PVMQ & PMQ Silicone: The Low-Temperature Solution Down to -100°C

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PVMQ (phenyl silicone) stays flexible down to -100°C — far below standard silicone’s -60°C limit.

It is the material engineers choose when seals must work in extreme cold: aerospace, arctic equipment, and outdoor systems that face deep-freeze conditions.

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What Are PMQ and PVMQ?

Both are members of the silicone family with phenyl groups added to the polymer chain:

  • PMQ — phenyl methyl silicone
  • PVMQ — phenyl vinyl methyl silicone (the more common, easier-to-process version used today)

Standard silicone (VMQ) is built from methyl and vinyl groups. Replacing some methyl groups with larger phenyl groups stops the rubber from crystallizing in extreme cold. The result: flexibility where other rubbers — and even standard silicone — turn hard and brittle.

In practice, when someone says “low-temperature silicone,” they usually mean PVMQ.

Why Cold Is a Problem for Rubber

Rubber seals work because they are flexible. Cold attacks this in two ways:

  1. Glass transition — below a certain temperature, rubber becomes glass-like and cracks.
  2. Crystallization — standard silicone slowly crystallizes around -50°C to -60°C and stiffens, even before glass transition.

A stiff O-ring cannot follow the surface it seals. The result is leakage — often only discovered when the equipment reaches the cold environment.

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Material

Practical Low-Temperature Limit

NBR (Nitrile)

about -30°C

FKM (Viton®)

about -20°C

VMQ (standard silicone)

about -60°C

PVMQ (phenyl silicone)

about -100°C

Key Properties of PVMQ

Property

Typical Value

Temperature range

-100°C to +180°C (compound dependent)

Hardness

Shore A 40 to 80

Compression set at low temp

Good

Weather / ozone / UV resistance

Excellent

Oil & fuel resistance

Poor (same as VMQ)

Cost

Higher than VMQ

Tips from ZSR: The exact low-temperature limit depends on the phenyl content of the compound. If your spec says “-100°C service,” tell us at inquiry — we select the compound grade to match, not just the material family.

Where PVMQ Is Used

  • Aerospace — seals for high-altitude and space-adjacent equipment, where -55°C and below is routine
  • Arctic and cold-climate equipment — outdoor machinery, sensors, and enclosures in polar regions
  • Refrigeration and cold chain — seals for deep-freeze and ultra-low temperature storage
  • Military and outdoor electronics — equipment that must start and seal at extreme cold

Where PVMQ Is NOT Needed

  • Normal cold (-40°C and up) — standard VMQ handles it. Do not pay for phenyl content you do not need.
  • Cold + oil contact — PVMQ’s oil resistance is as poor as VMQ’s. For oil in the cold, look at FVMQ (down to -60°C) and check your real temperature requirement.
  • Tight-budget general sealing — PVMQ costs more. Use it when the cold spec demands it.

Advice from ZSR: Check your real minimum temperature — not the worst case on paper, but what the seal actually experiences. Many “-100°C specs” we review turn out to be -55°C in reality, which standard VMQ handles at a fraction of the cost. We help you verify before you buy.

PVMQ vs VMQ vs FVMQ: Quick Comparison

VMQ

PVMQ

FVMQ

Low temp limit

-60°C

-100°C

-60°C

High temp limit

+200°C

+180°C

+175°C

Oil / fuel resistance

Poor

Poor

Excellent

Cost

Low

Medium–High

High

Best use

General sealing

Extreme cold

Oil + cold

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FAQ

A: Both are phenyl silicones. PVMQ contains vinyl groups, which make it easier to cure and process. Nearly all modern low-temperature silicone parts are PVMQ.

A: Yes, platinum-cured low-temperature compounds exist. But most PVMQ demand is industrial and aerospace. Tell us your certification need at inquiry.

A: Slightly lower mechanical strength, but for static sealing this rarely matters. Flexibility at temperature is what counts.

A: Yes. We compression-mold PVMQ into O-rings, gaskets, and custom shapes from your drawing or sample.

A: Ask for low-temperature retraction (TR-10) or brittleness test data on the compound. We can provide test results for the material we propose.

Need Seals for Extreme Cold?

ZSR molds low-temperature PVMQ silicone parts in-house. Tell us your real working temperature and environment — we will recommend the most cost-effective material that actually meets your spec.

Send your requirements. Answer within 24 hours.

🔒 Your design and data are protected under NDA.

Prefer Email? Send Inquiry to [email protected]

Related reading: What Is VMQ Silicone Rubber? | Fluorosilicone (FVMQ) Explained | Silicone O-Ring Material Selection Guide | Silicone Rubber Material Guide