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Phosphinate flame retardant system for reinforced polyamide 6 and polyamide 66

Exolit® OP 1312

Exolit OP 1312 is a non-halogenated flame retardant based on organic phosphinates. The product achieves its flame retardant effect through intumescence. The thermoplastic polymer with Exolit OP 1312 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-insulating effect, reduces oxygen access and prevents dripping of molten polymer. Exolit OP 1312 is a white powder.

For more details see our Innovation Spotlight video.

  • Achieves its flame retardant effect through a combined gas phase and condensed phase mode of action
  • UL 94 V-0 rating down to 0.4 mm thickness
  • Good colorability
  • Suited for both glass-fibre-reinforced and unreinforced grades
  • The flame retarded polyamide compounds exhibit very good physical and excellent electrical properties
  • Most efficient grade regarding UL 94 and glow wire ignition temperature (GWIT) test performance
  • Low smoke toxicity
  • Good contrast in laser marking
  • Low material density
  • Non-halogenated flame retardants with favorable environmental and health profile
For regulatory details such as the classification and labelling as dangerous substances or goods please refer to our corresponding Material Safety Data Sheet. For disposal in accordance with the regulations the product should be treated as special waste and taken to a suitable incineration plant.
Characteristics Unit Target Value DS¹) TD²) Test Method 
Phosphorus  %(w/w)   18.7 - 19.7  

Photometry after oxidizing dissolution; (11/17) or wavelength dispersive X-ray fluorescence spectrometry; (11/23)  
Water / Moisture  %(by wt.)   max. 0.3  

Karl-Fischer titration; (11/21)  
Density  g/cm³   approx. 1.6  

at 20°C  
Bulk Density  g/L   approx. 500  

Decomposition Temperature  °C   > 320  

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 OP 1312 was developed especially for use in polyamides. It is suited for both glass-fibre-reinforced and unreinforced grades. The flame retarded polyamide compounds exhibit very good physical and electrical properties. Exolit OP 1312 is also used in TPU for cable extrusion but also various injection moulded parts and artificial leather.

In glass-fibre-reinforced polyamide 6 or 6.6, a dosage of 15 to 20 % (by wt.) Exolit OP 1312 is usually sufficient to obtain the UL 94 V-0 classification for electrical components (at 1.6 as well as 0.8 mm thickness). Subject to the polymer grade, processing conditions and glass- fibre reinforcement the dosage of the flame retardant may vary.
Before incorporating Exolit OP 1312, it is important to predry the polyamide as usual. If possible, the resulting moisture content should be below 0.1 % (by wt.). Predrying of Exolit OP 1312 is not necessary. However, predrying (e.g. 4 h at 120 °C) is recommended, if even very low moisture contents must be avoided.

The mixing and processing methods customary in powder processing of polymers can be used with Exolit OP 1312. The VDI Guideline 2263 “Prevention of dust fires and dust explosions” or the relevant national regulations must be observed.

The optimum conditions for incorporating should be determined in each individual case. Care must be taken to ensure homogeneous dispersion of all components. The temperature of the polymer melt should not exceed 320 °C.
Packaging and Handling
Delivery form
White powder

Exolit OP 1312 is delivered in 20 kg paper bags with PE inliner or 500 kg big bags.


The product should be stored in a dry place at room temperature.

Minimum shelf life is 12 months from the date of shipping when stored according to the said conditions.
More Information
For more details see our Innovation Spotlight video.

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