Thanks Randy and John
Over the weekend I did some serious digging online and found that Sommer, the brandname on the sheeting, was a specialist in France in floor soundproofing. They were taken over by a company called Tarkett Proffesionals who still manufacture soundproof materials in specialist areas. I have written to their Australian office asking for technical data if the have any available, seems like the take over was around 1974/5 so I might be pushing it. No reply as yet.
It does indicate that this is a sound proofing product though, and I was planning to use it adhered to a SIPS (structurally insulated panels - see R-Control sips panels USA) wall separating a row of 4 bedrooms and then covering it with an MDF 4mm thick sheet which I would use instead of gyprock or fibre cement board (all of which are available Randy). The SIPS panels have a good sound insulating quality to them as they are an osb sandwich with eps between them and I was wanting to just reduce the possibility of knock acoustics from a blow on a wall travelling thru it.
Any thoughts? Forget it and start again? I was, prior to locating this sheeting, going to use Green Glue for the same job. If I did would I need to apply it to both sides of the wall? Or will sound be stopped from either direction as it hits the Green Glue? I was going to do the same to hollow core internal bedroom doors - ie. put 4mm MDF sheet on either side of the door using Green Glue to stop sound tranmission thru the doors - would that work?
I really appreciate your help.