What Abrasive Is Used for Wire‑Sawing of Optical Glass?
Green Silicon Carbide (GC) is the preferred abrasive for optical glass wire‑sawing. It delivers high purity, sharp grain edges, good self‑sharpening performance, Mohs hardness 9.2‑9.5, powerful cutting ability and stable chemical properties.
Its low‑impurity content and tight particle‑size distribution minimize edge chipping, notches and subsurface cracks to produce flat cut surfaces. Black silicon carbide has higher impurities and is unsuitable for high‑precision optical glass cutting.
Main Physical‑Chemical Specifications
SiC ≥99.0%; F.C≤0.20%; Fe₂O₃ ≤0.15%
Mohs Hardness: 9.2‑9.5; True Density: 3.20‑3.22 g/cm³
Common Grit Sizes for Sawing Slurry Abrasive
FEPA European Standard: F400, F500, F600, F800, F1000, F1200
JIS Japanese Standard: #600, #800, #1000, #1200, #1500
Processing Flow
Green silicon carbide powder mixed with suspension liquid to prepare cutting slurry → Multi‑wire saw → Optical glass slicing → Cleaning & inspection
