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Intumescent system based on APP, especially for polyolefin reinforced and extrusion application

Exolit® AP 766

Exolit AP 766 is a non-halogenated flame retardant based on phosphorus and nitrogen synergism. The product achieves its flame retardant effect through intumescence. The thermoplastic material foams and crosslinks on exposure to flame and forms a stable char at the surface acting as a barrier. The protective layer provides a heat-insulation effect, reduces oxygen access and prevents dripping of molten polymer.

  • Non-halogenated flame retardant based on phosphorus and nitrogen synergism, achieving its flame retardant effect through intumescence
  • Non-halogenated flame retardant with favorable environmental and health profile
  • Suited for PP, PE, PP copolymers and PP blends for injection molding applications as well as for glass-fiber-reinforced grades
  • Shows efficiency in certain olefinic and styrenic elastomers
  • Low smoke density and low smoke gas corrosivity
  • Good electrical and mechanical properties
  • Excellent UV stability
  • Good recyclability
For regulatory details such as the classification and labeling as dangerous substances or goods please refer to our corresponding Material Safety Data Sheet.
Characteristics  Unit   Target Value   DS¹) TD²) Test Method 
Appearance   White powder

Visual evaluation
Phosphorus  % (w/w)   23.0 - 25.0  

Photometry after oxidizing dissolution; (11/17)  
Water / Moisture  % (w/w)   max. 0.5  

Karl-Fischer titration; (11/21)  
Nitrogen   % (w/w)   14.4 - 16.4  

Elemental analysis; (11/07)  
Density  g/cm³   approx. 1.6  

At 20 °C  
Bulk Density g/cm³ approx. 0.6

Decomposition Temperature  °C   > 240

¹) Delivery specification: The product is monitored on a regular basis to ensure that it adheres to the specified values. Test methods: Clariant method numbers 11/xx in brackets.
²) Technical data: The technical data are used solely to describe the product and are not subject to regular monitoring.  
Exolit AP 766 was developed especially for use in polyolefins. It is suited for PP, PE, PP copolymers and PP blends for injection molding and extrusion applications as well as for glass-fibre-reinforced grades.

In PP homopolymer and glass-fiber-reinforced PP, a dosage of 20 to 22 % (by wt.) Exolit AP 766 is usually sufficient to obtain the UL 94 V-0 classification at 1.6 mm together with GWFI 960°C and GWIT 800°C.
The mechanical properties of plastics are slightly altered by addition of Exolit AP 766 due to the filler like type of the flame retardant.
Subject to the polymer grade, processing conditions and glass-fibre-reinforcement the dosage of the flame retardant may vary.
The optimum conditions for incorporating should be determined in each individual case. Care must be taken to ensure homogeneous dispersion of all components. Both single- and twin-screw extruders are suitable for incorporating the product. The temperature of the polymer melt should not exceed 250°C.

To prevent degradation effects by high shear energy, it has proved an advantage to use machines of less shear-intensive design. When a water bath is used for cooling the strands, it is advisable to keep the passage through the water bath as short as possible to permit optimum evaporation of any entrained water. In some cases, depending on production conditions, it may be necessary to dry the granules obtained.

The mixing and processing methods customary in powder processing of polymers can be used with Exolit AP 766 .

The VDI Guideline 2263 “Prevention of dust fires and dust explosions” or the relevant national regulations must be observed.
Packaging and Handling
Delivery form
White powder 

Exolit AP 766 is delivered in 20 kg bags / 1.000 kg shrink-wrapped pallet.

Exolit AP 766 is non-hygroscopic. However, when stored in open container, the product can still absorb small amounts of moisture owing to the high surface area of the powder. Plastic granules containing Exolit AP 766 also absorb small amounts of water after processing, depending on storage conditions. It is therefore advisable to store plastic granules containing Exolit AP 766 in sealed containers at room temperature in a dry place. Partially emptied containers should be carefully resealed after use.

Minimum shelf life is 12 months from the date of shipping when stored according to the said conditions. 

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