95 bauder.co.ukCOLD APPLIED SYSTEMSTECHNICAL GUIDE? History of Cold Applied Resins 96? Application Sequence 96TECHNICALGUIDE

bauder.ie90Bauder cold liquid applied systems are based on Poly Methyl Methacrylate (PMMA) technology. PMMA resin provides a combination of physical, mechanical and application properties which cannot be achieved with any other resin and is the result of more than 20 years of research and development in this field.THE HISTORY OF MMA AND PMMAMethyl methacrylate (MMA) was first synthesised in the early part of the 20th Century, around 1903, by Dr Otto Rohm. The resins and systems were designed to be:n Impact resistant.n Abrasion resistant and resistant to mechanical wear.n Impermeable to liquids.n Hygienically safe.n High durability.n Resistant to chemicals and weathering.n Non sensitive to humidity.n Easy to overcoat.n Variable - colour and design.n Cure / harden over the widest temperature range.The first practical and commercial applications start in the early 1930's where it was used as a base material for dentures as it gave dimensional stability, was easy to mould, had low water absorption and no toxicity. During World War II, MMA was utilised for its different properties as a shatterproof alternative to glass. The clear resin formed aircraft windshields and canopies, gun turrets and bombardier enclosures and was commonly called Plexiglas. Today, acrylic glass is still used as it is half the weight and 17 times stronger than glass.In the 1950's and 1960's MMA's were developed as bone cements for use in orthopaedic applications and are still used extensively in the dental, orthopaedic and optical sectors (contact lenses).MMA to PMMABy introducing flexibility and other properties into the MMA (PMMA) resins, new applications such as flooring, bridge deck waterproofing, balcony and roof waterproofing were possible.Curing of PMMA resinsEarly resins were cured by the application of heat, but since the 1940's chemicals / catalysts were introduced to initiate the polymerisation process, which opened up further possibilities for use of these types of resins.CatalystIn order to achieve fast curing of the PMMA resins used for the Bauder cold liquid applied systems a catalyst is added to the liquid immediately before application and stirred thoroughly. The amount of catalyst to be added varies with ambient temperature and does not need to be a precise quantity but will be somewhere between 2-6% of the mixture.Catalysing the resinCOLD LIQUID APPLIED SYSTEMS TECHNICAL GUIDE96APPLICATION SEQUENCE - ROOF AND BALCONY SYSTEMSPrimingWhenever priming is necessary it is applied to the details first, followed by the main area ensuring the primer covers to the correct minimum consumption (0.4Kg/m²).Waterproofing Upstands and DetailsA generous layer of detailing resin is applied to the upstand (min 2.0kg/m²) then the fleece is embedded into the wet resin, making sure that the fleece is fully saturated and that trapped air is pressed free using the roller.Finally, another generous layer of detailing resin is applied to the embedded fleece (min. 1.0kg/m²) and the masking tape removed while the resin is still wet.