THERMOPLASTIC ELASTOMERIC RUBBER LINER - ChemStop

THERMOPLASTIC ELASTOMERIC RUBBER LINER

Edit this master specification per job specific requirements. Product selection is the decision of the
customer. We strongly encourage you to consider WESTEC as a sole source. There are no equals.
PART 1 GENERAL
1.01 SECTION INCLUDES:

A. Provision of synthetic geomembrane liner for containment of acids, bases, alcohol’s, oils, solvents
or chemicals. Furnishing, fabricating, and installing a permanent synthetic geomembrane liner to
create a continuous diaphragm to prevent fluid migration.

1.02 QUALITY ASSURANCE
A. Liner splicing defects which are unacceptable include, but are not limited to:
1. Use of adhesives, solvents, and free lap joints
2. Misalignment that causes buckling.
3. Visible porosity in the welded joint, including pinholes, charred or burnt material.
4. Visible signs of splice separation.

1.03 SUBMITTALS
A. Submit liner fabricator and installer qualifications.
B. Submit manufacturer’s test data for chemical resistance.
C. Submit shop drawings and fabrication drawings prepared by membrane fabricator. Drawings to
include proposed panel layout to cover liner area indicated on plans. Shop drawings to indicate
direction of factory seams and panel sizes. Indicate termination of panels at the liner perimeter,
method of sealing penetrations and anchoring methods.
D. Submit quality inspection certification of factory fabricated seams.

PART 2 PRODUCTS
2.01 MANUFACTURER

A. Westec Barrier Technologies, A Greenstreak Group Company
3400 Tree Court Industrial Blvd
St. Louis, MO 63122
636 225 9400
636 225 2049
Geomembrane liner to be Westec Tuff-Guard Thermoplastic Elastomeric Rubber [60 mil] [80 mil]
[100 mil] thick.

2.02 CHEMICAL RESISTANT LINER MATERIAL
A. WESTEC Thermoplastic Elastomeric Rubber (TPER): Synthetic rubber with high resistance to
wide range of oils, solvents and chemicals and not readily soluble in common solvents.
B. Chemical Resistance testing to be performed by independent ASTM certified laboratory.

Important to the integrity of you secondary containment structure is the liner’s performance after chemical exposure.
Indicate your desired percent retention of physical properties below. Call WESTEC for assistance in making your
selection. Suitability of a material for a specific chemical or fuel application is best determined by application specific testing. Vapor
Permeability may be important for your project. See separate WESTEC Tuff-Guard Vapor Permeability
report. Performance data may be incorporated into the specification when applicable.

MATERIAL PROPERTIES

Property Test Method Performance Unexposed
Tensile ASTM D 412 1800 psi (12.5 MPa)
Ultimate Elongation ASTM D 412 450%
100% Modulus ASTM D 412 1000 psi (6.9 Mpa)
Shore A Hardness ASTM D 2240 85+/-5 units
Brittle Point ASTM D 746 -70F/-57C
Ozone Resistance ASTM D 1171 Passed 450 pphm
Peel Strength ASTM D-816 mod 22 pli

Liner to retain no less than 70% of material properties after 7 day chemical immersion (per ASTM D471)

2.03 LINER SHOP SEAM FABRICATORS

A. Splices to be free from defects as defined in “Quality Assurance” article in Part 1.
B. Factory fabricate into large sheets custom designed for this project to minimize field seaming if

possible.
C. No fish mouths are allowed in seamed areas.
D. Fusion welding technique to be [Single Wedge] Double Wedge with pressure applied to full width

of melted seam area.

PART 3 EXECUTION

3.01 EXAMINATION

A. Site considerations.
1. Start from upwind side of containment and proceed downwind.
2. Hold leading edge of liner down with sandbags during high winds.
3. Ambient temperature must be above 20°F. for welding.
4. Wear soft soled shoes when walking or working upon the liner.
5. Remove dust, sand, condensation and other contaminants from splice edge of
membrane.

3.02 SUBGRADE PREPARATION (for placement on soil)

A. Compact subgrade to density to allow movement of vehicles and welding equipment without
rutting. Typically this requires a density of 85-90 % Standard Proctor. Fill cracks voids and
washouts to ensure firm, clean dry and smooth condition during liner installation. Remove abrupt
changes in grade.

B. For highly irregular and rough soils, provide a needle punched polypropylene geotextile fabric as
a protection and reinforcement layer under the membrane liner.

C. Remove water on surface to be lined prior to deployment and seaming of liner.
D. Remove broken stones and hard objects from surface to be lined. Stones larger than 2 inches,

sharp stones of all sizes and hard objects are not permitted within four inches of the surface to be
lined. No object larger than USCS and (SP) should be in direct contact with membrane.
E. Subgrade to be free from roots, grass and vegetation. Remove foreign materials and protrusions.
F. Provide certification of subgrade acceptance prior to commencing installation of liner.

3.03 LINER SEAM FABRICATION

A. Heat fuse weld per requirements for shop fabricated seams.
B. Use extrusion weld process for detail work in the field at penetrations and around structures.
C. Lap minimum 4 inches at fusion welds and 6 inches at extrusion welds.

3.04 FIELD QUALITY ASSURANCE
A. Each day before liner production, provide one 5 foot long liner seam test sample.
B. Test weld seam in shear and peel per ASTM methods. Test four coupons using field tensiometer
or peel tester. Test seams to meet minimum specified values for peel and shear.
C. Test samples must exhibit Film Tear Bonding (FTB)
D. Test Single Wedge seams by Vacuum Box Technique of 5 PSIG for 15 seconds.
E. Test Double Wedge seams by pressure of 25-30 PSIG. Static pressure must be maintained
within 2 PSI in 5 minutes.
F. Perform destructive seam sampling and testing per field engineer requirements. Each sample to
be cut in thirds. One third to be tested for shear and peel. The remaining two thirds for archive
records.

3.05 FIELD IDENTIFICATION AND REPAIR OF DEFECTS
A. Identify and repair defects in the membrane. Replace or cover and seal lining distress due to
scuffing, penetration, or rough subgrade with additional layer of lining of the proper size.
B. Repair the lining with the lining material. Patch to have rounded corners and extend a minimum of
four inches in all direction from the distressed area.
C. Seam repairs or seams that are questionable should be cap stripped with a one-inch wide strip of
liner material.

3.06 TERMINATION OF LINER BY POST-APPLIED MECHANICAL FASTENERS AT CONCRETE
A. Grind surface of concrete clean and smooth at location of bond for liner.
B. Prepare existing concrete by grinding away irregularities. Clean concrete.
C. Mechanically fasten waterstop to concrete using stainless steel batten bars and concrete
fasteners 6 inches O.C. maximum. Use gasket and stainless steel batten bars per manufacturer’s
termination detail.

3.07 TERMINATION OF LINER TO PRE-APPLIED ANCHOR IN CONCRETE
A. Use WESTEC 635 anchor embedded in concrete
B. Nail 635 anchor onto form face at correct elevation. Place nails 4 inches o.c. staggered top and
bottom.
C. Vibrate concrete at WESTEC anchor to ensure good consolidation around all anchor legs.
D. Attach liner edge at concrete to embedded WESTEC anchor by heat fusion extrusion welding.

3400 Tree Court Industrial Blvd
St. Louis, MO 63122
Call 1-800-7-WESTEC www.chemstop.com