Chinook C4

[doms1]

I'm refurbishing an old C4... I think that the tubes are hypalon but can anyone confirm?

[Locozodiac]

If it's plain smooth fabric when finger rubbing, it's definitely Hypalon. PVC is visibly more tinny dotted or square tiny dotted than Hypalon.

Happy Boating

[HUMBER P4VWL]

Originally Posted by Locozodiac

If it's plain smooth fabric when finger rubbing, it's definitely Hypalon. PVC is visibly more tinny dotted or square tiny dotted than Hypalon.

Happy Boating

Eh? I thought PVC was shinier and smoother?

[Locozodiac]

Both Hypalon & PVC fabrics are smooth when rubbed, the difference is the fabric texture look.

Happy Boating

[rik_elliott]

Look at the seams on the tubes. If they are glued - its almost certainly hypalon. If they are welded, it is PVC

[colcreate]

Our old diving club had a Chinook rib and it was definitely Hypalon as we carried out some repairs on it. The tubes were original and I believe the ribs were all made locally to me (Cheshire) on a farm?? Originally they made SIBs, then progressed to RIBs and even changed some of their earlier SIBs to RIBs or so our DO assured me about 20 years ago!

A while back a Chiorino company rep (they used to make Hypalon fabric) told me that if you hold a flame to an offcut of Hypalon fabric it will char where as other stuff PVC and Polyurethane will melt. (you know I think I will put that to the test tomorrow)
Could make for an interesting write up on an insurance claim form....

Oh and glued seams does not indicate Hypalon

[Tim M]

Indeed, as far as I'm aware Chinooks were all hypalon.

[rik_elliott]

PVC or Hypalon? | Polymarine Paints, Adhesives, Parts & Accessories