Study of the Addition of a Thermoplastic Vulcanizate to a HDPE Composite Highly Filled with Magnesium Hydroxide and Its Effect on the Tensile and Flame Retardant Properties

Table 5

Flame resistance of the studied composites, with varying TPO/TPV contents.

Composites	Flame resistance
	UL-94 HB (horizontal)	UL-94 V (vertical)
Pure HDPE	32.4^a	Fails, drips
Pure TPO	27.6	Fails, drips
Pure TPV	18.6	Fails, drips
TPO-10	AE^b	Fails, drips
TPO-20	AE	Fails, drips
TPO-30	AE	Fails, drips
TPO-40	AE	V-1
TPV-10^c	AE	Fails, drips
TPV-20	AE	V-1
TPV-30	AE	V-1
TPV-40	AE	V-1

^aBurning rate (mm/min); applicable to the first 3 pure polymers, which burned completely. ^bAutoextinguishable; 8 composites with TPO/TPV with 130 phr Mg(OH)₂ as in Table 3. ^cThis pure TPV and the TPV in all composites are a blend of EPDM/HDPE (60/40 wt%), crosslinked with 0.10 phr Luperox.