J/30 Class Association Forums J/30 Forum One Design Class Rules Mainsail Material - is Hood VECTRAN legal?

I was reading the Hood sails website about VECTRAN

Is this a legal fabric under the class rules?
5.12.1.2 Mainsail shall be manufactured from woven ply polyethylene terephthalate ("PET"), such as Dacron®, or woven ply polyethylene naphthalate ("PEN"), such as Pentex®. The spinnaker shall be manufactured from woven ply nylon.

and

5.12.2.1 Minimum cloth weight is 6.25 oz.

The reason I ask, is I saw a three year old well used main on a C&C35 I was sailing on this past weekend and the sail looked in pretty good shape. It looks like Dacron with a gauze woven in to hold its shape.