What is the difference between standard SC and SI cylinder cylinder

A new generation of standard what is the difference between SC and SI cylinder cylinder. Cylinder and parts, zhengzhou to fly the Wolf to introduce you to SC cylinder and what is the difference between SI and SU cylinder cylinder? SC product features: free of lubrication ( Using oil-retaining bearing, the piston rod without lubrication) Buffer ( Except with a fixed buffer cylinder end with adjustable cushion, make no impact on the smooth cylinder when reversing. High temperature resistance, Can use high temperature resistant seal material, make the normal working cylinder under the condition of high temperature in degrees Celsius) Cylinder ( ) , SI cylinder welding torch and the body insulation cylinder piston rod position is adjustable, taking turns, but also can prevent the cylinder piston rod head with Morse taper hole, for easier installation of welding torch, welding torch compression strength, single cylinder is twice the size of the output power can guarantee the quality of welding process.