Exolit® AP 423
Exolit AP 423 is a very fine-particle ammonium polyphosphate produced by a special method. The crystal modification is phase II. The product is largely insoluble in water and completely insoluble in organic solvents. It is a white powder, halogen free and non-flammable.
Product Information
- Low solubility in water, low viscosity in aqueous suspensions and a low acid number
- Imparts a good flame-retardant effect to adhesives and sealants when incorporated into the base formulation at the rate of 10 - 20%
- Particularly suitable as an ”acid donor” for intumescent coatings thanks to its low water solubility. Steel structures coated with intumescent paints can meet the requirements of fire resistance classes specified in EN, DIN, BS, ASTM and others
- The application of Exolit® AP 423 based intumescent coatings on wood or plastics enables these materials to qualify for Building Material Class B (DIN EN 13501-1)
- Can be used in transport applications to obtain good fire, smoke and toxicity results (EN 45545)
- (Bio-)degradable by breaking down to naturally occurring phosphate and ammonia
- Non-halogenated flame retardant with favorable environmental and health profile
| Characteristics | Unit | Target value | DS¹) | TD²) | Test method |
| Chemical Formula | [NH4PO3]n n > 1000 |
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| Phosphorus | %(w/w) | 31.0 - 32.0 |
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Photometry after oxidizing dissolution; (11/17) |
| Water / Moisture | %(w/w) | max. 0.5 |
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Thermogravimetry at 130 °C; (11/03) |
| Nitrogen | %(w/w) | 14.0 - 15.0 |
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Elemental analysis; (11/07) |
| Density | g/cm³ | 1.9 |
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at 25 °C |
| Bulk Density | g/cm³ | approx. 0.7 |
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| Viscosity | mPa*s | max. 100 |
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at 25 °C in 10 % aqueous suspension |
| pH Value | 5.0 - 7.5 |
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Potentiometry in 10 % aqueous suspension; (11/12) | |
| Solubility in Water | %(w/w) | max. 1.0 |
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Gravimetry after filtration of a 10 % aqueous suspension at 25°C; (11/41) |
| Decomposition Temperature | °C | > 275 |
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initial evolution of ammonia |
| Average Particle Size (D50) | µm | approx. 8 |
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| Particle Size Distribution | %(w/w) |
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Air jet sieving; (11/02) |
| < 24 µm | min. 97 (TD) | ||||
| > 50 µm | max. 0.1 (DS) | ||||
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| 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. |
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On account of its low water solubility, Exolit AP 423 is particularly suitable as an ”acid donor” for intumescent coatings. Other essential components of intumescent systems include a binder, a carbon donor (e.g. pentaerythritol) and a blowing agent (e.g. melamine).
On exposure to flame, intumescent coatings form a carbonaceous foam which effectively shields the underlying material from temperature increases.
Steel structures coated with intumescent paints can meet the requirements of fire resistance classes specified in DIN, BS or ASTM.
The application of Exolit AP 423 based intumescent coatings on wood or plastics enables these materials to qualify for Building Material Class B (DIN EN 13501-1).
Exolit AP 423 imparts a good flame-retardant effect to adhesives and sealants when it is incorporated into the base formulation at the rate of 10 - 20 %.
Other applications
In composites for transport applications it can be used to control fire, smoke and toxicity. Especially in railway (EN 45545-2) and aviation (FAR 25.853) applications low smoke density and toxicity is a key requirement.
Due to the fine particles it can be used for infusion processing technics.
White powder
Packaging
Exolit AP 423 is packed in 25 kg bags. The standard supply unit is a shrink-wrapped pallet with 40 bags weighing 1000 kg net.
Storage
Minimum shelf life is 6 months from the date of shipping when stored according to the said conditions.
