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BOTB Member

Registered: 08-2010
Posts: 35
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latex vs polyurethane vs silicone for cowls


again - this is gleaned from other threads, but was wondering the pro's and cons of the various materials for cowls

latex - shrinks when you are casting, but cheap and durable. Nice stretch to get that ooo skin tight feel. Weird smell. Makes you sweat like a pig.

polyurethane - almost no shrink on casting. Bit more expensive. A little stiffer. Not sure abt durability (quite good I would think?) or comfort on wearing.

silicone - no shrink. expensive and heavy. From my mold making - I would say pretty tear resistent, but not as much stretch in it compared to latex.

any1 esle with opinions I would gladly receive!! Especially in the comfort to wear side as I have only ever tried the cheapo vinyl licenced cowls in the past.

- S

Last edited by Phantombatman, 3/5/2018, 7:49 pm
8/14/2010, 8:52 pm Link to this post Send Email to dog biscuit   Send PM to dog biscuit
 
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Keeper of the Cave

Registered: 08-2005
Location: Gotham
Posts: 1614
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Re: latex vs polyurethane vs silicone


There are so many thousends of mixtures of Elastomers around that it is Not possible to make a statement on „Rubber“ „Silicone“ or „Urethane“ , it depends on the process used, and the mixture.

Kautchuk (Latex) , Silicone, Urethane, and Vinyl are all Polymers called Elastomer.
But I can say this to your post:
Natural Latex Rubber(Kautchuk) is not very durable when exposed to Sun, Water, Fat, Oil ( beside Silicone Oil), heat.
When You use a Cowl in Winter, you don’t sweat like a pig, but in Summer you will, either with Kautchuk, Silicone, or Urethane, and also with Vinyl Cowl. (Even without Cowl you may sweat like a pig in Summer ;)
Polyurethane may shrink, it really depends on the mixture, and the durability depends on the mixture as well.

Here a list of Elastomeres,You can see that there are so many of them, and some you may know also (Neoprene for example).
 


Natural rubber (often called LATEX)
Synthetic polyisoprene (IR)
Butyl rubber (copolymer of isobutylene and isoprene, IIR)
Halogenated butyl rubbers (chloro butyl rubber: CIIR; bromo butyl rubber: BIIR)
Polybutadiene (BR)
Styrene-butadiene Rubber (copolymer of polystyrene and polybutadiene, SBR)
Nitrile rubber (copolymer of polybutadiene and acrylonitrile, NBR), also called Buna N rubbers
Hydrogenated Nitrile Rubbers (HNBR) Therban and Zetpol
Chloroprene rubber (CR), polychloroprene, Neoprene, Baypren etc.
EPM (ethylene propylene rubber, a copolymer of ethylene and propylene) and EPDM rubber (ethylene propylene diene rubber, a terpolymer of ethylene, propylene and a diene-component)
Epichlorohydrin rubber (ECO)
Polyacrylic rubber (ACM, ABR)
Silicone rubber (SI, Q, VMQ)
Fluorosilicone Rubber (FVMQ)
Fluoroelastomers (FKM, and FEPM) Viton, Tecnoflon, Fluorel, Aflas and Dai-El
Perfluoroelastomers (FFKM) Tecnoflon PFR, Kalrez, Chemraz, Perlast
Polyether block amides (PEBA)
Chlorosulfonated polyethylene (CSM), (Hypalon)
Ethylene-vinyl acetate (EVA)
Various other types of elastomers:
Thermoplastic elastomers (TPE), for example Elastron, etc.


---
RED THE BATARANG GUY
Always be yourself in life, unless you can be Batman. Then be BATMAN !

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http://www.phantombatman.webs.com/
8/15/2010, 2:33 am Link to this post Send Email to Phantombatman
 
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BOTB Member

Registered: 08-2010
Posts: 35
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Re: latex vs polyurethane vs silicone


thanks for reply mate
I assumed that when someone said latex - they had meant pure latex. But it would seem not.

Also, although I tried to categorise for ease in my head, the reality is that there prob isnt a perfect material to use.

personal experience it seems will be the best teacher

thanks.
8/20/2010, 7:33 pm Link to this post Send Email to dog biscuit   Send PM to dog biscuit
 


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