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Phosphinate flame retardant system for polyester injection molding applications

Exolit® OP 1260

Flame Retardant for Polyester Exolit OP 1260 is a non-halogenated flame retardant based on organic phosphinates. The product achieves its flame retardant effect through a combined gas phase and condensed phase mode of action. Exolit OP 1260 is based on commercially available chemical substances registered in inventories worldwide.

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
  • Developed especially for use in glass fibre reinforced PBT
  • The flame retarded polyester compounds exhibit very good physical and excellent electrical properties
  • Good recyclability
  • Non-halogenated flame retardant with favorable environmental and health profile
Further safety data and handling information are available from our current 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 
white powder

Phosphorus  %(w/w)   19.8 - 20.8  

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

Karl-Fischer titration, e.g DIN 51777, part 1; (11/21)  
Density  g/cm³   approx. 1.41  

at 23 °C  
Bulk Density  g/cm³   400 - 600  

Decomposition Temperature  °C   min. 320  

DTA/TG, 2% weight loss, air  
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 1260 was developed especially for use in polyester. It is especially suited for both glass-fiber reinforced and non-reinforced PBT. The flame retarded polyester compounds exhibit very good physical and electrical properties.

In glass-fiber reinforced polyester, a dosage of about 18-20 % (by wt.) of Exolit OP 1260 is usually sufficient to obtain the UL 94 V-0 classification for electrical components (at 1.6 mm as well as 0.8 mm and 0.4 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 1260, it is important to pre-dry the polyester as usual. If possible, the resulting moisture content should be below 0.1 % (by wt.). Pre-drying of Exolit OP 1260 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 1260. 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.

This information is based on our present state of knowledge and is intended to provide general notes on our products and their uses. It should not therefore be construed as guaranteeing specific properties of the products described or their suitability for a particular application. Any existing industrial property rights must be observed. The quality of our products is guaranteed under our General Conditions of Sale.
Packaging and Handling
Delivery form
White powder

Exolit OP 1260 is delivered in 20 kg paper bags box with PE inliner or 500 kg big bags.

The product should be stored in a dry place at room temperature. Opened containers should be tightly resealed after use.
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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