Polyurethanes. PDF Ultrathan Sealing Compounds. Prädifa

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1 Polyurethanes PDF Ultrathan Sealing Compounds Prädifa

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3 TPU = Top Products made of Ultrathan Dimensional stability, accurate adherence to tolerances, extrusion and wear resistance: These attributes of Parker s PDF ULTRATHAN range of seals are the result of more than 20 years of experience we have accumulated in researching, developing and manufacturing thermoplastic polyurethanes (TPU). We have consistently advanced the development of TPU s outstanding physical properties, continually adapting these compounds to specific market needs. In addition to our proven standard products for hydraulics, pneumatics and industrial applications, we are now offering a large number of special compounds for specific requirements: These include high- and low-temperature compounds as well as hydrolysis-, acid- and alkali-resistant materials. Using advanced process technology, we ensure large-volume production of TPU precision seals at the highest levels of quality. With a newly developed gate-less injection-moulding technique for O-rings used in mini-fluid components and miniature seals for pneumatics we have responded to the ongoing industry trend toward the miniaturisation of sealing profiles. Form follows function... Applying this basic principle to the development of sealing technology solutions, form not only refers to a seal s geometry but, in a manner of speaking, to the compound from which the seal will be made. Both need to be optimally adapted to each other and, together, to the respective application, i.e. the function. That is why, in addition to designing the appropriate profiles, we also develop our compounds inhouse. If our extensive standard portfolio does not provide you with a suitable product for your application, let us know, and we ll develop a custom solution for you. Computable Extrusionresistant Stable In the area of TPU composite technology we possess comprehensive development and manufacturing know-how: from injecting TPU on pretreated plastic inlays all the way to fully automated series production of metal composite parts. No matter what task you want us to perform for you: We will deliver the appropriate solution from compounding to the finished product. Precise tolerances Wear-resistant

4 A highly successful formula: Two polyoles + one isocyanate Thermoplastic polyurethanes (TPU) belong to the material category of thermoplastic elastomers and are produced from three primary raw materials: Long-chained polyoles form the soft segment, which has a major influence on the media compatibility and resistance of TPU compounds. Short-chained polyoles form the hard segment. They have a crucial impact on compound hardness and are responsible for physical crosslinking. Isocyanate is the connecting link between the polyoles. Isocyanate forms the macromolecule, i.e. the finished plastic compound, via step-growth polymerization reactions. Isocyanate and polyole react by forming the urethane group, which has given its name to this category of compounds. Through a suitable combination of hard and soft segments, TPU compounds can be optimised across a broad range of properties. Combined with Parker s sealing technology know-how, this results in our PDF Ultrathan sealing compounds. Parker s in-house development and manufacturing ensures optimal monitoring of all process steps and enables new compound developments to be realised in production within a short period of time. Benefits of PDF-Ultrathan sealing compounds Minimal abrasion, excellent tear strength, good dynamic behaviour, outstanding extrusion resistance and excellent compatibility with mineral oils.

5 Pressure medium temperature: The magic triangle of compound selection Basically speaking, the selection of the compound that is optimally suited to your application depends on three different factors: Pressure System pressure is the major selection criterion. Under low pressure conditions, hard compounds may not respond quickly enough. This may lead to leakage. Conversely, soft compounds may be subject to stronger extrusion, thus resulting in premature seal failure. That is why the general rule applies: the higher the pressure, the harder the required compound. Medium Medium Ambient media are the second important selection factor. In addition to our standard materials, we are offering a host of compounds specifically optimised for hydrolysis and media The resulting benefits include clearly expanded service life under extremely humid conditions, with critical media or additives. Temperature Operating temperatures are the third aspect to be considered for compound selection. Again, in addition to standard materials, there are special compounds particularly suited for lowor high-temperature applications. Pressure Temperature

6 PDF-Ultrathan Sealing Compounds Hardness values are required values with a tolerance of ±5 hardness points. Hardness is measured according to DIN on standardised samples of 6 mm thickness. On finished parts, normally only micro-hardness (IHRD) can be measured according to DIN , Part 2, which leads to deviating values. The minimum temperatures stated are only provided for general reference since functional performance at low temperatures will depend on the specific type of seal, operating conditions and the type of ambient metal components. Thermoplastic materials may soften under excessively high temperatures, thus losing their pre-load. Consequently, the temperature range indicated may only be exceeded up to the short-term temperature levels stated for short periods of time, and without the presence of any mechanical stress (e.g. baking/annealing of paint). When using aggressive media or in case of increased friction, the stated temperature range may be reduced considerably. Compound: Base: Physical Properties Test Standard Dimension Hardness DIN Shore A Hardness DIN Shore D Specific Gravity (+/-0,02) DIN g/cm 3 Modulus 100% DIN MPa (min.) Modulus 100% DIN MPa (min.) Tensile strength DIN MPa (min.) Ultimate elongation DIN % (min.) Compression Set 70h/70 C DIN % (max.) Compression Set 22h/100 C DIN % (max.) Rebound resilience DIN % (min.) Tear strength DIN N/mm (min.) Low temperature (TR 10) ASTMD1329 C Temperature range C Temperature short-term C Fields of Application Hydraulics Pneumatics Rod Piston Wiper Rod Piston Valve Mini pneumatics Mining (fire resistant media, HFA/HFB based) Biologically degradable media (e.g. rape seed/ester oils) Central hydraulic media Gas springs / shock absorbers Hydraulic accumulators Diaphragms / bellows Drive belts Gear pumps / motors Automotive Chemical media (acids/lyes) Food Static seals (e.g. O-rings) Properties Media Standard material for 1 Low-pressure hydraulics 2 Restricted in low temperatures to - 20 C 3 Max. 40 C

7 P 5075 P 5007 P 5070 P 5011 P 5080 P 5010 P 5012 P 4300 P 5000 P 5001 P 5008 P 5009 P 5500 P 5062 (AU/EU) (AU) (AU/EU) (AU/EU) (AU/EU) (AU) (AU/EU) (AU) (AU) (AU/EU) (AU) (AU/EU) UNPOLAR (EU) 80 ±3 82 ±5 84 ±5 88 ±5 88 ±2 90 ±5 90 ±3 92 ±5 94 ±5 94 ±5 94 ±5 94 ±5 92 ±5 55 ± / / / / / / / / / / / / / / / / / / / / o o 1 o 1 o 1 o o o o o o 4 o o 1 o 1 o o o o o o 4 o o o o o o o o 4 o o o o o o o o o o o o 4 o o o o o o o o o o o o o 4 o o o o 4 o o o o o o o o 3 o o o o o 2 o o 5 o o o o o 2 o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o Pneumatic lip seals. Pneumatic rod seals: E5, EM Pneumatic piston seals: E4 O-Rings: V1, OV Wipers: A1, AF, AY Rod seals: B3, BD, BS, BU, GC, EL, EU, EP Piston seals: B7, KU DK Piston seal set KR Mineral oil-based materials Mineral oil and mineral oil-based pneumatic greases Also suitable for oils and greases with critical additives Highly suitable for lubricating greases Central hydraulic media Mineral oils and mineral oil-based greases Very good resistance against central hydraulic media, lubricating greases, bio media Mineral oil-based hydraulic media Suitable for HFA fluids, synthetic esters (HEES), rapeseed oild (HETG). HFA, HEES, HETG. Exceeds VDMA Guideline for hydraulic oils of water pollution category 0. Suitable for mineral oil and mineral oil-based greases. Suitahble for mineral oilbased hydraulic media. Outstanding resistance against acids and lyes, polar solents and food media. Outstanding lowtemperature and dynamic behaviour. Good wear resistance Use in water up to 80 C. and abrasion Friction-optimised. Optimised for stick-slipfree sliding. Good wear resistance Excellent high-temperature and dynamic behavior. Very good wear Good wear resistance Excellent low-temperature behaviour. Optimal hydrolysis Meets BGA and KTW Guidelines. Very good extrusion resistance, low friction, good hydrolysis 4 Special applications in chemical and food industry 5 Probably suitable; test required

8 Seal Group Europe Packing Division Parker Hannifin GmbH Prädifa - Packing Division Postfach 1641 D Bietigheim-Bissingen Telefon +49 (0) / Telefax +49 (0) / packing-europe@parker.com E. Subject to change