[资料] 电路板UL认证标准要求

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实习生

发表于 2017-11-2 14:28:39   879 查看 1 回复 显示全部楼层 倒序浏览
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PERFORMANCE PROFILE LEVELS OF BASE MATERIAL OF PRINTED WIRING BOARDS
THAT PROVIDE DIRECT SUPPORT OF CURRENT-CARRYING PARTS


Test#
Unit V-0, V-1,
V-2, HB
Thkns, in.+
High-current-arc ignition Max PLC 3 Actual@
Hot-wire ignition Max PLC 4 Actual@
Volume resistivity - dry Min meg-ohm cm 50 1/16
Volume resistivity - wet Min meg-ohm cm 10 1/16
Dielectric strength - dry kV per mm 6.89 1/16
Dielectric strength - wet — 6.89 1/16
Comparative Tracking Index Max PLC 4 1/16
Heat deflection °C * 1/8
# Testing is intended to be as described in ANSI/UL 746A, "Polymeric Materials - Short Term Property Evaluations."

+ Test sample thickness on which the index is to be based.

@ Actual thickness or minimum thickness of material being considered.

* Not required for thermoset; for thermoplastics, at least 10°C (18°F) above rated operating temperature with 90°C (194°F) minimum value.

Comparative Tracking Index (CTI; ASTM D3638 ) — Expressed as that voltage which causes tracking on a printed wiring board base material after 50 drops of a 0.1% ammonium chloride solution has fallen on the material. CTI is not investigated for "Flammability Only" boards and should be considered during the end-product investigation.

CTI Range-tracking Index (TI in Volts) Assigned PLC
600 and greater 0
400 and up to 600 1
250 and up to 400 2
175 and up to 250 3
100 and up to 175 4
Less than 100 5
The CTI Performance Level Category (PLC) of a printed wiring board is dependent on the CTI PLC of the base material used to make the board. The CTI PLC may be identified to facilitate OEM selection of printed wiring boards for applications in which the CTI rating is significant.

The above electrical properties may be determined by means of the applicable ASTM and/or UL specification in ANSI/UL 746A.


实习生

发表于 2017-11-2 14:28:55    楼主|
详询sunny 139-1314-2465
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