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High thermal stability suitable for processing temperatures up to 300 °C.
Low volatility and minimal migration in polymer matrices during long-term service life.
Excellent compatibility with polycarbonate (PC), PC/ABS blends, and polyesters.
Halogen-free formulation meeting stringent environmental and regulatory requirements (e.g., RoHS, REACH).
Efficient gas-phase flame inhibition mechanism with low loading levels (typically 8–12 wt%).
Flame-retarded polycarbonate for electronic enclosures and housing components.
PC/ABS blends used in automotive interior parts requiring UL94 V-0 rating.
Engineering thermoplastics for IT and telecommunications equipment housings.
LED lighting fixtures and optical components demanding clarity and fire safety.
Consumer electronics casings where low smoke density and non-corrosive decomposition are critical.
| Chemical Type | Organophosphorus compound (Bisphenol A bis(diphenyl phosphate)) |
| Product Form | White to off-white granular solid |
| Appearance | Free-flowing granules, no visible impurities |
| Molecular Weight (approx.) | 990 g/mol |
| Phosphorus Content | 5.6–5.9 wt% |
| Decomposition Onset Temperature | ≥290 °C (by TGA, 10 °C/min, N₂) |
| Moisture Content | ≤0.1 wt% |
| Density | 1.28–1.32 g/cm³ |
Q1: What is the primary chemical nature of CR-741 and how does it function as a flame retardant?
A: CR-741 is a bromine-free, organophosphorus-based flame retardant derived from bisphenol-A diphenyl phosphate (BDP). It acts primarily in the condensed phase by promoting char formation on the polymer surface during thermal decomposition, thereby reducing fuel release and slowing flame propagation.
Q2: Which polymer systems is CR-741 most commonly used in?
A: CR-741 is widely compatible with engineering thermoplastics—particularly polycarbonate (PC), PC/ABS blends, and polyesters—where it delivers balanced flame retardancy without significantly compromising mechanical properties or melt processability.
Q3: Does CR-741 affect the optical clarity or color stability of transparent PC formulations?
A: When properly dispersed and processed under controlled thermal conditions, CR-741 maintains good compatibility with polycarbonate and generally supports high transparency and minimal yellowing—making it suitable for applications requiring aesthetic integrity, such as lighting housings and electronic enclosures.
Q4: How should CR-741 be incorporated into a polymer matrix?
A: CR-741 is typically added via dry blending prior to extrusion or injection molding. It exhibits good thermal stability up to standard processing temperatures for PC and PC/ABS, and is generally used at low concentrations—dosage depends on formulation requirements and target flame performance (e.g., UL94 V-0).
Q5: Is CR-741 compatible with common additives such as impact modifiers, UV stabilizers, or processing aids?
A: Yes, CR-741 demonstrates broad compatibility with standard polymer additives used in engineering thermoplastics. However, synergistic or antagonistic interactions may occur depending on specific additive chemistries, so formulation-level compatibility testing is recommended for critical applications.
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