Bellofram Closed Cell Silicone Sponge Extrusion Products

Bellofram Silicones extruded closed cell silicone sponge profiles are used when difficult sealing problems require a combination of complex gasket shapes and extreme flexibility. Our full in-house die making capabilities allow us to produce cords, rectangles, tubes, and any other complex geometries.  Our in-house mixing provides a choice of materials with a wide compression deflection rating, ranging from ASTM D 1056 2D1 soft density to ASTM D 1056 2D5 extra firm density.  The self-forming skin enhances the profile’s water absorption resistance. Need to meet a BMS requirement?  No problem! Bellofram Silicones is a certified supplier of BMS 1-23 and BMS 1-60 products. We offer a flame retardant version in each density range that will make sealing possible in extreme environments. A fully approved NSF 51 version produced with FDA ingredients is also available, in applications where FDA compliance is required. Our Bellofram Silicones extruded closed cell silicone sponge profiles are available in any color to aide to the aesthetics of your assembly.  Contact us today for a product sample or a quote.

MATERIAL PROPERTIES FOR CLOSED CELL SILICONE SPONGE EXTRUDED PRODUCTS
COMPOUND ASTM D 1056 DESIGNATION COMPRESSION DEFLECTION (PSI) HEAT AGE
22 hours @ 150° C
WATER ABSORPTION COMPRESSION SET
22 hours @ +100°C
LOW-TEMPERATURE FLEX
5 hours @ -55°C
5104 ASTM D 1056 2D1 2 – 5 Change in
Compression Deflection ±5%
10% MAX 30% max PASS
5204 ASTM D 1056 2D2 5 – 9 27% max PASS
5304 ASTM D 1056 2D3 9 – 13 25% max PASS
5404 ASTM D 1056 2D4 13 – 17 25% max PASS
5504 ASTM D 1056 2D5 17 – 25 22% max PASS
MATERIAL PROPERTIES FOR FLAME RETARDANT SILICONE SPONGE EXTRUDED PRODUCTS
COMPOUND ASTM D 1056 DESIGNATION COMPRESSION DEFLECTION (PSI) HEAT AGE
22 hours @ +150° C
WATER ABSORPTION COMPRESSION SET
22 hrs @ +100°C
LOW-TEMPERATURE FLEX
5 hours @ -55°C
MEETS BURN REQUIREMENTS
OF UL 94 V-0
5109 ASTM D 1056 2D1 2 – 5 Change in Compression Deflection ±5% 10% MAX 35% max PASS PASS
5209 ASTM D 1056 2D2 5 – 9 35% max PASS PASS
5309 ASTM D 1056 2D3 9 – 13 35% max PASS PASS
5409 ASTM D 1056 2D4 13 – 17 35% max PASS PASS
5509 ASTM D 1056 2D5 17 – 25 35% max PASS PASS
MATERIAL PROPERTIES FOR NSF/ANSI 51 CERTIFIED SILICONE SPONGE EXTRUDED PRODUCTS
COMPOUND ASTM D 1056 DESIGNATION COMPRESSION DEFLECTION (PSI) HEAT AGE
22 hrs @ 150° C
WATER ABSORPTION COMPRESSION SET
22 hrs @ +100°C
LOW-TEMPERATURE FLEX 5 hrs @ -55°C NSF/ANSI 51 CERFIFIED
5104-NSF ASTM D 1056 2D1 2 – 5 Change in
Compression Deflection ±5%
10% MAX 47% max PASS Yes
5204-NSF ASTM D 1056 2D2 5 – 9 47% max PASS Yes
5304-NSF  ASTM D 1056 2D3 9 – 13 58% max PASS Yes
5404-NSF ASTM D 1056 2D4 13 – 17 46% max PASS Yes
5504-NSF ASTM D 1056 2D5 17 – 25 42% max PASS Yes
BMS 1-60 CLOSED CELL SILICONE SPONGE
COMPOUND GRADE DESIGNATION COLOR COMPRESSION DEFLECTION (PSI) DENSITY lb/ftᶟ, MAX WATER ABSORPTION COMPRESSION SET
22 hrs @ +212°F
ELONGATION %, MIN FLAMMABILITY MAX HIGH TEMPERATURE STABILITY
70 hrs @ +350°F
5129-BMS Grade A Blue-Grey 2 – 6 37 15% MAX 35% MAX 100% MAX 15.0 seconds extinguish time 3.0 seconds drip extinguish time 4.0 inches maximum burn length No evidence of cracking, charring, surface tackiness or other forms of degradation
5329-BMS Grade B Blue-Grey 6 – 12 44 10% MAX
5529-BMS Grade C Blue-Grey 12 – 22 53 10% MAX
BMS 1-23 CLOSED CELL SILICONE SPONGE
COMPOUND COMPRESSION DEFLECTION (PSI) COMPRESSION SET
22 hrs @ 212°F
WATER ABSORPTION CORROSION HEAT AGE
72 hrs @ 350° F
ELONGATION %, MIN
5304-BMS 6 – 14 35% MAX 35% MAX No Effect Shrinkage 5% MAX Disintegration None 150% MAX