Products
VR 98
Material
VR 98 is an asbestos-free gasket material reinforced with a mesh of galvanized carbon steel. The composite material is physiologically safe and contains no color pigments. It consists of aramide fibers, inorganic fillers and other asbestos substitutes that are resistant to high temperatures, and are processed with high-grade elastomers under elevated pressure and temperature.
Properties
VR 98 is resistant to many media, e.g. oils, solvents, fuels, saline solutions, refrigerants, alcohols, etc. It is also suitable for sealing hot water and steam up to 200 °C in stationary applications and with an installation surface pressure of at least 50 N/mm². Please consult us if you have a specific application.
Compared with non-reinforced VR 90, the metal reinforcement lends the gasket material particularly high tensile strength plus high stress & shear resistance, and makes it extremely easy to handle.
VR 98 withstands higher combined pressure & temperature loads far better than non-reinforced materials.
Application
- for DIN and ANSI flanges, fittings, pumps and apparatus in chemical plants, refineries, power stations, and in shipbuilding
- in general for sealed joints in which high mechanical and/or thermal stresses or alternating loads occur
- for sealing components with relatively narrow webs, e.g. heat exchangers, steam fittings, air and refrigerating compressors as well as all threaded couplings
Surfaces
As standard, both sides of VR 98 are coated with a non-stick, high-friction layer that greatly facilitates disassembly. In most cases, additional surface treatment is unnecessary.
However, a graphite coating on one or both sides of the gasket is required when used with components that rotate on the gasket during assembly, e.g. in threaded couplings, radiator plugs, etc., as a low friction value is required in these cases.
Approval
Germanischer Lloyd (DNV GL)
Approval for shipbuilding
Technical Data
(nominal thickness 2.00 mm)
Density | g/cm³ | 2.00 – 2.20 |
Ignition loss acc. to DIN 52 911 | % | < 26 |
Tensile strength | ||
across grain | N/mm² | ≈ 20 |
with grain | N/mm² | ≈ 38 |
Residual stress acc. to DIN 52 913 | ||
16 h, 300 °C | N/mm² | ≈ 25 |
16 h, 175 °C | N/mm² | ≈ 35 |
Compressibility and recovery | ||
acc. to ASTM F 36, procedure J | ||
compressibility | % | > 5 |
recovery | % | > 60 |
Sealability against nitrogen | ||
acc. to DIN 3535, part 6 FA | mg/(s·m) | ≈ 0.25 |
Swelling acc. to ASTM F 146 | ||
in IRM 903 Oil (replaces ASTM Oil No. 3) | ||
5 h, 150 °C | ||
increase in thickness | % | < 10 |
increase in weight | % | < 10 |
in ASTM Fuel B | ||
5 h, room temp. | ||
increase in thickness | % | < 10 |
increase in weight | % | < 10 |
in water / antifreeze (50:50) | ||
5 h, 100 °C | ||
increase in thickness | % | < 5 |
increase in weight | % | < 5 |
Content of water-soluble chloride | ppm | < 100 |
Short-term peak temperature | °C | 400 |
Maximum continuous temperature | °C | 250 |
for steam up to | °C | 200 |
Maximum operating pressure | bar | 170 |
Max. continuous temperature and max. pressure must not occur simultaneously.
Please contact us for sealing parameters.
DIN 28091-2: | ||
Cold creep εKSW | % | 5 – 8 |
Cold recovery εKRW | % | 2 – 4 |
Hot creep during service εWSW/T | % | 6 – 9 |
Hot recovery εWRW/T | % | ≈ 1.5 |
Recovery R | mm | ≈ 0.030 |
Specific leakage rate λ | mg / (s·m) | < 0.2 |
Residual surface pressure | % | > 50 |
after 1000 h (in air at 100 °C) | ||
The data quoted above are valid for the material “as delivered” without any additional treatment. In view of the countless possible installation and operating conditions, definitive conclusions cannot be drawn for all applications regarding the behavior in a sealed joint. Therefore, we do not give any warranty for technical data, as they do not represent assured characteristics. If you have any doubt, please contact us and specify the exact operating conditions.
Form of delivery
Sheets
60” x 60”, 120″ x 60″, 180” x 60” (standard size)
Nominal thicknesses and tolerances acc. to ASTM F 104
Dimensional limits within a shipment
1/64” | +0.005”/-0.002” |
1/32” | ±0.005” |
3/64” | ±0.005” |
1/16” | ±0.008” |
3/32” | ±0.008” |
1/8” | ±0.008” |
Max. thickness variation in a sheet:
0.1 mm for sheet thickness ≤1.00 mm, and 0.2 mm for thickness >1.00 mm
Products
Download the Victor Reinz Product Catalog here.
