Seal Rounded Corners by Starting with These Three Measurements

Seal Rounded Corners with Bulb Trim Seals Do you need to seal rounded corners against wind, water, dust, or dirt? Bulb trim seals are industrial rubber products that provide sealing and insulation for machine doors, vehicle hatches, and equipment enclosures. They’re designed to seal rounded corners and have separate bulb and retainer sections. Each of these sections can use a different material and have a different durometer or hardness.

With bulb trim, the bulb section compresses to form a seal when the door, hatch, or enclosure is closed. The trim or retainer section attaches to a flange or substrate. To choose bulb trim for your application, you need to specify the bulb size, bend radius, and flange thickness. By choosing the right bulb size, you can avoid over-compression. The right bend radius and flange thickness help to avoid kinking and leakage. Continue reading Seal Rounded Corners by Starting with These Three Measurements

Vibration Dampers for Structure-Borne Noise

Vibration DampersVibration dampers dissipate the energy that causes resonant vibrations in built structures. Vibration, a back-and-forth movement or oscillation, produces structure-borne noise in machine enclosures, engine bays, generator sets, heavy trucks, military vehicles, and many other applications. Vibrations can also damage parts, loosen fasteners, weaken soldered connections, and suggest poor quality.

For engineers, it’s important to understand that objects have a frequency at which vibration occurs. With resonant vibrations, multiple objects vibrate at the same frequency. For example, the low-frequency rumble of a big diesel engine can cause a vehicle’s windows to rattle. These vibrations don’t just produce unwanted sounds. They can also damage the window glass.

In this article, the last in a series about custom acoustic insulation, Elasto Proxy explains what engineers need to know about the different types of vibration dampers. You’ll also learn how this type of custom acoustic insulation is cut from sheets and bonded to other types of materials.

Types of Vibration Dampers

Vibration dampers are made of extruded vinyl, asphalt-impregnated paperboard, metal foil, or fiberglass.

Extruded vinyl dampers are flexible, lightweight, and available in grades that meet specific standards. For example, vinyl that meets UL 94 V0 flammability requirements is used in hospital equipment, kitchen appliances, and computer housings. Vinyl that meets ASTM E662 for the optical density of smoke and ASTM 162 for surface flammability is used in buses, trains, and subways.

Asphalt-impregnated paperboard dampers are odorless, wear-resistant, waterproof, lightweight, and  cost-effective. Like extruded vinyl, they’re supplied in sheets that can be cut to size and then laminated to other materials. For example, asphalt-impregnated paperboard can be laminated to sound barriers. Asphalt-impregnated paperboard can also be bonded to flat or curved panels in built structures.

Metal foil dampers can be applied directly to structural components or bonded to other types of insulating materials. For example, aluminum foil can provide the facing for a sandwich-like structure that includes a sound absorber and a heat blocker. To support vibration damping, metal foils can be embossed so that raised features in the foil disrupt sound waves as they travel across the surface.

Fiberglass dampers are made of a reinforced plastic that’s composed of glass fibers embedded in a resin matrix. These thin, composite materials include laminates with a viscoelastic compound that’s sandwiched in the center. For optimum damping performance, both outer layers of the fiberglass may have the same thickness. Applications include acoustic hoods and housings.

How Vibration Dampers are Made

Vibration dampers are cut from sheet materials and can be laminated to other types of insulation. They can also feature a release liner with a pressure-sensitive adhesive (PSA) for peel-and-stick installation. For engineers, it’s important to understand how choosing the right fabrication method affects cost, consistency, and quality.

Cutting can be done in-house or by a custom fabricator. Manual cutting with a knife, saw, or other hand tools may seem cost-effective, but poor-quality cuts can result in rework and material waste. By contrast, water jet cutting creates fine, fast, consistent cuts that maximize material yields. Plus, unlike die cutting, there’s no paying for or waiting for tooling with water jet technology.

Laminating combines vibration dampers with other types of materials in a sandwich-like structure. To avoid delamination, this bonding process requires the right adhesives and the efforts of skilled production personnel. Some vibration damping materials, such a fiberglass with a viscoelastic core, are laminated when they’re manufactured. Other vibration dampers are laminated during custom fabrication.

Find Vibration Dampers for Structure-Borne Noise

The article you’ve been reading is the last in a series about how to stop noise with custom acoustic insulation. For more information, please contact Elasto Proxy. You can also ask for the Elasto Bag to see some sample insulation for yourself.

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Sound Barriers for Noise Control

Sound BarriersSound barriers are custom acoustic insulation that blocks sounds instead of absorbing or damping them. They’re made of dense materials and are used at the source of a sound and along its path. To choose the right noise control product, engineers need to understand how sound barriers work, how they’re made, and the different types that are available. Continue reading Sound Barriers for Noise Control

Sound Absorbers for Noise Control

Sound AbsorbersSound absorbers are custom acoustic insulation that absorbs sounds instead of blocking or damping them. They’re made of foams and facings and used at the source of the sound and at its receiver. To choose the right noise control solution, engineers need to understand how sound absorbers work, which types are available, what questions to ask during material selection, and how sound absorbers are made. Continue reading Sound Absorbers for Noise Control

Stop the Noise with Custom Acoustic Insulation

Custom Acoustic InsulationCustom acoustic insulation absorbs, transmits, or redirects sound waves – vibrations in the air that pass-through objects and result in audible sound. Noise, or unwanted sound, is measured in decibels (dB) and has a specific frequency distribution that’s measured in Hertz (Hz).

Unlike some noise control products, custom acoustic insulation can be “tuned” to address specific frequencies. Examples include the low-frequency rumble of a big diesel engine and high-frequency sounds like squeaking and squealing.

Custom insulation can strengthen product designs, but engineers need to know which questions to ask and what types of solutions are available. In this introductory article, you’ll learn about the basic elements of noise control. You’ll also learn about the basic types of acoustical materials and how they’re fabricated. Continue reading Stop the Noise with Custom Acoustic Insulation

Cold Bonding vs. Injection Molding for Finished Gaskets

Finished Gaskets - BlogCold bonding for finished gaskets joins cut lengths of rubber without the use of heat. This bonding technique isn’t performed under low-temperature conditions but is manual process that requires a brush and glue. By contrast, injection molding is a semi-automated process that uses a C-press machine with a heated barrel, metal plates, and tons of pressure. To join cut lengths, uncured rubber is used.

By understanding how these joining processes work, engineers can make better decisions about which types of finished gaskets to choose. It’s also important to understand the advantages of disadvantages of each bonding technique. In this week’s article, we’ll compare cold bonding with injection molding in terms of capabilities, costs, and quantities. Continue reading Cold Bonding vs. Injection Molding for Finished Gaskets

Window Channel Selection Tips

Window ChannelWindow channels are rubber gaskets that hold window glass in place and help to secure window frames. They also eliminate rattling and provide protection against wind, water, dust, and debris. Applications for window channels include mobile equipment, defense, medical and health, stainless steel and food equipment, infrastructure, and aerospace.

For engineers and product designers, window channel selection begins by understanding the types of products that are available. It’s also important to define your application requirements and to compare product specifications. In this article from Elasto Proxy, you’ll learn how to select window channels that provide the sealing and insulation you need. Continue reading Window Channel Selection Tips

Four Common Shapes for Extruded Rubber Seals

Shapes for SealsThere are four common shapes for extruded rubber seals. Do you know which shape is the right choice for your gasket application? Engineers and seal designers can choose P-shapes, D-shapes, E-shapes, and lip seals. Purchasing agents can either order cut lengths or buy spliced gaskets.

In this article from Elasto Proxy, you’ll learn when to choose and how to use the four common shapes for extruded rubber seals. We also invite you to stay tuned for a series of short videos that will explain what you need to know about P-seals, D-seals, E-seals, and lip seals. Continue reading Four Common Shapes for Extruded Rubber Seals

Bulb Trim Selection Tips

Bulb Trim Bulb trim provides sealing and insulation for doors, hatches, and enclosures with rounded corners. These industrial rubber products have separate bulb and retainer sections, each of which can have a different durometer or hardness. The bulb forms a seal under low-to-medium closure force. The retainer or trim is pressed into place over a flange and may have an integral tongue or metal clips to promote attachment.

Elasto Proxy supplies a wide variety of bulb trim seals and can custom-fabricate finished gaskets that save time and money on your assembly line. In this article, you’ll learn how to choose the right bulb trim for your application. Whether you work in engineering, procurement, or production, compound selection and part dimensions are critical. Product features vary, too. Continue reading Bulb Trim Selection Tips

Gasket Compression in Metal Housings and Assemblies

Gasket CompressionGasket compression in metal housings and assemblies can support sealing or contribute to gasket failure. That’s because rubber gaskets are resilient, but only to a point. Compressing a gasket within allowable limits forms a reliable seal. When a gasket is over-compressed, however, the rubber won’t rebound when the compressive stresses are removed. This creates a gap between the gasket and the surface of the housing or assembly. Gaps cause leaks, and seals that leak won’t support your designs.

Material scientists calls the permanent deformation of the gasket material “compression set”, a term that’s used widely but not always fully understood. Engineers need to know the basics of compression set, but they also need to consider its limitations as a test method. With housings and assemblies, it’s essential to account for the entire application environment, including variables such as temperature and vibration. Relaxation, a related phenomenon, is also associated with gasket compression. Continue reading Gasket Compression in Metal Housings and Assemblies