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Technical performance index of smooth HDPE geomembrane (CJ/T234-2006)

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Serial Number	Indicators	Test value
		0.75mm	1.00mm	1.25mm 1.50mm		2.00mm	2.50mm	3.00mm
	小 g/cm³	0.939
2	Tensile properties
	Yield strength (stress),N/mm	11	15	18	22	29	37	44
	Breaking strength (stress),N/mm	20	27	33	40	53	67	80
	Elongation at yield%	12

	Elongation at break%	700
3	Right Angle Tear Strength, N	93	125	156	187	249	311	374
4	Puncture strength, N	240	320	400	480	640	800	960
5	resistance to environmental stress cracking (single point notch dead load tensile method),h	300

6	炭黑Carbon Black

	Carbon black content (range),%	2.0-3.0

	carbon black dispersion	9 of the 10 observation areas shall belong to level 1 or 2, and no more than 1 shall belong to level 3.

7	Oxidation induction time (OIT)
	Standard OIT,min; or	100
	High pressure OIT,min	400
8	85 ℃ oven aging (minimum average value)
	Retention% of standard OT after baking for 90d	55

	or the retention% of high pressure OIT after 90d of baking	80
9	anti-ultraviolet intensity
	Standard OT retention% after 1600h of UV exposure; or	50
	Standard OT retention% after 1600h of UV exposure	50

10	Low temperature impact embrittlement performance at -70 ℃	By

11	Water vapor permeability coefficient gcm/(cm² · s:pa)	≤ 1.0 × 10^-13

12	Dimensional stability	±2

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