Top-Performing PU Binders

Top-Performing PU Binders

Summary

At FieldsMaster, we specialize in manufacturing high-quality EPDM granules and advanced PU binders for sports flooring applications.

Top-Performing PU Binders
At FieldsMaster, we specialize in manufacturing high-quality EPDM granules and advanced PU binders for sports flooring applications. Our products are trusted by contractors, architects, and facility managers worldwide, ensuring durable, safe, and aesthetically pleasing surfaces for playgrounds, running tracks, and sports fields.
In this blog, we’ll dive into our two flagship PU binders, explain how to adjust their hardness, and discuss key certifications that ensure safety and performance.
PU Binder suppliers

Our Top-Performing PU Binders

FM-PU 1185 Binder

FM-PU 1185 Aliphatic Binder – 

Non-Yellowing First choice for bright colored epdm granules


Key Features: Maintains clarity and brightness in high-temperature climates Enhanced flexibility and weather resistance 

Best For: Outdoor sports surfaces (playgrounds, running tracks) High-end projects requiring long-term color stability

FM-PU 8004 Binder

FM-PU 8004 
Aromatic Binder / MDI Binder


Key Features:
Strong adhesion for EPDM granules Cost-effective solution for standard applications Excellent mechanical strength and durability


How to Adjust the Hardness of PU Binder?

1. NCO (Isocyanate) Content

Higher NCO content → Harder material (more cross-linking, denser structure).

Lower NCO content → Softer material (longer polymer chains, more flexible). 

Note: Too low NCO may reduce bond strength, so balance is key.


2. Polyol Selection & Molecular Weight

High-molecular-weight polyols → Softer, more elastic PU.
Low-molecular-weight polyols → Harder, more rigid PU.


3. Curing Conditions

Higher temperature curing → Faster reaction, harder result. 

Lower temperature curing → Slower reaction, softer result.


4. Plasticizers (For Softening)

Adding plasticizers increases flexibility but may reduce bond strength if overused.


Takeaway:Softer PU = Lower NCO, higher polyol MW, plasticizers.
Harder PU = Higher NCO, lower polyol MW, controlled curing.
binder for rubber granules
pu binder for epdm

Essential Certifications for PU Binders

To ensure safety, environmental compliance, and performance, our PU binders meet: 

✅ PAHs (Polycyclic Aromatic Hydrocarbons) Free – Safe for children’s playgrounds. 

✅ Low VOCs (Volatile Organic Compounds) – Eco-friendly, minimal odor. 

✅ REACH & RoHS Compliant – Free from hazardous substances. 

✅ EN71-3 Certified – Safe for toys and children’s areas. 

These certifications guarantee that our binders are non-toxic, durable, and suitable for global markets.

fieldsmaster honorary qualification

Why Choose FieldsMaster?

✔ 26+ Years of Expertise in EPDM & PU binder manufacturing. 

✔ Customizable Solutions – Adjust hardness, color, and performance. 

✔ Global Certifications – Safe for sports, schools, and public spaces. 

✔ Sustainable Production – Eco-friendly processes with minimal emissions.

EPDM granules factory
fieldsmaster office