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Exolit RP 614

Exolit RP 614 presscake (TP)

Phosphorus Red

Chem. Group:  Phosphorus Red  Supply Form:   CAS-No.:  7723-14-0  
Product-No.:  241572  Chemical Formula:     
Product Description 

Red phosphorus, stabilised and microencapsulated, wet filtered

Exolit RP 614 Presscake is a fine brown-red aqueous paste based on a highly stabilised, micro-encapsulated grade of red
phosphorus. The paste allows a safe and simple handling of the red phosphorus in a presscake form, and avoids the hazards associated when working with dry red phosphorus powders Exolit RP 614 Presscake is noted for its high oxidation and thermal stability. It is insoluble in water and organic solvents. Due to the combination of stabilisation and micro-encapsulation, the material is mostly inert against atmospheric influences. 

Delivery Specification and Technical Data 

Characteristics Unit  Target Value  DS¹) TD²)  Test Method 

Chemical Formula Px  -  
Phosphorus %(w/w)  > 90  
White Phosphorus %(w/w)  <0.002  
NMR-spectroscopic determination after extraction with CS2  
Water / Moisture %(w/w)  13 - 17  
pH Value  6 - 9  
Particle Size Distribution %(w/w)  
Wet sieving using acetone according DIN 53 195  
>400 µm  < 0.1  
> 150 µm  < 1.0  

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


Exolit RP 614 Presscake can be used to flame retard both synthetic and natural rubber latex systems. Due to its high
phosphorus content the product is a very effective flame retardant for a wide variety of water-based polymers either
alone or in combination with aluminium trihydrate or other synergists. Since red phosphorus tends to emit small amounts of the toxic gas phosphine (PH3) – even if it is very well stabilised – we advise against using Exolit RP 614 Presscake for large area indoor applications like flame retarding mattresses or carpets. The inherent red-brown colour of Exolit RP 614 Presscake is transferred to any product to which the flame retardant is added.

Safety and Handling

For regulatory details such as the classification and labeling as dangerous substances or goods please refer to our corresponding material safety data sheet. Additional information is available in the special leaflet Safety Precautions in Handling Red Phosphorus Powder Grades.


Exolit RP 614 Presscake containers must be closed tightly whenever any of the content is removed.
Although the desensitising process greatly reduces the sensitivity of red phosphorus to impact and friction as does the residual water, all handling operations must be carried out with due care, using only tools made from soft material (plastic,
wood etc.) If fire breaks out, the most suitable extinguishing agents are water spray, foam, wet sand and fire blankets. Fire extinguishers that operate under gas pressure are not suitable because they tend to whip up the red phosphorus powder and thus cause the fire to spread. Areas where fires involving red phosphorus powder have been extinguished should be doused several times with 2% potassium permanganate or with 10% soda or copper sulphate solution to render harmless the toxic and spontaneously flammable yellow phosphorus formed during the fire. Any mechanical movement of Exolit RP 614 Presscake as well as all operations in which Exolit RP 614 Presscake is exposed to intense heat, pressure etc. should be carried out in an inert gas atmosphere (nitrogen, argon).