Material Selection

LIP MATERIAL
Before selecting the right kind of sealing or lip material, it is extremely important to determine the type of environment, material selection and design recommendations in which the seal shall operate. See the below table.

Ratings

1	Very Good
2	Good for most application
3	Fair can be used if other material available but otherwise not recommended
4	Not recommended

Metal Case And Spring
Metal cases are used for general applications in oil or grease and are made of carbon steel. Besides this, it is also used in special applications such as sealing sea water for corrosive fluids for gases. For such purposes, it is of stainless steel construction. They are also available in other metal case like aluminum case, brass case based on customers' specific applications and requirements.

CASE
SAE. NO	AISI NO.	APPLICATION	COST
1008~1010	1008~1010	GENERAL	LOW
SAE 30304	304	SPECIAL CORROSION RESISTANCE	HIGH

SPRING
SAE. NO	AISI NO.	APPLICATION	COST
1070~1080	1070~1080	GENERAL	LOW
30304	304	SPECIAL CORROSION RESISTANCE	HIGH
C5210R	C5210	CORROSION & AGING RESISTANCE	HIGHER

Normally, piano wire is used in garter spring. Where corrosion resistance or extreme heat resistance is required on the part of the garter spring, stainless steel is used.

Shaft and Housing Recommendation

SHAFT

• Shaft Speed- An important factor in seal selection.
• Temperature- For extreme temperatures, special compounds can be used.
• Pressure- Where pressure above nominal press-fit, special seals should be used or pressure against sealing lip relieved.
• Grinding-Rotating Shaft: plunge grinding is recommended.
• Reciprocating Shaft: center less grinding is acceptable.
• Shaft Hardness-Normally seals contact area of the shaft should be rockwell C 45 minimum
• Shaft to Bore Misalignment: Fixed misalignment of center of shaft with
• Bore center concentrates wear at one side of the seal which becomes more severe as speed increases.
• Shaft -Run-out ( eccentricity or shaft whip ) should keep to absolute minimum creates difficult sealing problem.

Shaft Design Recommendation
The other major components of an oil seal are the metal case and garter spring.

SHAFT DIAMETER TOLERANCE up to 4.000 shaft .003 4.00 1 to 6.00 shaft .004 6.001 to 10.000 shaft .005

Pressure Limit Shaft speed-FPM Maximum Pressure-PSI 0-1000 7 1001-2000 5 2001 and Higher 3

Eccentricity Limits Speed Range Max Misalignment Max Shaft Run-out 0-800RPM 0.015 in ECC 0.025 in TIR 800-2200RPM 0.010 in ECC 0.020 in TIR 2200-4200RPM 0.010 in ECC 0.015 in TIR

Housing Bore
Our housing bores are recommended to be used in rubber covered and metal O.D seals for steel and cast iron, soft alloy, aluminum alloy, plastic or nylon.

BORE DESIGN RECOMMENDATION :

BORE CHAMFER : In order to assist installation of the seal, a bore chamber is necessary. The absence or improper installation of chamfer will distort seal case and would lead to more assembly force craving.

ROTARY SHAFT SEAL
We provide hundreds of different cross sectional shapes in rotary shaft seals. In order to serve our clients better, we search the available shapes and tooled sizes that suit well customers' requirements.

P.T.F.E SEALS AND ENGINEERED COMPONENTS

• MIM Plastics provides high volume, low cost P.T.F.E and P.T.F.E blend components of consistent quality as well as short run and prototype quantities. There are various production methods that are available with us and are adopted based on the component geometry, quantity, and material requirements. We have extensive experience in importing and supplying P.T.F.E compounds used as seals ( valve seals, lip seals , face seals, shaft seal elements).
• We possess an ever-increasing range of P.T.F.E blends that are used to either machine or mold any shape components you may need.