Polyethylene Coating

Why not make the whole stopper in polyethylene?

Can Polyethylene give Sealability like butyl?

If it can't then what's the point of coating the butyl in it?

Actually I ll go for partial coating, closure is made from various kinds of rubber. Following are the main type: Butyl Halobutyl Natural The main purpose of coating is to minimise particulate matter / extractable / leachable in parental solutions. Second thing is to achieve reduced co-efficient of friction. that coating must withstand autoclaving at 121 deg cel atleast for 1 hr

GA lynlynch given the high temp just revealed.

In case of parylene, first thing is that Special Machine is required for it.

If ever making it from outside source, much expensive.

Both d ways nt affordable

Shrink wrap it with polyethylene shrink wrapping film. If physical bonding is required ,apply self curing rubber adhesive coating on the component and then shrink wrap with polyethylene film.

But how to apply film? before moulding or after moulding?

I dont think before moulding is possible

After molding the component, apply self curing rubber adhesive on the component place it on a shrink wrap film and pass it thro shrink wrap chamber.

Actually I want to coat bottom surface of Closure with polyethylene, this surface is not uniform leveled, design is quite intricate. u must hv idea about pharmaceutical rubber closure.

regarding PE film, do u know d trade name?

The information is really helpful, I must appreciate to you.

thanx