The Square Fused Silica Spacer is a miniature precision shim with a dimension of 3 x 3 x 1.5mm, manufactured from high-purity fused silica with a grade -1 negative precision tolerance. The finely ground, polishable surface provides high plane parallelism and is free of chipping, scratches and bubbles, ensuring stable seating and accurate spacing in precision assemblies. With high UV transmittance, an ultra-low thermal expansion coefficient and excellent resistance to high temperature and acid and alkali, the spacer maintains its geometry under thermal cycling with negligible deformation. Its excellent insulation and consistent batch quality make it a reliable component for optical and testing equipment.

• High-purity fused silica material: The pure material provides clean optical behavior and dependable consistency.
• Finely ground or polishable surface: The smooth face supports precise contact and can be polished for optical applications.
• High plane parallelism: Parallel faces deliver accurate spacing and stable seating in assemblies.
• Free of chipping, scratches and bubbles: The defect-free body protects adjacent optical components during use.
• Ultra-low thermal expansion: High UV transmittance, temperature and acid-alkali resistance, minimal thermal deformation and excellent insulation support stable performance.

The Square Fused Silica Spacer is designed for precision optical and testing equipment that requires accurate spacing and stable alignment. It is widely used as a spacer shim in optical assemblies, maintaining precise gaps between lenses, mirrors and detectors. In testing equipment, the spacer supports components at controlled heights, ensuring repeatable measurement geometry. The component also functions as a positioning pad in precision instruments, providing a stable, inert platform that does not scratch optical elements. Additionally, the spacer is adopted in semiconductor and laboratory fixtures, where its negative tolerance and thermal stability keep assembly clearances consistent across temperature changes.

• Precision cutting and grinding for tiny blanks: Controllable negative tolerance ensures stable assembly clearance.
• Negligible deformation under temperature change: The spacer keeps optical components aligned in thermal cycling environments.
• No scratch on optical parts: The smooth, defect-free surface protects delicate components during assembly.
• Mass production with high consistency: Uniform quality supports volume applications with repeatable results.
• Customizable processing: Single or double side polishing and slotting are available on request.