Product Description of the Wide Belt Calculator - Sia 2920 Aluminium Oxide Heavy-Duty Cloth Wide Belts2920 siawood is ideal for manual sanding and belt sanding in plywood and softwood board production, and offers high stock removal rates, long life and excellent finish in coarse to fine sanding applications.
• Grain: Aluminium oxide
• Backing: Y-wt cloth, X-wt cotton-cloth
• Bonding: Resin over resin
• Grit range: P24-320
• Coating: Electrostatic open P24 – P120 / Closed P150 – P320
• Flush sanding of edges
• Coarse sanding in plywood manufacturing
• Intermediate sanding in plywood manufacturing
• Coarse sanding of laminated softwood panels
• Intermediate sanding of laminated softwood panels
• Fine sanding of laminated softwood panels
• Sanding and removal of paints and lacquers
• Perfect surface finishes thanks to TopTec
• Dust-free process: antistatic construction gives low dust formation on belt, workpiece and machinery
• Suitable for long periods of use thanks to very robust backing and optimised grit spreading technology
• High removal rate when working on softwood and hardwood with coarser grits
• Soft woods
• Hard woods
Data Sheet for the Wide Belt Calculator - Sia 2920 Aluminium Oxide Heavy-Duty Cloth Wide Belts
Why Use Aluminium Oxide?Sia 2920 Aluminium Oxide Heavy-Duty Cloth 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.