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</center><p>mmonly run across are HB and V (V-0, V-1, or V-2). Failure to pass the ULV test is a precondition of all VTM ratings The test for flammability of plastic material used in parts for electronic devices and appliances is commonly known as ULA total ofspecimens (2 sets) are tested per thickness. These ratings are establi. hed using small-scale tests in which approximately5 by 1⁄2 inch samples are besides the ULtest. UL, the Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances includes small scale tests that evaluate the flammability of polymeric  UL, the Standard for Safety of Flammability of Plastic Materials for Parts in Devices and Appliances testing. These include: AutomotiveFMVSS AerospaceFAR Flame spreadASTM E Heat releaseASTM E Limiting Oxygen IndexASTM D or ISO Fire Test for Heat and Visible SmokeUL Surface Burning CharacteristicsUL Smoke densityASTM E  This is the highest and most flame retardant level of the ULratings. Flame ratings of HB, V-2, V-1, and V-0, are used when looking at the flame ratings for plastic materials  This method is used to determine the ULVTM-0, VTMand VTMflammability ratings of thin materials. the ignition characteristics of plastic materials. Two ULratings that code oficials c. The vertical ratings also indicate whether the test specimen dripped flaming particles that ignited a cotton indicator located below the sample. A bluemm high flame is applied to the center of the lower edge of the specimen forseconds The three vertical ratings, V2, V1 and V0 indicate that the material was tested in a vertical position and self-extinguished within a specified time after the ignition source was removed. The testing is conducted on bar and plaque specimens using a larger flame height than in vertical testing (mm vsmm) ULalso xceeds mm, or whose surface area exceeds ULStandard provides a method for rating. There are two types of pre-selection test programs conducted  ULcovers two types of testing criteria: Horizontal Burn and Vertical Burn. Five specimens of each thickness are tested after conditioning forhours atdegrees C and% RH. Each specimen is supported such that its lower end ismm above Bunsen burner tube. ULV is a test standard for materials which are already classified as ULV It is a more stringent test than ULVin several ways.</p></translate>
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