4" x 24" Aluminum Oxide Belts
Resin-on-resin bonded aluminum oxide sanding belts are perfect for the toughest wood sanding jobs. The belts feature a heavy duty 100% cotton backing for increased working life. All belts are open coat, preferred for sanding off painted or finished surfaces as the belts resist "loading up" with removed material.
|Belt Size||4" x 24"|
|Grit||60, 80, 100, 120|
|Abrasive Type||Aluminum Oxide|
over 2 years ago
Closed Coat means that close to 100% of the backing on a coated abrasive product is covered in abrasive grain. Closed Coat products are more aggressive and cut faster because the grit particles are grouped more closely together.They also provide the best finishes because there are no gaps between the grains. You receive the full benefit of the work that the abrasive grain is capable of doing.
SEMI OPEN / OPEN COAT
Semi-Open and Open Coat means that there is more space between grain particles on the abrasive product. Semi-Open Coat usually refers to about a 30% reduction in the amount of grain on the backing and Open Coat usually means that there is about 50% coverage. Semi-Open and Open Coat products have less grain on the backing, which results in less cutting power per grit designation...they are not as aggressive as a Closed Coat abrasive product. In addition, Semi-Open and Open Coat products have gaps in their grain coverage, so the finishes they provide are not quite as even and will tend to fall on the coarse end of the finishing scale for that particular grit.
The purpose of the sandpaper is to remove the previous tool marks. It's the grade of the paper that's critical, not the so-called open-coat. I find the closed-coat the best way to finish any wood project
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