Rubber granule sizes: how to choose a grade
Bedrock offers nominal 0.5–2, 1–3, 2–4 and 2–5 mm granules. Match the range to your process specification. A size label alone does not establish application suitability.
Explore the questionsFour ranges, overlapping sizes
Read both numbers
The lower and upper size labels describe a nominal band, not a guaranteed result for every particle.
Compare the limits
Agree permitted undersize and oversize, plus any intermediate sieve requirements.
Test the application
A size match alone does not establish finished-product performance or compliance.
Choosing a size
Choose a question to read more.
What the four size ranges tell you
Use the bands to shortlist material, then compare the actual acceptance limits.
The Bedrock granule range is black recycled SBR. Its four nominal bands overlap, so neighbouring grades are not separated into entirely different particle sizes.
| Nominal grade | What changes in the label |
|---|---|
| 0.5–2 mm | The lowest lower and upper limits in this range |
| 1–3 mm | Overlaps both finer and coarser options |
| 2–4 mm | Shares its lower limit with 2–5 mm |
| 2–5 mm | Extends to the largest nominal upper limit |
This tells you which grades to discuss. It does not tell you how much material sits near either end, how much is outside the band, or whether your formulation will accept it. Those are separate questions.
Why two 1–3 mm offers may differ
A nominal name does not show where the particle mass sits within the range.
Size distribution
One sample can contain more fine material and another more coarse material while both carry the same commercial label. Ask for the required percentages passing or retained on named sieves, not simply confirmation that the bag says 1–3 mm.
Other acceptance checks
Particle size does not measure residual steel, textile or other characteristics your process needs to control. EN 14243-2 addresses test methods for tyre-derived granules and powders, including size distribution and free steel/textile content. A reference to this standard is not a claim that Bedrock material has been tested to it.
Specify the method and requested evidence before ordering. Ask which measurements can be supplied for the proposed material; do not assume a generic product guide is a lot-specific test report.
Choose from your process backwards
The existing formulation or approved system is the best starting point.
For an established product
Start with the material specification you already use. Keep its size limits, contamination requirements and test method visible when comparing alternatives. A lower price for a differently specified grade is not a like-for-like comparison.
For a new product
Ask your formulator, binder supplier or system designer which particle range to evaluate. Test the candidate material in your actual process before selecting it for bulk supply. Do not infer binder dosage, drainage, impact protection or loading weight from particle size alone.
If your tender asks for 0.8–2.5 mm, for example, neither a 0.5–2 mm nor a 1–3 mm label proves a match. Share the buyer’s permitted sieve limits. The sieve-analysis guide explains how to read that requirement.
Have a target sieve specification?
Send Bedrock your sieve table, application, quantity and destination. We can discuss an available grade against your acceptance limits and what evidence or sample evaluation is needed before an order.
Send your granule specificationCommon questions
Is 1–3 mm the best all-purpose grade?
There is no universal best grade. Use the range required by your formulation, equipment or surface-system specification.
Does 2–5 mm cost less to use than a finer grade?
The grade label alone cannot establish total process cost. Compare the offered price with your tested formulation and agreed packing and loading details.
Can I compare grades using photographs?
Photos can show appearance, but they cannot replace a representative sample or measured particle-size distribution.