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Halogen-free, phosphorus-based flame retardant offering excellent fire safety performance.
Designed for high thermal stability and compatibility with polyamide 6 and polyamide 66 engineering plastics.
Enables UL 94 V-0 rating at low loading levels (typically 10–15 wt%) in reinforced and unreinforced nylons.
Maintains good mechanical properties—including tensile strength and impact resistance—after compounding.
Low smoke and low toxicity profile, supporting compliance with stringent environmental and safety standards (e.g., RoHS, REACH).
Electrical and electronic components requiring UL 94 V-0 certification, such as connectors and housings.
Automotive under-hood parts including sensor housings, fuse boxes, and ignition system components.
Industrial automation enclosures and control units exposed to elevated operating temperatures.
Consumer electronics casings where flame retardancy and material aesthetics must be balanced.
Power tools and appliance housings demanding reliable long-term thermal and fire performance.
| Chemical Type | Organophosphorus compound |
| Product Form | Free-flowing white granules |
| Appearance | White to off-white granular solid |
| Primary Applications | Polyamide 6 and polyamide 66 compounds |
| Key Features | Halogen-free, UL 94 V-0 capable, high thermal stability |
| Benefits | Retained mechanical properties, low smoke generation, RoHS/REACH compliant |
| Density (23 °C) | Approx. 1.7 g/cm³ |
| Decomposition Onset Temperature | ≥ 320 °C (TGA, 10 °C/min, N₂) |
Q1: What is the primary chemical nature and mode of action of Exolit OP935?
A: Exolit OP935 is a highly efficient, phosphorus-based flame retardant formulated as a reactive oligomer. It functions primarily in the condensed phase by promoting char formation and reducing flammable volatiles during thermal decomposition, thereby enhancing the inherent fire resistance of polymer matrices.
Q2: In which polymer systems is Exolit OP935 most commonly used?
A: Exolit OP935 is especially suited for engineering thermoplastics such as polyamide 6 and polyamide 66, where it delivers excellent flame retardancy without significantly compromising mechanical properties or processability. It is also compatible with certain polyesters and thermoplastic elastomers in halogen-free flame-retardant compound formulations.
Q3: How does Exolit OP935 compare to traditional halogenated flame retardants in terms of environmental and regulatory profile?
A: As a halogen-free solution, Exolit OP935 avoids concerns associated with persistent organic pollutants, corrosive smoke generation, and regulatory restrictions on brominated and chlorinated compounds. It supports compliance with global sustainability initiatives and meets evolving requirements for safer, more environmentally responsible additives.
Q4: What is the typical dosage range required to achieve V-0 rating in polyamide applications?
A: Exolit OP935 is typically used at low concentrations—generally ranging from 0.1% to 2% by weight—depending on the base polymer grade, desired flame performance level (e.g., UL 94 V-0), and presence of synergists or fillers. Optimal dosage must be determined empirically through formulation testing under end-use conditions.
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