Aluminium Tape

Probably not.

No way of knowing with what you've said, so far.

If I was your consultant, I'd tell you to get the correct tape.

There's no way strangers can save you, without knowing a LOT more.

look at Venture tape

Thanks Rixter.I understand.The Aluminium tape is used to join 2 Fiberglass insulation together to the duct.This is further covered by Canvas cloth and vapor barrier.Thee is no load on the tape.In that case would overlapping can achieve my desired Tensile strength

If there is no load on the tape then why are you worrying about the tensile strength?

That doesn't make sense.

If the requirement is 7.2, two layers of 3.6 will not work because even if both tapes were exactly 3.6 (and they won't be) the adhesive will add enough variation in the bond to cause failure just as was stated by Rixter.

If you are certain that the customer does not need a requirement of 7.2, then you will have to prove that to them.

Sometimes requirements seem to appear out of nowhere. If the extra strength is not necessary and was just specified because it was the material that happened to be available at the time, then you need to revisit the design. Perhaps it will result in a cost savings.

Try this exercise:

The tensile strength might be specified for the purpose of being strong enough to remove at a later date once the glue had age hardened.

A tape of 'half' thickness applied twice might not be any good, it could break easily making it difficult and messy to remove.

Here is a novel idea, ask the consultant where they got the spec for the tape. More than likely, it came from some data sheet somewhere which means they should know where to procure it or at least the brand name.