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Aramid with NBR Rubber Binder

7900/7925/7950 Aramid/NBR

COMPRESSED SHEET GASKET MATERIAL

ASTM F104: F712120-A9B3E22K5L151M5
Economy_Sheet-208622-edited-281861-edited.png

APPLICATION:

An economy grade general service compressed sheet with NBR rubber binder for mild service in piping and equipment and OEM applications in steam, hydrocarbons and refrigerants. An economical alternative when service ranges and applications are not severe.

COMPOSITION:

Durlon® 7900, 7925 and 7950 contain high-strength aramid fibers bonded with high-grade Nitrile (NBR) rubber.

ANTI-STICK PROPERTIES:

Much effort has gone into improving the anti-stick release agents of all compressed Durlon® products. All Durlon® compressed gasket materials have passed the MIL-G-24696B Navy Adhesion Test (366°F/48 hrs).

typical properties:

Color: Style 7900 - Off-White, branded
Style 7925 - Green, branded
Style 7950 - Blue, branded
Fiber: Aramid
Binder: Nitrile (NBR)
Fluid Services: Steam, Water, Inert Gases, Oils, Fuels,
Dilute Acids & Alkalis
Density: 1.7 g/cm3 (106 lbs./ft3)
Tensile Strength, ASTM F152: 1600 psi (11.04 MPa)
Compressibility, ASTM F36: 7 to 17%
Recovery ASTM F36: 40%
Temperature
Range:
-100 to 700°F (-73 to 371°C)
Continuous, max: 500°F (260°C)
Pressure, max: 1200 psig (83 bar)

Fluid Resistance - ASTM F146
IRM 903 oil, 5 h/300°F (149°C)

Thickness Increase:

 

 



0 to 15%

Weight Increase: 15%
ASTM Fuel B 5 h/70°F (21°C)
Thickness Increase:
0 to 10%
Weight Increase: 12%
Sealability
ASTM F37 (Fuel A):
ASTM F37 (Nitrogen):

0.03 mL/hr
0.5 mL/hr
Dielectric Breakdown, ASTM D149: 11.0 kV/mm (279 V/mil)
Gas Permeability, ASTM F2378: 0.05 cc/min
Creep Relaxation ASTM F38: 20%
Flexibility, ASTM F147: 10x

Note: ASTM properties based on 1/16" sheet thickness except ASTM F38, which is based on 1/32" sheet thickness. This is a general guide only and should not be the sole means of accepting or rejecting this material. The data listed here falls within the normal range of product properties but should not be used to establish specification limits nor used alone as the basis of design.

*For applications above Class 300, consult your representative.

 

 

M&Y AND PROPOSED ASTM GASKET CONSTANTS:

THICKNESS 1/16" 1/8"
M
Y psi (MPa)

3
3347 (23.1)

3.2
3385 (23.3)

Gasket Constants
Gb psi (MPa)
a
Gs psi (MPa)


497 (3.4)
0.226
3 (0.02)


486 (3.4)
0.276
0.4 (0.003)
*Gasket Constants based on proposed ASTM Draft 10.1

 

available sheet sizes:

Nominal
Thickness
Sheet Sizes
inches mm
Order Code
7900
Order Code
7950
Sheets
Per Roll
Approx.
Wt/Sheet
lbs (kg)
1/64" 0.5mm 60 x 63
60 x 126
1524 x 1600
1254 x 3200
DW05-060-063
DW05-060-126
DS05-060-063
DS05-060-126
20
10
3 (1.4)
7 (3.2)
1/32" 0.8mm 60 x 63
60 x 126
1524 x 1600
1254 x 3200
DW08-060-063
DW08-060-126
DS08-060-063
DS08-060-126
20
10
7 (3.2)
14 (6.4)
1/16" 1.5mm 60 x 63
60 x 126
120 x 126
1524 x 1600
1254 x 3200
3048 x 3200
DW15-060-063
DW15-060-126
DW15-120-126
DS15-060-063
DS15-060-126
DS15-120-126
10
5
2
14 (6.4)
28 (12.7)
55 (25.0)
2.0mm 60 x 63
60 x 126
120 x 126
1524 x 1600
1254 x 3200
3048 x 3200
DW20-060-063
DW20-060-126
DW20-120-126
DS20-060-063
DS20-060-126
DS20-120-126
10
5
2
18 (8.2)
38 (17.2)
74 (33.6)
3/32" 2.5mm 60 x 63
60 x 126
1524 x 1600
1254 x 3200
DW25-060-063
DW25-060-126
DS25-060-063
DS25-060-126
8
4
22 (10.0)
44 (20.0)
1/8" 3.0mm 60 x 63
60 x 126
120 x 126
1524 x 1600
1254 x 3200
3048 x 3200
DW30-060-063
DW30-060-126
DW30-120-126
DS30-060-063
DS30-060-126
DS30-120-126
8
4
1
28 (12.7)
55 (25.0)
110 (50.0)

Note: 1mm available on request. Please inquire about sizes and thicknesses not listed.

_____________________________________________________________________________________________________

Warning: Durlon® gasket materials should never be recommended when both the temperature and the pressure are at the maximums listed. Properties and applications shown are typical. No application should be undertaken by anyone without independent study and evaluation for suitability. Never use more than one gasket in one flange joint, and never reuse a gasket. Improper use or gasket selection could cause property damage and/or serious personal injury. The data reported is a compilation of field testing, field service reports and/or in-house testing. While the utmost care has gone into publishing the information contained herein, we assume no responsibility for errors. The information and specifications contained in this website are subject to change without notice. This revision cancels and obsoletes all previous editions.