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| How to distinguish FR5 and FR4 circuit board material? |
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FR-4 according to the provisions NEMALI1-1989 defined as follows: a variety of substrates where the glass cloth impregnated with epoxy resin is formed, as long as its flame-retardant through combustibility test V-1 are known as FR-4.
Combustibility test refers coupons 17mm * 1.7mm (thickness varied) without copper substrate, a 45 degree angle on a Bunsen burner burn firmly sandwiched issued flame, after removal of the flame source. Because the sheet material has been added flame retardant, self-extinguishing effect when it is interrupted after the fire source was. during the test shall be recorded for each "spread" of seconds, adjourned to burn off after 10 trials. the total number of seconds less than 50 seconds were spread known as V-0, less than 250 seconds is called V-1, V-1 where the sheet passes is called FR-4.
FR-5 is the addition of a board having flame resistance, but also has heat resistance (heat resistance), the physical properties such as high temperature, electrical resistance, and must be maintained at a certain size or more,specific reference LI1-1989.
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