What is UL flame retardant label?
The UL flame retardant label refers to a safety certification mark obtained by a product after passing UL (Underwriters Laboratories) flame retardant testing. This symbol represents that the product has passed UL's rigorous safety assessment and meets UL's flame retardant performance standards. As a globally renowned safety certification body, UL's flame retardant label is widely recognized as an authoritative symbol of product quality and safety.
Specifically, the UL flame retardant label indicates that the product material has certain flame retardant properties under specific testing conditions, that is, the material can quickly extinguish after being ignited and will not continue to burn or cause a fire. This is crucial for many industries such as construction, electronics, automotive, medical equipment, etc., as their products may come into contact with sources of fire during use, and therefore must have certain flame retardant properties to ensure safe use.
Standard for UL flame retardant labels
The UL flame retardant label standard is a series of testing standards for material flame retardancy developed by Underwriters Laboratories (UL) in the United States. These standards typically include various testing methods such as vertical combustion testing, horizontal combustion testing, and ultimate oxygen index testing to evaluate the flame retardant performance of materials under different conditions.
Specifically, the standards for UL flame retardant labels may involve the following aspects:
Vertical combustion test: a testing method for evaluating the combustion performance of materials when placed vertically, by observing indicators such as the combustion speed and flame spread length of the sample to assess the flame retardancy of the material.
Horizontal combustion test: a testing method for evaluating the combustion performance of materials when placed horizontally, which also evaluates the flame retardancy of materials by observing indicators such as the combustion speed and flame spread length of the sample.
Extreme Oxygen Index Test: A test method for evaluating the minimum oxygen concentration required for a material to maintain combustion at a specific oxygen concentration, used to determine the flame retardant performance level of the material.
It should be noted that the standards for UL flame retardant labels are not static. With the development of technology and the improvement of safety standards, UL will continuously update and improve its flame retardant testing standards. Therefore, in specific applications, it is necessary to refer to the latest UL flame retardant testing standards to evaluate the flame retardant performance of the product.
UL94 flame retardant rating classification
UL94 is currently the most widely used flame retardant performance evaluation standard for plastic materials internationally, with a total of 12 grades: HB V-0、V-1、V-2、5VA、5VB、VTM-0、VTM-1、VTM-2、HBF、HF-1、HF-2。
VTM-0, VTM-1, and VTM-2 are suitable for plastic films, while HBF, HF1, and HF2 are suitable for foam materials.
The equivalent flame retardant rating standard adopted by China is GBT2408 "Horizontal and Vertical Methods for Testing the Burning Behavior of Plastics".
The flame retardant grade of plastics increases gradually from HB to V-0: HB<V-2<V-1<V-0<5VB<5VA.
UL94 Common Test Methods
UL94 is used to evaluate the ability of materials to extinguish flames after being ignited. There are multiple evaluation methods based on combustion speed, combustion time, anti drip ability, and whether the drips are burning.
UL flame retardant label
With the development of society, the volume and structure of electronic products produced are becoming smaller and more complex. The probability of fire caused by high temperature will greatly increase. In the electronics industry, flame-retardant edge labels for lithium batteries can greatly reduce the risk of battery leakage and increase the safety of battery use. The application of flame-retardant labels in the electronics industry is already very mature. In fact, flame-retardant labels are also widely used in other industries.
In the automotive industry, fire-resistant and flame-retardant labels are also widely used in various components. Every summer, there are always reports of cars catching fire due to high temperatures, leaving only an iron frame burned down. Therefore, for parts that are prone to catching fire in cars, fire prevention measures must be taken. The battery, motor, engine, wiring harness and other parts of the car will use fire-resistant and flame-retardant label materials instead of using labels made of other materials. Do you know the reason for this?
The fire-resistant and flame-retardant labels are made of PET material, which is a polymer material. It has good hardness and brittleness, can withstand certain high temperatures, resist harsh environments, and resist corrosion from chemicals such as acid and alkali. It is suitable for making various durability labels.
Due to the special properties of PET materials, such label products are also applied in many other fields, such as industrial and automation equipment, wind and photovoltaic wiring harnesses, medical equipment, aerospace, electronic communication, and so on.
