Polyurethane foam material properties and specifications

 

Foam is a material that has been foamed by plastic particles, referred to as foam. Foam is divided into PU foam, anti-static foam, conductive foam, EPE, anti-static EPE, CR, EVA, bridging PE, SBR, EPDM, etc.

Foam has a series of characteristics such as elasticity, light weight, fast pressure-sensitive fixation, convenient use, free bending, ultra-thin volume, and reliable performance.

 

Foam classification:

By material:

Polyester foam: polyether foam (chemical foam, physical foam), polyurethane foam.

Polyethylene foam: PE foam (chemical cross-linking, electronic cross-linking), EVA foam.

Rubber foam: CR foam (neoprene rubber), NR foam (nitrile rubber), SBR foam (styrene butadiene rubber), EPDM foam

According to the cell structure, it is divided into: open cell foaming, semi-open cell (independent) foaming, closed cell foaming (independent foaming), and microcellular foaming.

According to the material, it can be divided into: silicone foam, PU foam, PE foam, EPDM sound-absorbing cotton, EPE foam, PVC foam, PPP foam, CCR foam, EVA foam, XPE foam, IXPE foam, acrylic Foam etc.

Foam Features:

●The shielding effect of low pressure is very good, and the shielding efficiency exceeds 90dB.

●Flexible and light in weight.

●Anti-corrosion nickel coating can prevent electrochemical corrosion.

●Low surface contact resistance.

●Quick pressure-sensitive fixation.

●Customers can specify the length.

● Numerous section options.

●UL class fireproof.

Can be pasted with Mylar (Valet double-sided tape) product quality is stable,

Heat-resistant pressure, not easy to fall off, high tensile strength,

After the product is installed, at a low temperature of -20 °C to a high temperature of 80 °C,

The quality of the cycle test is still maintained for 72 hours.

It has the advantages of convenient use, free bending, ultra-thin volume,

Reliable performance and a series of characteristics.

 

Compression options for polyurethane foam seals:

The tightness of the foam is a very important indicator in the design.

1. Sealing against dust and water droplets: 5% compression.

2. Sealing against water (10cm): 30% compression

 

Sealing performance can be improved by:

Increase the amount of compression: The higher the amount of compression, the better the seal can be.

Skinned Foam Surfaces: Products with skins reduce the chance of contact surface leakage.

Tape: Double-sided tape reduces the chance of contact surface leaks, even if the compression is small.

Consistent resilience: All contact surfaces are guaranteed to be resilient.

Increase the foam area: Increase the path that the leak has to travel.

 

 

PU foam

PU is polyurethane, the abbreviation of English poly urethane, the chemical Chinese name is polyurethane foam. Polyurethane foam is divided into super soft series, soft series, hard series and fast rebound series, with complete specifications and models. Polyurethane foam has excellent compression set resistance to ensure long-term stability in caulking, gasketing and sealing applications. Maintains integrity and effectiveness even with prolonged exposure to changing temperatures. Ideal for use in potentially extreme environments. Various applications including heat, vibration, dust, dirt and vibration.

conductive foam

The conductive foam wraps the conductive cloth on the flame-retardant sponge. After a series of treatments, it has good surface conductivity and can be easily fixed on the screen with adhesive tape.

on the shielding device. Shielding materials with different cross-sectional shapes, installation methods, UL ratings and shielding effectiveness are available.

Conductive foam can be divided into: aluminum foil cloth foam, conductive fiber cloth foam, gold-plated cloth foam, carbon-plated cloth foam, etc.

Conductive Foam Features and Benefits

RoHS compliant

Improved Z-axis resistivity increases shielding effectiveness to over 90dB over a wide frequency range

Applicable thickness 0.039" ( 1mm), 0.060" (1.5mm), 0.079" (2 mm), 0.098" (2.5 mm), 0.125" (3.2mm), width up to 0.250" (6.4mm)

Large compression range, up to 60% of the original thickness

Also has UL94 HB and V0 flame rating

Available in a variety of standard configurations including D-subs, USB port, IEEE 1394, SCSI and RJ 11. (Also available in sheet and rectangular form factors)

Can be die-cut to desired shape

Die cut I/O, rectangular pads and panel pads are available with or without conductive adhesive backing

Low residual deformation ensures long-term performance of the product

Widely used in PDP TVs, LCD monitors, LCD TVs, mobile phones, notebook computers, MP3, communication cabinets, medical instruments and other electronic products as well as military and aerospace fields

 

Aluminum Foil Foam

Aluminum foil foam is made of soft pure aluminum foil and glass fiber composite aluminum foil cloth instead of conductive cloth to wrap flame retardant foam. Surface impedance ≤ 0.016Ω, with excellent shielding performance of metal, its temperature resistance can reach 130 ℃, low cost, can meet the needs of product cost pressure. The conductive foam of aluminum foil cloth has excellent performance, and its shielding performance exceeds 100db. It has high elasticity, reduces the conductive resistance of the contact surface, resists corrosion, and improves the compatibility of the metal plating of the connector assembly.

 

CR foam

CR foam is a kind of general-purpose special rubber. In addition to the good physical properties of general rubber, it also has excellent properties such as flame resistance, oil resistance and chemical corrosion resistance, so it occupies an important position in various synthetic rubbers.

Main features:

1. It has excellent sealing performance to avoid gas release and atomization.

2. Excellent resistance to compression deformation, that is, the elasticity is durable, which can ensure long-term shock protection of accessories.

3. It is flame-retardant, does not contain harmful and toxic substances, will not remain, will not pollute the equipment, and is not corrosive to metals.

4. Can be used in a variety of temperature ranges. It can be used from minus 40 degrees Celsius to 90 degrees.

5. The surface has excellent wettability, easy to bond, easy to manufacture and easy to punch.

6. Engineered polyurethane formulations offer a wide range of modulus - 2-90 psi @ 25% deviation - for more design flexibility.

Can be customized according to customer requirements, fit all kinds of imported tapes, good viscosity, the products are used in communications, computers, household appliances, calculators, electronic toys and various electronic controllers and other fields

 

Here are so many types of foam. There are many specifications and models can be contacted for consultation.