Class 1 Resin (ASTM E84)
Maximum Fire Safety: Flame Spread Index ≤ 25
Certified Class A / Class 1 fire retardant resins for architectural and industrial applications.
What is Class 1 Resin?
Class 1 Resin (also referred to as Class A in some building codes) specifies a resin system that achieves a Flame Spread Index (FSI) of 25 or less when tested according to the ASTM E84 standard (Standard Test Method for Surface Burning Characteristics of Building Materials).
Achieving this rating is critical for interior wall and ceiling finishes in public buildings, transport hubs, and high-risk industrial environments. Changyuan provides specialized Class 1 fire retardant resins that meet these stringent requirements while maintaining excellent mechanical strength.
ASTM E84 Classification:
- Class A (Class 1): Flame Spread Index 0-25 (Highest Protection)
- Class B (Class 2): Flame Spread Index 26-75
- Class C (Class 3): Flame Spread Index 76-200
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Key Features of Our Class 1 Resins
High Fire Resistance
Formulated with advanced halogen or halogen-free retardants to stifle combustion immediately.
Fully Certified
Tested in accredited laboratories to ensure consistent ASTM E84 Class 1 compliance.
Low Smoke Options
Available in low smoke density formulations (ASTM E662) for tunnel and enclosed space safety.
ASTM E84 Test Data
Typical flammability characteristics for our Class 1 resin systems
| Property | Test Method | Class 1 Polyester | Class 1 Vinyl Ester |
|---|---|---|---|
| Flame Spread Index | ASTM E84 | 20 | 15 |
| Smoke Developed Index | ASTM E84 | < 450 | < 400 |
| Tunnel Test Class | Classification | Class A / Class 1 | Class A / Class 1 |
| Oxygen Index | ASTM D2863 | 30% | 34% |
Certification Library
Download compliance reports for project verification
Explore Our Fire Retardant Product Line
We offer a complete range of Class 1 orthophthalic, isophthalic, and vinyl ester resins.
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