EZIFIX
Further information and assistance Ezifix is an innovative adhesive system and supporting data for its usage is provided here.
VHB Durability in Ezifix®Fastener Applications
TheEziFix®FasteningSystems havebeen successfully usedin the construction industry for a number of years to replace conventionally drilled friction hangers. As this is aworldfirst, there are nopredecessors for similar types ofbonding. 3M VHB™Acrylic FoamTape has undergone rigorous age testing and application durability testing since its development 20 years ago. The results of these tests clearly demonstrate its unique performance capabilities. Through the use of EziFixFX-10Primer, VHBtapewill formapermanentbondto concrete in addition to a range of other surfaces.
Durability
The polymer construction of VHB tape has long term aging resistance, which prevents any weakening of the product over time. Acrylic foam tape forms its maximumbond to a surface within 72 hours. This high-level bond strength will remain for the life of the application. The long term aging resistance lies in the polymer comprising the adhesive foam material. The chemical bonds, which make up the polymer chains, consist of carbon-carbon single bonds,which are highly resistant to energy in the formof heat or ultraviolet light aswell as chemical attack. In less durable foams or adhesives, such conditions could lead to cleavingthepolymerbackbone andthus aweakeningofmechanicalproperties. In the case of acrylic foam, however, additional cross-linking is chemically favouredover chain scission (cleavage). Thismeans that rather than undergoing a process of decomposition; the acrylate materials will tend to build modulus very slightly over extendedexposures. This translates to a stronger longer lasting bond. The use ofglassmicrospores as a reinforcingagent andmeans ofdensity reduction makes the construction inherently more resistant to moisture and chemicals than with cellular air pockets. Poor surface preparation/application technique may cause the application to fail; however, bond weakening will be evident within the first 72-hour period. The recommended tensile load for 4951 VHB tape is 110lbs/
sq.inch (706Kpa). This load capability far exceeds the requirement in an anchor application. With correct application technique 3M VHB™tapewillmaintain bond strength for the life of the application.Because of the demanding and diverse applications for the acrylic foammaterial, durability has always been a key interest in the demanding performance of this product.
SPRING STEEL FASTENERS AND ADHESIVES
One of the first concerns is the retention of tack and adhesion after exposure to elevated temperatures. Foamagedformore than 5 years at 150°F retained 92% of its peel adhesionwith initial tack and liner release still excellent. The difference in peel value suggests that this material is relatively unaffected by long term exposure to elevated temperatures. Bonds can tolerate periodic, short-term exposures to temperatures up to 300°F.
Accelerated Ageing
Accelerated ageing tests have been conducted in weather-o-meters, which subject abondto heat humidity andconcentratedultraviolet exposure. The tests were performed in dynamic shear and the samples were subjected to cycling heat, humidity and carbon arc lamp exposure. Small samples provided an increased amount of edge exposure toUV radiation. The bond strength did not deteriorate below its original performance level after exposure to 7000 hours in theweather-o-meter under these tests.Weatheringdecks inArizona, Florida and otherplaces aroundtheworldare usedto collectdata on long-termperformance of acrylic foam. These tests typically demonstrate about 100% bond strength retention after 2-5 years ageing cycles in the hot humid conditions of Florida, the hot dry and very sunny climate of Arizona and the cold to hot extremes of Minnesota. The acrylics have stood up well in tests, based on MIL STD 833, which are commonly usedtoqualifydurableproducts for the electronics industry. Under this testing protocol bonds are subjected to 1000 hours of thermal at 150°C, 1000 hours at 85°Cand 85%relative humidity and 1000 hours of thermal shockwhich cycles hourly fromfrom-50°Cto 150°C. Typically the bond strength increases over time due to the high performance PSA’smore completewet out of the surfaces. Adhesion tests have been performed on acrylic bonds which were subjected to 6 years submersion in 5%salt water and ordinary tap water. A combination of adhesive and cohesive failuremodeswas observedwhen the bond was broken which indicated very high performance levels. Long term exposure to high humidity orwater submersion can have the effect ofmaking a polymermore resilient andtolerant of high elongation.Asubsequent lowering of peak force is alsomeasured aftermany days of exposure usually of the order of 40%. This effect is typical as itparallels the increase in resilience andis the same trend seen with structural silicon materials also recognised for their durability. Drying of the bond,which occurs in a normal environmental cycle,will showthat this effect is reversible and the bond will return to the usual dry strength. After splashes or incidental contact with solvents such as fuels, alcohols, adhesive removers likeMEK, and evenweak acids or bases, no effect ismeasured on the bond performance.Only after continuous submersion in harsh fuels or solvents is softeningof thefoamexperienced.Whiletheproductmaywithstandoccasional contactwith these chemicals, continuous exposure is not recommended.
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