Thinsulate for an overbag?

[Edward John M]

I have just lucked into a reasonable quantity of Thinsulate wadding at a very good cost.

How warm would a couple of layers of the 85 GSM UDS similar to this sold by Seatte Fabrics be?

http://www.seattlefabrics.com/60-3Mreg-Thinsulate-UDS-Insulation-675-linear-yard_p_152.html#

From other forum posts here I think I could use this As-Is if I am going to be using it inside my Goretex bivvy and over my existing sleeping bag

I think Richard Nisley has a page with the Clo values but I can’t seem to find it

[Jerry Adams]

thinsulate best application – something like gloves

it is a little warmer than other synthetics for the same thickness

it is a little less warm than other synthetics for the same weight

You could still use it for an overbag, it would just be a little heavier

[David Thomas]

If you’re placing it over high-loft down, it will compress the down somewhat. Better to put thinsulate under down.

[Edward John M]

I’m probably going to do it tho just to see how it works in the sewing machine

We got 70 metres of it for $30- so we can afford to play around, the seller used to work for RipCurlSki; and this is stuff left over from the Calgary Winter games back in 1988, she just wanted it to go to a good home

Subjectively it is as warm as the Nanopuff when sandwiched between some UL shell fabric

[David Thomas]

From Wikipedia: “different varieties of Thinsulate are made from different mixtures of polymers, but most are primarily polyethylene terephthalate (500F) or a mixture of polyethylene terephthalate (500F) and polypropylene (320F). Other materials in some include polyethylene terephthalate-polyethylene isophthalate (500F) copolymer and acrylic (320F)” into which I have inserted the melting point of each polymer.

I checked because I wondered if thinsulate could be an appropriate pot cozy material.  It looks like it would be.  Especially if you made a beanie-hat that doubles as a pot cozy.  Otherwise, a Reflectix cozy is nicely air-flow blocking without any additional shell material.

[Edward John M]

PM sent David

[Edward John M]

Double scrimmed insulation is so easy to use.

It took me an hour but a lot of that was finding a clean flat surface to work on. I simply cut out some for the foot and then folded and stitched the insulation blanket around it to give me a very basic shape.

Next step is to cut out a triangular insert panel to give me the room to fit my sleeping bag inside.

I now see why all the Chouinard gear of the 70s and 80s was the shape and size it was, the bivvy sleeping bags were cut to fit the length of the 60inch width of the scrimmed fabric they used

At worst it was an easy experiment

[Edward John M]

OK So that project was so easy I am going to have a go at making an UL overbag

I will start a new post with questions

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