X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 13 Oct 2014 07:09:59 -0400 Message-ID: X-Original-Return-Path: Received: from [63.230.26.161] (HELO exchange.arilabs.net) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 7202580 for lml@lancaironline.net; Fri, 10 Oct 2014 12:14:18 -0400 Received-SPF: none receiver=logan.com; client-ip=63.230.26.161; envelope-from=kevin@arilabs.net Received: from exchange.arilabs.net ([10.100.100.1]) by exchange.arilabs.net ([10.100.100.1]) with mapi; Fri, 10 Oct 2014 10:13:41 -0600 From: Kevin Stallard X-Original-To: Lancair Mailing List X-Original-Date: Fri, 10 Oct 2014 10:13:40 -0600 Subject: RE: [LML] Re: UV & IR Filtering Film on Acrylic Windows Thread-Topic: [LML] Re: UV & IR Filtering Film on Acrylic Windows Thread-Index: Ac/jsdG1M0w3SJ3eRy+ta01thXMsTwA8KoKQ X-Original-Message-ID: <779FE3D761D7B741813E300858A248CF010CC998573C@exchange.arilabs.net> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 According to Wikipedia, sunburns are caused by UV radiation in between the = UVA and UVB bands. You can get burned under UVA, but it much harder to do = so than under the effects of UVB. UVB is responsible for creating Vitamin = D, but can also damage DNA ( I was wondering where that third arm was comin= g from, I wonder if the FAA has a medical exemption for it ) UVA is UV radiation in wavelengths between 400 or 315 nm (not absorbed by t= he atmosphere), UVB is between 315 and 280 nm (mostly absorbed by the atmos= phere). They have a nice graph that seems to show most of the skin burnin= g wavelengths between 300 and 325-330 nm. Also according to Wikipedia, Poly(methyl methacrylate) (or PMMA, aka acryli= c and plexiglas) absorb UV wavelengths at around 300-315 nm, which happens = to be the same was window glass. Some manufacturers add things to it to do= UV absorption from 400 nm. Window glass (and PMMA) absorbs most of, if not all UVB. It absorbs about = 75% of UVA, mostly near the 315 nm area if I understand this correctly. Th= ese additives appear to grab the rest above 315 nm. So, it appears you can indeed get tan or some burning of the skin under gla= ss, but it is very reduced compared to being out in the open. But it also = explains why my glasses wouldn't darken while in the airplane. Kevin =20 ________________________________________ From: Lancair Mailing List [lml@lancaironline.net] On Behalf Of Thorn, Vali= n B. (JSC-VA411) [valin.b.thorn@nasa.gov] Sent: Thursday, October 09, 2014 5:11 AM To: Lancair Mailing List Subject: [LML] Re: UV & IR Filtering Film on Acrylic Windows Hi Doug, Of course, the UV protection is for passenger skin and to protect the mater= ials from rapid break down. I=92d rather not have to put sun screen on to = go flying. The IR is to limit the greenhouse heating effect. The canopy = shades seem a little clunky to me =96 but, haven=92t ruled them out if this= doesn=92t work=85 I haven=92t heard back from Kim yet on what filtering properties the acryli= c has. Thanks, Valin From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Doug= las Brunner Sent: Wednesday, October 08, 2014 5:24 AM To: Lancair Mailing List Subject: [LML] Re: UV & IR Filtering Film on Acrylic Windows Valin, Why do you want to do this? Not a criticism, just a question. What I have found to be extremely valuable is a canopy shade that allows me= to control the amount sun that comes in. D. Brunner From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Thor= n, Valin B. (JSC-VA411) Sent: Tuesday, October 07, 2014 4:47 PM To: Lancair Mailing List Subject: [LML] UV & IR Filtering Film on Acrylic Windows Hello, We=92re looking at applying ultraviolet and infrared filtering films on our= Legacy=92s canopy. Not looking to darken it since the canopy has some tin= ting in it already -- though, looking to filter as much UV and IR as possib= le. There are several products from 3M, Llumar, and others with these prop= erties used on cars and glass windows every day. Has anyone one applied any window tinting or other films to their acrylic w= indows? How did it work out or not? Kim at Lancair is checking with their acrylic window vendor to see what UV = and IR filtering properties their acrylic windows already have. Thanks, Valin Thorn Legacy Project Colorado BTW, Paul and Marv, this is an example of a question that applies to all La= ncair aircraft types. We could use a category on Lancairtalk.net for these= kinds of general topics, questions. ________________________________ [http://static.avast.com/emails/avast-mail-stamp.png] This email is free from viruses and malware because avast! Antivirus protection is active.