Plastic Case Catalogue 2010/2011 - OKW - #119

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119 p r o p e r t i e s o f p l a s t i c mat e r i a l s properties of plastic mat. choice of material Material Properties Recommended application Noryl Extremely good mechanical, thermal and electrical properties. Good ageing stability and weathering resistance. High stability against chemicals. Dimensionally stable, heat-resistant, self-extinguishing parts, mainly when exchanged with metal. Component parts and cases for entertainment industry and data processing units. Polyamide Thermoplastic with high temperature stability, extremely solid and tenacious. Good sliding properties and high capacity of resistance to wear. Contact with humidity may result in a change of properties. Ideally suited for technical application, especially for machine elements with complicated geometry. Polycarbonate Thermoplastic with high temperature stability with excellent resistance to all kinds of temperature. On the whole, good resistance against chemicals and UV-light. Recommended for cases housing instruments and general indoor and outdoor application. Not recommended for use with strong alkalis or for direct exposure to sunlight. PC-ABS Blend Good stability in case of high temperature combined with enormous im- pact strength as well as toughness at subzero temperature. On the whole, good resistance against chemicals. UV-light may have a negative effect. Ideally suited for indoor use with moderate corrosive conditions. Limited outdoor suitability. Special materials comply with ball-thrust hardness test according to VDE 700 at 125°C. ABS Good resistance against medium temperature combined with good impact strength (only certain types) and antistatic adjustment. On the whole, good resistance against chemicals. UV-light may have a negative effect. Cases and operating elements of all kinds. Indoor use, also suitable for low temperature. Limited outdoor application. Suitable for galvanic coating. Polystyrene Normally brittle and resistant to fairly low temperature. SB-types are impact resistant and less sensitive to tearing under pressure. Glossy surface. Metal-cutting is possible. For cases and operating elements with working temperature of less than 65°C. Suitable for indoor use. Exposure to UV-light should be avoided. PMMA (plexiglass®) Good mechanical properties, slightly brittle. Superior from optical point of view. Permeable to light up to 92 % for certain types. Cases and front panels for infrared transmitters and receivers as well as transparent parts. combustibility test for plastics according to ul subject 94 Fire classification Test UL 94 V-0 The test samples are extinguished within 50 seconds average time (mean of 10 successive tests). None of the test samples burns longer than 10 seconds. None of the test samples emits burning particles. UL 94 V-1 The test samples are extinguished within 250 seconds average time (mean of 10 successive tests). None of the test samples burns longer than 30 seconds. None of the test samples emits burning particles. UL 94 V-2 Same test as UL 94 V–1, but the test samples emit burning particles during the test. The test samples mentioned above are extinguished in all cases. If the test samples keep burning after 30 seconds, a horizontal test can be carried out to reach the classification UL 94 HB. environment The standard products available from OKW Gehäusesysteme, in particular the plastic parts and packaging, meet the statutory requirements with respect to the use of hazardous, polluting and critical substances, as well as heavy metals and flame proofing agents containing bromine, in accordance with the EC directives WEEE, RoHS. In the development of products, we follow the ecodesign directive 2005/32/EC. We constantly attempt to reduce possible effects on the environment. important reference The plastic properties on pages 120/121 are exclusively applicable for the specified standard test pieces. This does not exempt you from carrying out your own tests. The application, utilisation and subsequent processing are beyond our control and the responsibility for this therefore rests solely with you. Up-to-date material data sheets are also available on the Internet at www.okw.com PLASTICS PA RTS TOLERANCES Dimensional and form deviations occur in the production of injection-moulded plastic parts. The maximum permissible deviations from the nominal dimensions are listed in DIN 16901 T130.