What type of backing does X-weight sandpaper have?

The correct answer indicates that X-weight sandpaper has a stretch-resistant backing. This type of backing is designed to endure the stresses of sanding while maintaining its shape and structural integrity. X-weight sandpaper typically has a more robust backing than lighter grades, which allows for better performance during sanding tasks. The stretch-resistant quality is particularly important in applications where a consistent sanding surface is necessary, as it prevents the backing from distorting under pressure.

In the realm of sandpapers, the backing influences how the paper behaves during use — thicker and more resilient backings like those found in X-weight sandpaper are essential for heavy or aggressive sanding jobs. This makes it suitable for applications requiring durability and longevity when used on various materials.