EPDM Ring Gasket
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EPDM Ring Gasket

Ring gaskets are a flat sealing element, consisting of an inner and outer diameter sized to fit a flange's bore and bolt circle. Ring gaskets sit inside the flange's bolt circle. ASME B16.21 and ASME B16.47 govern the dimensions of ring gaskets for standard and large diameter pipe flanges. EPDM, Ethylene Propylene Diene Monomer, is an "M" class synthetic rubber elastomer. Relatively immune to sunlight, water and low temperatures, EPDM is often a smart choice for gaskets that will be outside. Good compression set resistance means it recovers well in applications where a joint may open up from time to time, and high electrical resistance means EPDM gaskets may be appropriate for some electrical installations.

Governing StandardsEPDM Ring Gasket

ASME B16.21 Covers types, sizes, materials, dimensions, tolerances, and markings for nonmetallic flat gaskets.
ASME B16.47 Covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60. Included are flanges with rating class designations 75, 150, 300, 400, 600, and 900 with requirements given in both SI (Metric) and U. S. Customary units, with diameter of bolts and flange bolt hole expressed in inch units.

Physical PropertiesEPDM Ring Gasket

Typical Physical Properties:
Dimension 1/8"
Hardness (shore A) 65
Density (g/cm3) 1.40
Tensile Strength (mpa) 4.50
Elongation (%) 300
Temperature -4F to 284F (-20C to 140C)

Dimensional SpecificationsEPDM Ring Gasket

Per ASME B16.21-2016
  Pipe Diameter
1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 3 1/2 4 5 6 8 10 12 14 16 18 20 24
Inside Diameter 0.84 1.06 1.31 1.66 2.38 2.38 2.88 3.50 4.00 4.50 5.56 6.63 8.63 10.75 12.75 14.00 16.00 18.00 20.00 24.00
Outside
Diameter
per Class
150# 1.88 2.25 2.62 3.00 3.38 4.12 4.88 5.38 6.38 6.88 7.75 8.75 11.00 13.38 16.13 17.75 20.25 21.62 23.88 28.25
300# 2.12 2.62 2.88 3.25 3.75 4.38 5.12 5.88 6.50 7.12 8.50 9.88 12.12 14.25 16.62 19.12 21.25 23.50 25.75 30.50
600# 2.12 2.62 2.88 3.25 3.75 4.38 5.12 5.88 6.38 7.62 9.50 10.50 12.62 15.75 18.00 19.38 22.25 24.12 26.88 31.12
Per ASME B16.47-2017
Series A Pipe Diameter
26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60
Inside Diameter 26.00 28.00 30.00 32.00 34.00 36.00 38.00 40.00 42.00 44.00 46.00 48.00 50.00 52.00 54.00 56.00 58.00 60.00
Outside
Diameter
per Class
150# 30.50 32.75 34.75 37.00 39.00 41.25 43.75 45.75 48.00 50.25 52.25 54.50 56.50 58.75 61.00 63.25 65.50 67.50
300# 32.88 35.38 37.50 39.62 41.62 44.00 41.50 43.88 45.88 48.00 50.12 52.12 54.25 56.25 58.75 60.75 62.75 64.75
600# 34.12 36.00 38.25 40.25 42.25 44.50 43.50 45.50 48.00 50.00 52.26 54.75 57.00 59.00 61.25 63.50 65.50 67.75
Per ASME B16.47-2017
Series B Pipe Diameter
26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60
Inside Diameter 26.00 28.00 30.00 32.00 34.00 36.00 38.00 40.00 42.00 44.00 46.00 48.00 50.00 52.00 54.00 56.00 58.00 60.00
Outside
Diameter
per Class
150# 28.56 30.56 32.56 34.69 36.81 38.88 41.12 43.12 45.12 47.12 49.44 51.44 53.44 55.44 57.62 59.62 62.19 64.19
300# 30.38 32.50 34.88 37.00 39.12 41.25 43.25 45.25 47.25 49.25 51.88 53.88 55.88 57.88 61.25 62.75 65.19 67.12
600# 30.12 32.25 34.62 36.75 39.25 41.25                        
  1. All dimensions are in inches.
EPDM Ring Gasket
View
Pipe Diameter Flange Rating Series Thickness Item # Availability Price Quantity UOM
1/2 150# - 1/8 GREPDM-1500050-1/8 1-3 Working Days $0.20076/EA EA
1/2 300#, 400#, 600# - 1/8 GREPDM-3460050-1/8 1-3 Working Days $0.25786/EA EA
3/4 150# - 1/8 GREPDM-1500075-1/8 1-3 Working Days $0.28909/EA EA
3/4 300#, 400#, 600# - 1/8 GREPDM-3460075-1/8 1-3 Working Days $0.39348/EA EA
1 150# - 1/8 GREPDM-1500100-1/8 1-3 Working Days $0.39348/EA EA
1 300#, 400#, 600# - 1/8 GREPDM-3460100-1/8 1-3 Working Days $0.472/EA EA
1 1/4 150# - 1/8 GREPDM-1500125-1/8 1-3 Working Days $0.51394/EA EA
1 1/4 300#, 400#, 600# - 1/8 GREPDM-3460125-1/8 1-3 Working Days $0.60316/EA EA
1 1/2 150# - 1/8 GREPDM-1500150-1/8 1-3 Working Days $0.65045/EA EA
1 1/2 300#, 400#, 600# - 1/8 GREPDM-3460150-1/8 1-3 Working Days $0.80303/EA EA
2 150# - 1/8 GREPDM-1500200-1/8 In Stock $0.97166/EA EA
2 300#, 400#, 600# - 1/8 GREPDM-3460200-1/8 1-3 Working Days $1.09301/EA EA
2 1/2 150# - 1/8 GREPDM-1500250-1/8 1-3 Working Days $1.35711/EA EA
2 1/2 300#, 400#, 600# - 1/8 GREPDM-3460250-1/8 1-3 Working Days $1.49987/EA EA
3 150# - 1/8 GREPDM-1500300-1/8 1-3 Working Days $0.95025/EA EA
3 300#, 400#, 600# - 1/8 GREPDM-3460300-1/8 1-3 Working Days $1.27146/EA EA
3 1/2 150# - 1/8 GREPDM-1500350-1/8 1-3 Working Days $1.40708/EA EA
4 150# - 1/8 GREPDM-1500400-1/8 1-3 Working Days $1.5427/EA EA
4 300# - 1/8 GREPDM-3000400-1/8 1-3 Working Days $1.74257/EA EA
5 150# - 1/8 GREPDM-1500500-1/8 1-3 Working Days $1.66293/EA EA
5 300# - 1/8 GREPDM-3000500-1/8 1-3 Working Days $2.35889/EA EA
6 150# - 1/8 GREPDM-1500600-1/8 1-3 Working Days $1.8657/EA EA
6 300# - 1/8 GREPDM-3000600-1/8 1-3 Working Days $3.06221/EA EA
8 150# - 1/8 GREPDM-1500800-1/8 1-3 Working Days $2.66158/EA EA
8 300# - 1/8 GREPDM-3000800-1/8 1-3 Working Days $4.14718/EA EA
10 150# - 1/8 GREPDM-1501000-1/8 1-3 Working Days $3.61629/EA EA
10 300# - 1/8 GREPDM-3001000-1/8 1-3 Working Days $4.9966/EA EA
12 150# - 1/8 GREPDM-1501200-1/8 1-3 Working Days $5.56497/EA EA
12 300# - 1/8 GREPDM-3001200-1/8 1-3 Working Days $6.50005/EA EA
14 150# - 1/8 GREPDM-1501400-1/8 1-3 Working Days $6.79895/EA EA
14 300# - 1/8 GREPDM-3001400-1/8 1-3 Working Days $9.69431/EA EA
16 150# - 1/8 GREPDM-1501600-1/8 1-3 Working Days $8.79759/EA EA
16 300# - 1/8 GREPDM-3001600-1/8 1-3 Working Days $11.16741/EA EA
18 150# - 1/8 GREPDM-1501800-1/8 1-3 Working Days $8.20246/EA EA
18 300# - 1/8 GREPDM-3001800-1/8 1-3 Working Days $13.034/EA EA
20 150# - 1/8 GREPDM-1502000-1/8 1-3 Working Days $9.70858/EA EA
20 300# - 1/8 GREPDM-3002000-1/8 1-3 Working Days $15.02194/EA EA
24 150# - 1/8 GREPDM-1502400-1/8 1-3 Working Days $12.68067/EA EA
24 300# - 1/8 GREPDM-3002400-1/8 1-3 Working Days $20.22911/EA EA