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Dale Wambaugh
(dwambaugh) - MLife

Locale: Pacific Northwest
What kind of foam is this? on 11/23/2010 14:56:42 MST Print View

I got a big roll of this blue foam, but I don't know what type it is--- I think it is EVA. It is closed cell, with a "skin" on the surface, 3/16" (5mm) thick, and a piece that is 20" wide and 67" long weighs 7.6oz/220g.

The roll is 67" wide and there must be 30 feet of the stuff.

Any ideas?


Photo of the mystery blue foam

Rick Dreher
(halfturbo) - MLife

Locale: Northernish California
Re: What kind of foam is this? on 11/23/2010 15:32:08 MST Print View

Hi Dale, looks like you'll be able to make sleep pads for Paul Bunyon and his ox.

Sure looks like EVA foam to me. Have fun inventing stuff!

Rick

eric chan
(bearbreeder) - F - M
thinner version ? on 11/23/2010 15:32:33 MST Print View

http://www.mec.ca/Products/product_detail.jsp?PRODUCT%3C%3Eprd_id=845524442094779&FOLDER%3C%3Efolder_id=2534374302701645

Dale Wambaugh
(dwambaugh) - MLife

Locale: Pacific Northwest
Re: thinner version ? on 11/23/2010 17:19:12 MST Print View

Mike Clelland reviewed the MEC bivy pad, which is 5mm. Looks like is about the same weight-- 150cm x 50cm and 175g vs mine at 170cm x 50cm and 220g. R-value is 0.66 for the MEC yellow 5mm pad.

I never knew there were so many kinds of EVA-based foam. From what I gather, they vary in EVA content (18% for the good MEC/Zotefoams stuff) and I did know about different manufacturing techniques--- fluffing with nitrogen gas, etc.

Should be good under my torso-length Prolite and for sit pads. Can hammock folk use it for insulation?






http://www.backpackinglight.com/cgi-bin/backpackinglight/reviews/display_reviews?forum_thread_id=4722&cat=Sleeping%20Pads%20-%20Foam&cid=41

http://www.mec.ca/Products/product_detail.jsp?PRODUCT%3C%3Eprd_id=845524442094583&FOLDER%3C%3Efolder_id=2534374302701645&bmUID=1163431149644

eric chan
(bearbreeder) - F - M
math on 11/23/2010 20:27:36 MST Print View

i worked out the math a bit ago on the mec blue vs. yellow vs thermarest pads

if the R values are to be believed then the mec blue actually had a higher R value than yellow for a given weight and area/thickness ...

youll prob get an R value 1/2 of the 1cm blue mec pad ... so 1.3 / 2 =0.65

no idea about hammocks ... i aint a koala =P


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the reflectix is listed as 1.25 oz/ ft2 ... so 11.25 oz/ yd 2 ... for an R value of 1.1 if we accept the manuf claim ... which is an R per oz/yd of 0.097

the mec blue standard 9.25 oz / yd if my math is correct ... for an R value of 1.36 .. R per oz/yd of 0.146

the mec yellow standard 13.75 oz / yd if my math is correct ... for an R value of 1.6 .. R per oz/yd of 0.116

the yellow thermalest zlite is 12.93 oz / yd 2 ... for an R value of 2.2 ... giving and R per oz/yd of 0.17

the RR Solar is 17 oz / yd 2 ... for an R value of 3.5 ... giving and R per oz/yd of 0.20

Edited by bearbreeder on 11/23/2010 20:30:57 MST.