Description

Product Description of the Mirka Ultimax Antistatic Paper Wide Belts

Mirka's revolutionary new abrasive for belt sanding, the long-life and antistatic Ultimax Black brings new technologies for sanding hard materials and hard wood surfaces.

Combining a thick, high quality backing paper with a new silicon carbide grain and patented selective coating technology, the Mirka Ultimax Black gives a better and more consistent finishing quality even in the coarser grits. Highly resistant to breakage, folding and twisting, the antistatic Ultimax Black delivers exceptional sanding quality from start to finish with reduced material waste.

The surface cavities prevent clogging and reduce the temperature of the sanding process while increasing the surface pressure on each single sanding grain, helping the abrasive stay sharp for longer, contributing to a high removal rate and a lower scratch pattern. Suitable for sanding, intermediate sanding and pre-polish sanding of materials ranging from hard wood to soft wood, MDF, HDF and melamine surfaces.

Technical Specifications
• Grain: Silicon carbide
• Color: Black
• Backing: Antistatic T-paper
• Bonding: Resin over resin/Antistatic
• Grit range: P80-P1000
• Coating: Semi-open with Selective Coating™

Data Sheet for the Wide Belt Calculator - Mirka Ultimax Black Antistatic Paper Wide Belts

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Why Use Aluminium Oxide?

Mirka Ultimax Antistatic Paper Wide Belts have an aluminium oxide grit, which is considered to be a good all-round or general purpose grain that works well on various applications.

In disc form (i.e. velcro-backed, fibre or flap discs) it is best suited to metalworking, such as aluminium and carbon/mild or stainless steel, and leaves a finer scratch pattern than other more aggressive products such as zirconia. This, in combination with its wide range of grades (generally between P36 - P400) means that it is often used prior to beginning some form of polishing process. There are also some benefits in woodworking, for example fibre discs are quite common in the floor sanding industry for the initial stages, with heavy stock removal requiring coarser grits.

Aluminium oxide is also quite common with abrasive belts, and can have specific features to improve performance on particular substrates. For example - when working on soft woods/metals it can often begin to transfer to the belt and quickly cause it to "clog" or dull, and so a more suitable material to use would be one with either a semi-open or open coat. With these there is less abrasive on the belt which leaves more space between the grains, the idea being that the loading would occur here rather than on the grit itself (the other effect of this is however that due to less abrasive being present the belt is in turn less aggressive.) In reverse a closed coat means that 100% of the surface of the belt is covered with the grain, so will take off more stock but is recommended only for hard woods and metals that are not prone to clogging. Aluminium oxide belts have either a paper or more durable cloth/polyester backing, with paper primarily being either a narrow or wide belt and most popular in woodworking, while cloth/polyester are more prominent in metalworking and available in a greater variety of sizes, again including narrow and wide but also file belts and portable sander belts.

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