No, it is completely different.
Duct tape is made out of plastic, gaffer tape is made out of cloth.
Originally, the tape was made of "duck cloth" material. But it's name was DUCT TAPE. However "duck" sounds like "duct" in the real name "duct tape". One company's competing brand is called "duck tape brand duct tape". But the correct name is still "duct tape".
Duct tape is made of three separate layers, polyethylene, a cloth mesh and a rubber based adhesive
No
Yes, duct tape is flammable because it is made of a combination of materials such as cloth or plastic with an adhesive backing. When exposed to heat or flames, duct tape can catch fire and burn. It is important to store duct tape away from heat sources and open flames.
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No, it is different
Packaging tape is a little bit more stronger than duct tape.
Both are the same
The chemical formula for duct tape is not a compound that can be represented by a single formula. Duct tape is a combination of different materials such as a cloth or plastic backing, an adhesive layer, and possibly a waterproof coating.
From Wikipedia: Duct tape (sometimes called duck tape; is a vinyl, fabric-reinforced, multi-purpose pressure sensitive tape with a soft and tacky pressure sensitive adhesive.
Duct-Tape-Tastic Duct-Tape-Tacular