Technology - Smirdex Coated Abrasives Industry
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Coated abrasives main components are abrasive grains, backing materials and resins. Grains are the essential materials to specify the main properties of coated abrasives, stock removal and roughness. They are categorised in many different grit sizes, from very fine (P5000) to very coarse (P12).

There are four types of abrasive grains; mainly used: Ceramic, Aluminium Oxide, Silicon Carbide and Zirconia Alumina.
Ceramic Grain (CER)
A tough and hard grain with excellent self-sharpening features, due to its micro-crystalline structure. Ceramic is suitable on Clear Coats, Primers, Putties, Hard Composites, Hard Wood and Metal surfaces.
Fast cutting results, due to the sharpness of the grains
Self-sharpening edges with significantly longer lifespan
High removal rates and increased performance
Aluminium Oxide (ALOX)
An industrially refined, naturally formatting mineral is amongst the toughest and the most hard-wearing materials in the abrasive product family. Many types of Semi friable ALOX grains are available (White Fused, Pink, Brown Fused and Blue Fired), covering a wide range of applications that makes the ALOX grain a universal grain for putties, primers, metals, woods, plastics, lacquers.
Universal grain for many different applications and surfaces
The perfect combination of toughness and hardness
An ideal abrasive for sanding and finishing
Silicon Carbide (SIC)
A synthetic grain produced by mixing silica with coke (Carbon). A very hard and brittle grain that is heat sensitive, dulling quickly on most metals. It is used to sand wood, glass, minerals, ceramics, marble, stone, concrete, as well as polishing lacquer, plastics, brass, bronze, aluminium and steel.
Excellent finishing results
Excellent performance and high cutting rates especially under light pressure
Zirconia Alumina (ZIR)
A mix of zirconium dioxide and aluminium oxide, producing a very tough, self-sharpening grain, breaking down over time and regenerating its sharp cutting edges, providing long life during sanding. Zirconia Alumina is mainly used in hard wood grind and demanding metal processing like stainless steel grinding.
Fast Cutting performance in metal grinding
High-cutting rates across a wide range of hard materials
Excellent grinding performance with prolonged lifespan
Backing types are the base on which abrasive grains are adhered. They support the whole structure of the material and add their own properties in the abrasive process. The backings used in the manufacturing of coated abrasives are:
The different weight of the paper, as well as the latex content, determines the flexibility and waterproof properties of the coated abrasives. The light weight papers are more flexible, while the heavy weight papers are stronger and tear resistant. The addition of 30% latex in the paper, makes the coated abrasive waterproof and suitable for wet sanding applications.
Cloth backing is made of Cotton fibres, or a mixture of Cotton and Polyester fibres, or polyester fibres only. Cloths are tear-resistant and very flexible. According to the density of the yarns, cloths are categorised in more flexible and less strong cloth abrasives (like J-type), or less flexible but very strong cloth abrasives (like X-type).
Extremely thin layer of a polyester special treated backing, very flexible and tear-resistant mainly used for finishing and sanding applications.
Foam backing is a polyether-based material, adhered to the paper or the cloth abrasives, in order to make them suitable for sanding profiled surfaces. Due to the unique absorbance properties of the foam, the finishing result is guaranteed and the final surface is free of deep scratches and irregularities.
The Net Mesh consists of Polyamide and Polyester yarns, creating a special net structured backing. Due to the unique pattern of the combs and mesh combination, this backing is ideal for manufacturing non-clogging coated abrasives with outstanding dust-extraction properties.
Fibre backing is made of vulcanised cotton fibres, creating a very hard and robust backing, with great mechanical strength and heat resistance. It is suitable for coated abrasives in heavy-duty applications.
The percentage of grain surface coverage is of great importance on the clogging and aggressiveness properties of the coated abrasive. The closed or open coating, as well as the use of top Stearate coating, determines the specific use of the coated abrasive on surfaces with different characteristics.
Closed coating
In closed coating structure, the abrasive grains cover approximately 100% of the abrasive’s surface. Thus, the abrasive is more aggressive, with fast stock removal performance, ideal for grinding hard materials. However, the clogging properties are poor and the life span is short during sanding of softer materials, especially in dry sanding process.
Open coating
Open and semi-closed coatings are more suitable for softer materials, because the abrasive grains are covering approximately 75% to 85% of the abrasive’s surface. Due to the open areas on the abrasive’s surface, dust particles are concentrated gradually, extending the endurance of sanding. Therefore, the open coated abrasives have great clogging properties, when used on softer materials.
Special top stearate coating
In order to enhance the longevity of an open coated abrasive on a soft material, an extra top coat is used on the abrasive, called “Stearate”. It is a lubricant that prevents the dust particles from concentrating on the surface of the abrasive, extending the lifetime of the sanding and preventing the abrasive from clogging and loading.
Discover our
flagship products
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750 Ceramic Net
The 750 Ceramic Net delivers better productivity and profitability, since clogging is minimised, offering thus the efficiency of higher performance and better surface finishing.
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740 Ceramic Line
The 740 Ceramic Line offers fast cutting products with improved performance, since a water-based stearate coating provides maximum load resistance, extending the life of the product.
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270 Waterproof
The 270 waterproof consists of high-quality waterproof sanding abrasive papers. Considering the car body repair industry, it is suitable for wet sanding lacquered surfaces, between coats.
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