AEROSIL® for Adhesives and Sealants - Adhesives & Sealants by ...

How a chemical plug functions:drill holestoneworkscreen caseglasscartridgecontainingreactionresinglasscartridgecontainingreactionresinsteel pinor boltnutAEROSIL® – Advantages for Chemical BondingAEROSIL® provides the construction industry with the strength to hang in thereChemical plugs are composite anchorcartridges which have the followingadvantages over mechanical plugs anddowels:• Adaptation to uneven drill holes• High break resistance due to elasticity• Simple handling at building site• Corrosion inhibiting effectChemical plugs are available for use inconcrete applications, hollow block andaerated concrete constructions. They areused, for example, in the construction oftunnels to attach signs, lighting fixtures,or ventilators. One- and two-componentsystems are commercially available fordifferent applications. A standard onecomponentsystem consists of a glasscartridge containing a special syntheticresin, fillers, thixotropic agents, and asecond smaller glass cylinder containingthe hardener. In order to anchor steel pinsused in the construction of bridges, theglass cartridge is placed into the drill holeinside a screen case, and is then brokenopen with a drill or hammer. The steel pinis fixed directly into the reaction resinwhich is now beginning to cure. Improvedbonding strength is achieved betweenthe concrete, the adhesive, and the steelrod. Due to its elasticity, the system is lesslikely to crack than classical plugs,especially as a result of expansion withinthe concrete.Finally, there are also two-componentsystems available as flexible foil cartridges,so-called “side-by-side” cartridges, whichrequire the resin and hardener to be mixedwith a static mixer prior to application.These systems are advantageous if aprecise drill hole cannot be made, or ifan irregular drill hole already exists.Vinylester resins, epoxy resins, orpolyester resins make up these syntheticresins. The hydrophobic gradeAEROSIL® R 202 is especially suitable forproviding vinyl resins and epoxy resinswith an effective thixotropy, whereas thehydrophilic AEROSIL® 200 is used inpolyester resin applications.During the exothermal curing, the highdegree of thixotropy and high yield valueof the reaction resins prevent saggingon sloping and vertical surfaces duringapplication. Both AEROSIL® gradesfunction additionally as anti-settlingagent and prevent the settling of fillersin the cartridges during storage.17