The retention of Hydraulic O-ring

Hydraulic O-ring attachment variant forms part of the sleeve crown. Sleeve crown retention and degree of polymerization of about coping, in order to achieve good retention of the restoration, crown generally determine the degree of polymerization between 4?-8?, often used in clinical 6?. Hydraulic O-ring can indeed make the sleeve crown retention improved. The current domestic economic situation limits repair in many places more use of non-precious metals. Rather than linear shrinkage precious metal casting, causing a retention effect telescopic crown affected. The test showed the same degree of polymerization, including the crown, using hydraulic retention O-ring is significantly higher than the case of hydraulic O-ring is not used. When the crown degree of polymerization of O-ring 15 ?, its retention and 6 ?when not in use hydraulic retention O-ring quite right and left about 5 Newtons, such as the use of non-precious metal repair, hydraulic O-ring can compensate for the lack of use due to its retention leads to casting contraction, suggesting that O-ring hydraulic attachment suitable for the production of non-precious metal sleeve crown.

In the situation that compression ratio is fixed, if the OD is large , the deformation must be little. Using large OD rubber o ring can be given stable sealing performance. As moving sealing, large OD o ring can be twist resistance. The hardness of material mechanical always be expressed with shore A, Generally, it’s 70~75 shore A.; You should choose right hardness degree when it’s in high pressure, such as 80 degrees, 85 degrees , or 90 degrees. Pressure resistance performance of rubber hydraulic o ring should be depended on the relationship between material mechanical hardness and clearance.

When the pressure is very high, it should be used with shield ring. Shield ring has two kinds, ring type and oblique incision type. Ring type is better in using effect.

Models of rubber hydraulic o ring: Up to tens of thousands of species. So, I don’ t show them all. Standard is ID*CS. If you want to know which size of o ring you need, please feel free to contact us, we will reply you frankly. Standard and non-standard are in our sealing range, we always have a number of stock, welcome to you.