320-Grit Diamond Sanding Disc — Surface Preparation & Refinement Summary
A 320-grit sanding disc is a medium-fine abrasive tool designed for controlled material removal, surface leveling, and scratch refinement on marble and other stone surfaces. It bridges the gap between coarse grinding and fine honing, making it a critical step for smoothing surfaces and preparing stone for higher-grit refinement or polishing stages.
Purpose & Function
The 320-grit disc is engineered to remove moderate surface defects such as light scratches, etching, minor lippage, and fabrication marks while producing a uniform, semi-smooth finish. It refines the scratch pattern left by coarser abrasives and establishes a consistent surface texture required for successful honing and polishing.
Typical Use Stage
This disc is typically used in the early-to-mid restoration phase, after heavy correction grits and before fine honing or polishing tools.
Smooths grinder marks and uneven texture
Refines etched or repaired marble
Prepares the surface for 400–800 grit or honing pads
Levels transitions after chip or crack repairs
Key Benefits of a 320-Grit Sanding Disc
Controlled cutting without aggressive gouging
Creates a uniform scratch pattern
Reduces the workload of finer abrasives
Improves final polish quality
Suitable for wet or dry use (depending on disc type)
Consistent performance on marble, limestone, terrazzo, and concrete overlays
Common Applications
Marble countertop restoration
Floor honing preparation
Edge and profile smoothing
Blending repairs and patch work
Surface prep before diamond pads or polishing systems