Copper-based anti-seize lubricant of the highest purity. It is formulated to have the lowest practical levels of halogens, sulfur and heavy metals.LOCTITE LB N-1000 is a copper-colored/based anti-seize lubricant of the highest purity. It is formulated to have the lowest practical levels of halogens, sulfur and heavy metals. It has a general composition of copper and graphite flake in a petroleum carrier. It prevents high friction, galling, seizing and thread destruction. Its operating range is up to +1,799.6 °F (+982 °C).