Table 1.

Selected test results of water immersion-freeze-thaw cycling accelerated weathering.

Matrix/NF	NF, ratio	Number of cycles	Flexural properties loss, %		Reference
			Strength	Modulus
PVC/maple	100 phr	5	15	34	[22]
PVC/maple	100 phr	5 (f–t)	NS	NS
PVC/pine	100 phr	5	13	30
PVC/pine	100 phr	5 (f–t)	˜+3	˜+7
HDPE/maple	50%	15	21	50	[23]
HDPE/pine	50%		5	38
HDPE/rice husk	65%	12	38	67	[24]
	65% + CA		5	23
HDPE/pine	40%	5	NS	18; 261	[25]
	40% + CA		NS	5
PE/rice husk		6	39	55	[26]
HDPEv/pine	40%	12	5	0	[17]
HDPEv/pine	50%		30	16
HDPEr/pine	50%		9	43
HDPEr/pine	50% + CA		9	67
PPv/pine	50%		31	19
PPr/pine	50%		24	39
PPr/pine	50% + CA		18	61
PP/cellulose	30%	3	48	85	[27]
PP/peat	50%		9–242	26–57

NF - natural fibres; f–t - only freeze-thaw actions; NS - non-significant; v - virgin; r - recycled; CA - coupling agent.

¹Depending on HDPE type.

²Depending on the peat composition.