cheers guys.. some food for pay day so to speak
cheers guys.. some food for pay day so to speak
But aren't the alpkit hunka bivvy bags pertex? I know thay don't claim they're waterproof but come to that no fabric is 100% waterproof is it?
They are treated, so they are waterproof, but waterproof in most cases a question of the amount of water a material will resist. They use a column of water to express the degree of resistance a material has. From memory Gore-Tex is something like 8000mm.Originally Posted by Grouse
WaterProof has a very specific meaning It has to be able to with stand a collum of water 1,000mm high as a starting point for very basic lightweight fabrics, Goretex is tested to 20,000mm but will probably go higher than 50,000 with a strong face fabric
Under 1000mm you can only say resistent. if the fabric is "waterproof" but it has stitched non sealed seams you cannot call it water proof. Most rucsacs are a case in point the fabrics are waterproof but unless they have taped or glued seems they are not "waterproof Rucsacs"
WATERPROOFING IN MM TRANSLATED
•0mm: obviously not waterproof in any way. Sieves, screen doors, basketball nets.
•0mm-1000mm: rain resistant, but not rainproof. Most stretch-woven softshells fall here.
•1000mm-5000mm: rainproof but not waterproof under pressure (sitting on or leaning against wet surfaces). Engineered (laminated) softshells, inexpensive rain shells, low-end ski and snowboard wear.
•5000mm-15,000mm: totally rainproof and generally waterproof unless under serious pressure (extended sitting, submersion, heavy people sitting). Most proprietary coatings (generally, liquid polyurethane coatings that become porous when applied to fabrics and cured) fall in this range.
•15,000mm-30,000mm: totally waterproof, even under serious pressure. High-end proprietary PU laminates, PTFE membranes like eVent and GORE-TEX® fabrics. Can withstand shallow-depth submersion without leaking (fishing waders, drysuits for sailing).
Last edited by IanDarkpeak; 22-01-2012 at 10:51 PM.
Alpkit Hunka bivvy bags aren't made from Pertex-branded fabric. Pertex used to be made by Perseverance Mills in Padiham, which at one time had been an umbrella fabric factory. I think the Pertex brand is now owned by a Japanese company
Good techy info re proofing Ian!
Poacher turned game-keeper
http://www.pertex.com/ has history and info on brand and fabrics
Poacher turned game-keeper
Don't get confused between Pertex and Pertex Shield - they aren't the same. Pertex on its own is highly windproof and extrmely breathable, and water repellent when treated with a hydorphobic chemical (whilst it lasts). It's perfect for general running, but won't keep out prolonged rain or pass kit checks where waterproof is stated. Pertex Shield IS waterproof as it has a polyurethane laminate added to the Pertex face fabric, and will pass a kit check if seams are taped.
This article gives a good summary of its properties:
http://www.backpackinglight.com/cgi-...ex_shield.html
It's funny how these keep coming back up, We had then all on a reproofing/washing thread.Alpkit Hunka bivvy bags aren't made from Pertex-branded fabric. Pertex used to be made by Perseverance Mills in Padiham, which at one time had been an umbrella fabric factory. I think the Pertex brand is now owned by a Japanese company
Good techy info re proofing Ian!
The umbrella fabric was back in the 1920s or 1930s iirc FJ
Poacher turned game-keeper
A bit of an anamoly is that a paramo waterproof wouldn't pass a kit check and neither would a ventile top if you could still get such a thing but I would rate either as much better extreme weather protection than most running cags albeit not the easiest things to get in your bumbag!
Are we all posting so often at the moment because we are checking every half hour or so to see if a certain race entry has gone 'live'? The next race will be to the post box when it does.
Last edited by Mark G; 23-01-2012 at 09:18 AM.
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