What is the flame retardant grade of twisted pair mesh cable?

　　The flame retardant grade of twisted pair cable can vary according to different standards and application scenarios. The following is a specific analysis of the flame retardant grade of twisted pair cable:

　　Common fire retardant grades

　　National standard (GB) flame retardant grade:

　　Class B1: refractory materials (products). This is the classification of material combustion security performance in domestic standards. Class B1 materials have lower combustion rate and flame spread rate during combustion.

　　UL (American Underwriters Testing Institute) flame retardant grade:

　　CM grade: This is the most commonly used twisted pair flame retardant grade, and the test standard is UL. 1581. CM-grade network cables do not spontaneously ignite and spread very slowly in the flame. When the external fire source is cut off, the flame on the cable will gradually extinguish. However, CM-grade network cables may emit SMoke and appear when burning, regardless of smoke density and toxicity.

　　CMR grade: CMR grade network cable belongs to high flame retardant grade, and the test standard is UL. 1666. It is mainly used in the vertical trunk part of the room, because when the cable is placed vertically, the direction of the cable is consistent with the direction of the flame, and the fire that may be caused is relatively large, so a high flame retardant grade cable is required.

　　CMP grade: CMP grade network cable is the highest flame retardant grade network cable, and the test standard is UL 910. It is mainly used for cables in horizontal subsystems that are directly applied in ventilated or forced ventilation environments without metal pipelines. CMP grade cable has a high decomposition temperature and a high ignition point, which has better fire resistance. However, once the CMP material burns, it releases colorless, odorless but more toxic fluorine gas.

　　Second, the flame retardant grade of specific types of twisted pair cable

　　Super Category 5 twisted pair: The flame retardant rating of Super Category 5 twisted pair (such as UTP-5E - four pairs of flame retardant) generally meets the UL94V-0 rating. This indicates that the material has a lower burn rate and flame spread rate in the combustion test.

　　III. The relationship between flame retardant grades and materials

　　The flame retardant grade of twisted pair cable is closely related to the material used. For example, the sheath layer of CM-grade cable is mostly PVC material, and the insulating layer is high-density PE material; while the sheath layer of CMP-grade cable is made of fluorine material (such as PTFE or FEP), which has a higher decomposition temperature and ignition point, thus providing better fire protection performance.

　　IV. Selection of application scenarios and flame retardant grades

　　When selecting the flame retardant grade of twisted pair cable, it is necessary to consider its application scenarios and safety requirements. For example, in places that require higher security (such as data centers, hospitals, etc.), a network cable with a higher flame retardant grade (such as CMP or CMR grade) should be selected; while in general offices or home networks, CM-grade network cables are usually sufficient to meet the needs.

　　In summary, the flame retardant grade of twisted pair cable varies depending on the standard and application scenario. When selecting, the appropriate flame retardant grade should be determined according to specific needs and safety requirements.