SILASTIC™ LS-4940 Fluorosilicone Rubber

What is SILASTIC™ LS-4940 Fluorosilicone Rubber?

Developed to provide good handling in combination with high-temperature resistance and fluid resistance, this product is a 40 Durometer, Fluorosilicone Rubber Base specially designed for calendering and extrusion of turbocharger hoses. They also are suitable for molded parts requiring higher heat stability and/or improved fluid stability.

Uses

Molded, extruded and calendered goods

Benefits

Good balance of tensile, elongation and tear resistance
Good heat stability with good tear retention
Low compression set
High fuel resistance
Compound flexibility by application
Reduced stickiness when unwrapping and mill-handling

Properties

Application Benefits
Rebound Resilience	12 %
Use	Engine Systems

As Cured
Durometer/Hardness, JIS Type A	40.6
Tensile Strength	11.1 MPa

Typical Properties
Elongation	610 %
Functionality	Fluorosilicone Rubber Compound
Hardness	38 Shore A
Tensile Strength JIS#3	10.6 MPa
Young Modulus	.68 MPa

Rolling mills in the Silastic Building at the Midland Plant roll out sheets of Silastic silicone rubber in early 1953 photo by Jim Dion. Photo used in 50th Anniversary Book. Production areas / Midland Plant, Michigan, USA,

Mill Handling Performance – Historic SILASTIC™ FSR Base (40 durometer).

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Mill Handling Performance – SILASTIC™ LS-4940 FSR Base (40 durometer).

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SILASTIC™ LS-4940 Fluorosilicone Rubber

What is SILASTIC™ LS-4940 Fluorosilicone Rubber?

Uses

Benefits

Properties

Application Benefits

As Cured

Typical Properties

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