To over come some of the weaknesses of conventional PTFE , scientists has developed the new chemically modified PTFE available as Dupont's Teflon Nxt or Dalkin's TFM and have improved some of the properties for the benefit of consumers.
Chemically Modified PTFE parts offers new opportunities for designing & engineering high performance products to get following working advantages.
Sr No. | Parameter | Standard | Conventional PTFE Value | Modified PTFE Value |
---|---|---|---|---|
1 | Colour | Visual | Milky White | Translucent White |
2 | Density | ASTM-D-792 | 2.1~2.2 gm/cc | 2.1~2.15 gm/cc |
3 | Tensile Strength | ASTM-D-638 | 200~300 kg/cm2 | 300~400 kg/cm2 |
4 | Elongation | ASTM-D-638 | 250~350% | 350~450% |
5.a | Compressive Strength at 1% Deformation | ASTM-D-695 | 35~40 kg/cm2 | 45~60 kg/cm2 |
5.b | Compressive Strength at 10% Deformation | ASTM-D-695 | 140~145 kg/cm2 | 170~200 kg/cm2 |
6 | Coefficient Of Friction | - | - | - |
A | Static | ASTM-D-1894 | 0.05 | 0.045 |
B | Dynamic | 0.04 | 0.035 | |
7 | Hardness | ASTM-D-2240 | 50~55 Shore D | 50~60 Shore D |
8 | Service Tempreature | ASTM-D-648 | - 200~+260℃ | - 200~+260℃ |
9 | Water Absorption | ASTM-D-570 | 0% | 0% |
10 | Dielectric Strength | ASTM-D-194 | 10~15 Kv/mm | 30~32 Kv/mm |
11 | Service Conditions (Properties) | -- |
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12 | Applications | -- | Gaskets, Bellows, Food/Contact and Medicine/Human Consumption Applications | Diaphragms, Components of Mechanical Seals, Vesel Lining. |
Permeant | Specimen Thickness, mm (in) |
Vapor | Liquid | Gas | |||
---|---|---|---|---|---|---|---|
PTFE | M-PTFE | PTFE | M-PTFE | PTFE | M-PTFE | ||
Perchloroethylene | 1 (0.04) | 5.5 | 2 | 13 | 4 | - | - |
Perchloroethylene | 2 (0.08) | 1.4 | 0.1 | 0.019 | 0.005 | - | - |
Perchloroethylene | 3 (0.16) | 0.08 | 0.05 | 0.006 | 0 | - | - |
Perchloroethylene | 4 (0.20) | 0.055 | 0.050 | - | - | - | - |
Hexane | 5 (0.08) | 3.4 | 0.2 | 23.4 | 0 | - | - |
Hexane | 6 (0.20) | 0.045 | 0.015 | - | - | - | - |
MEK | 7 (0.08) | ||||||
MEK | 8 (0.20) | 36.3 | 23.3 | 49.4 | 34.2 | - | - |
HCI, 20% | 9 (0.04) | 0.4 | 0.1 | - | - | - | - |
Helium | 10 (0.08) | - | - | - | - | 93 | 1 |
Helium | 11 (0.20) | - | - | - | - | 0.18 | 0.12 |
M-PTFE Components as per specific sizes / drawing & in standard - Filled compositions can be available, subject to minimum order quantity.
There are various Virgin and Filled grades available in m-PTFE, subject to minimum order quantity.