Exolit® AP 740
Intumescent system based on APP for light weight composite and gel-coat applications
- Edition Date :
- July 25, 2013
- Non-halogenated additive flame retardant system based on ammonium polyphosphate which develops its effectiveness through phosphorus/nitrogen synergism and intumescence
- May be used in a range of thermoset resins, especially unsaturated polyester resin, acrylic resins, epoxy or phenolics
- Suitable both for coatings and reinforced materials
- Low smoke density
- In polyester gel coats, important standards like DIN EN 13501-1 or DIN 5510 S4 SR2 ST2 can be passed
- Can be used alone or in combination with synergists like aluminium hydroxide in composites
- Very effective in methacrylate-styrene dissolved polyester resins
- Non-halogenated flame retardant with favorable environmental and health profile
Safety and MSDSFor regulatory details such as the classification and labelling as dangerous substances or goods please refer to our corresponding Material Safety Data Sheet.
Please contact us for safety and regulatory details or the Material Safety Data Sheet (MSDS).
Characteristics Unit Target value DS¹) TD²) Test method Phosphorus % (w/w) 18.0 - 20.0
Photometry after oxidizing dissolution; (11/17) Nitrogen % (w/w) 21.0 - 23.0
Elemental analysis; (11/07) Density g/cm³ approx. 1.8
At 25 °C Bulk Density g/cm³ approx. 0.6
Solubility in Water % (w/w) < 3
At 20 °C in 10 % suspension Decomposition Temperature °C > 200
Initial evolution of ammonia Average Particle Size (D50) µm approx. 16
Particle Size Distribution % (w/w)
Air jet sieving; (11/02) > 100 µm max. 2.0 - - - 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 740 may be used in a range of thermoset resins, especially unsaturated polyester resin, acrylic resins, epoxy or phenolics. It is suitable both for coatings and reinforced materials. In addition to primary effects of fire such as spread of flames and residual length, secondary effects such as smoke density and formation of toxic smoke is of interest.
Using Exolit AP 740 a low smoke density is achieved. By the addition of Exolit AP 740 in polyester gel coats important standards like DIN EN 13501-1 or DIN 5510 S4 SR2 ST2 can be passed. In composites Exolit AP 740 can be used alone or in combination with synergists like aluminium hydroxide.
Formulations and achievable flame retardant effect
Exolit AP 740 is very effective in methacrylate-styrene dissolved polyester resins.
UL 94 V-0 (1.6 mm): > 30 phr* Exolit AP 740
DIN 5510 S4 SR2 ST2: > 30 phr* Exolit AP 740
NF 92-501 class M1: > 50 phr* Exolit AP 740
DIN EN 13501-1: > 75 phr* Exolit AP 740
ABD 0031 Airbus Industries requirements for interior parts: Passed with 50 phr
In styrenic polyester resins Exolit AP 740 can be combined with aluminium hydroxide to reduce the overall filler content
necessary to pass different flammability standards. In these systems, Exolit AP 740 is normally added at 15 – 25 parts and
aluminium hydroxide at 50 – 150 parts per hundred resin.
*phr= parts per hundred resin
Packaging and HandlingDelivery form
White free flowing powder
Exolit AP 740 is supplied in 20 kg net bags. The standard supply unit is a 1.000 kg shrink-wrapped pallet.
Minimum shelf life is 12 months from the date of shipping when stored according to the said conditions.