Plastic mass finishing medium

Overview
Rösler plastic finishing media are polymer-bonded abrasive media designed as a gentle, high-performance alternative to ceramic media in mass finishing (vibratory finishing). Their lower density and specific formulations allow consistent, scratch-free surface finishes even with larger media sizes, making them suitable for delicate components and sensitive surfaces.

Applications

• Deburring and edge radiusing
• Surface metal removal and cleaning
• Preparing workpieces for polishing, plating, or anodizing (pre-plate finishing)
• Burnishing and polishing
• Processing of softer metals (brass, aluminum, copper), wood and plastic parts
• Specialized use in medical technology (e.g., endoprosthetic implants) and aerospace applications

Advantages

• Approximately half the weight of ceramic media, reducing impingement forces on parts
• Resistant to fracturing and chipping under high mechanical impingement
• Enables controlled material removal with high-quality surface finishes
• Large media sizes can be used without damaging sensitive or thin-walled components
• Different formulations (often color-coded) for levels of metal removal, fine finishing, or pre-plate finishing
• Non-foaming (“N”) versions available for improved process stability and reduced contamination

Manufacturing & Quality Assurance
Plastic finishing media are produced from a mixture of synthetic resin (polymer bonding system), abrasive grains and additives via a casting process. Abrasive content can reach up to 75 percent depending on the application. After curing, a controlled thermal post-treatment enhances wear characteristics and overall performance. Tight production tolerances ensure consistent batch-to-batch quality for reliable results in cleaning, deburring, burnishing, polishing and flash removal applications.

Available shapes (overview)

• Cone (K) — Grinding wheel shape for damage-sensitive components; circumferential base edge rounds off during running-in for gentle, mark-free treatment; good separation/rolling properties.
• Cone - round (KR) — Rounded tip and bottom edge after preconditioning for particularly gentle processing and fine final surfaces.
• Pyramid (P) — Four triangular sides wear evenly, reduce abrasive clogging; excellent for deburring and grinding; edges and tips access most surface areas.
• Tristar pyramid (PDZ) — Pyramid trident suitable for gear contours, slots and tight radii; low weight benefits thin-walled components.
• Pyramid - square base (PQ) — Square-base pyramid provides eight circumferential functional edges, allowing complete machining of small or geometrically difficult areas.
• Paraboloid (PA) — Primarily a smoothing grinding wheel with good sliding properties for very even material removal and gentle treatment.
• Double wedge (DK) — Angular, pointed geometry for deburring; reaches slots, threads and tight radii; remains usable and sharp-edged even after prolonged use.
• Lens (L) — Good sliding properties, especially for very soft materials; leaves damage-free, even, high-quality surface finishes.
• Quinto (QZ) — Combination of flat surfaces and curves; machines workpiece surfaces, tight radii, through-holes and slots effectively.

Frequently asked questions (key points)

• What are they? — Polymer bonding system combined with abrasive materials for gentle surface processing in vibratory finishing.
• How are they manufactured? — Casting of a resin/abrasive compound in molds, with curing and thermal post-treatment; often color-coded by performance.
• What properties distinguish them? — Softer and more elastic than ceramic media, lower density enables controlled removal and high-quality finishes.
• How to select size/shape? — Depends on application, machine type and desired finish: larger media increase general removal, smaller media are for fine finishing and detailed geometries.
• Where are they suitable? — Aluminum, magnesium, zinc die-cast, brass, copper, some ferrous metals, also for wood/plastic parts; used for deburring, cleaning, polishing, pre-plate finishing and surface prep.
• How do they compare to ceramic media? — Ceramic is more aggressive due to higher density; plastic media are gentler and reduce risk of damaging delicate parts while modern formulations extend applicability.
• What about N-media? — Non-foaming versions provide higher process stability, reduce contamination and resources consumption, and lower processing costs.

Caractéristiques / spécifications techniques

• Base composition: polymer (synthetic resin) bonding system with abrasive grains and additives
• Abrasive content: up to approximately 75% (depending on formulation)
• Density: significantly lower than ceramic media (approximately half the weight), resulting in reduced impingement pressure
• Manufacturing: casting process into molds, curing and controlled thermal post-treatment for enhanced wear properties
• Available shapes: Cone (K), Cone - round (KR), Pyramid (P), Tristar pyramid (PDZ), Pyramid - square base (PQ), Paraboloid (PA), Double wedge (DK), Lens (L), Quinto (QZ)
• Formulations: multiple performance grades (color-coded) for general metal removal, fine finishing, pre-plate finishing; also available in non-foaming “N” version
• Typical applications: deburring, edge radiusing, surface metal removal, cleaning, polishing, burnishing, preplate finishing, surface preparation for plating/anodizing
• Suitable materials: brass, aluminium, copper, certain ferrous metals, magnesium, zinc die-cast, wood and plastic parts; specialized formulations for medical implants (cobalt-chrome, titanium) and high-energy mass finishing for hard materials
• Performance notes: resistant to fracturing/chipping, reliable batch-to-batch tolerances for consistent finishing, cost-effective service life comparable to ceramic abrasives