Jet Lube Z-50 and Z-60 all contain prime grade zinc and are respectively formulated with 40%, 50% and 60% metallic zinc, meeting the metallic zinc requirements described in API bulletin 5A2. Z-50 and Z-60 are manufactured with Jet Lube unique grease compounded from custom refined, low sulfur oil. All contain special additives to reduce the plating and buildup of metallic zinc encountered with other zinc compounds. The grease base ensures brush ability over a wide temperature range, tenacious adherence to all surfaces, resistance to water wash out and the prevention of rust/corrosion. The metallic zinc particles and other additives are maintained in uniform suspension throughout the compounds and Z-50 and Z-60 displace moisture and adhere well to wet tool joint surfaces.