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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. Custom Molding - Custom Extrusion - Die Cut Gaskets - Custom molded Seals - Custom Molded O-Rings - D-Rings - Sheet Stocks.

Stockwell Elastomerics manufactures custom enclosure gaskets for electrical enclosures, NEMA enclosures, IP enclosures, UL 50 enclosures, EMI enclosures, battery enclosures and plastic enclosures to customer specification. Protect the gasket - a flange on the door that protects the gasket from a direct pressure blast will diffuse the force and greatly improve the chances of passing a wash down test.
Door latching - the key to passing a NEMA, IP or UL gasket test is to have the proper means of compressing the gasket.
Material selection - ensure the appropriate gasket material is used for the test or type requirement. Gasket rebound - gasket rebound or resistance to taking a compression set can be critical, especially on door gaskets that are being unseated regularly. Functional life - longevity of the gasket will depend on how the material is used; exposure to UV, ozone, temperature, chemicals, and mechanical wear affect longevity. Venting - pooled water can get sucked into an enclosure during a rain shower from the vacuum affect from cool rain on a hot box.
The NEMA Type gasket reference as it pertains to environmental gasketing refer to NEMA 250 for actual specification. Indoor enclosure, protects against falling dirt, settling airborne dust, lint, fibers and flying debris. Indoor enclosure (Type 12 without knockouts, Type 12K with knockouts), protects against falling dirt, settling airborne dust, lint, fibers and flyings. Indoor enclosure, protects against falling dirt, settling airborne dust, lint, fibers and flyings. Example: IP54 refers to an electrical enclosure capable of sealing out dust, water and protect against vertically dripping water.
Below are common IP specifications for which Stockwell Elastomerics regularly manufactures gaskets. Stockwell Elastomerics regularly applies 3M 9713 or 3M 9719 conductive adhesive to stock or custom EMI gasket material to make enclosure gaskets.
The majority of EMI gaskets and RFI gaskets produced by Stockwell Elastomerics serve the dual functions of EMI attenuation and environmental gasketing.
Stockwell Elastomerics manufactures gaskets for plastic enclosures from gasket materials that are soft to account for low closure forces.

Wash down plastic enclosures - IP64 or IP65 often use closed cell sponges or closed cell foams. Dust gaskets for plastic enclosures - expanded urethane foam (PORON®) and neoprene sponge are often specified for dust gaskets. Plastic enclosures are particularly sensitive to closure forces and bowing between fasteners or latches. Contact Us for further assistance with custom enclosure gaskets including custom for electrical enclosures, NEMA enclosures, UL 50 enclosures, EMI enclosures, IP enclosures, battery enclosures and plastic enclosures. I found this picture of workers at EMI's pressing plant in Hayes, Middlesex, assembling copies of The Beatles' Rubber Soul in late 1965. I don't think it requires much comment, just to point out that any one of those stacks of records, if they'd been spirited away from Hayes and kept safe for 40 years, would be worth thousands now. Tagged: the beatles, my scans, 1965, emi studios, rubber soul, jl, john lennon, ph robert freeman, . 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. Also protects against water (rain, sleet, snow, splashing water and hose directed water) and effects of ice formation. Typical plastic enclosures requiring soft gaskets include; handheld device gaskets, junction box gaskets, battery compartment gaskets, and touch screen bezel gaskets. Stockwell Elastomerics has a broad range of compounds that meet MIL-G-83528B classifications for electrically conductive EMI shielding gaskets.
This is the major difference between UL testing, NEMA and IP where gaskets are not explicitly evaluated.

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