Liner Specifications
General Requirements
Material Specifications
• Smooth HDPE
• Textured HDPE
• Smooth LLDPE
• Textured LLDPE
• QC Specifications
Geomembrane Installation
• Field Seaming
• Inherent Properties
Drainage Net &
Geocomposite
Embed Channel
Specifications
Chemical Resistance
Information
Fusion & Extrusion
Welding
Liner Panel
Deployment
Design Details
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2. MATERIAL SPECIFICATIONS
2.4 Quality Control Specifications
- 2.4.1 Raw Materials
Resin
All resins for use in geomembrane must pass a candidate pre-approval process before being eligible for use. Each incoming railcar shall be sampled by compartment with the following testing performed and compared to the manufacturer's specifications:
1. Density: ASTM D 1505.
2. Melt Index: ASTM D 1238.
3. Infrared (IR) Spectroscopy Analysis for Additives.
4. Oxidative Induction Time (OIT): ASTM D 3895.
Additives
All incoming materials are to be tested and approved prior to use with the following testing performed and compared to the manufacturer's specifications:
1. Carbon Black Content: ASTM D 1603.
2. Oxidative Inducion Time (OIT): ASTM D 3895.
- 2.4.2 Finished Product: During Production
Inspection
Performed on each roll during manufacturing.
1. Appearance
a. Sheet surface appearance shall be monitored for flaws.
2. Thickness
A full width sample shall be cut from the end of each roll for thickness measurement.
Roll Identification
Four tags per roll should be used.
1. Outside the core.
2. On the core plug.
3. On the roll surface.
4. On the production roll sample.
Out-of-Spec. Material
Any roll not meeting the specification for any of the above inspections shall be separated from other rolls and placed on hold.
- 2.4.3 Manufacturer's Quality Assurance Testing
Sampling
Full width samples shall be taken as retains from the end of each roll to the manufacturer's laboratory.
Testing
The geomembrane quality control testing shall meet the following frequency requirements.
| Property |
Test Method |
Testing Frequency
(min.) |
|
| Thickness (smooth sheet) |
ASTM D 5199 |
per roll |
| (textured sheet) |
ASTM D 5994 |
|
|
| Asperity Height (text. sheet only) |
GRI GM12 |
every second roll |
| Alternate the measurement side for double-sided textured sheet. |
|
| Sheet Density |
ASTM D 1505/D 792 |
200,000 lb (90,000 kg) |
|
| Tensile Properties |
ASTM D 638
(Type IV Specimen @ 2 in/min) |
20,000 lb (9,000 kg) |
1. Yield Strength
2. Break Strength
3. Yield Elongation
4. Break Elongation |
|
| 2% Modulus (LLDPE only) |
ASTM D 5323 |
per each formulation |
|
| Tear Resistance |
ASTM D 1004 |
45,000 lb (20,000 kg) |
|
| Puncture Resistance |
ASTM D 4833 |
45,000 lb (20,000 kg) |
|
Axi-Symetric Break Strain
(LLDPE only) |
ASTM D 5617 |
per each formulation |
|
Stress Crack Resistance
(HDPE only) |
ASTM D 5397 (App.) |
per GRI GM10 |
|
| Carbon Black Content |
ASTM D 1603 |
20,000 lb (9,000 kg) |
|
| Carbon Black Dispersion |
ASTM D 5596 |
45,000 lb (20,000 kg) |
|
| Oxidative Induction Time (OIT) |
| Standard OIT |
ASTM D 3895 |
45,000 LB (20,000 kg) |
|
| Oven Aging at 85°C |
ASTM D 5721 |
|
| Standard OIT |
ASTM D 3895 |
per each formulation |
|
| UV Resistance |
GRI GM11 |
|
| High Pressure OIT |
ASTM D 5885 |
per each formulation |
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Welding Rod
A sample of welding rod shall be tested at the frequency of once per 25 rolls of welding rod. The following tests shall be performed on the sample:
| 1. Thickness | | ASTM D 5199 |
| 2. Density | | ASTM D 1505 |
| 3. Melt Index | | ASTM D 1238 |
| 4. Carbon Black Content | | ASTM D 1603 |
Reporting
Results from the testing shall be reviewed by the quality control manager. Material that does not meet specifications shall be identified and placed on hold. The test data shall then be transferred to the product data file for roll certification.
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