A brief description of the O-ring:
The O-ring is a rubber ring with a circular interface and is the most widely used seal in liquid pneumatics.

O-ring features
1: small size is easy to assemble and disassemble
2: Both static and dynamic seals are available
3: Static seal has almost no leakage
4: One-piece use two-way seal
5: low dynamic friction
6: low price

O-ring sealing principle:
The O-ring seal is an extruded seal. When the seal produces initial deformation and stress Pseal, Pw>Pseal,
Will not leak.
Pm=Po+Pp, Pp=KxPo Pm=Po+KxP
K is the coefficient of pressure transmitted to the O-ring by the medium pressure (for rubber, K=1; for seamless steel pipe? Composite seal?)
Therefore, as long as the O-ring has an initial pressure, a leak-free absolute seal can be achieved. The O-ring seal is a self-sealing structure.

At the beginning of the O-ring mold design, first know it the application environment, material, shrinkage rate and other information of the O-ring, in order to accurately select the material, design the mold image of the O-ring

O-ring hardness:
Generally 30-90 Shore hardness, static seal selects low value 70SH, rotary seal takes high value 80
Very few use 30-60 or 90 shore A

Melon Rubber, as different o-rings sizes manufacturer, is one professional silicone o rings mould supplier( including clear silicone o-rings, white o-rings).

welcome ODM&ODM inquiry. and there is more than 1000 existing o-ring mould.