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Vulcanized fiber discs (commonly known as fiber discs) are round grinding wheels with a backing made of vulcanized fiber that is coated on one side with resin and abrasive grain. Fiber discs are fitted to suitable backing pads and used on angle grinders, predominantly for machining metal.

The safety requirements applicable to fiber discs and their backing pads are laid down in the EN 13743 standard. The maximum surface speed (maximum operating speed) for fiber discs is 80 m/s.

As they can be combined with a wide range of grain types and backing pad versions, fiber discs have an extensive scope of applications ranging from rough machining to finish grinding of surfaces. The benefits fiber discs offer over abrasive mop discs and grinding discs are the elasticity of the backing, resulting in excellent adaptability, a fine and uniform scratch pattern (compared to grinding discs) and, first and foremost, their more affordable price.

Their downsides in contrast with abrasive mop discs lie in their inferior service life and their relatively high sensitivity to moisture and temperature.

According to the abrasives grain, fiber disc sanding kit include Aluminum Oxide, Silicon Carbide,

Zirconia, Ceramic and so on.

The size of fiber disc include 4', 4.5', 5', 6', 7', 9' and so on.

The grit size of Fiber disc is P16-P320. The most popular grit is P36-P120.

The hole pattern of fiber disc include center round holes and center star shape hole.

The thickness of fiber disc include 0.6mm and 0.8mm.

The application of fiber disc usually include grinding wood, metal.

These general purpose fiber discs include models designed for use on wood, metal, casting, and stainless steel applications. Aluminum Oxide discs are designed for applications such as weld removal, grinding, blending, and polishing. Silicon Carbide discs are ideal for rough surfaces or nonferrous materials such as marble, china clay, fiberglass, enamel, porcelain, quartz, terrazzo, concrete, and epoxy.

Application:

RIKEN RMC adopts the high-density sponge to produce abrasive sponge S5500M, the backing is flexible. Taking advantage of the selected Alo or SIC grain, RIKEN RMC S5500M 80 grit sanding sponge has long sanding life and smooth work surface, especially suitable for all kinds of irregular curved surface polishing.

ZIBO RIKEN has become many well-known international companies’ long-term partners. We believe that achievement in Safety, Health and Environmental performance is a mindset, which begins daily and to be carried out through everything we do; we committed to work together with customers to improve the sanding environment and offer clean/ no dust work environment to sanding workers!

SPONGE abrasives consist of three components: foam, usually made from EVA (ethylene vinyl acetate), PU (polyurethane) or recycled PU waste, a binder resin and abrasive grit made of aluminum oxide, white aluminum oxide, silicon carbide, semi-friable aluminum oxide and so on.

The Advantages of foam abrasives

When sanding with foam abrasives, the focus is not only on removing as much material as possible. It is vital to achieving an absolutely smooth and even result when preparing surfaces for subsequent painting or varnishing. If the goal is to achieve a perfect workpiece surface finish with low scratch depth, applying pressure in two dimensions when sanding (such as using conventional sandpaper) is not enough, for example when using paper-backed abrasives. Instead, pressure needs to be applied in three dimensions. Force can be applied in three dimensions by using the foam as the carrier material in connection with a flexible binder resin. This allows the grit to dissipate the contact pressure average. Advantage: the abrasive grit does not cut into the material as deeply and breaks off less. As such, less material is removed and no sanding through of the material occurs at the edges. Instead, we achieve a homogeneous surface.

Due to their conformability, foam abrasives are the ideal choice for areas that are difficult to access and have profiled surfaces. Hard-to-reach areas, such as door handle depressions, bumpers and radiator grilles, are ideal fields of application for the foam abrasives. Unlike conventional sandpaper, foam abrasives can be folded without creating permanent creases, which allows a consistent sanding pattern due to improved grain consistency without swirl marks.

A combination of soft carrier material and flexible grit bonding reduces clogging of the foam abrasives. Sanding dust is continuously removed from the spaces between the granules. Using more flexible binder resin and optimised distribution with improved abrasive grit, it has been possible to further improve the clogging characteristics. The sponge block sanding pad can therefore be used multiple times.

The foam allows the abrasive to shape itself to the product. With no folds or buckling, the material provides an even pattern free of scratching. A flexible abrasive surface lasts much longer than conventional surfaces, on which the abrasive grains crack apart and break off. With its soft backing material, the foam abrasive does not create pressure spots from fingers. It distributes the force of the sanding across the abrasive surface evenly.

Having a soft and flexible backing makes the foam abrasive continually release abrasive dust. Heat does not build up on the adhesive coating of the foam abrasive as you work. With less heat, there is less load up, and the product lifetime increases. Not only do foam abrasives work wet or dry, you can even wash and reuse them.