Heat shrinkable tubes have many uses, but many users don’t know much about the flame retardant grade of heat shrinkable tubes. Many comrades only like to look at the conclusion and not the process. So first of all, let me tell you that the flame retardant grade of heat shrink tubing is VW-1. This flame retardant grade only applies to flame retardant heat shrink tubing.

What is VW-1 flame retardant grade? The VW-1 flame retardant rating is the wire burning test method in UL1581.

    VW-1 uses a vertical combustion test, with the heat shrink tube port positioned to align with the flame; the qualification standards are that the residual flame should not exceed 60 seconds, and the surgical cotton padded at the bottom cannot be ignited by falling objects. Flame retardant heat shrinkable tubing does not mean that it will not burn, but that it will extinguish itself at the specified time after leaving the flame, thereby achieving the flame retardant effect.

    The VW-1 flame retardant grade is suitable for wire testing and is very strict. Because heat shrink tubes are often used with wires, they also need to reach the VW-1 flame retardant grade. Therefore, the flame retardant grade of heat shrink tubes is still very strict. High.

    Heat shrinkable tubes are divided into two types: flame retardant and non-flame retardant, so you need to pay extra attention when purchasing heat shrinkable tubes. Transparent PE materials cannot produce flame-retardant heat shrinkable tubes because flame retardants are generally colored. Once flame retardants are added, the transparent effect cannot be achieved.

The simplest way to test flame-retardant heat shrink tubing is to directly burn it with fire, and then time it. If it can be extinguished within 60 seconds, it is a qualified flame-retardant heat shrink tubing. Although it is simple and crude, it is effective. This is also a test to determine whether it is a flame-retardant heat shrink tubing. The most effective and fastest way to burn heat shrink tubing.