ancestry
Trees Without Roots Fall Over
- Joined
- Jan 27, 2009
- Messages
- 5,008
I But everytime i've seen them used at the turnstiles they look paper. Very flimsy.
They look like paper but they are not paper. As mentioned above they are Tyvek. Tyvek is much more durable than the plastic KTTW cards although it may not seem that way from just looking at them.
As description of Tyvek from Wikipedia is as follows:
Tyvek is a brand of flashspun high-density polyethylene fibers, a synthetic material; the name is a registered trademark of DuPont. The material is very strong; it is difficult to tear but can easily be cut with scissors or a knife. Water vapor can pass through Tyvek (highly breathable), but not liquid water, so the material lends itself to a variety of applications: envelopes, car covers, air and water intrusion barriers (housewrap) under house siding, labels, wristbands, mycology, and graphics. Tyvek is sometimes erroneously referred to as "Tyvex."