Does anyone know what the UL94 rating is for flammability?

Flame resistance classification: A plate-shaped specimen with a length of about 127 mm and a width and thickness of one end is kept horizontal, and one end is in contact with the flame for 20 seconds, then removed and measured until the flame disappears, and if it is not extinguished for more than 180 seconds, it is considered flammable. After the flame disappears, the burning length of the specimen is measured, and the length is less than 25mm

30 seconds 94V-0 --- vertical burning method, average 5mm, maximum not more than 10 seconds, brilliance disappears, falling objects within 30 seconds can not make cotton catch fire 94V-1--- vertical burning method, average 25 seconds, maximum no more than 30 seconds, brilliance disappears, falling objects within 60 seconds can not make cotton catch fire 94V-2 ---vertical burning method, average 25 seconds, maximum no more than 30 seconds, brilliance disappears, falling objects within 60 seconds can make cotton catch fire.

UL94 is a "Plastic Material Flame Test Standard" and not a grade.

UL94 Plastic Material Flame Test Standard Name:

ul 94: test for flammability of plastic materials for parts in devices and appliances

UL94 Plastic Material Burning Test Scope of application:

The final qualification of a flammability test material for plastic parts of equipment and appliances to which this standard applies depends on its use in the overall equipment and is consistent with the standard applicable to the equipment.

This requirement can be applied to other non-metallic materials; However, the methods described in this standard include standard-size samples and are used only to measure and illustrate the flammability of materials used in equipment and appliances relative to heat and flame in a controlled laboratory environment.

The flammability UL94 rating is the most widely used standard for the flammability performance of plastic materials. It is used to evaluate the ability of a material to extinguish after being ignited. There are several ways to judge whether the beads are burning or not, depending on the combustion rate, burning time, drip resistance, and whether the beads are burning.

Many values can be obtained for each material to be measured, depending on color or thickness. When the material of a product is selected, its UL rating should meet the thickness requirements of the wall section of the plastic part. The UL rating should be reported along with the thickness value, it is not enough to report the UL rating without the thickness.

UL94 materials are UL certified for combustion grade testing, which is the American standard, the national standard is generally GB T, the European standard is EN, the British standard is BS, Germany is DIN and so on! The UL94 combustion level generally has V0, V1, V2, HB!Among them, the HB grade is the lowest.

The national standards are all standards starting with GB.

UL94 is the American standard for combustion performance.

How can this be a national standard? Don't you see the UL letter in front of 94, UL is the certification standard in the United States.

1. The order of flame retardant grade is: 5VA>5VB> V-0>V-1>V-2>HB.

2. Flame retardant grade, that is, the property of the substance or the material after treatment that obviously delays the spread of the flame, and is divided into a hierarchy based on this.

3. The flame retardant grade of plastic is increased from HB, V-2, V-1 to V-0

1. HB: the lowest flame retardant grade in UL94 standard. Requires a burning rate of less than 40 mm per minute for samples between 3 and 13 mm thick; Samples less than 3 mm thick with a combustion rate of less than 70 mm per minute; Or extinguish in front of a 100mm sign.

2. V-2: After two 10-second combustion tests on the sample, the flame is extinguished within 60 seconds. Incendiary objects can fall.

3. V-1: After two 10-second combustion tests on the sample, the flame is extinguished within 60 seconds. No incendiary material can be dropped.

4. V-0: After two 10-second combustion tests on the sample, the flame is extinguished within 30 seconds. No incendiary material can be dropped.

You first uninstall the driver where it was installed, and then restart the computer, and the computer will prompt you to reinstall, and then you can do it.

UL94 involves flame retardant grades of 5VA, 5VB, V-0, V-1, V-2, HB, etc.

The order of flame retardant grades is: 5VA>5VB> V-0>V-1>V-2>HB

Hello. UL94 and B1, B2 are not the same system, you are mistaken.

UL94 is a plastic standard, and the flame retardant grade is divided into HB, V0, V1, V V and other grades.

B1 and B2 are the flame retardant grades of building materials and their products (generally divided into A1, A2, B1, B2, B3).

The flame retardant level of UL94 needs to be tested by the M607 horizontal and vertical combustion testing machine, which is mainly judged by the afterflame combustion time and afterglow combustion time.

B1 and B2 levels mainly need Z801 building materials smoke density tester, Z803 building materials flammability tester, and M6060B oxygen index tester to test. It is mainly judged by the smoke density grade, maximum smoke density, combustion length, and oxygen index.

If you still don't understand, you can contact Qingdao Shanfang, they specialize in UL94, B1, B2 and other flame retardant level testing instruments.

I really don't know about this resistor.