#How to produce the high quality EPDM granules? Producing high-quality EPDM granules requires control from raw material selection all the way to final packaging.

 

#epdm granules manufacturer #epdm granules factory #epdm granules workshop #epdm granules supplier #How to produce the high quality EPDM granules? Producing high-quality EPDM granules requires control from raw material selection all the way to final packaging. Below is a practical, industry-level process used by professional EPDM granule manufacturers for wet pour playgrounds, tracks, and sports flooring. www.Jiadongworld.com

1. Raw Material Selection (Most Critical)

High quality EPDM starts with true EPDM rubber, not recycled SBR.

Key requirements

EPDM polymer content ≥ 20–25%

Low saturation, UV-resistant grade

No reclaimed rubber, no fillers like CaCO₃

Non-toxic, REACH & EN71 compliant

Why it matters

Color stability (no fading)

Elasticity and rebound

Long outdoor lifespan (8–10+ years)

2. Precise Color Compounding

Pigments determine color fastness and consistency.

Best practices

Use inorganic UV-stable pigments

High-shear internal mixing for uniform dispersion

Accurate formulation control (±0.5%)

Result

Bright, consistent colors

No white spots, no color separation

Excellent weather resistance

3. Professional Rubber Mixing

Rubber, pigments, oil, and additives are mixed in:

Internal mixer (Banbury type)

Temperature strictly controlled (avoid scorch)

Even dispersion of all components

Poor mixing = weak granules, uneven color, short life.

4. Sheet Extrusion & Vulcanization

This step defines mechanical performance.

Process

Rubber compound extruded into sheets

Continuous vulcanization (hot air / microwave / press)

Cross-link density strictly controlled

Key outcomes

High tensile strength

Stable elasticity

No surface oil migration

5. Cryogenic or Mechanical Granulation

Sheets are cut into granules.

High-end methods

Cryogenic grinding (liquid nitrogen)

Low-temperature mechanical crushing

Why this matters

Clean, sharp granules

Minimal dust

No thermal degradation

6. Accurate Sieving & Dust Removal

Granules are classified by size:

Common sizes:

0.5–1.5 mm

1–3 mm

2–4 mm

Custom sizes available

Dust removal is essential to:

Improve PU binder bonding

Reduce installation problems

7. Strict Quality Control Testing

Each batch should be tested for:

Test Item Standard

EPDM content ≥20%

Color fastness Grade 4–5

Tensile strength ≥7 MPa

Elongation ≥500%

UV aging No cracking

Heavy metals EN71 compliant

8. Clean Packaging & Storage

Moisture-proof woven bags (25 kg)

Anti-UV indoor storage

FIFO batch control

Proper storage prevents:

Color contamination

Moisture absorption

Binder reaction issues