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Products Description
| PTFE | ||||
| Property | Unit | Test Method | Test Parameter | Value |
| Hardness | Shore D | ASTM D2240 | (Shore D - 15 sec) | 60 |
| Specific gravity | g/cm3 | ASTM D792 | 2.18 | |
| Tensile strength | MPa | ASTM D638 | Microtensile specimen of ASTM D1708, speed of testing 0.8mm/s |
26.5 |
| Ultimate elongation | % | ASTM D638 | Microtensile specimen of ASTM D1708, speed of testing 0.8mm/s |
300 |
| Modulus of Elasticity | MPa | ASTM D638 | 280 | |
| Coefficient of thermal expansion from 25 to 100°C |
°C-1 | ASTM E 831 | 16x10-5 | |
Introduction
Diaphragm seals, also known as chemical seals or gauge isolators, protect pressure-measuring instruments from hot, clogged, corrosive, sanitary, or other process fluids that threaten the instrument. The seal's flexibility is that the diaphragm securely seals the contents while penetrating the instrument for accurate pressure measurement.
Diaphragm seals are used to seal and protect instruments from process media and are flexible membranes that seal and insulate housings. The flexible nature of this seal allows pressure effects to pass through the barrier, but not through the contained material. Diaphragm seals are typical in healthcare and medical applications such as respiratory equipment such as spirometers, ventilators, air mixers, anesthesia equipment, blood analyzers, and hygienic pharmaceutical applications.
Application
Diaphragm seals are used in various medical, pharmaceutical, and biotechnological applications, especially in low-pressure valves. In a typical valve application, the diaphragm's sealing bead seals the valve when the valve is in the rest position, similar to a static gasket or O-ring. The actuator lifts the diaphragm, opening the valve to allow fluid flow; when the actuator is de-energized, a spring is typically used to return the diaphragm to its resting position.
Typical healthcare and medical applications for diaphragm seals: Respiratory equipment such as spirometers, ventilators, air mixers, anesthesia equipment, blood analyzers, and hygienic pharmaceutical applications.

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