Stockwell Elastomerics also makes combination silicone sponge - wire mesh EMI shielding gaskets. The ever growing wireless and electronics markets have increased the stakes for managing electromagnetic interference (EMI) and radio frequency interference (RFI).
Radiant EMI is often emitted by unintended antennas, meaning that internal wires and components can act as emitting antennas. Stockwell Elastomerics manufactures custom EMI shielding gaskets made from various electrically conductive rubber (also called conductive silicone) materials. In-house water jet cutting and stock materials allow Stockwell Elastomerics to quickly supply production and prototype EMI gaskets. Stockwell Elastomerics compression molds conductive silicone and fluorosilicone rubber compounds in its custom molding facility.
Combination EMI gaskets are often used for large NEMA enclosures or other enclosures with limited clamping forces or sheet metal skins. UL 50E and UL 94V-0 rated silicone foams are often used for the water or dust sealing function of the combination gasket. Silicone foam has excellent UV and ozone resistance and long term rebound (compression set resistance), making it a good choice for outdoor EMI enclosure gaskets.
Closed cell silicone sponge materials are better suited for rugged enclosures or enclosures where the gasket is not protected from a jet blast (IP66 or NEMA 4). Military and Aerospace applications may require chemical resistance in addition to EMI shielding and environmental sealing; for these applications Stockwell Elastomerics manufactures EMI combination gaskets using R-10490 closed cell fluorosilicone sponge.
256M a€“ General purpose, double coat (film supported) acrylic pressure sensitive adhesive (PSA) is widely used. F9473 - High bond VHB acrylic adhesive is Stockwell Elastomericss' preferred adhesive for fluorosilicone EMI combination gaskets due to enhanced fluid resistance. Large EMI gaskets for electrical enclosures and cabinets are often addressed using a corrosion resistant Monel wire mesh bonded to a closed cell silicone sponge. Aluminum mesh (AMS 4182) or tin plated copper clad steel wire (ASTM B520) are available on special order. Our company has also obtained ISO9001, IECQ-QC080000, ISO14001, OHSAS18001 and UL certifications. Rubber grommets are essentially rubber molded circular parts which are placed around drilled or punched holes to an opening in a surface. Custom molded grommets and bushings are often used in industries such as commercial, medical, industrial, aerospace and communication. Please visit our gasket materials page for more information on our extensive selection of materials. Enclosures constructed for indoor use to provide a degree of protection to personnel against incidental contact with the enclosed equipment & to provide a degree of protection against falling dirt. 4 = Protected against water sprayed from all directions - Limited to ingress permitted.
6 = Protected against strong jets of water from all directions - Limited to ingress permitted.
For more information on enclosure gaskets and seals or to speak with one of our knowledgeable professionals, please feel free to Contact Us or complete our online Request For Quote form. For an extensive listing of available materials and compounds please visit our gasket materials page. For more information on custom rubber extrusions or to speak with one of our knowledgeable professionals, please feel free to Contact Us or complete our online Request For Quote form.
Monoshield can be supplied with or without silicone impregnation in sheets or die cut gaskets.


In addition to managing EMI emissions and susceptibility, Stockwell Elastomerics' conductive gaskets are used for environmental sealing. EMI shielding materials are an extension of Stockwell Elastomerics' silicone rubber capabilities - EMI gaskets can be die cut, water jet cut or compression molded from electrically conductive silicone rubber compounds with age and weather resistance or conductive fluorosilicone rubber for additional chemical resistance.
Nickel-graphite filled silicone gaskets are widely used for commercial applications where the higher cost of silver or copper filled materials is prohibitive.
Designers in defense and aerospace related applications are now specifying nickel-graphite filled silicone gaskets for custom molded gaskets, O-rings and fabricated gaskets, thereby reducing costs of applications where silver filled or silver plated particle filled compounds were previously specified. Stockwell Elastomerics offers 3M 9713 conductive acrylic adhesive or 3M 9719 conductive silicone adhesives. More complex designs, extending beyond flat cut shapes, are custom molded by Stockwell Elastomerics on-site in the United States. In the right quantities, molding custom EMI gaskets offers engineers significant unit cost savings over die cutting. Stockwell Elastomerics inventories nickel-graphite EMI sheet material made from the same compounds used to mold custom EMI components.
Stockwell Elastomerics is based in Philadelphia, PA and all gaskets and components are manufactured at this single location. Stockwell Elastomerics has partnered with Specialty Silicone Products (SSP) to develop product offerings in nickel-graphite filled silicone and fluorosilicone compounds, supplied with physical test reports to ensure properties are consistently met.
Rogers Corporation's EC-2130 nickel-graphite filled silicone rubber is a compressible 30 durometer electrically conductive gasketing material. Note that Rogers EC-2040, 40 durometer nickel-graphite filled silicone was recently discontinued. Military electronics such as communication equipment and radar equipment requiring maximum shielding effectiveness from high frequencies often require silver or silver plated particle filled compounds.
Compounds for Stockwell Elastomerics' silver plated aluminum filled silicones and fluorosilicones are supplied with physical test reports to ensure properties are consistently met.
The main advantage of EMI shielding gaskets fabricated from conductive elastomers is the combined benefit of environmental sealing over a broad temperature range along with EMI shielding. Stockwell Elastomerics is a leading supplier of custom silicone gaskets and silicone components for commercial, industrial and defense applications.
Server rack gaskets and large NEMA enclosure gaskets can generate significant waste if cut from a single piece of silicone sponge. Particular applications require a higher level of chemical resistance for exposure to fuels or cleaning agents.
This video offers a simple visual demonstration of the conductivity of various EMI shielding gasket materials. Contact Us for further assistance with EMI shielding materials and electrically conductive silicone materials to manufacture EMI gaskets. Electrical Insulation Products – Sheet, Pipe & Tubing Insulation - American Gasket & Die Co, Inc.
Design for Manufacturability: Ease of fabrication, tolerance control, adhesive applications, identification, and costs. Contact us today to get started with your custom electrical insulation or pipe, sheet, or tubing insulation products. Molding the EMI gasket allows the designer to add sealing ribs and other performance enhancing features to optimize environmental sealing and EMI shielding properties.
Closed cell silicone sponge R10470-M and medium density silicone foam HT-800 are most frequently specified for the environmental gaskets. These compounds have been specified for applications ranging from seals for power supply gaskets to enclosure gaskets.


If sheets are not immediately available, Stockwell Elastomerics' on-site Molding operations can quickly produce sheets to support requirements for die cut and fabricated gaskets. EC-2130 is the only nickel-graphite filled gasketing material available in 36" wide continuous rolls making it ideal for large EMI gaskets.
Stockwell Elastomerics has teamed up with Specialty Silicone Products (SSP) to specify compounds with silver plated aluminum fillers having a tight particle size distribution. This EMI gasket material is typically silicone rubber or fluorosilicone rubber with embedded silver plated aluminum particles, silver plated glass beads, silver plated copper particles, nickel-graphite particles or conductive carbon.
The tan material in the video has silver coated aluminum particles, the dark grey material is nickel coated graphite. Stockwell Elastomerics has a broad range of compounds that meet MIL-G-83528B classifications for electrically conductive EMI shielding gaskets.
Our company's reputation for excellence has been built on our ability to provide our valued customers with the most effective designing, engineering and manufacturing solutions to meet their most demanding applications.
The material consists of a fine monel or aluminum which is expanded (as per MIL-S-46044) and impregnated with a 50 durometer silicone rubber. The SNE-540, 40 durometer and SNE-556, 65 durometer nickel-graphite filled silicone compounds in particular have been subjected to extensive testing by several independent testing facilities.
Additionally, all electrically conductive molding compounds and molds used by Stockwell Elastomerics are manufactured in the United States and certified with supporting test data. This provides consistently low volume resistivity and a smooth surface condition that contributes to Stockwell Elastomerics' ability to compression mold these compounds into custom gaskets. The last example shows a 3M conductive adhesive where the conductive path flows through the metal plate, up through the adhesive, through the conductive material into the LED. We will put our extensive industry experience to work for you in selecting the best materials and design to ensure the success of your electro insulation components. Our main objective is to continuously exceed our customer's expectations by providing them with high performance gaskets and sealing products, competitive pricing, on-time delivery and exceptional customer service. The manufacturing process exposes approximately 225 points of contact per square inch to provide an efficient EMI shield with a pressure seal good up to 50 PSI between mating surfaces. Stockwell Elastomerics is committed to supporting medical, defense and other sensitive industries that require the highest quality and material lot traceability. We have materials specialists and a team of knowledgeable machinists that can assist you in the development of electrical insulation products for your application. Our in-house machine shop can accommodate production of insulation products and gaskets in nearly any shape, size, and thickness you require.  With our precision machinery and state-of-the-art technology, we can accommodate a full range of custom angles, die cuts, and laminations. Generally, if the production quantities are expected to exceed 1000 pieces, the initial tooling investment in a compression mold will pay off with a reduced unit cost.
In designing efficient electrical insulation products, we look at a number of important factors.
Our pipe, tubing, and sheet insulation materials provide an effective barrier against unwanted moisture, temperature fluxuations, and potential impact. Although our focus is on custom designed, small or large run custom rubber grommets and bushings, Custom Gasket Mfg.
The rubber molding tolerances for rubber grommets and bushings are complaint with rubber molding industry standard RMA A2 Precision tolerances.



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