Stockwell Elastomerics developed the capability to laminate
3M™ Adhesive Transfer Tape 9667MP onto very thin BISCO® HT-6000 series silicone rubber from Rogers Corporation. The HT-6000 series is liquid silicone rubber, cast as thin as .010″ and .020″ thick – which is considered too thin and stretchy for conventional adhesive lamination processes. Utilizing proprietary laminating processes, Stockwell Elastomerics laminates .002″ thick 3M9667MP adhesive onto these thin silicone materials for display gaskets and sealing gaskets used in ruggedized portable devices.
Designers of rugged hand-held and portable devices are challenged to design the units lighter, thinner and capable of passing stringent IP ratings. Thin, sponge gaskets used for dust and incidental moisture cannot effectively seal out water or withstand immersion. In particular, the HT-6210 (10 durometer Shore A) and HT-6220 (20 durometer Shore A) are very soft, providing positive sealing with minimal closure force. The 3M9667MP acrylic adhesive backing adheres to most plastic housings and stamped metals.
Rogers Corporation is well known for casting PORON® cellular urethane and BISCO® Silicone Foams. A similar technology is used to cast HT-6000 liquid silicone rubber (LSR) in thicknesses including .010″, .020″, .032″, .062″ and .125″ thick. These ‘LSR’ silicones are platinum cure grades, known for their purity and resiliency. See the chart below for the properties of these materials.
|Material||Color||Duro “A”||Tensile Strength (PSI)||Elongation
at Break (%)
|Compression Set, %
70 hrs @ 302°F
|HT-6210||Gray||10||250||500||25||35||-67°F to 392°F||Sealing under low deflection force|
|HT-6220||Black||20||800||650||55||35||-67°F to 392°F||For light seals and rugged sealing|
|HT-6135||Cream||35||800||450||70||30||-67°F to 392°F||Light color for aesthetics|
|HT-6240||Clear||40||800||250||75||35||-67°F to 392°F||Unpigmented / transparent*|
|* The 3M9667MP acrylic adhesive is also clear|
3M™ high performance acrylic adhesive 200MP is selected for ultra-thin gaskets because the .002″ thick 3M9667MP adhesive does not add excessive thickness to the design stack-up. This adhesive provides excellent adhesion to metal and high surface energy plastics. Despite being an unsupported transfer film adhesive, 3M9667MP provides some dimensional stability and initial repositionability for placement accuracy when bonding the ultra-thin silicone gaskets onto plastics. The 78# polycoated Kraft paper release liner is moisture proof to withstand water jet cutting, and relatively thick (.0057″) for kiss cutting using die cutting and flash cutting processes.
Contact Us for further assistance with ultra-thin silicone gaskets and acrylic adhesive backing for display gaskets and sealing gaskets.
BISCO® and PORON® are registered trademarks of Rogers Corporation.
3M™ is a registered trademark of 3M Company.