Flame Retardants

RP-EP Epoxy-Based Red Phosphorus Flame Retardant Paste

RP-EP is a microencapsulated red phosphorus flame retardant paste dispersed in an epoxy resin carrier. It provides high flame-retardant efficiency with safe, non-dusting handling and excellent storage stability. RP-EP delivers strong char formation, reliable dispersion and high compatibility with epoxy and polyurethane systems. Its thixotropic behaviour prevents settling, simplifies processing and ensures consistent performance in electrical insulation, EV components, adhesives, sealants and high-performance composites.

Attributes

Key Features and Benefits

• High phosphorus loading (43–47 percent) enables strong, halogen-free flame retardancy.
• Epoxy carrier system improves compatibility with epoxy and PU matrices.
• Paste form eliminates dust hazards, improving operator safety.
• Thixotropic stability prevents sedimentation during storage.
• Excellent dispersibility ensures uniform flame-retardant distribution.
• Halogen-free formulation compliant with RoHS, REACH and SGS.
• Low phosphine evolution reduces processing risks.
• Can be warmed to 50–80 °C for improved flowability.
• Suitable for electrical, structural, and thermal-management applications.

Specifications

Technical Highlights

• Product type: Epoxy-based red phosphorus paste
• Appearance: Brownish-red thixotropic paste
• Phosphorus content: 43–47 percent
• Density: 1.40–1.63 g/cm³ (ASTM D792)
• Viscosity: ≤600 Pa·s (25 °C, Brookfield)
• Epoxy resin (EP140) content: 53–57 percent
• pH: 6–8 (ASTM E70)
• Flash point: >150 °C (ASTM D92)
• Recommended addition: 5–15 wt%, application-dependent

Download Technical Data Sheet (TDS)

Practical industry uses

Applications

• Electrical & Electronics: Connectors, housings, PCB coatings, switchgear insulation
• Electric Vehicles (EVs): Battery enclosures, insulation components, structural parts
• Energy & Power Systems: High-voltage insulation, cable sheathing, electrical encapsulation
• Adhesives & Sealants: Epoxy- and PU-based fire-resistant bonding and sealing systems
• Composites & Pultrusion: Structural laminates, molded composite parts requiring FR performance
• Foam Systems: PU and epoxy foams for gasketing, insulation and vibration damping
• Industrial Coatings: Intumescent and protective coatings for electrical or composite substrates