Do these stretch over plugs while the wire is skinny and the plug is fat?

No, they don't stretch that much. I think its 2 to 1 ratio. I don't think it will work for you.

Are these flame retardant rated?

Retardant, yeah, fireproof, naw. I use a Bic lighter to seal mine up. Couple of seconds under the flame, bingo all done. Will they burn, yeah probably, if your battery pack explodes.

What is the listed voltage rating of this heat shrink?

I don't know as I was using it for low voltage.

Is this set free of adhesive? I need tubing that is not adhesive-lined.

These are adhesive free. They only require heat to shrink them to seal whatever you are sealing

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650pcs Heat Shrink Tubing Black innhom Heat Shrink Tube Wire Shrink Wrap UL Approved Ratio 2:1 Electrical Cable Wire Kit Set Long Lasting Insulation Protection, Safe and Easy, Eco-Friendly Material

650pcs Heat Shrink Tubing Black innhom Heat Shrink Tube Wire Shrink Wrap UL Approved Ratio 2:1 Electrical Cable Wire Kit Set Long Lasting Insulation Protection, Safe and Easy, Eco-Friendly Material

Product ID: 154740271

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Details

Brand
innhom
Material
Polyolefin
Color
Black
Item Weight
0.21 Kilograms
Outside Diameter
0.51 Inches
Item Length
3.53

⚡High Dielectric Strength

🌱Eco-Friendly Material

🔒Durable Protection

Description

🔧 Shrink Your Worries Away!

EASY TO USE - Fast shrinkage with a heat gun, making your projects a breeze.
VERSATILE SIZES - Includes 8 sizes to cover all your wiring needs, from RC hobbies to electronics.
SUPERIOR STRENGTH - Withstand extreme conditions: cold-resistant down to -22℉ without cracking.
ULTIMATE PROTECTION - Experience long-lasting insulation that outperforms traditional tape.
HEALTH CONSCIOUS CHOICE - Made from eco-friendly materials, ensuring safety for you and the planet.

The innhom 650pcs Heat Shrink Tubing set offers a comprehensive solution for electrical insulation and protection. With a 2:1 shrinkage ratio, this UL-approved kit includes 8 sizes of durable, eco-friendly tubing that provides excellent resistance to acids, alkalis, and extreme temperatures. Designed for versatility, it’s perfect for various applications, ensuring safety and longevity in your wiring projects.