How to identify the merits of the spiral protective sleeve ?

1 surface appearance
Plastic protective sleeve surface smooth, no lack of material , cracks, damage , burrs , no blistering and uneven ,truck security seals no impurities, variegated and other phenomena was of high quality ; contrary, was of poor quality , substandard .
2 Hardness
Qualified quality spiral protective cover hardness is generally 85-90 degrees Shore hardness is below 85 degrees or above 90 degrees do not meet the requirements. Hardness is too low , you can not play the internal product protection , binding effect ; excessive hardness , when used at low temperatures , protective sleeve prone to embrittlement, 1% to 5 % of the products can not meet the requirements, the spiral protective sleeve the protective effect of internal product is greatly reduced.
3 . Resistance to high temperature
Qualified quality spiral protective cover should have good resistance to high temperature performance. Identification of the user using the following method : turn the screw placed under protective cover 80 ℃ ambient 1 hour , 0.5 hours under room temperature under -40 ℃ environment for 1 hour at room temperature environment 0.5 hours , do it five cycles. Observation, if the spiral protective cover without cracking, sticky, depression occurred, compared with high-quality ; Conversely, if the spiral protective cover cracking , deformation, etc. One sticky or depression phenomena , the protective sleeve is inferior , not qualified.
 4 oil resistance
Qualified quality spiral protective sleeve has good oil resistance. The protective sleeve can be soaked in a mixture of the coil 70 # gasoline and 10 percent toluene for 5 minutes , without discoloration phenomenon tacky compared to high- pass ; contrary, discolored , sticky phenomenon , the protective sleeve is poor , failed.
 5. Wear
Qualified quality spiral protective sleeve has good wear resistance.
 6 tensile strength , impact strength
High- pass coil protection cover has good tensile strength and impact strength, tensile strength at room temperature is generally 25-30Mpa; generally impact strength ( notched ) at room temperature was 35KJ/M2, -40 ℃ / 24h to 5KJ / M, impact strength ( unnotched ) fixed length plastic strap seal, continuously.
 7 anti-UV
Spiral protective sleeve has good UV resistance . Protective sleeve black spiral columns must be better than carbon black production , to enhance UV resistance spiral protective sleeve .
8. Antistatic
Spiral protective sleeve is mainly used excavators, loaders, rollers pavers , forklifts , cranes, pumping machinery , outside the protection of cables and other construction machinery and injection molding machine equipment . Underground, dry environment when the job should be considered a strong choice spiral antistatic protective sleeve . Antistatic properties to enhance the internal hydraulic pipe fittings and other products , in a variety of harsh environments of the hydraulic tube play better security role !