TPU flame retardants

Polyester TPU Retardant BR-S13

BR-S13 is a novel flame retardant, specially developed for thermoplastic polyurethane in different applications, such as TPU film, circuit, and glue. It can be used individually to maintain the transparency of TPU product. When used in combination with MCA, significant FR synergistic effect was shown.

1. Materials

Polyester TPU: BASF S90A
Flame Retardants: Inovia BR-S13, BASF MC25

2. Processing

Drying: ionic liquid: 85℃, 4hrs; TPU pallet:100℃, 4hrs
When using BR-S13 individually, please use liquid feeding pump
Extrusion temperature: 195~215℃
Injection temperature: 205~210℃; mold temperature: 60℃

3. Application Example Data

Table 1 Flame Retarding Performance

	BR-S13	MCA	UL 94 rating
Transparent FR-TPU	1.3%	/	V0@1.6mm
Translucent FR-TPU	1%	2%	V0@1.6mm

Table 2 Physical Properties

	Unit	TPU	Transparent FR-TPU	Translucent FR-TPU
Tensile strength	MPa	32.3	25.3	26.2
Stress at 100% strain	MPa	10.5	9.1	9.3
Stress at 300% strain	MPa	19.2	14.4	14.7
Elongation	%	620	729	752

Note: The test standard is ASTM D 412, speed: 500mm/min.

Table 3 Processing Flowability

MI	Unit	TPU	Transparent FR-TPU	Translucent FR-TPU
200℃, 2.16kg	cm³/min	6.6	21.2	18.7

4. Summary

BR-S13 can significantly enhance the MI of TPU. When the MI of the base TPU material is inherently high, the resulting FR TPU tends to exhibit lower tensile strength. Therefore, it is recommended to select a TPU with the same hardness but a lower MI. This approach ensures that both the absolute value and the relative retention rate of tensile properties in the final FR TPU product are optimized.

Note: The addition of antioxidants may contribute to improved color stability.

Product TDS and SDS Files：

TPU Retardant BR-S13_TDS Download

TPU Retardant BR-S13-SDS-US Download