The product availability ranges from general purpose and military specification grades, high flex / high tear strength grades, new liquid silicone rubber sheet (LSR) products that have exceptional elongation properties, silicones with UL94 flame ratings, electrical conductivity and thermal conductivity among other properties.
Silicone Sheet Thickness Tolerances Table
Silicone Sheet in Continuous Rolls
Stockwell Elastomerics, Inc. maintains a full inventory of solid silicones that have been calendered and rotocured in 36" wide continuous rolls, in thicknesses from .015" thick to .125" thick. Silicone sheet that has been calendered and cured in an autoclave or rotocured, will usually have tighter thickness tolerances than molded sheets (see chart below - Solid Silicone Sheet Thickness Tolerances).
The majority of silicone rubber sheet manufactured is cured from gum based silicone - specifically methyl vinyl silicones, which meet a number of military, AMS and industrial specifications. These common silicones have a durometer range of 25 to 70 shore A, and the temperature range for these silicones is generally -100°F to 500°F.
The methyl-based gum silicones can be compounded to have high elongation, flex, tensile and tear properties for mechanically demanding properties. Stockwell Elastomerics, Inc. inventories high strength silicone sheet in thicknesses and durometers ranging from .015" to .125" thick and in 30, 50 and 70 Shore A.
Relatively new liquid silicone rubber sheet (LSR) is cast and cured into thin gauge continuous rolls from .010" to .032" thick in 36" widths. The most commonly available LSR sheet materials are provided in 10 to 40 durometer Shore A. LSR compounds have a platinum cure system, which decreases out-gassing and makes these silicone products more friendly to electronic, medical and optical applications.
Specialty Silicones in 12" x 12" Molded Sheets
Stockwell Elastomerics, Inc. has in-house compression molding capabilities, which allows us to provide 12" x 12" molded gum based silicone sheets in virtually any thickness from .020" through .500" thick.
Fast-turn and short run molding of custom silicone sheets in many non-standard compounds, durometers and specifications are available for prototyping and initial production requirements. Examples of special compounds include phenyl based silicones for extreme low temperature (-130°F), flame retardant, semi-conductive and electrically conductive silicones, thermally conductive silicones and others.
Specifications Met by Silicone Rubber
The most frequent specification requested is ZZR765, or ZZ-R-765b or ZZ-R-765e. The ZZR765 military specification is now listed within A-A-59588. The same convention applies; ZZR765 Class 1 calls out extreme low temperature phenyl base silicone, ZZR765 Class 2 calls out general purpose, low compression set methyl-vinyl silicone and ZZR765 Class 3 calls out high tear strength grades of silicone.
Silicone Sheet in 36" x 36" Molded Sheets
Stockwell Elastomerics, Inc. inventories 36" x 36" gum based silicone sheet in .188" (3.18mm) through .500" (12.7mm). We inventory 50 durometer silicone in every standard gauge (.188", .250", .375" and .500") and 30, 40 and 70 durometer silicone in many gauges from .188" through .500".
Stockwell Elastomerics, Inc. has developed a 12" x 12" injection molding process to support the needs of customers requiring liquid silicone rubber (LSR) in sheets, .032", .062", .125" and .188" thick. The present durometer range is 5 to 70 durometer shore A. Special colors and pressure sensitive adhesive backings are often provided on sheets molded with this unique capability - which are often water jet cut into made-to-order gaskets from our customer's electronic dxf files.
Solid silicone rubber sheet material is readily fabricated into gaskets and cushioning pads. Stockwell Elastomerics, Inc.'s fabrication capabilities include die cutting, adhesive lamination, slitting to width and water jet cutting of prototypes and production components.
Silicon Rubber, Silicon Sheet or Silicone Rubber?
We see silicon rubber called out frequently. Although silicon is often called out on prints, silicone is the widely accepted terminology used in the rubber industry.
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