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RP-AD
Yinsu
RP-AD
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I. Product Introduction
RP-AD is a synergistic flame retardant formulated through a special process that combines microencapsulated red phosphorus flame retardant with a highly effective halogen-free phosphorus-based flame retardant. It is specifically designed for expanded board systems. The red phosphorus component in the product undergoes a microencapsulation process, which effectively overcomes the drawbacks of red phosphorus—namely, its flammability and tendency to absorb moisture—while significantly improving its dispersion and thermal stability in PU systems.
Utilizing a phosphorus-phosphorus synergistic flame-retardant mechanism, this product offers high flame-retardant efficiency with low addition levels and minimal impact on the foaming process and the physical properties of the panels, making it an ideal flame-retardant solution for halogen-free, environmentally friendly PU foam panels.
II. Product Technical Data Sheet
Parameter | Specification |
Appearance | Dark purplish‑red to reddish‑brown powder |
Effective phosphorus content (w/w) | ≥22% |
Moisture (w/w) | ≤0.5% |
Particle size (D50) | ≤10 μm |
Autoignition temperature | ≥300°C |
Decomposition temperature (1%, TGA) | ≥280°C |
Bulk density | 0.6–0.9 g/cm³ |
III. Product Features
· High efficiency at low addition – Significant phosphorus phosphorus synergy enables PU foam boards to meet GB 8624 B1 or UL 94 V 0 rating at low loadings.
· Stable foaming process – Little interference with the reaction system of PU foam; does not affect cream time or rise time, resulting in uniform and fine cell structure.
· Minimal impact on mechanical properties – Maintains good compressive strength, no brittleness or powdering, and excellent dimensional stability.
· Halogen free and environmentally friendly – Free of halogens, compliant with RoHS, REACH and other international environmental regulations; low smoke and low toxicity during combustion.
· Excellent dispersibility – The microencapsulated red phosphorus disperses uniformly in PU systems without agglomeration or sedimentation.
· Good processing stability – High thermal stability; no blooming, no migration, and no corrosion of moulds during processing.
V. Applications
· Suitable substrates: Rigid polyurethane foam boards (PU insulation boards, PU construction panels, etc.).
· Recommended addition level: 8%–15% by weight of the polyol component, depending on the target fire rating (B1 or V 0), foam density, and formulation. Final dosage should be determined through trials.
· Mixing method: Pre mix RP-AD with the polyol component thoroughly (high speed stirring for 5–10 minutes is recommended), then proceed with the standard foaming process by adding isocyanate, catalysts, blowing agents, etc.
· Combination suggestions: Can be used together with liquid phosphorus based flame retardants (e.g., DMMP) to further improve efficiency.
· Colour note: As the product contains red phosphorus, finished boards will exhibit a light reddish to brownish tone. It is not recommended for applications requiring pure white or light colours.
VI. Package Storage & Transportation
1. Paper bag with inner PE bag, 25kg/bag.
2. Under normal conditions it is physically and chemically stable and non-volatile.
3. Avoid inhalation, swallowing or contact with skin and eyes.
4. Store in a cool and ventilated place.
