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Geosynthetics-Polyethylene geomembrane

Description Specifications Scope of Application FAQ Download

Description

High-density polyethylene (HDPE) is a thermoplastic polymer renowned for its exceptional strength, chemical resistance, and cost-effectiveness. YH HDPE geomembrane are impermeable HDPE geomembrane utilized in various civil engineering and environmental projects, offering robust mechanical properties, resistance to puncture, tear, and environmental stress cracking, making themideal for applications. YH geomembranes are available with smooth surfaces. They have been constantly used in any project not requiring enhanced frictional properties. They provide outstanding mechanical and endurance properties.

Specifications

Properties

Properties	Unit	Inspection Standards	Product Specification
Properties	Unit	Inspection Standards	0.75	1	1.25	1.5	2	2.5	3
Nominal Thickness	mm	/	0.75	1	1.25	1.5	2	2.5	3
Thickness (min. avg.)	%	ASTM D 5994	-5 -10 -15
Lowest individual for 8 out of 10 values
lowest individual for any of the 10 values
Asperity Height (min. avg.)	mm	ASTM D 7466	0.25
Density	g/cc	ASTM D 1505/D 792	0.94
Tensile Properties		ASTM D 6693 Type IV
Yield Strength	kN/m		11	15	18	22	29	37	44
Break Strength	kN/m		8	10	13	16	21	26	32
Yield Elongation	%		12	12	12	12	12	12	12
Break Elongation	%		100	100	100	100	100	100	100
Tear Resistance	N	ASTM D 1004	93	125	156	187	249	311	374
Puncture Resistance	N	ASTM D 4833	200	267	333	400	534	667	800
Stress Crack Resistance	hr	ASTM D 5397	500
Carbon Black Content	%	ASTM D 4218	2.0~3.0
Carbon Black Dispersion	/	ASTM D 5596	For 10 different views: 9 in Categories 1 or 2 and 1 in Category 3
Oxidative Induction Time(a) Standard OIT or. (b)High Pressure OIT	min	ASTM D 3895 ASTM D 5885	100min 400min
Oven Aging At 85°C Retained After90 days (a) Standard 0IT- or- (b) High Pressure OIT	%	ASTM D 5721 ASTM D 3895 ASTM D 5885	55% 80%
UV Resistance High Pressure OIT.Retained After1600hrs	%	ASTM D 7238 ASTM D 5885	50%

Application Instructions

【Construction Technology】

Base inspection→On - site measurement and lofting→Geomembrane cutting→Laying - Lap treatment →Inspection and acceptance

【Construction key points】

Installation Requirements:

· Prior to installation, the construction unit must provide a layout plan for the geomembrane installation and welding, ensuring rational selection of the laying direction to minimize stress on seams, optimize the placement of each material section, and achieve the fewest possible seams. No transverse seams are permitted on slopes exceeding 10% or within 1.5 meters of the slope toe.

· Before installation, ensure the construction surface is level, free of excessive irregularities, sharp particles, or any hard debris that may damage the geomembrane. The quality of the impermeable material must be rigorously inspected and confirmed before proceeding with installation.

· The geomembrane must be laid smoothly and snugly, minimizing wrinkles. Immediate anchoring and ballasting are required after installation. Ballast bags should be promptly placed on the laid impermeable material to prevent wind uplift. No vehicles are permitted to drive directly on the HDPE geomembrane.

· Each geomembrane section must be welded on the same day of installation, with appropriate protective measures to prevent rainwater infiltration into the underlying clay layer.

Welding Requirements:

· Welding is typically performed using dual-seam overlap welding, with extrusion welding reserved for repairs (patching or covering) in areas inaccessible to fusion welding equipment.

· The construction site must be equipped with sufficient welding apparatus to ensure continuous welding operations.

· An on-site testing laboratory with necessary inspection equipment must be established. Field inspections shall include visual examination of geomembrane seams, pressure testing, vacuum testing, and destructive testing.

· Formal welding must not commence until test specimens welded by the equipment pass trial welding verification.

· Before welding, all foreign matter such as dust and dirt must be removed from the geomembrane surface, and welding edges must be cleaned.

· During welding, monitor overlap width variations and adjust accordingly. For dual-track fusion welding, the seam overlap width must be no less than 100 mm; for extrusion welding, no less than 75 mm. The seam joint strength must not be less than that of the parent material.

· For extrusion welding, pre-bond the upper and lower membrane sheets using hot air, and remove the oxidized layer at the welding location with a grinder. The grinding width must match the extrusion welding width.

· For dual-track welding, conduct an air pressure leak test on the enclosed space formed between the two welds. For extrusion welding, employ vacuum testing or spark testing.

Advantages

· High tensile strength and fracture elongation index, strong stress, can be used in a variety of different harsh geological and climatic conditions, especially suitable for geological uneven settlement area.

· Coil width is large, can be large area construction, reduce welding surface, convenient construction.

· Good chemical stability, acid and alkali resistance, corrosion resistance.

· It has a large temperature range and a long service life.

· It has excellent resistance to environmental stress cracking.

· Good flexibility, with a high anti-seepage coefficient.

· The rough surface geomembrane has a large friction coefficient and obvious anti - slip function. It is very suitable for laying on the four - week slopes of landfills, which is more conducive to the construction of the upper structure.

Characteristics and Packaging

Item	Description
Packaging	Roll
Width (m)	1~8
Thickness (mm)	0.75~3.0
Length (m)	50~100
Roll Size (m2/roll)	50~800

Scope of Application

YH Smooth geomembrane Mainly used in water conservancy, municipal, construction,transportation,subway,tunnel and other engineering construction of seepage isolation,reinforcement and crack prevention, stability reinforcement and so on.Especially suitable for sewage treatment pond, wharf project, reservoir river dam lake dam, landfill and other similar building seepage prevention projects.

FAQ

Q1: What is a geomembrane?

A geomembrane is a synthetic membrane liner or barrier used to control fluid migration in a wide range of civil, environmental, and industrial applications.
Q2: Why should I choose a geosynthetic barrier instead of traditional clay liners?

Geosynthetics offer superior impermeability, faster installation, reduced thickness requirements, and higher chemical resistance compared to traditional compacted clay liners.
Q3: How long does a geomembrane last?

Depending on the material and environmental conditions, service life can range from 30 to over 100 years.
Q4: Is it safe for drinking water or sensitive environmental applications?

Yes, certain geomembranes are certified safe for potable water use and meet environmental regulations like NSF or GRI-GM standards.
Q5: What factors should be considered when selecting a geomembrane?

Key factors include chemical resistance, mechanical strength, UV resistance, site conditions, expected service life, and installation method.
Q6: How thick should the geomembrane be?

Common thicknesses range from 0.5 mm to 3.0 mm, depending on application requirements and site-specific conditions.
Q7: Are there international standards or specifications for geomembranes?

Yes, ASTM, ISO, and GRI (Geosynthetic Research Institute) standards provide guidelines for testing and performance.

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HDPE geomembrane

Geosynthetics-Polyethylene geomembrane

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Features & Benefits

$High tensile strength and fracture elongation index$ High tensile strength and fracture elongation index
Wide rolls, fewer welds, easier construction.
Stable, acid- & alkali-resistant, corrosion-proof
Large temperature range and a long service life
Excellent resistance to environmental stress cracking
Good flexibility, with a high anti-seepage coefficient