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VMQ
Material Type
Rubber
Material Full Name
Vinyl Methyl Silicone
Process Compatibility
Injection Molding, Compression Molding
Basic Properties
Property |
Parameter/Performance |
Remarks |
|---|---|---|
| Chemical Name | Vinyl Methyl Silicone | Si-O-Si backbone with methyl/vinyl side groups |
| Molecular Structure | Semi-inorganic elastomer | Far exceeds organic rubbers in temperature resistance |
| Density | 0.95~1.10 g/cm³ | Lighter than most rubbers (80% of NR weight) |
| Color | Transparent to translucent (colorable) | Medical/food grades are optically clear |
| Mechanical Properties | ||
| – Tensile Strength | 4-12 MPa (unfilled)/8-15 MPa (filled) | Even reinforced, weaker than organic rubbers |
| – Elongation at Break | 200-800% | Ultra-high elasticity (rebound >90%) |
| – Tear Strength | 10-30 kN/m | Requires special fillers (e.g., fumed silica) |
| Thermal Properties | ||
| – Service Temperature | -100℃~250℃ (short-term 300℃) | Best low-temp performance (Tg: -120℃) |
| – Flammability | LOI 25-35% (self-extinguishing) | Non-toxic combustion (only SiO₂/CO₂) |
| Chemical Properties | ||
| – Weatherability | Excellent (>20 years outdoor) | No anti-ozonants needed |
| – Chemical Resistance | Resists water/alcohols/weak acids; degrades in strong acids/alkanes/alkalis | Avoid conc. H₂SO₄/NaOH |
Processing Characteristics
No Mastication:
- Mooney viscosity ML(1+4)25℃: 10-50 (excellent flow)
Curing Systems:
- Peroxide curing (DCP/DCBP, 160-180℃×5-10 mins)
- Platinum-catalyzed (food/medical grade, odorless)
Molding Processes:
- Compression (most common)
- Extrusion/dipping (for LSR)
Common Application Areas
-
Medical: Artificial heart valves, prosthetics
-
Food: Baking molds, baby bottle nipples
-
Electronics: Keypad contacts, waterproof seals
-
Aerospace: Engine seals, spacecraft thermal barriers
VMQ Modified Types
Type |
Vinyl Content |
Characteristics |
Typical Applications |
|---|---|---|---|
| Standard VMQ | 0.1-0.3% | General purpose, low cost | O-rings, keyboard pads |
| High-Clarity VMQ | 0.05-0.1% | >90% light transmittance | Baby nipples, medical tubes |
| High-Tear VMQ | 0.3-0.8% | Tear strength >40 kN/m | Aerospace seals, pressure cooker gaskets |
| Conductive VMQ | – | Volume resistivity 10³-10⁶ Ω·cm (CNT filled) | Anti-static rollers, EMI shielding |
| Medical VMQ | – | USP Class VI / ISO 10993 compliant | Implants, prosthetic fillers |
Advantages & Disadvantages
Advantages |
Disadvantages |
|---|---|
| Widest temp range (-100℃~250℃) | Low mechanical strength (needs fillers) |
| Non-toxic/biocompatible (medical) | Poor oil/solvent resistance |
| Permanent elasticity (<10% compression set) | Expensive (5-10× NR cost) |
Other Elastomer & Rubber Material Selection
NR Rubber
PU Rubber
IIR Rubber
FKM Rubber
TPU Rubber
FAQ Of VMQ Materials
Visit our FAQ center for more questions.
What are the most prominent features of VMQ rubber?
VMQ (Vinyl Methyl Silicone Rubber) exhibits an extremely broad operating temperature range (-60℃~250℃), outstanding high/low-temperature resistance, electrical insulation (volume resistivity >10¹⁵Ω·cm), and physiological inertness, though with relatively low mechanical strength (tensile strength 4~8MPa).
Why is VMQ rubber preferred in medical and food industries?
Due to its FDA/USP Class VI compliance:
- Non-toxic extractables
- Withstands autoclaving (121℃ steam)
- Hydrophobic surface resists microbial adhesion
What are VMQ's specialized industrial applications?
• Aerospace: Seals (resists -70℃~200℃ thermal shock)
• Renewable energy: PV module encapsulation (30-year UV resistance)
• Electronics: Conductive keypads (adjustable resistivity 10³~10⁶Ω)