Materials
Micronized Rubber Powder
What separates ultra-fine MRP from coarse crumb rubber, how our ambient grinding line reaches 170 mesh, and the four application areas it serves.
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Our Material
Micronized Rubber Powder
Ultra-fine rubber powder milled from TBR tread, supplied in four grades from 180 down to 105 micron against a certified specification.
105 – 180Micron Grades
1.13 – 1.15Specific Gravity
1.5% maxMoisture
TBR TreadFeedstock
Polymer
Natural Rubber
Specific gravity
1.13 – 1.15
Rubber hydrocarbon
45 Min %
Carbon black content
32 Max %
Acetone extract
14 Max %
Moisture content
1.5 Max %
Precision-milled rubber powder for compounding
Micronized rubber powder is crumb rubber taken several stages further: milled down until the particle size is measured in microns rather than millimetres, then classified on fine sieves to hold a tight distribution. AP Rubber Group produces it from truck and bus radial tread, which carries a higher natural rubber fraction than passenger car casings.
The four grades are named for their particle size in microns — AP MicroRub 180, 150, 125 and 105. Each is specified on two sieves rather than one, so the distribution is bounded at both ends instead of only at the top. Specific gravity is 1.13 to 1.15, rubber hydrocarbon a minimum of 45%, and moisture no more than 1.5%.
At this fineness the powder disperses into a host compound rather than sitting in it as discrete granules, which is why it is used as a partial replacement for virgin polymer in tyre compounds, conveyor belting, moulded goods and sealants. Finer grades carry a higher ash specification, and the trade-off between fineness and ash is the usual basis for grade selection.
Available grades
Four milled grades, named for particle size in microns. Each is specified on two sieves, and each has its own data sheet.
AP MicroRub 180 · 180 µm
Photographed range: 0.10 mm · 0.12 mm · 0.14 mm · 0.16 mm · 0.18 mm · 0.20 mm
AP MicroRub 180
The coarsest micronized grade and the lowest ash specification of the four. The usual starting point where a compounder wants powder behaviour without paying for extreme fineness.
- Sieve passing 60 mesh (250 micron)
- 95 Min%
- Sieve passing 80 mesh (180 micron)
- 85 Min%
- Ash content
- 12 Max%
- Data sheet
- AP/QA/TDS/05
AP MicroRub 150
A general-purpose fine grade for rubber compounding, belting and moulded goods, where dispersion matters but the surface finish is not the limiting requirement.
- Sieve passing 80 mesh (180 micron)
- 95 Min%
- Sieve passing 100 mesh (150 micron)
- 85 Min%
- Ash content
- 13 Max%
- Data sheet
- AP/QA/TDS/06
AP MicroRub 125
A high-precision grade for compounds where the powder must disappear into the matrix — sealants, coatings and parts with a tight surface tolerance.
- Sieve passing 100 mesh (150 micron)
- 95 Min%
- Sieve passing 120 mesh (125 micron)
- 85 Min%
- Ash content
- 14.5 Max%
- Data sheet
- AP/QA/TDS/07
AP MicroRub 105
The finest grade produced, at 105 micron. Specified for the most demanding dispersion requirements, and carrying the highest ash specification as a consequence of the additional milling.
- Sieve passing 120 mesh (125 micron)
- 95 Min%
- Sieve passing 140 mesh (105 micron)
- 80 Min%
- Ash content
- 16 Max%
- Data sheet
- AP/QA/TDS/08
Grade comparison
Typical properties — all grades
Where Micronized Rubber Powder is used
Enhancing performance across industries.
PCR / TBR Tyres
Compound filler for new tyre production
Conveyor Belts
Improves wear resistance in belt compounds
Solid Tyres
Adds resilience to solid industrial tyres
Brake Pads
Friction material for brake components
Moulded Parts
Precision moulded rubber components
Rubber Gaskets
Seals and gaskets with consistent density
How it is made
- 1
TBR tread
Truck and bus radial tread is selected as feedstock for its natural rubber content.
- 2
Shredding
Tread is reduced to chip ahead of granulation.
- 3
Granulation
Chip is granulated and the steel and fibre fractions are separated out.
- 4
Micronization
Granulate is milled down until particle size is measured in microns.
- 5
Fine classification
Powder is screened on two sieves to bound the distribution at both ends.
- 6
Quality check
Each batch is tested to ASTM D-297, D-1817, D-5644 and D-6370 before release.
Why choose APR Micronized Rubber Powder
Circular by Nature
Turning end-of-life tyres into valuable resources
20+ Years
of recycling excellence
Global Supply
Serving customers worldwide
Advanced Processing
Consistent quality through modern technology
Trusted Partner
Built on quality, reliability and commitment
Frequently asked questions
What is micronized rubber powder?
Micronized rubber powder is recycled tyre rubber milled to a particle size measured in microns and classified on fine sieves. It is fine enough to disperse into a host compound rather than remaining as discrete granules.
What grades are available?
Four grades: AP MicroRub 180, 150, 125 and 105. The number is the particle size in microns, not the mesh count — AP MicroRub 180, for example, is specified at 85% minimum passing an 80 mesh (180 micron) sieve.
Is the grade number a mesh size or a micron size?
A micron size. The corresponding sieves are 80 mesh for the 180 grade, 100 mesh for 150, 120 mesh for 125 and 140 mesh for 105. Both figures appear on each data sheet.
What feedstock is used?
Truck and bus radial (TBR) tread. TBR carries a higher natural rubber composition than passenger car radial tyres, which is what makes a higher-quality powder.
Why does ash content rise on the finer grades?
Additional milling raises the proportion of non-rubber residue in the finished powder. Ash is specified at 12% maximum for the 180 grade, rising to 16% maximum at 105 micron. Selecting a grade is usually a trade-off between fineness and ash.
Can AP Rubber Group provide custom particle sizes?
Yes. Custom grades can be produced against a written specification. Contact the team with your target particle size, ash limit and intended application.
Ready to source micronized rubber powder?
Send us your target grade, volume and application. We will come back with pricing, the matching data sheet and a sample where useful.
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