Glassware Catalog

1.78mm O-Rings - Sigma-Aldrich Glassware Catalog


1.78mm Wall  •  2.6mm Wall  •  3.5mm Wall  •  5.3mm Wall


Viton A linear copolymer of vinylidene fluoride and hexafluoro-propylene;
good chemical resistance
Silicone Elastomer with high-temperature and ozone resistance
FETFE Fluoroelastomer with TFE additives and high chemical resistance
CAPFE A resilient rubber core encapsulated in non-porous FEP

O-ring measurement
  1. Measure the i.d. and wall thickness (mm)
    of the existing O-ring.
  2. Locate a replacement in the tables that follow.
  3. Ace Glass part numbers are provided for convenience.

Wall 1.78mm

I.d. (mm)
Viton
Catalog Number
Ace #
Silicone
Catalog Number
Ace #
2.9
7855-01
7855-201
3.7
7855-02
7855-202
4.5
7855-04
7855-204
5.3
7855-07
7855-207
6.1
7855-05
7855-205
7.6
7855-06
7855-206
9.2
7855-08
7855-208
10.8
7855-10
7855-210
12.4
7855-12
7855-212
13.9
7855-13
7855-213
15.6
7855-14
7855-214
18.8
7855-15
7855-215
23.5
7855-19
7855-219
25.1
7855-17
7855-217

I.d. (mm)
FETFE
Catalog Number
Ace #
CAPFE
Catalog Number
Ace #
2.9
7855-701

-
3.7
7855-702
-
-
4.5
7855-704
-
-
5.3
7855-707
-
-
6.1
7855-705
7855-805
7.6
7855-706
7855-806
9.2
7855-708
7855-808
10.8
7855-710
7855-810
12.4
7855-712
-
-
13.9
7855-713
7855-813
15.6
7855-714
-
-
18.8
7855-715
7855-815
23.5
7855-719
7855-819
25.1
7855-717
7855-817


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