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Exolit RP 6500

Exolit RP 6500

Phosphorus Red

Chem. Group:  Phosphorus Red  Supply Form:   CAS-No.:   
Product-No.:  195990  Chemical Formula:     
Product Description 

Exolit RP 6500 is a brown-red paste, and is a blend of stabilised, micro encapsulated red phosphorus in an epoxy resin carrier.The paste form allows safe and simple handling of the red phosphorus in a liquid form, and avoids the hazards associated when working with red phosphorus powders. The thixotropic nature of this concentrate hinders the sedimentation process and simplifies the re-homogenisation after long storage periods. 

Delivery Specification and Technical Data 

Characteristics Unit  Target Value  DS¹) TD²)  Test Method 

Phosphorus %(w/w)  43.0 - 47.0  
Beckopox EP 140 Content %(w/w)  52.0 - 57.0  
Epoxy Group Content mol / 100g  approx. 0.27  
Density g/cm³  1.42 - 1.62  
at 25 °C  
Viscosity Pa*s  max. 600  
at 25 °C  

¹) The product is constantly monitored to ensure that it adheres to the specified values.
²) The technical data are used solely to describe the product and are not subject to constant monitoring  


Exolit RP 6500 has been developed as flame retardant for epoxy resins for electrical applications. Due to its high phosphorus content the product is a very effective flame retardant. Exolit RP 6500 can be used to make halogen-free flame retarded epoxy resin laminates by impregnation of glass cloth (gram weight 200 g/cm²) with epoxy resin solutions. Using about 12 phr of Exolit RP 6500 can lead to a V-0 classification. These laminates can be used for printed circuit boards or for epoxy moulding/ potting compounds. 
Red Phosphorus and aluminium hydroxide have a synergistic flame retardancy effect. When combining Exolit RP 6500 with aluminium hydroxide a UL 94 classification of epoxy casting resins can be achieved with low amounts of fillers.