Red-phosphorus flame control additives
We use red-phosphorus for flame control additives. Although red-phosphorus belongs to Type II Hazardous Materials (combustible solid objects), it changes into a combustible material when mixed with resin. The reason for this is as follows.
When a flame is placed closed to red-phosphorus powder mixed with resin and molded,
1. Resin and red-phosphorus on the surface catch fire.
2. Then, the resin is combined with oxygen in the surrounding air and produces CO2, H2O (water vapor) and carbon.
CmHn + O2 → CO2 + H2O + C
3. Red-phosphorus is combined with oxygen in the surrounding air and turns into an oxide. The oxide is further combined with H2O (water vapor) and produces condensed phosphoric acid (polymer phosphoric acid).
4. The mixture of carbon on the surface of the resin and condensed phosphoric acid forms a thin layer, which prevents oxygen from penetrating inside, and the resin turns incombustible. So, the fire on the surface of the resin goes out when the flame is moved away.
*It is surprising that a combustible red-phosphorus makes resin incombustible. Compared with other incombustible elements such as halogen, phosphorus ranks higher for incombustibility when mixed with resin. Over 90% of red-phosphorus flame control additive, is phosphorus so red-phosphorus flame retardant is highly effective.
How to use red-phosphorus flame retardant
Red-phosphorus is categorized as a Type II Hazardous Material (Flammable solid). We manufacture master batches of red-phosphorus in order to use it safely. Master batches are produced on order. It is sometimes impossible to take an order at the busiest times (beginning and end of the month). Please contact us before ordering.
Products : Flame retardant
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Contact us : rinka@rinka.co.jp
