 |
31 |
35 |
44 |
14 |
|
SIGMA 511 |
silicon dioxide |
<0.1 |
35 |
7 |
44 |
16 |
|
|
Durlon |
9200W |
barium sulfate |
0.01 |
30 |
8-16 |
35 |
13.2 |
|
9400 |
carbon fiber |
0.01 |
30 |
5-12 |
40 |
14.5 |
|
|
VALQUA |
7020 |
ceramic fiber |
- |
48 |
4.6 |
59 |
15.2 |
|
7026 |
carbon fiber |
- |
49 |
4.5 |
73 |
26.5 |
|
|
Sealgood |
A |
ceramic fiber |
<0.1 |
78 |
6 |
49 |
15.7 |
|
B |
Glass beads |
0.25 |
74 |
21.4 |
33.9 |
12.3 |
|
|
C |
- |
- |
62.8 |
9.6 |
38.9 |
12.4 |
|
|
self made |
ceramic fiber |
<0.01 |
16.6 |
12.5 |
60 |
14.8 |
|
|
Ordinary PTFE |
- |
<0.01 |
81 |
16.7 |
47 |
25.4 |
|
|
remark |
|
ASTM F37 |
ASTM F38 |
ASTM F36 |
ASTM F152 |
||
Feature
1.Made of 100% multi-directional fiber PTFE
2.Clean and no toxic, soft and flexible
3.Reduced creep relaxation,chemical resistant
4.Cost saving;easy cut into gasket
5.Acid and alkali resistant
6.Non-viscous, no aging