Temperature stability
Silicone is considered where flexibility and sealing behaviour must be retained across a wide operating-temperature window, subject to compound review.
Silicone (VMQ) compound
Industrial silicone rubber
A technical reference for Hamta Polymer silicone (VMQ) compounds from 20 to 80 Shore A. Silicone is widely assessed for broad temperature range, weather resistance and electrical-insulation requirements. Food, pharmaceutical or medical contact is never implied by this page and needs an approved, application-specific grade.
-60 to +230 C
Typical service temperature
Excellent
Weather resistance
7
Standard hardness grades
Strong
Electrical insulation
Weather-facing components
Its resistance to ozone, UV and weathering makes silicone relevant to outdoor and environmental-sealing applications.
Approval is application-specific
A food, pharmaceutical or medical-contact statement requires a separately approved material grade and evidence; it is not implied by the base polymer family.
Hamta Polymer Silicone (VMQ) general specifications
Chemical namePolydimethylsiloxane (VMQ)
Standard designationVMQ / MQ / PMQ (ASTM D1418)
Available hardness range20 to 80 Shore A
Typical continuous service range-60 to +230 C, depending on compound and application
Weather resistanceExcellent resistance to UV, ozone and general weather exposure
ColourTranslucent, white or grey; subject to formulation
Specific gravity1.07 to 1.23 g/cm3, depending on formulation and hardness
Technical datasheet
Silicone (VMQ) datasheet by hardness
Choose a hardness grade to view the recorded mechanical properties, units and test references.
| Property | Symbol | Unit | Value | Standard |
|---|---|---|---|---|
| Hardness | H | Shore A | 50 +/- 5 | ASTM D2240 / ISO 7619 |
| Tensile strength | TS | MPa | >= 6.6 | ASTM D412 / ISO 37 |
| Elongation at break | EB | % | >= 350 | ASTM D412 / ISO 37 |
| 100% modulus | M100 | MPa | 0.7-1.4 | ASTM D412 / ISO 37 |
| Tear resistance | TR | kN/m | >= 16 | ASTM D624 / ISO 34 |
| Compression set (175 C / 22 h) | CS | % | 10-18 | ASTM D395-B / ISO 815 |
| Resilience | R | % | 45-60 | ISO 4662 |
| Specific gravity | rho | g/cm3 | 1.15 +/- 0.05 | ASTM D792 / ISO 2781 |
| Dielectric strength | Eb | kV/mm | >= 19 | ASTM D149 / IEC 60243 |
| Dielectric constant (1 MHz) | epsilon | - | 3.0-3.4 | ASTM D150 |
| Typical service temperature | T | C | -60 to +220 | - |
Silicone (VMQ) chemical-resistance guidance
This is an orientation aid, not a final compatibility approval. Confirm the specific medium, concentration, temperature and exposure cycle with the technical team.
Weather and environmental exposure
Ozone, sunlight and general weatheringExcellent
Outdoor environmental exposureExcellent
Temperature and electrical applications
Elevated-temperature dry-air service subject to compound reviewExcellent
Electrical insulation duties within the reviewed designExcellent
Water and selected aqueous media
Water and aqueous media subject to temperature reviewGood
Low-temperature flexibility requirementsExcellent
Oils, fuels and aromatic solvents
Mineral oils and hydrocarbon fuelsPoor
Aromatic solventsPoor
Excellent
Good
Fair
Poor
Technical notes and limitations
1
Values are typical laboratory guidance for the stated methods. Finished-part results can vary with formulation, cure, geometry and production conditions.
2
Silicone is not a default material for fuel, mineral oil or aromatic-solvent exposure. Assess an alternative family such as FVMQ, NBR or FKM against the actual medium.
3
Electrical performance must be checked on the finished insulation system, including geometry, voltage, environment and relevant applicable standards.
4
Food, pharmaceutical and medical-contact suitability is not implied. It needs a specified approved grade and the necessary evidence before any public claim or use.
Where is Silicone (VMQ) considered in our product range?
These product families can be explored from the English product hub. Suitability is determined by the final application, not by the material code alone.
Need help selecting a silicone grade?
Share the medium, temperature range, electrical or environmental conditions, dimensions and target quantity with Hamta Polymer for an application-specific discussion.