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Asahi/America valve gaskets offer a unique double convex ring design that gives optimum sealing with only one third the torque commonly required with flat faced gaskets. Asahi offers EPDM gaskets from 1/2" to 12"; PTFE-bonded EPDM gaskets in sizes from 1/2" to 12"; and PVDF-bonded EPDM gaskets from 1/2" to 10".
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EPDM - durometer A, hardness 65 - 68
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PTFE or PVDF-bonded EPDM for maximum corrosion resistance
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Perfect sealing at low bolt tightening torque ratings; longer gasket life
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Ideal for plastic piping systems, as well as metal or plastic-lined metal systems
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Working temperature:
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Approximately tne third bolt tightening torque ratings as compared with flat or envelope type gasket
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Thickness of bonded materials
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PTFE: All Sizes: 0.016" (0.4mm)
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PVDF:Sizes 1/2" - 2": 0.016" (0.4mm)
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PVDF:Sizes 3" - 10": 0.020" (0.5mm)
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PTFE-bonded gasket excellent for most corrosive chemicals
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PVDF-bonded gasket is ideal for the following:
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Semi-conductor industry, because of its purity
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Aggressive chemicals (strong acids, bases, halogens, etc.)
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Media that generates any volatile gas (PVDF gas permeation is only 1/50 of PTFE)
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Both the PTFE and PVDF-bonded gaskets employ a proprietary laminating process for bonding to EPDM, providing the greater elasticity required for lower sealing torques
| FULL FACE TYPE |
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| ANSI/ASME B16.5 CLASS 150 |
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| DN |
D1 |
D2 |
D3 |
n |
e |
d1 |
d2 |
| 15 |
0.7 |
2.4 |
3.4 |
4 |
0.6 |
1 |
1.6 |
| 20 |
0.9 |
2.8 |
3.8 |
4 |
0.6 |
1.3 |
1.9 |
| 25 |
1.2 |
3.1 |
4.2 |
4 |
0.6 |
1.5 |
2.1 |
| 30 |
1.5 |
3.5 |
4.5 |
4 |
0.6 |
2 |
2.6 |
| 40 |
1.7 |
3.9 |
4.9 |
4 |
0.6 |
2.1 |
2.7 |
| 50 |
2.1 |
4.7 |
5.9 |
4 |
0.8 |
2.7 |
3.3 |
| 65 |
2.7 |
5.5 |
6.9 |
4 |
0.8 |
3.4 |
4 |
| 80 |
3.2 |
6 |
7.4 |
4 |
0.8 |
3.9 |
4.4 |
| 100 |
4 |
7.5 |
8.9 |
8 |
0.8 |
4.7 |
5.4 |
| 125 |
5 |
8.5 |
9.9 |
8 |
0.9 |
5.7 |
6.5 |
| 150 |
5.9 |
9.5 |
10.9 |
8 |
0.9 |
6.6 |
7.5 |
| 200 |
7.8 |
11.8 |
13.4 |
8 |
0.9 |
8.5 |
9.7 |
| 250 |
9.8 |
14.3 |
15.9 |
12 |
1 |
10.6 |
12.1 |
| 300 |
11.8 |
17 |
18.9 |
12 |
1 |
12.8 |
13.9 |
| 350 |
13.9 |
18.7 |
20.9 |
12 |
1.14 |
14.6 |
15.4 |
| 400 |
15.6 |
21.2 |
23.4 |
16 |
1.14 |
17.3 |
18.5 |
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