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MRO Gaskets Information |
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VR 90 |
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| Material |
VR 90 is an asbestos-free gasket material. It is composed of aramide fibres, inorganic fillers and other asbestos substitutes which are resistant to high temperatures. These are firmly bonded to high-grade elastomers under elevated pressure and temperature to achieve exceptionally high gas sealability. |
| Properties |
VR 90 does not contain any physiologically harmful substances or color pigments.
VR 90 exhibits high tensile strength, stress and shearing resistance. The material is excellently suited to sealing off gases and fluids, e.g. oils, solvents, fuels, freons, liquid gases, water/antifreeze mixtures, saline solutions and many other media. It is also suitable for sealing hot water and steam up to approx. 390 °F, with stationary applications, and a mounting surface pressure of at least 7250 psi. For steam applications please consult Target Marketing.
Other characteristic properties of the material are excellent temperature resistance, stress resistance under high operating pressure and ease of handling. In most cases, VR 90 can be used effortlessly to replace CAF materials within a temperature range of up to 390 °F. |
| Application |
For DIN and ANSI flanged joints, apparatus, pumps, fittings and pipelines in industrial plants; e.g. in gas and hot water units, in solar panels, in convection radiators and connections; for sealing joints in internal combustion engines subject to high mechanical and thermal stress (oil, water, fuel and vacuum pumps etc.); for transmission, refrigerating and air compressors.
Since VR 90 is physiologically safe, it is particularly suitable for use in contact with drinking water and foods and for the sealing of highly pure, pollutant-sensitive products such as paint bases, vitamins, etc. |
| Surfaces |
The standard version of VR 90 has a non-stick top and bottom layer with a high coefficient of friction. This facilitates dismantling. Additional surface treatment is unnecessary in most cases.
However, a graphite coating on one or both sides of the gasket is required when used in components which rotate on the gasket during assembly, e.g. in screwed joints, radiator caps, etc., as in this case a low friction value is required. |
| Approvals |
ROTT
ROom Temperature Tightness test
Firesafe
according to BS 4161 and BS 6755
WRc/WRAS (WRc-NSF Ltd.)
Approval of sealing materials for use with drinking water
(according to British Standard BS 6920)
DIN-DVGW (acc. to DIN 3535, part 6 FA)
KTW/DVGW-Arbeitsblatt W270
Plastics in contact with drinking water
BAM
German Federal Institute for Materials Research and Testing,
flanged joints in oxygen carrying steel pipes up to 1450 psi (100 bar) and 176 °F (80 °C)
VP 401
Gaskets with higher thermal resistance
HTB
Higher thermal resistance,
according to DIN 3374/3376 1.45 psi (0.1 bar) and
14.5 psi (1.0 bar) and 1200 °F/30 min (650 °C/30 min)
SVGW
Swiss Gas And Water Society (Test Report No. 91-037-7)
UVV 61
"Gases", AD-B7 (VdTÜV) in conjunction with metal inner eyelet, blowout-proof gasket
ÖVGW Quality Mark
TA Luft
High-quality gasket. German air act (environmental standard)
Hungarian drinking water approval
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Technical Data
Nominal thickness
0.08" (2.00 mm)
unless otherwise specified |
Density |
112 - 125 lb/ft³ (1.8 - 2.0 g/cm³) |
Ignition loss
DIN 52 911 |
 34 % |
| Tensile strength |
transverse |
> 2610 psi (> 18 N/mm²) |
| ASTM F 152 |
Creep Relaxation
ASTM F 38 B (1/32") |
15 % |
| Residual stress DIN 52 913 |
| 16 h, 570 °F (300 °C) |
 3626 psi ( 25 N/mm²) |
| 16 h, 350 °F (175 °C) |
5220 psi ( 36 N/mm²) |
| VR-Hot compression test (@7250 psi) |
Thickness decrease
68 °F (20 °C) |
6 % |
| Thickness decrease additional, at maximum continuous application temperature |
8 % (480 ºF / 250 ºC) |
Compressibility and recovery
ASTM F 36, procedure J |
| compressibility |
5 - 8 % |
| recovery |
 55 % |
| Sealability against nitrogen |
| ASTM F 37 B (1/32") |
0.12 ml/h |
| DIN 3535, part 6 FA |
0.2 cm³/min |
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| Swelling ASTM F 146 |
in IRM 903 Oil (replaces ASTM Oil No. 3)
5 h, 300 °F (150 °C) |
| increase in thickness |
0 - 7 % |
| increase in weight |
7 % maximum |
in ASTM Fuel B
5 h, ambient temperature |
| increase in thickness |
0 - 10 % |
| increase in weight |
10 % maximum |
in water / antifreeze (50:50)
5 h, 210 °F (100 °C) |
| increase in thickness |
0 - 10 % |
| increase in weight |
10 % maximum |
| Leachable chloride content |
< 100 ppm |
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| Iron content |
< 0.3 % |
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| Thermal conductivity |
0.29 btu/ft h °F
( 0.5 W/(m·K)) |
Electrical specific resistance
after storage |
| at 50 % relative humidity, 48 h |
20 kV/mm |
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| at 570 °F (300 °C), 4 h |
30 kV/mm |
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Electrical specific resistance
after storage |
| at 55 % relative humidity, 48 h |
1 x 1012  cm |
| at 250 °F (120 °C), 1 h |
2 x 1013 cm |
| Temporary peak temperature |
750 °F (400 °C) |
| Maximum continuous temperature |
480 °F (250 °C) |
| for steam up to |
390 °F (200 °C) |
| with metal inner eyelet up to |
430 °F (220 °C) |
| Maximum operating pressure |
2180 psi (150 bar) |
| ASTM F 104 "line call-out" |
F711110A9B2E12K7M6 |
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Maximum continuous temperature and maximum pressure must not occur simultaneously, please refer to the table entitled "Max. operating pressure at various temperatures and various media"! |
| Sealing parameters see table: "Sealing Properties" |
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The data quoted above are valid for the material "as delivered" without any additional treatment. In view of the multiplicity of possible installation and operating conditions, definitive conclusions cannot be drawn for all applications regarding the behavior in a sealing joint. For this reason, we do not give any warranty for technical data. They do not represent warranted properties. If you have any doubt, please contact us and specify exact operating conditions. |
| Form of delivery |
Sheets |
60 x 60 inch, 60 x 120 inch, 60 x 180 inch |
Nominal thicknesses and tolerances
acc. to ASTM F 104 (inch)
Limits of size within a delivery |
| 1/64 |
1/32 |
3/64 |
1/16 |
3/32 |
1/8 |
+ 0.005
— 0.002 |
± 0.005 |
± 0.005 |
± 0.008 |
± 0.008 |
± 0.008 |
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| More exact tolerances by arrangement. |
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| ISO 9001:2000
JUST IN TIME, KANBAN, DOCK TO STOCK, SPECIAL PACKAGING, DROP SHIPMENTS...
MRO GASKETS CAN SUPPLY WHAT YOU NEED, WHEN YOU NEED IT | |
3239 South 51st. Avenue, Cicero, Illinois 60804
Phone: 708-780-9000 • Fax: 708-780-9009 • sales@mrogaskets.com |
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