|
7108
S. Alton Way, Unit I |
Basic
Information
Home
Contact Information
Quality Policy
Terms & Conditions
Kalrez O-rings
Seals
Kalrez o-rings, seals
Critical
properties
Compatibility
chart
Zalak
seals
Availability
of parts
Kalrez
industries
Chemical
process
Semiconductor
Ultrapure
TriLobe
seal
Pharma
and food
Kalrez Sanitary
seals
FDA
compliance
Oil
and gas
Kalrez
news
Kalrez
news archive
Viton O-rings Seals
Viton o-rings, seals
Simriz
O-rings Seals
Simriz o-ring,
seal
Metal
Detectable Seals
Metal
detectable
Elastomers
Elastomers
Elastomer properties
Environment
Physics of rubber
Hardness
Tensile stress
Bulk modulus
Compression set
Stress relaxation
Shear modulus
Abrasion
Miscellaneous
High pressure
Vacuum performan.
Thermal stablility
Chemical compatibil.
Fluid compatibility
Mechanical
Seal Design
Operating principles
Classification
Application limits
Drive mechanisms
Loading devices
Mating ring types
Gland design
O-ring, Seal Design
O-ring, seal design
O-ring,
seal failure
PSP o-ring sizes
Products
Products
Industries
Industries
Miscellaneous
Problems solved
O-ring, seal tips
Glossary
of terms
(303) 758-2728
Home > Elastomer Properties > Thermal Stability
Seal Thermal Stability
Low Temperature Seal Thermal Stability
The low-temperature limit is generally 15°F below TR-10 for static seals. For dynamic seals the TR-10 is more relevant. The TR-10 is the temperature at which an elastomer is able to retract 10%.
Low-temperature performance is generally a reversible process.
For design purposes compression is generally increased. The chemical media may cause swelling which may act as a plasticizer and lower the service temperature.
Definition of:
Glass Transition Temperature:
Thermal Expansion
| Material | Units | Therm. Stab. | x10–5 /°C |
x10–6 /°F |
| FKM | 200°C | 16 | 90 | |
| NBR | 120°C | 23 | 62 | |
| VMQ | 230°C | 59–79 | 103 | |
| FFKM | 300°C | 23 | ||
| EPDM | 150°C | 16 | ||
| Stainless | – | 1.04 | ||
| Aluminum | – | 1.3 | ||
| TFE and FEP | 230°C | 5–8 | ||
| KEL-F | 280°C | 4–7 | ||
| Polyimide | 275°C | 5 |
| Thermal
Conductivity (g-cal/sec/cm2/cm/C) |
Specific
Heat (cal/g/C) |
|
| VMQ | 0.330–0.515 x 10–3 | 0.28–0.35 |
| SC1030/SC1020 | 0.6/0.8 x 10–3 | 0.2 |
High Temperature Seal Thermal Stability
The high-temperature limit for seal thermal stability is generally considered a 30–50% loss of physical properties and typically represents a maximum temperature for 1,000 hours continuous service. It represents an irreversible change in the backbone or cross-link network.
The effect of high temperature can be compounded by the interaction with the chemical media. Chemical reactions typically double with a 10°C increase in temperature.
Definition of:
- Thermal Conductivity: ASTM C177, C518
- Thermal Expansion: ASTM D864
- Heat Aging: ISO 188, ASTM D454, D572, D573, D865
Viton® was a registered trademark of DuPont at the time the article was written and is now a registered trademark of the Chemours Company.
Next topic Chemical Seal: Chemical Compatibility
We are located in the Denver Technological
Center in a suburb of Denver, Colorado
©1997-2017, Problem Solving Products, Inc.
Website Map | Privacy Statement
| Terms of Use