What is the difference between open-coat and closed-coat sandpaper?

The distinction between open-coat and closed-coat sandpaper lies in the concentration of the abrasive particles adhered to the backing material. Closed-coat sandpaper features a dense distribution of abrasives, providing a smoother surface finish and efficient material removal. This dense abrasive coverage makes it ideal for smoothing surfaces and finishing work.

In contrast, open-coat sandpaper has a more spaced-out arrangement of abrasives, meaning there are gaps between the grains. This design allows for better dust removal and reduces clogging when sanding softer materials or woods. The larger gaps also make this type of sandpaper suitable for applications where dust accumulation might be a concern.

Understanding this difference is crucial for selecting the appropriate sandpaper for specific tasks, ensuring an efficient and effective sanding process.