Graphite sheets

The 3R 887M is a flexible graphite sheet reinforced with a 0.0005" thick Mylar film. This sheet is made from exfoliated graphite flakes which is compressed into a foil by a carefully controlled calendering process. In this process, the expanded flake particles are mechanically locked together without the use of fibers, binders or other additives. Sheets of foil are then adhesively bonded and laminated to the required thickness.


The 3R 887M flexible graphite sheet has pressure-temperature sealing capabilities that are far superior to all asbestos and non-asbestos reinforced sheet products. It is resistant to chemical attacks by virtually all organic and inorganic fluids with the exception of concentrated, highly oxidizing acids.

Gaskets cut from this sheet seal low to moderate bolt loads and because of its very low creep relaxation, re-torquing is rarely required. Flexible graphite readily flows into flange irregularities enabling it to seal both smooth and coarse surface finishes.


Service limits

Temperature Limits
In air -240 °C à 510 °C (-400 °F à 950 °F)
Mild oxidizing environnement -240 °C à 850 °C (-400 °F à 1500 °F)
Non oxidizing environnement up to 980 °C (up to 1 800 °F)
Physical Properties
Compressibility (ASTM F-36)% 44
Recovery (ASTM F-36)% 15
Creep Relaxation (ASTM F-38) Less than 5%
Chemical Composition
Carbon Content 99% Minimum
Ash 0.8% Maximum
Leachable chloride 30 ppm maximum
Available Sheet Sizes
Thickness 1/32", 1/16", 1/8"
Sheet Sizes 39.4" X 39.4", 60" X 60 "
N.B. The information, details and values indicated are to the best of our knowledge. We recommend to conduct tests according to local conditions. The data is subject to some variations without notice.