Product Notes for 105B
WEST SYSTEM 105 EPOXY RESIN:

Shelf life: If the containers are kept sealed when not in use 
WEST SYSTEM resins and
hardeners should remain usable for many years. Over time, 105 Resin will thicken slightly and will therefore require
extra care when mixing. Hardeners may darken with age, but physical properties are not affected by colour. Mini Pumps
may be left in containers during storage. It is a good idea, after a long storage, to verify the metering accuracy of
the pumps and mix a test batch to assure proper curing before applying epoxy to your project. Low Temperature
Considerations: When using WEST SYSTEM Epoxy at low temperatures, special precautions should be taken to assure
maximum performance. For detailed information on working with epoxy at low temperatures, refer to pamphlet #002-915
Cold Temperature Bonding and Coating with Epoxy. West System 105 EPOXY RESIN 105 Resin is the base material of the
WEST SYSTEM family of products, on which all of the WEST SYSTEM compounds are built. The resin is a clear, pale
yellow, low-viscosity liquid epoxy. Formulated for use with WEST SYSTEM hardeners, it can be cured in a wide
temperature range to form a highstrength solid with excellent moisture resistance. It is designed specifically to wet
out and bond withwood fibre, fiberglass, reinforcing fabrics, and a variety of metals. An excellent adhesive, 105
will bridge gaps and fill voids when modified with WEST SYSTEM fillers and can be sanded and shaped when cured. With
roller applications, it has excellent thin-film characteristics to flow out and self-level without "fisheyeing". The
resin cures clear so that you can achieve a natural finish when coating with varnish. It has a relatively high flash
point and no strong solvent odour, making it safer to work with than polyesters. Resin viscosity is approximately
1000 cps at 72°F (22°C). 105A Quart 105B Gallon 105C 4.35 Gallon 105E 51.35 Gallon