Flexible Grinding for Complex Surfaces: PVA Rubber Mounted Points Deliver Mirror Finish Without Damaging Substrate

For precision finishing tasks such as mold polishing, deburring metal parts, jewelry refinement, and glass edge smoothing, operators often face a trade-off: hard grinding points cut effectively but leave black marks and scratches; soft felt or cloth wheels require messy polishing compounds and wear out quickly.

To bridge this gap, Signi Industrial(Shanghai)co.,Ltd today launches its Abrasive PVA Rubber Mounted Points – a unique class of flexible grinding tools that combine the cushioning effect of PVA sponge with the cutting power of abrasive grains.

What Are PVA Rubber Mounted Points?

PVA (Polyvinyl Alcohol) rubber mounted points are composite tools made of PVA sponge matrix bonded with abrasive powders (alumina, silicon carbide, or diamond). Their distinctive three-dimensional porous structure offers:

Elasticity: Deforms under pressure to conform to curved surfaces – prevents over-cutting

Dry or wet use: Can be used with coolants or grinding fluids

Self-dressing: Worn abrasive exposes new grains; sponge structure resists loading

Key Advantages

1. Flexible Grinding – Won't Damage Substrates

Traditional mounted points grind "hard against hard," risking deep scratches or gouging. PVA rubber points provide a buffering effect – essential for heat-treated tool steels, plated surfaces, and soft metals (copper/aluminum). They remove burrs and oxides without harming the base material.

2. Cool Cutting – No Blackening

When grinding stainless steel or titanium, heat buildup causes "burning" and black discoloration. The porous PVA sponge structure allows air and coolant to enter the grinding zone, providing effective heat dissipation. In testing, grinding stainless steel for 30 seconds with a PVA point resulted in minimal temperature rise and no blue/black discoloration.

3. Excellent Reach for Complex Contours

Standard shank diameters of 3mm and 6mm fit all high-speed pneumatic/electric rotary tools (recommended speed: 10,000-25,000 RPM).