Resin-bonded vibratory media

Identity and related consumables

Washington Mills’ DPLD40 web page gives 68 lb/ft³ without naming the measurement basis. Its brochure gives 72 lb/ft³ bulk density. Products & Services, plastic table Packed bodies leave spaces within the measured bulk volume, so neither entry establishes the solid material density. Washington Mills identifies a polyester resin body. Rösler describes molding resin, abrasive and additives, followed by curing and thermal post-treatment. Rösler plastic media DURAMEDIA Plastic

The following consumables have different identities even when their names overlap.

See Finishing process references for the broader process context.

Product designations and disclosed composition

Synthesis. The manufacturer and complete grade designation matter. The same numeral, color, or word such as "fine" does not establish equivalent abrasive grain size, composition, or measured roughness across products.

Synthesis. An SDS ingredient band cannot supply missing abrasive purity, grain size, or resin percentage. Subtracting the disclosed ingredients from 100% would not identify undisclosed fillers or establish a manufacturing formulation. The historical DPLD group sheet also does not establish that every current lot has identical composition.

Density and finish descriptions retain their source basis

The table preserves a conflict within Washington Mills' public documents. The brochure explicitly labels its values bulk density. The web page gives pounds per cubic foot without naming the measurement method. Neither source explains the discrepancy. Product page Brochure, plastic table

The web page describes DPLD10 as very mild cutting, DPLD40 as fast cutting with a matte finish, and DPLD40MC as more aggressive than DPLD40. These are supplier comparisons, not universal cut-rate classes. Its "low micro-inch" description for DPLD10 supplies no numerical limit, roughness parameter, or test conditions. DURAMEDIA Plastic

Kramer's KV SDS prints 85–90 in a field headed "Specific Gravity (H2O = 1)." The entry has no supporting method and is not labeled lb/ft³. It remains an unresolved source entry, not an adopted material or bulk density. The sheet provides no hardness. KV SDS, physical properties

Synthesis. Material density concerns the body itself. Bulk density concerns a quantity of packed shapes and includes spaces between bodies. Internal pores are a separate issue from those inter-body spaces. Specific gravity is a ratio to a reference density. None of these quantities alone establishes contact pressure or cutting performance. The plastic table's finish images have no numerical axes or stated test basis, so they do not establish Ra, Rz, removal rate, or media life. Brochure, plastic table

Shape, nominal dimensions, and lodging

Kramer's dimensional tables use drawing labels A, B, and C. Selected entries illustrate why a shape name and a single size are insufficient. Dimensions below retain the catalog's inch values and letter labels. Plastic tumbling media, shape tables

These combinations are marked S, standard stock with a 50 lb minimum. NS means non-standard stock with conditional availability or manufacture. These catalog designations establish neither dimensional tolerances nor current inventory. Shape-table footnotes

Rösler describes rounded cone edges after running-in, even wear of tetrahedral pyramids, and double wedges that retain useful sharp geometry during use. These are shape-specific descriptions, not dimensional wear curves or guarantees against lodging. Plastic-media shape descriptions

Synthesis. Access, retention, and separation are different geometric questions. A tapered body can enter an opening tip first and lodge farther in. Orientation, bore depth, blind ends, slots, threads, and several bodies together can alter retention. Worn dimensions and broken pieces can differ from new nominal sizes. A screen opening that separates free media from parts does not prove that cavities contain no retained media. One catalog dimension cannot establish a jamming-free process.

Compatibility, wear, and surface limitations

The DPLD group SDS reports water insolubility, unavailable density in g/ml, and reactions with strong acids and strong oxidizing agents. Water insolubility does not measure swelling, liquid uptake, dimensional stability, or compatibility with an arbitrary finishing compound. The sheet's non-classification rationale refers to the non-inhalable product form, and it separately discusses dust hazards. These statements do not characterize used media, slurry, or workpiece contamination. SDS, sections 3, 7–10, and 16

Synthesis. Lower-density media can be useful where workpiece damage limits a process, but the resin label alone cannot establish zero embedding, no transferred residue, or a surface ready for plating, anodizing, welding, or bonding. Those outcomes depend on the exact medium, liquid chemistry, workpiece material, machine motion, wear condition, and subsequent cleaning. A marketed pre-plate grade is not an acceptance result for a particular coating specification.

Source versions and coverage limits

Reviewed on 29 October 2026 PDT. Web pages are retrieval snapshots. Washington Mills' six-page Products & Services brochure has a 2022/11 upload path but no identified technical revision date. Brochure The DPLD group SDS is revised 13 November 2015, despite its 2023/07 upload path. DPLD SDS Kramer's KV SDS is revised 1 January 2021. KV SDS Upload dates do not prove formulation currency. The public Washington Mills technical-data portal requires registration, so its gated sheets are outside this reference's coverage. Technical-data portal

The available public evidence does not establish grade-specific material density, pore fraction, dimensional tolerances, abrasive size distributions, resin cure chemistry, measured swelling, or comparable cut-and-wear tests. No universal bowl fill, media-to-part ratio, amplitude, pressure, cycle time, chemical recipe, replacement interval, or customer qualification follows from this reference.