Avoid Failure, Improve Performance, and Reduce Cost :. Surface Modify Your Geosynthetics with Fluoro-Seal Reactive Gas Treatments.
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Surface Modify Your Geosynthetics with Fluoro-Seal Reactive Gas Treatments
Fluoro-Seal treatments with elemental reactive gas create chemical change in the exposed surface molecules of thermoplastics, including geosynthetics. Reactive gas molecules bond to and chemically modify all exposed surfaces. The treatment has been used for many years to increase hydrocarbon barrier properties and enhance adhesive bonding to coatings, sealants, and epoxies.
Increase Permeation Resistance
As Well As
For example, polyethylene liners have traditionally been joined with heat seaming and mechanical attachment. Use of adhesives and coatings have been out of the question due to poor adhesion.
But good quality “structural” adhesion is now possible by chemically changing the surface of geomembranes through Fluoro-Seal reactive gas initiated surface modification. The process provides a surface treatment similar to corona, plasma, or flame treatments, while going deeper into the material with a much more effective and long term change of surface chemistry.
Reliable “structural” adhesive assembly through Fluoro-Seal surface modification means
1) Better installation and repair opportunities in field applications,
2) More reliable methods for bonding dissimilar materials such as concrete, steel, and different polymers
3) New opportunities for improved efficiencies in pre-fabrication assemblies,
4) The option to bond over 100% of contact surface areas (as opposed to edge or spot connections only),
5) Secondary supplemental seaming for liability protection in leak-prone locations as desired, and
6) The bonding and application of beneficial paints and coatings
7) New opportunities for the assembly of geosynthetic composites
Results =Film Tear Bond
Adhesive connection is stronger than tear strength of the geomembrane
Meets most rigorous requirement even for heat seaming
Adhesive bond strength exceeds tear strength of 100 mil (2.5mm) thick HDPE – a remarkable performance for adhesive bonding
With Surface Modification Many Different Geosynthetics Can be Reliably Bonded to Similar and Dissimilar Materials Including Concrete and Steel as Shown Here with Geonet
Battening leaks around bolt holes and bolt threads
Once saturated, neoprene gaskets will leak
Silicone seals of battening do not last
Batten Strips and Gasketing Can Also Be Expensive
Fluoro-Seal Surface Modified HDPE Adhesively Bonded to Concrete was Subjected to Pullout Tests using Large Flathead Bolts Glued to the Bonded Membrane. When Cut Around the Bolt Head with a Circle Saw and Pulled out with a Tensometer, the Specimens Broke in the Concrete not the Adhesive Connection
Pullout strengths for the adhesively bonded surface modified HDPE were 2 – 8 times as great as the pullout strengths of concrete embedment liners molded into bricks. The fact that adhesive bonding covers a larger area, versus being limited to the locations of embedded studs, means that corresponding pullout resistance per unit area is much higher for the adhesive bonded SMHDPE than for the CEL’s.
Samples at 90 F
Samples at 180 F
Excellent Bonding to Concrete Held up through Repeated Thermal Cycling Tests as Well. Expansion/ Contraction Forces are too Low to Relax Bonding.
Polyethylene Pipe and Fittings for Example Can be Joined with the Help of Adhesives and are no Longer Restricted to Sometimes Cumbersome and Expensive Heat Seaming
Surface modifying penetrations and adjacent skirting allows supplementing the construction with properly bonded sealants to provide insurance against leakage
Fluoro-Seal surface modification enables do-it-yourself routine repairs, and supplemental sealing for liability protection, in addition to hydrocarbon diffusion resistant containment.
Traditional Repair Options for Such Cases Require Hiring Trained and Specialized Technicians with the Right Equipment- Expensive Over the Impoundment Life
Trowel-able Sealants and Adhesives Can be Spread to Bond Entire Surfaces of Geomembrane to Concrete and Other Materials for Longterm Durability and Leakage Interception
Sections Bonded to Concrete Offer Built – In Leak Protection and Wrinkle Free Construction
Not Only Does Fluoro-Seal Treatment Make Geosynthetics Bond with Epoxy Adhesives, but the Surface Modification Makes Longterm Application of Paints and other Coatings Possible for Decorative or Performance Related Purposes
Adhesive Bonding and Coating Applications are Essentially Unlimited. Any Assembly which Benefits from Structural Adhesion of Thermoplastics - Bonding to Themselves or Other Substrates Should be Considered. Just Let Your Imagination Soar.
Fluoro-Seal Treatment Will also…
Increase Permeation Resistance
*Rowe, K.R. “Geosynthetics and the Minimization of Contaminant Migration through Barrier Systems Beneath Solid Waste”, Keynote Lecture, Proceedings of 6th International Conference on Geosynthetics, Atlanta Georgia, March 1998, pg 27 - 102.
For a typically well-inspected installation, permeation is the governing rate for aquifer contamination. It has been calculated that for different reasonable scenarios of clay adsorption and biodegradability, and typical Municipal Solid Waste landfill source concentrations, toluene (which has a drinking water limit of 24 ppb) would range from approximately 5 to 500 ppb in an aquifer 3 m underneath a 60 mil HDPE geomembrane and 2 ft compacted clay composite liner system (Rowe, pg 64). Clearly, the risk of contaminated groundwater is present in this typical case ! The solution to eliminate such risk is to specify very thick clay layers, or to specify better hydrocarbon barriers.
Rowe, K.R. “Geosynthetics and the Minimization of Contaminant Migration through Barrier Systems Beneath Solid Waste”, Keynote Lecture, Proceedings of 6th International Conference on Geosynthetics, Atlanta Georgia, March 1998, pg 27 - 102.
Acid Runoff in this Trench at a South American Mine, Together with High Altitude Sunlight, has Oxidized and Degraded with Brittle Fracture this HDPE Drainage Ditch Liner . The Geomembrane could have benefited from the extra protection of Surface Modification.
As tested in constant load stress crack testing, ASTM D 5397, Fluoro-Seal surface modification has enabled otherwise poor stress crack resistant resins to perform well.
By Significantly Reducing Hydrocarbon Diffusion, Fluoro-Seal Treatment Can Extend the Time of Migration and Depletion of Geomembrane Antioxidants and Thus Extend the Lifetime of Geomembranes
Fluoro-Seal Reactive Gas Initiated Surface Modification of Geosynthetics Improves Key Properties Related to :
Improved Assembly, Improved Installation, and More Secure Containment
Best Available Technology has Improved!