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  • Elastomer, Elastomers | Era Polymers
    components reaction cure and demould DEGRADATION The deterioration of a substance caused by contact with its environment DEMOULD TIME The time between dispensing the liquid components into the mould and removing the article being produced DEW POINT The temperature at which a vapour begins to condense ELASTOMER A flexible or semi rigid rubber like material not necessarily made from what is conventionally thought of as a rubber ELONGATION The increase in length of a specimen at the instant before rupture occurs Expressed as a percent of original length EXOTHERM Heat generated by a chemical reaction FLAME RETARDANT A substance which is added to a polymer formulation to reduce or retard its tendency to burn HARDNESS The surface property relating to the resistance of indentation HYDROXYL GROUP The combined oxygen and hydrogen radical OH which forms the reactive group in polyols IMPACT RESISTANCE Ability to withstand mechanical or physical blows without the loss of protective properties ISOCYANATE The family name of chemical compounds having one or more NCO groups attached to the main chain MDI An abbreviation for diphenyl M ethane D i I socyanate MICROCELLULAR An elastomer of cellular or foam structure MIL One thousandth of an inch 0 001 inch A unit used to measure coating thickness MOULDING The process of producing a finished article from a closed mould NDI N apthalene D i I socyanate NCO N itrogen C arbon O xygen The chemical formula for an isocyanate group POLYESTER Polymeric compound with the reactive hydroxyl groups containing ester linkages POLYETHER Polymeric compounds with reactive hydroxyl groups containing ether linkages POLYMER A high molecular weight compound natural or synthetic whose chemical structure can be represented by a repeated small unit POLYOL A chemical compound with more than one reactive hydroxyl group attached to the molecule POST CURE The

    Original URL path: http://www.erapol.com.au/technical/elastomer/elastomers-glossary-of-terms/ (2015-10-06)
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  • Foam, Foams | Era Polymers
    Storage Chemical Resistance Chart Troubleshooting ELASTOMERS Glossary of Terms Foam Systems Applications Properties Processing Guide Troubleshooting FOAMS Glossary of Terms Coating Systems Our Laboratories Testing Equipment Standard Laboratory Tests Other Laboratory Tests MSDS MSDS Australia MSDS USA Downloads Contact MENU CLOSE back Foam Systems Polyurethane foams play a part in our every day lives whether directly or indirectly Foams play a vital part in insulation and keep our refrigerators cold our hot water heaters hot and our buildings cool Foams also play a major part in keeping us comfortable whether that be the soft cushions covering our seats and chairs to the outer and inner shoe soles we use in our footwear Foams are naturally full of bubbles and most of these bubbles are formed when the ISOCYANATE reacts with the POLYOL Inside the polyol are materials called BLOWING AGENTS which cause the foam to expand through bubble formation Era Polymers has three main foam categories organised into the types of blowing agents used in the formulas 1 GREENLINK these foams are based on ordinary water to act as the blowing agent 2 ERATHANE more traditional foams based on HCFC blowing agents such as 141b These are being slowly phased

    Original URL path: http://www.erapol.com.au/technical/foam/ (2015-10-06)
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  • Applications | Era Polymers
    Systems Applications Properties Processing Guide Troubleshooting FOAMS Glossary of Terms Coating Systems Our Laboratories Testing Equipment Standard Laboratory Tests Other Laboratory Tests MSDS MSDS Australia MSDS USA Downloads Contact MENU CLOSE back Applications Industry Application Automotive Steering wheels dashboards seating roof liners door liners sound underlay sun visors jounce bumpers air filters Building and Construction Wall and ceiling panel cores spray insulation Footwear Outer soles mid soles inner soles Furniture

    Original URL path: http://www.erapol.com.au/technical/foam/applications/ (2015-10-06)
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  • Properties | Era Polymers
    the final foam has lost its tackiness and can then be handled if required Standard laboratory cup mix of a polyurethane foam going through its various stages 2 Density Density is one of the main methods of categorizing foams Density is expressed as weight per unit volume so in most cases this is kg m3 or lb ft 3 In general most polyurethane foams used for insulation purposes are in the density range of 28 34kg m 3 for optimal results However there are many foams lighter than this down to 9kg m 3 through to foams of over 400kg m 3 Naturally the higher the density the stronger and harder the foam is and the more liquid chemical it will take to fill a cavity Please click here for more information on Era Polymers testing equipment 3 Thermal Insulation The major use of rigid polyurethane foams is for thermal insulation This is due to the fact that rigid polyurethane foams are one of the best insulating materials available to the insulation market today Rigid polyurethane foam is widely used in insulation applications including roof insulation wine tanks cool boxes and cold rooms The insulation performance of a material is often measured in terms of the k factor which is a measurement of the rate of heat transfer through a unit thickness across a unit area The most common units for k factor are W mK The other value often referred to is the R value which is a measure of thermal resistance based on a certain thickness of insulation R value is calculated by THICKNESS m K FACTOR to give the R value in units of K m 2 W 4 Fire Properties Polyurethane foams are carbon based and inherently flammable However with the inclusion of special fire retardants

    Original URL path: http://www.erapol.com.au/technical/foam/properties/ (2015-10-06)
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  • Processing Guide | Era Polymers
    Polymers representative for further advice Polyol POLYOL The POLYOL component contains the low boiling point blowing agents used to expand the foam At elevated temperatures the blowing agents can cause pressure to build in the drum caution should be exercised when opening the drum in case of any internal pressure 2 Chemical Reaction When the ISO component is mixed with the POLYOL component the chemical reaction starts The reaction is exothermic meaning it produces heat As the chemical reaction progresses the viscosity measure of liquid thickness of the mixture will also increase This continues during the foaming process until the reacting liquid turns into the polyurethane solid at the end of the reaction In order to achieve a good quality foam the temperature of the components should ideally be around 20 25 o C 68 77 o F If they are colder than this the material will be thicker and more difficult to blend and the final yield of the foam will be less If the temperature of the chemicals is above 25 o C 77 o F the reaction time of the formulation will become faster which should be taken into account for individual customers circumstances 3 Mixing Process It is important to mix the POLYOL and ISO component efficiently and unlike polyurethane elastomers it is also important to mix in air This incorporation of air is called nucleation and is observed as tiny bubbles trapped in the mixed liquid These act as growth points for the bubbles produced during the foaming reaction and result in the cellular structure of the foam Hand Mixing Many systems have a slow enough cream time which enables them to be hand mixed For hand mixing a drill capable of speeds of over 2000rpm should be used Generally the stirrer used should have

    Original URL path: http://www.erapol.com.au/technical/foam/processing-guide/ (2015-10-06)
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  • Troubleshooting | Era Polymers
    Coating Green Mountain Icynene Irathane Futura Klingstone Perstorp Stepan Technical Elastomer Systems Applications Properties Mix Ratio Calculations Effects of Curative Levels Shelf Life and Storage Chemical Resistance Chart Troubleshooting ELASTOMERS Glossary of Terms Foam Systems Applications Properties Processing Guide Troubleshooting FOAMS Glossary of Terms Coating Systems Our Laboratories Testing Equipment Standard Laboratory Tests Other Laboratory Tests MSDS MSDS Australia MSDS USA Downloads Contact MENU CLOSE back Trouble Shooting The table

    Original URL path: http://www.erapol.com.au/technical/foam/troubleshooting/ (2015-10-06)
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  • Foam, Foams | Era Polymers
    for mould preparation including release agent application dispensing of components reaction cure and demould DEAD TIME A foam which only slowly regains its original shape after deformation DEMOULD TIME The time between dispensing the liquid components into the mould and removing the article being produced DENSITY The weight per unit volume of the foam normally expressed in kg m3 Core Density Density at or near the centre of the foam Overall Density Density of the foam including any moulded skin Free Rise Density Usually measured in kg m3 It can be free rise or packed into a mould DEW POINT The temperature at which a vapour begins to condense ELONGATION The increase in length of a specimen at the instant before rupture occurs Expressed as a present of original length EXOTHERM The heat released by the foam reaction The heat can accelerate the foaming process FILLER An unreactive material added to the polyurethane mixture They usually solid materials such as glass and silica FLAME RETARDANT A substance which is added to a polymer formulation to reduce or retard its tendency to burn FRIABLE Refers to the crumbling or powdering of a foam when the surface is rubbed GEL TIME The time when the foam has developed enough gel strength to be dimensionally stable HARDNESS The surface property relating to the resistance of indentation HYDROLOSIS The breakdown of polymers in the presence of water HYDROXYL GROUP The combined oxygen and hydrogen radical OH which forms the reactive group in polyols IMPACT RESISTANCE Ability to withstand mechanical or physical blows without the loss of protective properties IMPINGEMENT A technique of mixing through high velocity contact of the two streams ISOCYANATE The family name of chemical compounds having one o more NCO groups attached to the main chain K VALUE The heat transfer coefficient commonly used to compare the insulation values of different materials The lower the K value the better the insulator MDI An abbreviation for diphenyl M ethane D i I socyanate MICROCELLULAR An elastomer of cellular structure having a density between 1 3 and 1 2 MIX TIME Time in seconds a foam mixture has to be mixed before pouring into a mould MIL One thousandth of an inch 0 001 inch A unit used to measure coating thickness MOULDED DENSITY The density of a foam when expanded and cured in its final shape MOULDING The process of producing a finished article from a closed mould NDI N apthalene D i I socyanate NCO N itrogen C arbon O xygen The chemical formula for an isocyanate group OPEN POUR The dispensed foam mixture is placed in an open mould allowing it to free rise OVER PACKING Purposely adding more material to the mould than is required to just fill it This technique is used for increasing the density of the finished moulded part POLYISOCYANURATE PIR A modified type of polyurethane foam which exhibits improved resistance to high temperatures POLYESTER Polymeric compound with the reactive hydroxyl groups containing ester linkages POLYETHER

    Original URL path: http://www.erapol.com.au/technical/foam/foams-glossary-of-terms/ (2015-10-06)
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  • Our Laboratories | Era Polymers
    of Curative Levels Shelf Life and Storage Chemical Resistance Chart Troubleshooting ELASTOMERS Glossary of Terms Foam Systems Applications Properties Processing Guide Troubleshooting FOAMS Glossary of Terms Coating Systems Our Laboratories Testing Equipment Standard Laboratory Tests Other Laboratory Tests MSDS MSDS Australia MSDS USA Downloads Contact MENU CLOSE back Our Laboratories The Era Polymers laboratories in Sydney which are NATA accredited are arguably the foundation of our success There are specific

    Original URL path: http://www.erapol.com.au/technical/our-laboratories/ (2015-10-06)
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