Hello, could you please provide the NSF certificate for this item?

Dear, our NSF registration number is No.146038, you can check on the official website.

is this grease safe for plastic and fountain pens?

Yes. No problems in my 40+ years experience.

Can this be used on threaded connections instead of plumbers tape to prevent leaks?

This is not used to seal FPT (female pipe taper) and MPT (male pipe taper) plumbing pipe threads to prevent leaks. This is a lubricant that is primarily used on neoprene, butyl, nitrile, EPDM, etceteras, o-rings and gaskets. The lubricant assist in assembly and helps prevent bunching of the seal material as it is being tighten. It also aids in making a contact sealing surface for the o-ring and gasket. Examples where it might be use: sink/tub faucet valve stem, the o-ring on a PVC union or PVC union ball valve, etceteras. There are other pipe sealants that can be use to seal tapered threaded pipes like "Oatey White Pipe Joint Compound", "Highside Leak Lock Pipe Joint Sealant", "Permatex Thread Sealant with PTFE".

What is the percent of silicone in this product?

There is no information provided on the product packaging. All silicone greases are composed of silicone oil, PDMS, and a thickening agent, usually amorphous fumed silica, to make the oil into a grease. The exact proportions of the two may be proprietary info, so you would have to contact the mfr directly.

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KEZE Waterproof Food Grade Silicone Lubricant Plumbers Grease for Valve Sealant Faucet Pool Lube O Rings Filter 1 oz 1-Pack

KEZE Waterproof Food Grade Silicone Lubricant Plumbers Grease for Valve Sealant Faucet Pool Lube O Rings Filter 1 oz 1-Pack

Product ID: 511386231

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Details

Material
Silicone
Brand
Keze
Package Information
Bottle
Liquid Volume
1 Fluid Ounces
Item Weight
1 Ounces

💧Water & oxidation resistant

🧴NSF food-grade safe

🌡️Temp stable -40° to 400°F

Description

🔧 Keep your faucets flowing smoothly—because leaks are so last season!

MULTI SURFACE MASTER - Versatile silicone grease ideal for lubricating faucets, valve stems, O-rings, gaskets, and even scuba gear—one tube to rule them all.
PURE SAFE FOR DRINKING WATER - NSF-approved, odorless, and colorless formula ensures zero chemical contamination—perfect for faucets and food-grade applications.
LONG LASTING FRICTION REDUCTION - High raw silicone content delivers smooth operation and extends the life of hard-turning faucets and valves.
ULTIMATE TEMPERATURE RESILIENCE - Maintains perfect consistency from freezing cold to scorching heat (-40° to 400°F) for reliable performance in any environment.
WATERPROOF OXIDATION RESISTANT - Keeps seals and moving parts protected against moisture and corrosion, ensuring leak-free, hassle-free plumbing.

Keze Waterproof Food Grade Silicone Lubricant is a premium NSF-approved plumbers grease designed for valve sealants, faucets, O-rings, and gaskets. It withstands extreme temperatures (-40° to 400°F), resists water and oxidation, and provides long-lasting lubrication to prevent leaks and friction in plumbing fixtures and more.