In-Depth Product Guide · March 2026

Plastic Blast Media for Aerospace & Automotive: Complete Technical Guide

Q: What types of plastic blast media are available?

The three main resin types are urea formaldehyde (softest, lowest cutting action, for most delicate substrates), melamine formaldehyde (medium hardness, the most versatile general-purpose grade), and acrylic (hardest of the three, fastest coating removal, for thicker coatings on less sensitive substrates). Mesh sizes typically range from 12 to 80 mesh, with coarser grades for faster stripping and finer grades for thinner substrates or thinner coatings.

Q: Can plastic blast media be reused?

Yes. Plastic blast media can be reused 20–50 cycles in a recirculating cabinet system with a properly tuned classifier to remove sub-size broken particles and paint contamination. Reuse life depends on blast pressure, substrate hardness, and the type of coating being stripped — thicker, harder coatings accelerate media fracture. Media should be classified and inspected regularly, and the working charge topped up with fresh media to maintain a consistent particle size distribution.

The only commercially available blasting abrasive that strips paint and coatings from thin aluminum aircraft skins, carbon fiber composites, and fiberglass panels without substrate damage — covering resin types, mesh grade selection, aerospace specifications, operating parameters, and substrate compatibility.

Updated March 2026 · 10-minute read · Jiangsu Henglihong Technology Co., Ltd.

3–4 Mohs hardness — gentle enough for composites and thin aluminum

3 Types Urea, melamine, acrylic — each with distinct cutting action

20–50× Recycle cycles in recirculating cabinet systems

Zero Measurable substrate removal on correctly operated systems

📖 Part of our complete abrasive blasting resource library. For a full overview of all media types and selection guidance, visit the Blasting Media: Complete Industry Guide.

1. What Is Plastic Blast Media?

Plastic blast media — also called plastic abrasive media, plastic grit, or by its military designation MIL-P-85891 — consists of angular particles manufactured from thermosetting plastic resins, primarily urea formaldehyde, melamine formaldehyde, and acrylic. The particles are produced by polymerizing the resin under heat and pressure, then crushing and sizing the resulting solid into the angular, blocky particle shape used for blasting.

The defining property of plastic blast media is its very low hardness (Mohs 3–4) — significantly softer than the aluminum, titanium, magnesium, steel, and composite substrates it is used to treat. This means that when plastic media particles impact a coated surface, they break up the paint or coating film through repeated impact energy without being hard enough to cut, scratch, or dimensionally alter the underlying substrate. It is the only commercially available blasting abrasive capable of stripping coatings from thin aluminum aircraft skin panels, carbon fiber reinforced polymer (CFRP) fuselage sections, and fiberglass composite structures without causing substrate damage.

As of March 2026, plastic blast media is mandated or strongly preferred in aerospace maintenance, repair, and overhaul (MRO) operations under specifications including MIL-P-85891, Boeing BSS 7039, Airbus ABP 09-03-006, and SAE AMS 2441. It is also widely used in automotive refinishing, defense vehicle refurbishment, marine composite repair, and the electronics industry for deflashing of plastic-encapsulated components.

Why It Exists Aircraft manufacturers discovered decades ago that conventional mineral abrasives — even at the finest grit sizes — caused unacceptable fatigue damage to thin aluminum aircraft skins when used for paint stripping. The solution was a media soft enough to remove the coating without touching the metal. Plastic blast media was developed specifically to solve this problem, and it remains the only engineering-approved solution for the most sensitive aerospace substrates.

2. Three Resin Types — Urea, Melamine & Acrylic

The three commercially available resin systems produce meaningfully different cutting action, particle toughness, and application suitability. Selecting the correct resin type is as important as selecting the correct mesh size — the wrong resin for the substrate can result in either insufficient coating removal rate or, at the other extreme, surface etching that should not occur.

Urea Formaldehyde

HardnessMohs ~3.0

Cutting actionLightest

Recycle lifeLower

ColorWhite / off-white

Best substrateMost delicate composites, magnesium

Coat removalThin, soft coatings

Melamine Formaldehyde

HardnessMohs ~3.5

Cutting actionMedium — most versatile

Recycle lifeMedium

ColorWhite

Best substrateAluminum airframes, CFRP, fiberglass

Coat removalPolyurethane, epoxy, primer systems

Acrylic

HardnessMohs ~4.0

Cutting actionHighest of the three

Recycle lifeHigher

ColorTranslucent / clear

Best substrateAluminum, steel, harder composites

Coat removalThick, hard coatings, multi-layer systems

For the majority of aerospace paint stripping applications on aluminum airframes, melamine formaldehyde in 16–20 mesh is the workhorse specification. It provides the right balance of coating removal rate and substrate safety for the polyurethane topcoats and epoxy primer systems used on commercial and military aircraft. Urea is reserved for the most delicate substrates or thinnest coatings; acrylic is used when faster stripping of harder or thicker coatings justifies the slight increase in aggression, typically on automotive or ground vehicle components.

3. Mesh Grade Selection Guide

Plastic blast media is sized by US mesh, with coarser grades removing coatings faster at the cost of slightly more surface texture on the stripped substrate, and finer grades producing a gentler action for the most sensitive applications. The practical range for most industrial applications spans 12 to 80 mesh.

Mesh Size	Particle Size (µm)	Coating Removal Rate	Substrate Impact	Typical Application
12–16 Mesh	1,180–1,680	Fast	Low-medium	Thick multi-layer coatings on aluminum and steel, automotive frame stripping
16–20 Mesh Aerospace standard	850–1,180	Medium-fast	Low	Aircraft aluminum skin stripping, polyurethane topcoat and epoxy primer removal
20–30 Mesh Most versatile	600–850	Medium	Very low	CFRP, fiberglass, general composite paint stripping, automotive body panels
30–40 Mesh	425–600	Medium-slow	Minimal	Thin coatings on delicate composites, magnesium components, marine fiberglass
40–60 Mesh	250–425	Slow	Negligible	Ultra-thin coatings, surface conditioning of very sensitive substrates
60–80 Mesh	180–250	Very slow	Negligible	Electronics deflashing, precision plastic component cleaning

Coating removal rate and substrate impact ratings are relative within plastic media at standard operating pressure (2–4 bar). Actual performance depends on resin type, blast pressure, standoff distance, nozzle angle, and coating system composition.

4. Substrate Compatibility

✓

Aluminum Airframes Primary application — no warping or fatigue damage at correct parameters

✓

CFRP / Carbon Fiber Only safe abrasive option — mineral media severs fibers

✓

Fiberglass (GRP) Composite boat hulls, aircraft radomes, panels

✓

Magnesium Alloys Helicopter gearbox housings, aerospace castings

✓

Thin Aluminum Body Panels Automotive hoods, doors — prevents warping

✓

Kevlar / Aramid Composites Defense panels, ballistic structures (urea or melamine only)

△

Carbon or Structural Steel Ineffective for rust or mill scale — use mineral abrasives

△

Titanium Components Acceptable for paint stripping only — verify spec approval

✗

Heavy Rust Removal Insufficient hardness — plastic media cannot remove corrosion

Important Limitation Plastic blast media strips coatings — it does not remove corrosion, rust, mill scale, or hardened deposits. If a substrate has active corrosion beneath the paint layer, plastic media will expose it but cannot treat it. A follow-up treatment with an appropriate rust-inhibiting primer or chemical conversion coating is always required after plastic media stripping on corroded substrates.

5. Aerospace Applications & Specifications

Regulatory and Specification Framework for Aerospace Plastic Blast Media

Aerospace plastic blast media use is governed by a comprehensive set of military, OEM, and industry specifications that define approved media types, operating parameters, and inspection requirements. Key references as of March 2026 include:

MIL-P-85891: The primary US military specification for plastic blast media used in aircraft coating removal. Defines resin type classifications (Type I = urea, Type II = melamine, Type III = acrylic), size grades, and performance requirements.
Boeing BSS 7039: Boeing’s process specification for paint removal from aircraft structures using plastic media blasting, with defined pressure limits, nozzle types, and inspection requirements by substrate type.
Airbus ABP 09-03-006: Airbus equivalent process specification for plastic media blasting on commercial aircraft structures.
SAE AMS 2441: Society of Automotive Engineers specification for plastic media blasting, covering approved media, process parameters, and quality requirements.
DEF STAN 03-16 (UK): UK Ministry of Defence specification for plastic media blasting of military aircraft.

Always verify that both the specific media product and the operating procedure are approved under the applicable OEM specification for the aircraft type before commencing plastic media blasting on certificated aircraft structures.

In aerospace MRO operations, plastic media blasting is used for complete paint removal from aircraft fuselage, wing, and empennage surfaces between scheduled repainting cycles — typically every 5–8 years on commercial aircraft. The process allows paint removal from an entire narrow-body fuselage in 2–4 days, compared to 7–14 days for chemical stripping, with significantly reduced chemical waste and worker exposure.

✈️

Aircraft Paint Stripping

Complete removal of topcoat, primer, and conversion coating from aluminum, CFRP, and composite aircraft structures between scheduled repainting. Melamine 16–20 mesh is the standard specification for commercial aircraft.

🚁

Helicopter Components

Paint stripping from aluminum rotor blades, magnesium gearbox housings, and composite fuselage panels. Urea media is often specified for magnesium to minimize any risk of surface interaction.

🛸

Composite Radomes & Fairings

Removal of radar-transparent paint systems from fiberglass and CFRP radomes without affecting the electromagnetic transparency of the composite structure. Very fine mesh (30–40) at minimum pressure.

🚗

Automotive Body Panels

Paint stripping from aluminum hoods, doors, fenders, and rooflines in automotive refinishing and restoration shops. Prevents the warping and stress that angular abrasives cause on thin-gauge sheet. See our automotive restoration guide for component recommendations.

⚓

Marine Composite Hulls

Antifouling and topcoat removal from fiberglass and composite boat hulls between maintenance cycles. Plastic media avoids the osmotic blister damage that high-pressure water jetting can cause on fiberglass laminates.

💻

Electronics Deflashing

Removal of flash and burrs from plastic-encapsulated electronic components (ICs, connectors, relays) after injection molding. Very fine mesh (60–80) at low pressure — the only abrasive process that achieves this without component damage.

6. Automotive & Refinishing Applications

Beyond the aerospace sector, plastic blast media has established a strong position in automotive restoration, professional refinishing, and defense vehicle refurbishment. The common thread across these applications is the need to remove paint from substrates that would be damaged by conventional abrasive blasting.

In classic and vintage car restoration, thin-gauge steel and aluminum body panels are particularly vulnerable to heat and mechanical stress during blasting. Coarse mineral abrasives at normal blast pressures can warp panels to the point where they require expensive straightening — sometimes beyond economical repair. Plastic media at the correct parameters strips the paint without inducing substrate stress, leaving the original panel geometry intact for priming and repainting. For panels with multiple layers of filler, primer, and topcoat, a 12–20 mesh melamine or acrylic media is typically the most efficient specification.

Military and defense vehicle refurbishment programs have also adopted plastic media blasting extensively for stripping camouflage coatings from aluminum-bodied vehicles (HMMWV, armored personnel carriers, light tactical vehicles) before repainting or corrosion inspection. The process is faster than chemical stripping, generates less hazardous waste, and causes no substrate damage in fleet-scale operations.

7. Operating Parameters — Pressure, Distance & Angle

Getting the operating parameters right is critical with plastic media. Unlike mineral abrasives where the main concern is achieving sufficient aggression, with plastic media the concern is equally about not exceeding the threshold that causes substrate damage. Operating outside the recommended envelope — particularly at excessive blast pressure — can cause surface stress, etching, or micro-cracking of sensitive composites.

Recommended Operating Envelope for Plastic Blast Media

Blast Pressure 2–4 bar (29–58 psi) Never exceed 4 bar (58 psi) on aerospace aluminum or CFRP. Higher pressure increases substrate stress without proportional improvement in stripping rate.

Standoff Distance 150–250 mm (6–10 in) Closer distances concentrate impact force and risk substrate damage on sensitive panels. Maintain consistent distance throughout the operation.

Blast Angle 30–60° to surface Oblique angle (45° typical) promotes coating removal while reducing the direct impact force on the substrate. Avoid 90° (perpendicular) blasting on thin panels.

Nozzle Type Venturi (tungsten carbide or boron carbide) Plastic media is gentler on nozzles than mineral abrasives. Standard Venturi nozzles achieve good media velocity at lower pressures. Replace nozzles when internal diameter exceeds 1.6 mm over nominal size.

Air Quality Oil-free, dry compressed air Moisture causes plastic media to clump and lose effectiveness. Dew point below −10°C at the nozzle. Oil contamination deposits on the stripped substrate and prevents primer adhesion.

Substrate Temperature Above dew point, below 50°C Cold surfaces promote moisture condensation. Hot surfaces (direct sun exposure) can cause composite substrates to be more susceptible to impact damage. Work in controlled temperature environments where possible.

Process Qualification Reminder For aerospace applications, the complete plastic media blasting process — media type, mesh size, blast pressure, nozzle size, standoff distance, and blast angle — must be formally qualified against the applicable OEM specification before production use. A qualified process that falls outside the approved envelope on any parameter is non-compliant regardless of the visual result.

8. Plastic Media vs Mineral Abrasives

The comparison between plastic blast media and mineral abrasives such as aluminum oxide or garnet is not about which is superior in absolute terms — it is about which is appropriate for the specific substrate and task. They serve completely different functions and are not interchangeable on sensitive substrates.

Coating removal on composites and thin aluminum: Plastic media wins by default — no mineral abrasive can do this safely. Using aluminum oxide on CFRP at any grit size will sever carbon fibers and cause sub-surface delamination invisible to visual inspection.
Rust and mill scale removal from structural steel: Mineral abrasives win — plastic media has insufficient hardness to remove corrosion or scale. It will simply bounce off heavy rust deposits without effect.
Anchor profile creation for heavy coatings: Mineral or metallic abrasives are required — plastic media produces a negligible surface profile inadequate for heavy-build epoxy or zinc-rich primer adhesion on structural steel.
Cost per m²: Plastic media has a higher unit price than most mineral abrasives and lower recyclability (20–50 cycles vs 100–200 for aluminum oxide). However, for the applications where it is the correct specification, there is no alternative — the comparison is irrelevant.
Waste management: Spent plastic media mixed with stripped paint is non-hazardous waste in most jurisdictions, simplifying disposal. However, if stripping lead-containing paint, the spent media becomes contaminated hazardous waste regardless of the media type.

For a comprehensive side-by-side comparison of plastic media against all major abrasive types across key technical parameters, see the Blasting Media Comparison Chart. For guidance on selecting the right media for your specific substrate and application, refer to the complete blasting media selection guide.

9. Frequently Asked Questions

What is plastic blast media used for?

Plastic blast media is used to strip paint, coatings, and adhesives from substrates that cannot tolerate the aggression of mineral or metallic abrasives. Primary applications are thin-gauge aluminum aircraft skin panels, carbon fiber reinforced polymer (CFRP) and fiberglass composite aircraft structures, magnesium aerospace components, and thin aluminum automotive body panels. It removes coatings without measurably altering substrate dimensions, inducing warp, or severing reinforcing fibers — making it the only engineering-approved abrasive for the most sensitive aerospace and composite applications. It is also used in electronics for deflashing of plastic components and in marine composite maintenance.

What types of plastic blast media are available?

Three main resin types are commercially available. Urea formaldehyde (Type I per MIL-P-85891) is the softest, with Mohs hardness ~3.0, and is used for the most delicate substrates — magnesium, very thin coatings, and the most sensitive composites. Melamine formaldehyde (Type II) at Mohs ~3.5 is the most versatile and widely used, suitable for aircraft aluminum skin stripping and most composite applications. Acrylic (Type III) at Mohs ~4.0 has the highest cutting action of the three and is used for thicker, harder coatings on less sensitive substrates. Mesh sizes range from 12 to 80 mesh across all resin types.

Will plastic blast media damage aluminum?

Correctly specified and operated plastic blast media does not damage aluminum substrates — that is the fundamental reason for its existence. At the correct blast pressure (2–4 bar), correct standoff distance (150–250 mm), correct blast angle (30–60°), and with the appropriate resin type and mesh grade, plastic media strips paint and coatings from aluminum without measurable dimensional change, surface stress, or roughening of the base metal. Exceeding the approved pressure or operating closer than the specified standoff distance, however, can cause surface stress on thin panels. Always follow the applicable OEM process specification for aerospace aluminum applications.

Can plastic blast media be reused?

Yes. In a recirculating cabinet blast system with a properly tuned classifier, plastic blast media typically achieves 20–50 reuse cycles before the working particle size and condition fall below acceptable thresholds. The classifier continuously removes sub-size broken particles and paint contamination from the working charge. Recycle life depends on blast pressure (higher pressure accelerates fracture), the hardness of the coating being stripped, and the resin type (acrylic is toughest and lasts longest). The working charge should be regularly inspected and topped up with fresh media to maintain consistent stripping performance.

Can plastic blast media remove rust?

No. Plastic blast media at Mohs 3–4 has insufficient hardness to remove rust, mill scale, or hardened corrosion deposits from metal surfaces. It will strip the paint or coating over a corroded area, exposing the corrosion beneath, but it cannot treat the corrosion itself. For rust removal from carbon steel, angular mineral abrasives such as aluminum oxide or garnet are required. Plastic media and rust removal serve completely different purposes and are not interchangeable.

Related Resources

Explore the full blasting media resource library from Jiangsu Henglihong Technology for further selection guidance and application-specific recommendations:

Blasting Media: Complete Industry Guide — full overview of all media types and applications
Types of Blasting Media: Complete Guide — how plastic media compares to all other abrasive types
How to Choose the Right Blasting Media — step-by-step selection framework and substrate matrix
Aluminum Oxide Blast Media — angular mineral abrasive for steel and hard substrate preparation
Glass Bead Blasting Media — spherical media for smooth finishing on aluminum and stainless
Garnet Blasting Media — low-dust mineral abrasive for steel and pipeline applications
Silicon Carbide Blast Media — for glass, ceramics, and the hardest substrates
Blasting Media for Automotive Restoration — component-by-component media recommendations
Steel Grit vs Steel Shot — metallic abrasives for high-volume production blasting
Blasting Media Comparison Chart — side-by-side data for all major abrasives
Blasting Media Cost Guide & ROI Analysis — cost-per-m² benchmarks
Eco-Friendly Blasting Media — silica-free and low-dust options for regulated environments
Industrial Surface Prep: Best Blasting Media for Metal
Blasting Media Safety Guide: Silica Risks & PPE

Source Plastic Blast Media from a Trusted Manufacturer

Jiangsu Henglihong Technology supplies urea, melamine, and acrylic plastic blast media in MIL-P-85891 grades, with full documentation and reliable sea freight export to North America, Europe, the Middle East, and beyond.

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