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General fr4 Tg is 130-140 centigrade, moderate Tg is greater than 150-160 centigrade, High-Tg is greater than 170 degrees. The higher of Tg, the better performance of PCB heat resistance, moisture resistance, chemical resistance, stability and other characteristics. FR4 …
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Get Price2021-11-13u2002·u2002It does not absorb water, keeps high mechanical strength and has a good insulating capacity in dry or humid environments. Examples of FR-4. Standard FR4: as its name indicates, this is the standard FR-4 with heat resistance of the order of 140°C to 150°C. High TG FR4: this type of FR-4 has higher glass transition (TG) of around 180°C.
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A stainless-steel, high-pressure washing apparatus using deionized water is the best tool for removing residue from PCBs. Washing PCBs in deionized water poses no threat to the device. This is because it's the ions in regular water that do damage to a circuit, not the water itself.
Get PriceIPC-TM-650 2.6.7 Thermal Shock Testing. This test is based on similar methodologies as MIL-STD tests for thermal reliability. The upper temperature in the test is set to be below Tg of the laminate material. Specifically, IPC D coupons are specified to be subjected to thermal shocks ranging from -55 °C to the minimum of: Tg - 10 °C, reflow ...
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