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UL certifies PCBs under a PCB Recognition Program that comes in two flavors – Full Recognition and Flame-Only Recognition.

Flame Ratings

Flame ratings are typically specified by end product requirements and evaluate a sample burn time when a PCB is subjected to a horizontal and vertical flame. These flames are broken down into classes which includes V-0, V-1, V2, VTM-0, VTM-1, and VTM-2.

Solder Limits

Solder limits test the kind of soldering processes that a PCB will be subjected to during the component assembly process. These tests simulate a thermal shock and maximum temperature to gauge how your PCB performs.

Maximum Operating Temperature

Maximum Operating Temperature (MOT) defines a PCBs maximum continuous use at a specific temperature. This test simulates the exposure of a PCB to normal operating condition temperatures during a 10-56 day period, with temperatures based on your manufacturer’s guidelines.

Direct Support Request

Direct Support Request (DSR) measures the performance of a PCB laminate when in contact with 120V or less. This test is only performed on laminates rather than the whole PCB, and each laminate receives a DSR compliant rating. During this testing, a laminate will undergo several performance tests, including:

·Dielectric strength

·High current arc ignition

·Hot wire ignition

·Volume resistivity

·Heat deflection

Why UL certification is important?

UL is the only organization that publishes PCB safety standards. UL certification can demonstrate the PCB products have been passed the product safety benchmark.  And the UL recognized PCBs could be used globally.

It is well known that UL recognized PCB components and materials had passed the industry’ s most stringent safety tests and follow-up program. With UL certification on the PCBs, PCB manufacturers can assure customers that the boards they get a match or exceed industry standards for preventing the electric shock or fire. It has been certified for safe use and follows specific standards and guidelines during development and construction.

If PCB manufacturers produce PCBs for industries that do not have UL certifications, manufacturers may not need to certify the boards. But, many end products now also require PCBs to meet UL standards, such as audio and video equipment, medical equipment, and industrial control equipment, etc. In any case, if the boards are officially certified according to industry safety standards, PCB manufacturers will be more attractive than the competitors.

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