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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. The Elastomerics Blog offers practical and technical insight to gasketing and cushioning applications.
Continually committed to testing and validating their materials, Rogers Corporation recently had HT-800 silicone foam tested by a third party for flame propagation per ASTM C 1166.
As we’ve known, HT-800 and the BISCO HT-800 family of silicone foams; BF-1000, HT-870, HT-800, HT-820 and HT-840 perform very well in burn tests. Stockwell Elastomerics is a Preferred Converter for Rogers Corporations Bisco silicone products and Poron urethane foam products. A recent Consumer Reports tested the Moto 360 Sport smartwatch for water resistance with the IP67 water test simulating a submersion up to 1 meter deep for 30 minutes.
Gasket Stress Relaxation - this is when the gasket relaxes and stops pushing back, letting external pressures push past the gasket. Dispensing seam or flash - dispensed gaskets share a starting and ending point, it's possible to have a small "bump" or "divot" that may not have been accounted for in a tolerance analysis or closure force.
Being a gasket nerd, I pay attention to gasket materials used on a wide range of products and what type of sealing is being done. Stockwell Elastomerics maintains inventory of UL 50 and UL 94 gasket materials that are well suited for outdoor lighting applications. Stockwell Elastomerics is a custom gasket manufacturer with a core competence in silicone rubber and other high performance gasket materials.
Military Specification Mil-R-6130C established requirements for cellular rubber used for sponge gaskets and cushioning pads in defense equipment in the 1980’s and 1990’s. In the 1990’s a committee was convened to develop the ASTM D6576 Standard for Flexible Cellular Rubber materials. Many of us in the industry did not anticipate the cancellation of Mil-R-6130C by the US Department of Defense on March 19, 2001.

If ASTM D6576 is a requirement on your new silicone sponge gasket designs – your engineering team should confirm whether the narrow compression force deflection range of the ASTM D6576 standard is necessary. Stockwell Elastomerics manufactures EMI gaskets from a range of processes including, compression molding, waterjet cutting, tool-less flash cutting, and die cutting. SMD Gaskets consist of a high performance, electrically conductive elastomeric gasket that consists of conductive film and elastomeric material.
SMD Gasket building blocks have been developed to suppress electromagnetic radio frequency interference in electronic devices where inter-cavity shielding is critical.
We are specialized in high quality polyester fabric for bags, handbags, schoolbags, camping chairs, luggages,household products and so on. This easily mounted clip-on gasket is composed of two layers: a sponge rubber water seal, and an EMI-shielding side of highly conductive, wear-resistant metallized fabric.
The gasket is assembled without tools, simply by manually pressing the section onto the metal flange of your enclosure.
To get a quotation for Clip-on gasket standard shapes within 24 hours fill in the form below. Worldwide leading manufacturer of EMC (electromagnetic compatibility), EMI (electromagnetic interference) and RFI(radiofrequency interference) shielding solutions. Keep up to date with the latest developments in Holland Shielding Systems BV by signing up for our newsletter. Knitted wire mesh gaskets provide a cost-effective solution to high shielding performance applications in the magnetic and electrical fields, including EMP.
For high frequency shielding, foil-based gaskets like Amucor Shield 6800 series will perform better, because of their much larger contact surface.
The maximum deflection with a sponge elastomer core is approximately 30%, with hollow extrusion 50%.
Compression levels are important in applications such as liquid filtration and noise attenuation, where flow resistance is critical.
The most commonly used material.Insensitive to corrosion and neutral on the galvanic scale.
Used in some cases for aluminium enclosures.Aluminium can be chromed with an Al-chrome 1200 layer, if necessary.
Excellent magnetic as well as electrical properties, because a Ferro alloy is covered with copper.The outside is tinned to prevent corrosion. 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.
Stockwell Elastomerics provides custom solutions, parts and materials to engineers in technology sector.
Stockwell Elastomerics maintains inventory of the vast majority of both the HT-800 family and Poron family of products. Custom gaskets are made from materials that meet specific performance requirements; fluorosilicone is used for chemical and fuel resistance, silicone is used for its wide temperature range and UV resistance, Poron foam is used for its excellent rebound. Both closed cell (Type 2) and open cell (Type 1) sponges were covered in this specification.
We can provide certifications for ASTM D6576 for silicone sponge materials taking an exception to the narrow compression force deflection range.
Even though the specification is officially expired, with adequate lead time a material batch can be tested and qualified to meet this specification with a certificate of conformance. Instead of dough; a thin preform of catalyzed silicone gum is heated and allowed to expand.
The mil spec can be restrictive from a  design perspective - for example, hardness is limited to 65 durometer or expensive conductive particles (silver) are required.
All EMI gaskets, both molded EMI gaskets and cut EMI gaskets are produced at Stockwell Elastomerics' Philadelphia, Pennsylvania location.

These gasket building blocks are placed in series and soldered to the ground trace of a printed circuit board to form a complete EMI shielding gasket.
We doesn't provide tpe coated fabric products or service, please contact them directly and verify their companies info carefully. The gaskets can be made either completely from knitted metal mesh or from knitted metal mesh over an elastomer core which allows recovery after compression. Neither the service provider nor the domain owner maintain any relationship with the advertisers.
Stockwell Elastomerics has a broad range of compounds that meet MIL-G-83528B classifications for electrically conductive EMI shielding gaskets.
A common test requirement for rail applications, the Federal Railroad Administration has a limit of 4” of flame propagation on an 18” test specimen. In addition, we did a “solder torch test” on HT-800 (we’ll post a video in a later blog), HT-800 did not catch fire, drip or melt even with the more aggressive flame. Much like the gasket material, the pressure sensitive adhesive backing is selected based on performance. The intermediate firmness ranges are narrow and difficult to control in full production batches of closed cell sponge. Controlling the density, thickness and compression force deflection of the cured silicone sponge may require more leeway than ASTM D6576 allows. Stockwell Elastomerics manufactures standard and custom EMI gaskets from Type B, QPL listed conductive rubber. For EMI applications not requiring MIL-G-83528 EMI materials, Stockwell offers non-mil spec EMI materials that have been third party tested per Mil-G-83528 for attenuation performance. And also these gaskets have a performance of electrical conducting pass-way between the PCB layers. The gasket can be bent in either direction (it can not be bent into a right angle, but it can form a rounded corner with a very small radius).
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3M 9375W was designed to meet various flame ratings, including UL 94, FAR 25.853, NFPA 1971 and FMVSS 302. A subset of the products covered by this standard are closed cell silicone sponge products.
As one example, Mil-R-6130C condition soft formerly required 2 to 7 psi CFD; now ASTM D6576 condition soft requires a tighter 2 to 5 psi CFD.
These gaskets are capable of attenuating EMI noise as well as sealing out environmental conditions. The long life and low maintenance cost associated with new lighting technology is considerable contributor to realizing the return on investment.
Soft condition called out 2 to 7 psi Compression Force Deflection (CFD), Medium called out over 7 to 14 psi CFD and Firm specified over 14 to 21 CFD. Apparently one of the leading producers of closed cell silicone sponge was not represented on the ASTM committee, and these six compression force deflection, or firmness ranges were published with the standard on April 10, 2000. Producing and certifying to these tighter firmness ranges has been difficult for the silicone sponge manufacturers. CFD is basically defined as the amount of force needed to deflect one square inch of sponge by 25% per ASTM D1056.

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