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Bell Jar Gaskets & Seals

Bell Jar Gaskets & Seals

Custom Gasket Mfg. is a recognized leading manufacturer and supplier of high quality bell jar gaskets and seals.  Our company’s reputation for excellence has been built on our ability to provide our valued customers with the most effective designing, engineering and manufacturing solutions to meet their most demanding applications. Our main objective is to continuously exceed our customer’s expectations by providing them with high performance gaskets and sealing products, competitive pricing, on-time delivery and exceptional customer service.  Custom Gasket Mfg. maintains a modern manufacturing facility along with knowledgeable, technically-oriented professionals enabling us to consistently meet all of your blueprint specifications and tolerance requirements.

bell jar seals

Custom Gasket Mfg. has over forty years experience specializing in the manufacturing of precision molded rubber products, including bell jar gaskets and seals.  We take pride in our ability to consistently produce high quality molded rubber products guaranteed to meet your most stringent requirements and function perfectly within their application.  We provide full production capabilities from prototype and short run quantities through large production runs.  Custom Gasket Mfg. offers (and inventories) all common, standard size bell jar gaskets ranging from 4" to 18" in diameter.  The rubber molding tolerances for bell jar gaskets are complaint with rubber molding industry standard RMA A2 Precision tolerances.

bell jar

Pyrex Bell Jar L-Gaskets are designed to fit over the outer surface of a Pyrex chamber.Bell jar and cylinder gaskets have an "L-shape" cross-section.  The bell jar sits inside the riser of the "L" and creates a vacuum-tight seal.  Custom Gasket Mfg. fabricates bell jar gaskets in a wide range of materials, including (but not limited to): Nitrile (Buna-N, NBR), Silicone (VMQ), Neoprene® (CR), Ethylene-Propylene (EPDM) and Viton® (FKM).  Custom Gasket Mfg. works directly from your blueprints in order to provide you with the most accurate product with precision tolerance.  This ensures that your bell jar gasket will meet and exceed your expectations.

Bell Jar Gaskets Size Chart

Size/Dash

Jar OD

Jar Base Flange OD

Gasket ID

Dim A

Dim B

T1 Dim

T2 Dim

4
4F

4
4.5

None
None

3.750
4.125

0.500
0.500

0.375
0.375

0.075
0.075

0.075
0.075

5

5

None

4.750

0.500

0.375

0.103

0.075

6
6F

6
5.5

None
6.25 Nominal

5.570
5.570

0.500
0.500

0.375
0.375

0.103
0.103

0.075
0.075

7
7AF
7F

7
6.5
7

None
7.25
7.5

6.750
6.750
6.750

0.500
0.500
0.500

0.375
0.375
0.375

0.103
0.103
0.103

0.075
0.075
0.075

8
8F

8.25
8.75

None
9 Nominal

7.750
7.750

0.500
0.500

0.375
0.375

0.103
0.103

0.075
0.075

9F

8.75

9.5 Nominal

8.750

0.500

0.375

0.103

0.075

10

10.25

None

9.25

0.750

0.500

0.125

0.094

12
12F

12.5
12

None
13 Nominal

11.500
12.250

0.075
0.500

0.500
0.375

0.125
0.103

0.094
0.075

14

14.25

None

13.125

1.000

0.500

0.125

0.094

15
15F

15.375
15.375

None
16.5 Nominal

14.500
15.500

1.000
0.500

0.500
0.375

0.125
0.103

0.094
0.075

18
18A

18
18

None
None

17.250
17.250

1.125
0.075

0.625
0.375

0.125
0.094

0.094
0.075

19F

18

19 Nominal

18.125

0.500

0.375

0.103

0.075

20

19

None

18.125

1.125

0.750

0.125

0.094

22

22

None

21.375

1.125

0.625

0.125

0.094

24

24

None

23.625

1.000

0.750

0.187

0.125

Pyrex Bell Jar L-Gaskets

Please visit our gasket materials page for more information on our extensive selection of materials.

For more information on bell jars gaskets and seals or to speak with one of our knowledgeable professionals, please feel free to Contact Us or complete our online Request For Quote form.

Call 800-985-6750 or email your inquiry to sales@customgasketmfg.com