Enclosure Sealing and Insulation: Performance Properties and Applications

enclosure sealing

What’s the right enclosure sealing and insulation for your application? There’s a lot to consider.

Elasto Proxy custom-fabricates seals, gaskets, and insulation for enclosures that house machinery and equipment. These industrial rubber products can provide environmental sealing, acoustic insulation, flame resistance, EMI shielding, chemical resistance, and other performance properties. As the following examples show, enclosure sealing and insulation varies by application.

Environmental Sealing and Acoustic Insulation 

Gensets or generating sets supply off-grid electricity. They consist of a diesel or gasoline-powered engine and an electrical generator (such as an alternator) that converts mechanical power into electricity. To support repairs and maintenance, this equipment is housed in an enclosure with a door. The genset’s door gaskets provide environmental sealing, but the enclosure also needs acoustic insulation.

Sealing a genset door isn’t a job for just any rubber product. Static seals are fine when there’s no relative motion between mating surfaces, but dynamic seals are recommended when there’s motion or movement between sealing interfaces such as a door and door frame. Rubber gaskets also need to resist compression set – the permanent deformation of a material – when the enclosure door is closed.

Rubber gaskets provide some acoustic insulation, but an engine in an enclosed space is loud. Sound absorbers made of acoustic foams can be “tuned” to address these frequencies. Sound barriers and vibration dampers also support noise control. That’s important for complying with workplace limits on noise exposure and avoiding “noise pollution” in areas such as neighborhoods.

Flame and Fire Resistance 

Manufacturers of electrical and electronic systems may need enclosure gaskets that are made of fireproof rubber. The UL 94 standard from Underwriters Laboratories (UL) defines 12 different flame ratings, so it’s important to determine which rating applies to your design. Engineers also need to consider whether the rubber gasket or the entire enclosure needs to meet this demanding standard.

Compounds that are described as “capable of passing UL 94” or “compliant with UL 94” probably don’t have a UL yellow card – proof that Underwriters Laboratories (UL) has tested and recognized the material. However, these less-expensive materials may still meet your requirements. Before selecting a compound then, engineers need a complete understanding of the application.

EMI Shielding 

Electronic devices and equipment that are housed in an enclosure may require protection against electromagnetic interference (EMI) that can disrupt or damage circuits. The causes of EMI are numerous and can include both manmade and naturally-occurring sources. In industrial and commercial settings, the causes of EMI typically include brush motors, computer circuits, and lighting.

Gaskets made of particle-filled silicones provide both EMI shielding and environmental sealing. These metal-filled elastomers also provide electrical conductivity and resist a wide range of service temperatures. For applications that require resistance to fuels and industrial fluids, EMI gaskets made of particle-filled fluorosilicones are used.

Chemical Resistance

Enclosure gaskets are also needed by the pharmaceutical industry, which uses solid dosage processing equipment to manufacture finished doses of medication in tablet or capsule form. Often, these solid doses are coated to mask the medicine’s taste or odor, protect the drug in the stomach, and to control its release profile. In turn, these coatings may contain chemicals that can attack rubber.

Fluorosilicone enclosure gaskets can withstand these chemicals. These rubber gaskets also provide other performance properties such as excellent stability over a wide temperature range. Fluorosilicones gaskets resist compression set, too. Fluoroelastomers are more expensive than some other compounds but are cost-efficient to produce with the right cutting and bonding techniques.

Choose Enclosure Sealing and Insulation from Elasto Proxy

Elasto Proxy custom-fabricates enclosure seals, gaskets, and insulation with the right performance properties for your application. We use water jet cutting, offer a variety of bonding methods, and can help you with seal design and compound selection. If you need enclosure sealing and insulation solutions, please contact us.

Value-Added Manufacturing: Parts Marking, Kitting, and Custom Packaging

Value-Added Manufacturing

Value-added manufacturing transforms engineered products into goods that save you time and money. It’s different than fabrication, the process of manufacturing a product like a gasket from a semi-finished material like an extrusion. By outsourcing fabrication and leveraging a vendor’s value-added services, you can reduce costs and improve efficiency.

Consider the following example. Instead of paying your employee to cut and bond gaskets, you outsource the gasket fabrication. If you’re using a relatively expensive employee to cut-and-bond, you’ll save money on labor costs. You’ll also reduce material waste from mis-cuts and improve material yields. Yet outsourced fabrication can do even more.

Value-added manufacturing like parts marking, kitting, and custom packaging make your products faster, easier, and less expensive to order, receive, stock, pick, and install. That’s true for gaskets as well as for thermal and acoustic insulation. Even rubber floor mats provide an opportunity for added value.

Let’s take a closer look. Continue reading Value-Added Manufacturing: Parts Marking, Kitting, and Custom Packaging

Better Bonded Gaskets for Sealing and Insulation

Better bonded gaskets improve quality and perceptions of quality. They reduce labor costs and support sales, too.

Bonded Gaskets

Finished gaskets need strong bonds to provide reliable sealing and insulation. In applications where rubber gaskets are visible, bonds that look better also suggest higher product quality. Buyers of specialty vehicles, commercial ovens, and electrical enclosures (just to name a few) don’t want to see bonded gaskets that look like they’re ready to pull apart in the corners or that need touch-ups.

Even in applications (such as HVAC systems) where finished gaskets are hidden, failure is expensive. Replacing the rubber seal in an air conditioning unit may cost more than you realize. In addition to paying for a replacement part, there are direct labor costs. Indirect costs including traveling to and from the job site, scaling ladders, pulling and replacing panels, and completing paperwork. Over time, it all adds up.

Gasket bonding may seem simple, but it’s skilled labor. You can buy your bonded gasket equipment, but machines don’t come with expertise. Even in an age of digital manufacturing, some activities still require craftsmanship. Plus, some bonding methods require cuts that you don’t have the equipment to make. You can try using guillotine saws or hand tools, but you can’t match water jet cutting. Continue reading Better Bonded Gaskets for Sealing and Insulation

Vendor Consolidation is Right for Rubber Products

Vendor ConsolidationVendor consolidation is a procurement strategy where you reduce the number of vendors that your company buys from. Businesses don’t want to become overly dependent on a single vendor or a handful of vendors, but there are costs – and risks – from having too many suppliers. There are also benefits to lowering the number of vendors that you do business with. Let’s take a closer look. Continue reading Vendor Consolidation is Right for Rubber Products