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  • Elastomer, Elastomers | Era Polymers
    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 Elastomer Systems What are Polyurethane Elastomers To the Chemist they are polymeric materials containing urethane groups NH CO O produced by the reaction of a polyol curative with an isocyanate prepolymer To the Engineer they are materials offering a number of unique properties which enable products to be manufactured to meet a range of demanding applications To the Accountant they are materials which can be processed with low energy consumption and relatively low capital outlay for machinery to yield products which show cost savings through improved performance Polyurethane Elastomers combine many of the advantages of rigid plastics metals and ceramics with the extensibility of rubber It is not claimed that Polyurethanes are the answer to all problems but they are extremely versatile and this is the key to their widespread and growing use There are many different types of polyurethane prepolymers which when combined with a suitable curative will set into a solid

    Original URL path: http://www.erapol.com.au/technical/elastomer/ (2015-10-06)
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  • Applications | Era Polymers
    has led to many instances of Erapol Polyurethane Elastomers replacing metal rubber wood and plastic Some applications include Industry Applications Automotive Grommets bearings bushes flexible couplings Building and Construction Moulds for concrete gate seals concrete pump ports waterproofing Coated Fabrics Conveyor belts fuel storage tanks power transmission belts Electrical Encapsulation insulation potting cable joining Engineered Components Gears sprockets wire guides rail draft gear stripper plates press brake pads textile yarn

    Original URL path: http://www.erapol.com.au/technical/elastomer/applications/ (2015-10-06)
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  • Properties | Era Polymers
    is a strong indication of toughness In actual use especially in impingement abrasion applications high tear strength is important Erapol elastomers have a distinct advantage in this application over conventional rubber To test the Tear Strength of a material you use the Istron Machine is used for more information on this click here 7 RESILIENCE Resilience in conventional rubbers is generally a function of hardness This often undesirable relationship does not hold true with Erapol elastomers Formulations are available in a very wide range of resilience For very shock absorbing uses low rebound compounds are usually used eg rebound values of 10 40 For high frequency vibrations or where quick recovery is required compounds in the 40 65 rebound value are used In general toughness is enhanced by resilience For more information on Resilience Testing click here 8 FLEX PROPERTIES Erapol elastomers resist cracking under repeated flexing As with any elastomer the rate of cut growth under flexing may be reduced by decreasing the thickness of the part Unlike other elastomers however Erapol elastomers can be used practically in very thin sections because of their strength and toughness 9 LOW TEMPERATURE PROPERTIES Many Erapol elastomers remain flexible at very low temperatures and possess outstanding resistance to thermal shock The low temperature resistance of Erapol s has led to many applications in below 0 o C 32 o F conditions 10 DRY HEAT RESISTANCE Whilst many Erapol elastomers are only suitable for continuous operation up to 90 o C 194 o F intermittent use up to 120 o C 248 o F is possible with some specially formulated materials continuous operation up to 120 o C or even higher can be achieved Advice on the most suitable material for any particular application should be sought from our Technical Service personnel 11 WATER RESISTANCE Depending on the type Erapol polyether backbone elastomers are very resistant to the effects of water immersion and have excellent long term stability in water up to 50 o C 122 o F Continuous use in hot water over 80 o C 176 o F is not recommended Water absorption is very low in the range of 0 3 1 by weight and volume swell is negligible For example Erapol elastomers can operate at close tolerance in water lubricated bearings without fear of seizure 12 ELECTRICAL PROPERTIES Some Erapol s have very good insulating properties and are used in many potting and encapsulating applications 13 OXYGEN AND OZONE RESISTANCE Products made from Erapol s are highly resistant to degradation by atmospheric oxygen and ozone Tests on samples aged over 500 hours in an atmosphere containing 3ppm ozone show no attack even while under 20 strain Past experience has shown that materials which resist this concentration for several hundred hours are virtually immune to attack by normal atmospheric concentrations This makes Erapol s highly successful when employed around electrical equipment without the hardening and cracking often experienced with conventional elastomers and indeed many plastics 14 OIL GREASE AND CHEMICAL

    Original URL path: http://www.erapol.com.au/technical/elastomer/properties/ (2015-10-06)
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  • Mix Ratio Calculations | Era Polymers
    3 1 0 2 75 85 10 8 15 E90A 4 2 0 2 75 85 12 5 10 10 E93A 5 0 0 2 75 85 15 12 8 E95A 6 25 0 25 75 85 19 15 6 EHP90A 4 6 0 2 75 85 14 11 1 8 EHP93A 5 2 0 2 75 85 15 7 12 6 8 EHP95A 5 8 0 2 75 85 17 5 14 1 5 EHP60D 7 50 0 25 60 70 22 7 18 2 3 EHP70D 9 00 0 25 60 70 27 2 22 2 ET83A 3 1 0 2 75 85 10 8 8 ET90A 4 2 0 2 75 85 12 5 10 6 ET95A 6 25 0 25 75 85 19 15 4 ET60D 7 4 0 2 60 65 21 17 3 ET65D 8 0 0 2 60 65 22 17 5 2 ET70D 9 2 0 2 60 65 25 20 1 ET75D 11 2 0 2 60 65 30 5 24 5 1 ETX65D 8 0 0 2 60 65 23 18 4 4 ETX80D 9 5 0 3 60 65 26 21 3 ETX85D 12 0 0 3 60 65 33 27 3 EMP83A 3 2 0 2 75 85 10 8 6 EMP89A 4 8 0 2 75 85 14 5 11 5 6 EMP92A 5 0 0 2 75 85 15 12 5 ETL85A 4 2 0 2 75 85 12 5 10 10 ETL91A 5 0 0 2 75 85 15 12 6 ETL94A 6 25 0 25 75 85 19 15 5 ETL69D 8 05 0 25 55 65 23 18 5 3 RN3038 3 2 0 2 75 85 9 5 7 8 3 RN3039 4 3 0 1 75 85 12 3 10 4

    Original URL path: http://www.erapol.com.au/technical/elastomer/mix-ratio-calculations/ (2015-10-06)
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  • Effects of Curative Levels | Era Polymers
    Laboratories Testing Equipment Standard Laboratory Tests Other Laboratory Tests MSDS MSDS Australia MSDS USA Downloads Contact MENU CLOSE back Effects of Curative Levels All physical properties of Erapol elastomers are sensitive to curative level The curative level is often expressed as Theory 100 theory for example means the curative level used is the exact amount required to react with the prepolymer The table shows how Physical Properties vary with Theory

    Original URL path: http://www.erapol.com.au/technical/elastomer/effects-of-curative-levels/ (2015-10-06)
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  • Shelf Life and Storage | Era Polymers
    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 Shelf life and storage Most Erapol brand prepolymers have a shelf life of at least 12 months from date of manufacture when stored unopened in their original containers at temperatures less than 25 o C 77 o F All Erapol products are packaged and sealed with a blanket of Nitrogen gas When the container is opened and the Nitrogen is replaced with humid air the isocyanate content of the prepolymer NCO can drop due to a reaction of the moisture with the prepolymer If the NCO drops too much the material can be damaged which will result in poor physical properties in the finished product Hence partial containers of prepolymer should be re sealed with nitrogen or dry air to prevent moisture contamination Whilst elastomer processes should always have access to nitrogen gas Era Polymers can also supply Erapurge which is dry air in an aerosol can Effects of Heating Pre Polymers The NCO content of all prepolymers will decrease with time and especially

    Original URL path: http://www.erapol.com.au/technical/elastomer/shelf-life-and-storage/ (2015-10-06)
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  • Chemical Resistance Chart | Era Polymers
    table For more detailed information please contact our Technical Service Department The following ratings are used to describe the general performance of Erapols when immersed at ambient temperatures A Recommended Little or no effect B Minor to moderate effect C Moderate to severe effect X Not recommended Acetic Acid C Cyclohexane B Oleic Acid B Acetone X Ferric Chloride A Olive oil A Ammonia Hydroxide A FREON 12 54C A Oxygen cold A Ammonium Nitrate X FREON 113 B Ozone A Ammonium Persulfate X Gasoline A Palmitic Acid A Animal Fats A Gelatin A Phosphoric Acid 20 A ASTM Oil 1 70 o C A Glucose A Phosphoric Acid 45 A ASTM reference fuel A Glue A Potassium Chloride A Barium Chloride A Glycerin A Potassium Cupro Cyanide A Barium Hydroxide A Hydrochloric Acid cold 37 X Potassium Cyanide A Barium Sulfate A Hydrochloric Acod hot 37 X Potassium dichromate A Barium Sulfide A Hydrofluoric Acid conc cold X Potassium nitrate A Borax A Hydrofluoric Acid conc hot X Potassium sulphate A Boric Acid A Hydrogen Gas A Producer gas A Butane A Isopropyl Acetate A Radiation A Calcium Bisulphite A Kerosene B Soap solutions A Calcium Chloride A LPG

    Original URL path: http://www.erapol.com.au/technical/elastomer/chemical-resistance-chart/ (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/elastomer/troubleshooting/ (2015-10-06)
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