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Silicone & Fluorosilicone

Silicone (VMQ) and Fluorosilicone (FMQ) are Q-Group of elastomers where silicone is the main molecular chain and has one of the widest temperature range capabilities from a single elastomer compound.

What is VMQ/FVMQ?

VMQ (vinyl methyl silicone rubber) is a member of the Q-Group of elastomers where silicone is the main molecular chain and has one of the widest temperature range capabilities from a single elastomer compound.
Highly flexible, even at low temperatures, it has many compounding and processing options, including the ability to colour the compound more easily than with the other elastomer groups.
FVMQ (fluoro vinyl methyl silicone rubber, or fluorosilicone) adds fluorine at the molecular level to reduce the number of chemical reactions that can take place and significantly improves the chemical resistance compared to MVQ (although hot air capability is lowered).

Why use VMQ/FVMQ?

With a price range sitting between NBR and FKM materials, VMQ is often selected when either high/low temperature requirements exceed NBR capabilities, but fluid compatibility does not require FKM. VMQ also exhibits high physiological inertness (tasteless, odourless and non-toxic), inherent resistance to bacteria and fungal growth, and has high purity with low levels of extractables making it ideally suited to applications in the food, pharmaceutical and biomedical arenas. With better chemical resistance, FVMQ can be more widely specified, at a notably higher cost. All Q-Group materials have relatively poor mechanical properties, including tear strength and wear resistance, which coupled with a high coefficient of friction would generally mean it is only used for static applications.

Mouldings Garkets 2 Mouldings Garkets 2

When to use VMQ/FMQ

With good cold temperature flexibility and very good resistance to ozone, weathering and UV radiation, VMQ is often used in applications where the seal is exposed to the environment, or under extreme cold conditions where a degree of flexibility is required. It has good dielectric properties and resistance to high molecular weight, chlorinated aromatic hydrocarbons (including flame-resistant insulators, and coolant for electrical transformers). With moderate water resistance, high purity and cleanliness, and compatibility with diluted salt solutions and animal and vegetable oils, it's suitable for biomedical, food and beverage sealing applications. Temperature capability ranges from -54°C (-65°F) to +204°C (400°F) but special grades can reach as low as -115°C (-175°F) or up to 260°C (500°F). FVMQ is more chemically inert, providing improved fuel, mineral oil and low molecular weight aromatic hydrocarbon (such as benzene, toluene) resistance, but with a maximum temperature capability reduced to +175°C (350°F).

Standard VMQ/FVMQ materials

This is a small selection of our general purpose VMQ/FVMQ materials. Many more compounds are available and can be chosen to suit the specifics of the application.

The tensile strength and elongation are for specification purposes. Typical achieved values can be significantly higher.

Temperature range  is general recommendation for static application in air. Temperature ratings are subject to full application review.

Ceetak code
Material group
Hardness
(Shore A)
Colour
Tensile Strength
MPa min
Elongation at Break
% min
Recommended operating
temperature range
Callout ASTM D2000
L50CA29
FVMQ
50
Blue
6
150
-55°C to +175°C
-------------------------------------------------------
L60C344
FVMQ
50
Light Blue
4.8
150
-55°C to +175°C
-------------------------------------------------------
L70C247
FVMQ
70
Blue
6
150
-55°C to +175°C
M2 FK 706 A19 EF31 EO36 F19 Z1
S50CC08
VMQ
50
Red
7
400
-55°C to +205°C
-------------------------------------------------------
S60CA19
VMQ
60
Black
8
400
-50°C to +200°C
-------------------------------------------------------
S70C524
VMQ
70
Red
5
150
-55°C to +205°C
M2 GE 705 A19 B37 EA14 EO16 EO36 G11 F19

Want to Know More?

To discuss our materials further and get support with material selection for your application, please contact one of our application engineers.

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