Re: Re: Tyvek ground cloth [2 Attachments]

I just got a sample of Tyvek 1460, which is a cloth-type Tyvek without the
surface treatments that reduce hydrostatic head rating for water
penetration (1460 exceeds 50).  It's available by the yard at Quest
Outfitters.

http://questoutfitters.com/uncoated_fabrics.htm#TYVEK

I have *not* field tested it yet.

Quest also carries the 1443R, which is a bit lighter, but has Corona
treatment that reduces the hydrostatic head rating considerably (from over
50 to under 15). I have used this (from a kite distributor) in the field
and found it quite useful. I got the 1460 on a search for a version that
was similarly useful but had a higher rating for water repellency.


There's also a promising grade Tyvek14M, lighter than 1460, but more water
repellant than the 1443R. It is also not Corona treated (so hydrostatic
head over 50). I am hopeful that it may combine the light weight of the
1443R with the water repellency of the 1460.

So far I've seen it sold only in bulk (60 inches by 10 yards and larger)

http://www.materialconcepts.com/store/products/60-x-10-yard-tyvek-14m

It may, apparently, be available by the yard at distributors of fine art
packaging materials. But I haven't found them yet.

I have not field-tested either 1460 or 14M, but I now have both, and will
try to test them this summer.

I attach spec sheets for 1460 and some information about 14M. I've been
told that the 14M also has a 50 rating for hydrostatic pressure and it's
about 40% lighter than the 1460, on my scale.

The supplier who sent me a sample has offered to distribute it through
Quest Outfitters if there's a demand for it.

John Curran Ladd
1616 Castro Street
San Francisco, CA  94114-3707
415-648-9279


On Mon, Jun 10, 2013 at 7:05 PM, jrwooden <jim-TZ6VOGY/[email protected]> wrote:

> **
>
>
>
> yes ... that is the same chart I was looking at ...
>
> Type 10 – Is the stiff smooth paper-like stuff for printing/packaging
> applications so crunchy... so less than ideal...
>
> Type 16 – perforated for high air permeability so seems a bad plan...
>
> Type 14 – softer fabric-like series, and OF THE 14xx series the 1422A is
> the only one with the hydrostatic head rating...so that's where I was
> thinking of going...........
>
> I had an e-mail exchange a while back with Dupont on the topic, but the
> agent I was working with could not really get his head around the
> ground-cloth application ;-/
>
>
> Jim
>