Medium Flame Retardant Silicone Sponge

UL 94 HB Closed Cell Silicone Sponge Rubber

This medium density, closed cell flame retardant silicone sponge is a blue/grey color and is rated UL 94 HB. It is ideal for sealing and gasket applications where flame resistance and fire safety are a top priority. The material is produced with a fabric impression on both sides, is flexible and offers excellent compression set resistance.

KEY FEATURES

Blue/grey color
Flame retardant
Excellent for seals and gaskets
High compressibility
Low compression set
UV/Ozone resistant

SPECIFICATIONS

UL 94 HB

MATERIAL DETAILS

Available in – Continuous rolls or cut sheets
Thickness available (in) – 0.0625 to 0.500
Typical roll lengths (ft) – 25 to 100
Typical roll widths (in) – 36
Surface finishing – Fabric impression finish, both sides
Cell structure – Closed cell
Color – Blue/grey, others available

TEMPERATURE RANGE

-103°F to +450°F (-75°C to 232°C)

MATERIAL PROPERTIES

Properties
Compression deflection (25%)	psi (kPa)	6-14 (41-96)	ASTM D1056
Density < 0.25” thick	pcf (kg/m3)	43 (690) max.	ASTM D1056
Density ≥ 0.25” thick	pcf (kg/m3)	34 (550) max.	ASTM D1056
Compression set (22h, 100°C)	%	60% max.	ASTM D1056
Tensile strength	psi (kPa)	125 (862)	ASTM D412
Flammability	–	HB rating	UL 94

More information found on the full specification sheet. Go To Datasheets ➜

More Information

UL 94 HB

UL 94 HB is a is a safety and flammability standard by Underwriters Laboratories.
This material is compliant with the UL 94 HB test standard for flammability.
The horizontal burn test measures how quickly a horizontally oriented polymer specimen burns across when a flame is applied to one end of the sample.
In order for a material to be classified UL 94 HB, it must not have a burning exceeding 40 mm per minute over a 75 mm span for specimens having a thickness of 3.0 mm to 13 mm. For material with thickness less than 3mm the burning rate should not exceed 75mm per minute over a 75mm span. The material will also be rated as HB if it ceases to burn before the 100mm mark independent of thickness.