STL is lithium based, anti-galling and:

• Is especially effective between parts made of dissimilar metals
• Is effective and stable from -20°F to +300°F
• Maintains grounding continuity; should not be used on exposed current-carrying parts
• Has excellent adhesion qualities; a liberal application on threaded joints maintains raintightness and inhibits corrosion

HTL is a high temperature, anti-seize, conductive thread lubricant:

• Effective and stable from -70°F to +1800°F
• Prevents seizure, galling, rust, galvanic action
• Maintains grounding continuity; should not be used on exposed current carrying parts
• Effective between parts made of dissimilar metals