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M&Y and ROTT Factors

GRI™ has local fabricating distribution partners assuring that our end user customers receive the very best value in the fluid sealing industry on time every time.

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The M and Y values are for flange design only and are not meant to be used as gasket seating stress values in actual service. These values are used in formulas in the ASME Boiler and Pressure Vessel Code Division 1, Section VIII, Appendix 2 to give an SM1 or SM2 value based on either gasket seating or the internal pressure.

These values do not take fugitive emissions into account and therefore newer gasket constants, Gb, a, and Gs, based on leakage, were developed to take this into account.

Durlon® Style Thickness m y Gb a Gs
5X00 Series 1/16" 1.5 1855 474 0.256 48
5X00 Series 1/8" 2.5 2619 902 0.253 4
7000 Series 1/16" 3 3347 497 0.226 3
7000 Series 1/8" 3.2 3385 486 0.276 0.4
7760 (DuraSwell) 1/16" 6.9 2412 95 0.609 0.4
7910 1/16" 1.5 2416 502 0.289 0.001
7910 1/8" 1.5 3576 736 0.237 9.1
8300 1/16" 3.7 3515 512 0.355 13
8300 1/8" 3 4014 460 0.313 0.427
8400 1/16" 2.9 2410 380 0.311 0.01
8400 1/8" 4.5 3967 391 0.321 0.014
8500 1/32"     410 0.25 190
8500 1/16" 2.7 2359 650 0.33 200
8500 1/8" 4.2 2931 400 0.35 20
8600 1/16" 2.9 2540 343 0.325 0.3
8600 1/8"     866 0.273 37
8700 1/16" 3.1 3127 546 0.455 12
8700 1/8" 5 4000 758 0.34 0.01
8900 1/16" 4.8 4851 915 0.428 0.02
8900 1/8" 7.3 3730 567 0.556 0.26
9000 1/16" 2.2 1937 639 0.22 55
9000 1/8" 4.6 1639 495 0.262 65
9200W 1/16" 1.5 952 153 0.36 15
9200W 1/8" 4.2 827 96 0.437 14
9400 1/16" 6.8 2765 1701 0.173 99
9400 1/8"     1412 0.164 248
9600 1/16"     1200 0.2 3.5
9600 1/8"     1400 0.19 1.5
9600 w/ DurCore 1/8" 1.5 833 204 0.316 1.00E-07
FGS95 1/16"     970 0.038 1
FGS95 1/8"     970 0.038 1
FGL316 1/16"     816 0.38 1
FGL316 1/8"     816 0.38 1
FGT316 1/16"     1400 0.33 1
FGT316 1/8"     1400 0.33 1
FGM316 1/8" 2.5 4000      
CFG 3/32"     557 0.325 2.21
DURTEC (FG) 1/8" 1.5 833 187 0.467 0.5
DURTEC (ePTFE) 1/8" 1.5 833 204 0.316 1.00E-07
SWG/FG 0.175" 2.8 6500 86 0.594 0.1
SWG/Mica-FG 0.175" 2.8 6500 90 0.59 0.1
SWG/PTFE 0.175" 2.8 6500 173 0.405 1
KAMMPROFILE 1/8" 4 1000 368 0.4 0.28
ETG-HT1000™ 1/16”          
ETG-SWG 0.175" 2.8 6500 90 0.59 0.1
ETG-DURTEC 1/8" 1.5 833 187 0.467 0.5
ETG-KAMMPROFILE 1/8" 4 1000 368 0.4 0.28