TCPP (Tris(1-Chloro-2-Propyl) Phosphate) | Flame Retardant Plasticizer — CAS 13674-84-5

TCPP (Tris(1-chloro-2-propyl) phosphate, CAS 13674-84-5) is a liquid halogenated phosphate ester that functions as both a reactive flame retardant and a secondary plasticizer. At ambient temperature it presents as a colorless to pale yellow transparent oil with a viscosity of 65–70 mPa·s at 25°C — low enough to blend cleanly into most polymer matrices without elevated processing temperatures or additional dispersing aids.

The dual flame-retardant mechanism is what makes TCPP commercially important. Phosphorus acts in the condensed phase, promoting char formation and interrupting polymer decomposition. Chlorine acts in the gas phase, scavenging free radicals in the flame front. With phosphorus at 9.0–9.8% and chlorine at 32.0–32.8%, STONEAF-TCPP achieves meaningful flame suppression with a relatively low loading level — reducing the risk of compromising mechanical or aesthetic properties in the finished part.

Tris(2-chloroisopropyl)phosphate (TCPP) is Mainly used in the flame-retardance of PVC, polystyrene, phenolic resins, acrylic resins, rubber and coating.

Density sits at 1.280–1.295 g/cm³, and the refractive index at 25°C reads 1.462–1.465. Purity is ≥98% by content, acid value is capped at ≤0.1 mgKOH/g, and moisture is controlled to ≤0.1%. These tight limits matter to formulators because acid contamination and residual moisture are the two most common sources of hydrolytic instability in phosphate ester systems — both accelerate polymer degradation and can cause discoloration or gas evolution during processing.

Beyond flame retardancy, TCPP contributes measurable secondary benefits: reduced brittleness at low temperatures, improved moisture barrier properties, and mild antistatic behavior. For flexible PVC or soft foam applications where the formulation must meet flame standards without sacrificing cold-weather performance, TCPP delivers both functions in a single additive — simplifying the formulation and reducing raw material SKU count.

Bastone manufactures STONEAF-TCPP at controlled production facilities in Hangzhou, with in-house quality verification against each specification parameter before release. Consistent batch-to-batch quality — particularly on chlorine content and acid value — is a frequent pain point when sourcing flame retardant plasticizers from trading companies that aggregate product from multiple toll manufacturers. Bastone's direct manufacturing eliminates that variability.