Re: [MBZ] Can ultraviolet light penetrate glass.
> Craig wrote: > > Sorry, Jerry, it's a fool's errand. It was tested in 2003 and > that with the right kind of cars! > https://www.ncbi.nlm.nih.gov/pubmed/12925188/ > > Photodermatol Photoimmunol Photomed. 2003 Aug;19(4):175-81. > UV exposure in cars. > Scott wrote: > From HPS: Standard window glass, according to the International > Ultraviolet Association, will allow UV-A to pass through while > almost 100% of the UV-B and UV-C light is blocked. But for a lipid virus, it doesn't matter because full sunlight doesn't provide "strong" enough UV to inactivate it. The heat will hasten it's demise. And the UV that does get through might be effective against other stuff. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Can ultraviolet light penetrate glass.
>From HPS: Standard window glass, according to the International Ultraviolet >Association, will allow UV-A to pass through while almost 100% of the UV-B and >UV-C light is blocked. > -Original Message- > From: Mercedes [mailto:mercedes-boun...@okiebenz.com] On Behalf Of > Jerry Herrman via Mercedes > Sent: Wednesday, April 22, 2020 1:40 PM > To: mercedes@okiebenz.com > Cc: Jerry Herrman > Subject: [MBZ] Can ultraviolet light penetrate glass. > > I did not know where to get this question answered so I decided to submit it > to > the boys at The Mercedes Digest. Somebody there surely knows the answer. > After all, it is an automotive question, right? > > After wearing my COVID face mask in the car, I leave it on the dashboard so > the sun's rays have an opportunity to kill any harmful microbes that may be > present. Which brings up the question of whether or not the ultraviolet rays > can penetrate glass, specifically automotive windshield glass. It is my > understanding that to kill microbes, a wavelength of 254 nanometers is > necessary, most of which doesn't make it to earth. So is this a useful > practice > or a fool's errand? > > Jerry > > 1982 240D > > > > > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Can ultraviolet light penetrate glass.
Plexiglas = acrylic, so yeah, that's not stopping UV, but UV can make it yellow and weak. IIRC it also shatters into sharp shards. Not what I'd choose for a canopy. Lexan = polycarbonate = more better. PC eyeglass lenses are considered UV blocking. They're strong, moderately high index, and block UV. The biggest argument against PC is it induces chromatic aberration when you aren't looking through the center of the lens. Mitch. On Wed, April 22, 2020 8:00 pm, OK Don via Mercedes wrote: > Plexiglas does pass enough UV to cause sunburns, as I've gotten them in > the past in an airplane. When we repaleced the windshield in the C182, I > bought one with 95% UV blocking and could only get up to 50% IR blocking. > It is > noticeably more comfortable than plain Plexiglas, whether tinted green or > gray, or clear. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Can ultraviolet light penetrate glass.
Plexiglas does pass enough UV to cause sunburns, as I've gotten them in the past in an airplane. When we repaleced the windshield in the C182, I bought one with 95% UV blocking and could only get up to 50% IR blocking. It is noticeably more comfortable than plain Plexiglas, whether tinted green or gray, or clear. On Wed, Apr 22, 2020 at 3:19 PM fmiser via Mercedes wrote: > > Curt wrote: > > > I read the other day that a mask does little to protect you from > > random COVID. Supposedly the mask keeps you from passing COVID > > to somebody else... > > Yup. Unless it seals tight against your face it does almost > nothing to protect the wearer. > > A surgical mask it to keep the surgeon from infecting the patient, > not the other way around! > > > https://multimedia.3m.com/mws/media/409903O/respiratory-protection-against-biohazards.pdf > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > -- OK Don "Whenever you find yourself on the side of the majority, it is time to pause and reflect." Mark Twain “Basic research is what I’m doing when I don’t know what I am doing.” Wernher Von Braun 2013 F150, 18 mpg 2017 Subaru Legacy, 30 mpg 1957 C182A, 12 mpg - but at 150 mph! ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Can ultraviolet light penetrate glass.
> Curt wrote: > I read the other day that a mask does little to protect you from > random COVID. Supposedly the mask keeps you from passing COVID > to somebody else... Yup. Unless it seals tight against your face it does almost nothing to protect the wearer. A surgical mask it to keep the surgeon from infecting the patient, not the other way around! https://multimedia.3m.com/mws/media/409903O/respiratory-protection-against-biohazards.pdf ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Can ultraviolet light penetrate glass.
> Jerry wrote: > After wearing my COVID face mask in the car, I leave it on the > dashboard so the sun's rays have an opportunity to kill any > harmful microbes that may be present. Which brings up the > question of whether or not the ultraviolet rays can penetrate > glass, specifically automotive windshield glass. Yes, UV will get through, but greatly reduced. > It is my understanding that to kill microbes, a wavelength of 254 > nanometers is necessary, most of which doesn't make it to earth. > So is this a useful practice or a fool's errand? The intensity of full sunlight is insufficient to deactivate a lipid virus, so the UV exposure will do nothing for the Wuhan flu. However, the elevated temperature will definitely decrease the time for the virus to deactivate. The UV exposure may be enough for bacteria or fungus - I don't know. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Can ultraviolet light penetrate glass.
On Wed, 22 Apr 2020 12:03:24 -0600 Craig via Mercedes wrote: > Go to https://www.ncbi.nlm.nih.gov/pubmed/12925188/?report=docsum for a > listing of similar articles and their links: For those who want even more information, particularly if you live in areas with high UV (Arizona and New Mexico, among others), or are concerned about skin cancer (particularly the third through fifth articles): Phys Med Biol. 1999 Apr;44(4):917-26. Ultraviolet radiation penetrating vehicle glass: a field based comparative study. Kimlin MG[1], Parisi AV. [1] Centre for Astronomy an Atmospheric Research, Faculty of Sciences, University of Southern Queensland, Toowoomba, Australia. Abstract The solar UV transmitted through automobile glass was measured in the field in two cars using a spectroradiometer. The two cars were identical except that one of the cars had all of the windows (except the windshield) tinted. The measured spectral erythemal UV on a horizontal plane with the windows fully closed was reduced in the tinted car by a factor of 42 when compared with the erythemal UV measured in the untinted car. The ambient UVA irradiances at various locations within four different makes of car and a tractor were also measured with a broad band UVA handheld meter. The average normalized daily UVA exposure (measured with a broad band UVA meter) was 1.3 times higher in a large family sedan when compared with that in a small hatchback and the UVA exposure in a car with tinted windows was 3.8 times less than in a similar untinted car. PMID: 10232805 DOI: 10.1088/0031-9155/44/4/008 = = Br J Dermatol. 2004 Oct;151(4):873-6. Implication for photosensitive patients of ultraviolet A exposure in vehicles. Hampton PJ[1], Farr PM, Diffey BL, Lloyd JJ. [1] Regional Medical Physics Department, Royal Victoria Infirmary, Newcastle-upon-Tyne NE1 4LP, UK. Abstract BACKGROUND: Photosensitive patients sometimes report disease flares during journeys by car. Window glass blocks all UVB but not all UVA. All car windscreens are made from laminated glass. Side and rear windows are usually made of nonlaminated glass. OBJECTIVES: To determine which types of glass provide most protection from UVA with particular reference to the implications for patients with polymorphic light eruption (PLE). METHODS: The percentage transmission of UVA was determined for a selection of glass, both laminated and nonlaminated, and with differing colour tints. RESULTS: Laminated glass transmits less UVA than nonlaminated glass. Tinted glass transmits less UVA than clear glass. Nonlaminated clear glass transmitted the highest percentage of UVA (62.8%) and grey laminated glass the lowest (0.9%). A dose of 5 J cm(-2) UVA, enough to trigger PLE in some patients, could be transmitted through clear nonlaminated glass in 30 min but would take 50 h through grey laminated glass. CONCLUSION: Patients with severe UVA-induced PLE and other photosensitivity disorders may have disease flares from solar UVA transmission through side-window glass. Protective measures such as wearing long-sleeved clothing, keeping the arm beneath the bottom of the window aperture, or choosing tinted and laminated car windows may be helpful. PMID: 15491429 DOI: 10./j.1365-2133.2004.06098.x = = J Long Term Eff Med Implants. 2004;14(5):415-30. Use of UV-protective windows and window films to aid in the prevention of skin cancer. Edlich RF[1], Winters KL, Cox MJ, Becker DG, Horowitz JH, Nichter LS, Britt LD, Long WB, Edlic EC. [1] De Camp Burn and Wound Healing Center, University of Virginia Health System, Charlottesville, Virginia, USA. redli...@attbi.com Abstract People are exposed to ambient solar ultraviolet (UV) radiation throughout their daily routine, intentionally and unintentionally. Cumulative and excessive exposure to UV radiation is the behavioral cause to skin cancers, skin damage, premature skin aging, and sun-related eye disorders. More than one million new cases of skin cancer were diagnosed in the United States this year. UV radiates directly and diffusely scattered by the various environmental and atmospheric conditions and has access to the skin from all directions. Because of this diffuse UV radiation, a person situated under a covering, such as the roof of a car or house, is not completely protected from the sun's rays. Because shade structures do not protect effectively against UV radiation, there have been major advances in photoprotection of glass by the development of specially designed photoprotective windows and films. It is the purpose of this collective review to highlight the photoprotective windows and films that should be incorporated into residential, commercial, and school glass windows to reduce sun exposure. Low-emittence (low-E) coatings are microscopically thin, virtually invisible, metal or metallic oxide layers
Re: [MBZ] Can ultraviolet light penetrate glass.
Even if the UV doesn't kill the virus, a mask on hot dashboard in the sun would not be hospitable for the virus due to the temperature. Might not be an instant kill but doesn't seem like an environment where it would live very long, as it doesn't seem to do well on paper or porous surfaces to begin with. Virus seems to live longest on nonporous, hard surfaces such as plastic, metal, glass, etc. Copper being an exception for some reason. If you're concerned about it, put the mask in a 200 degree oven for 15 minutes or so. Don't go too hot or you'll ruin the elastic. If you're using a bandana type of face cover, just launder it. Allan Max Dillon via Mercedes writes: > That's an interesting question. I know that most plastics will filter out the > UV. > > Max Dillon > Charleston SC > > > Apr 22, 2020 1:40:42 PM Jerry Herrman via Mercedes : > >> I did not know where to get this question answered so I decided to submit it >> to the boys at The Mercedes Digest. Somebody there surely knows the >> answer. After all, it is an automotive question, right? >> >> After wearing my COVID face mask in the car, I leave it on the dashboard so >> the sun's rays have an opportunity to kill any harmful microbes that may be >> present. Which brings up the question of whether or not the ultraviolet >> rays can penetrate glass, specifically automotive windshield glass. It is my >> understanding that to kill microbes, a wavelength of 254 nanometers is >> necessary, most of which doesn't make it to earth. So is this a useful >> practice or a fool's errand? >> >> Jerry >> >> 1982 240D >> ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Can ultraviolet light penetrate glass.
And most automotive glass is glass with plastic. Today just about all automotive glass has at least a little tint on it which would, I'd think, remove any UV. I read the other day that a mask does little to protect you from random COVID. Supposedly the mask keeps you from passing COVID to somebody else... -Curt On Wednesday, April 22, 2020, 1:54:22 PM EDT, Max Dillon via Mercedes wrote: That's an interesting question. I know that most plastics will filter out the UV. Max Dillon Charleston SC Apr 22, 2020 1:40:42 PM Jerry Herrman via Mercedes : > I did not know where to get this question answered so I decided to submit it > to the boys at The Mercedes Digest. Somebody there surely knows the > answer. After all, it is an automotive question, right? > > After wearing my COVID face mask in the car, I leave it on the dashboard so > the sun's rays have an opportunity to kill any harmful microbes that may be > present. Which brings up the question of whether or not the ultraviolet > rays can penetrate glass, specifically automotive windshield glass. It is my > understanding that to kill microbes, a wavelength of 254 nanometers is > necessary, most of which doesn't make it to earth. So is this a useful > practice or a fool's errand? > > Jerry > > 1982 240D > > > > > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Can ultraviolet light penetrate glass.
On Wed, 22 Apr 2020 10:39:56 -0700 Jerry Herrman via Mercedes wrote: > I did not know where to get this question answered so I decided to > submit it to the boys at The Mercedes Digest. Somebody there surely > knows the answer. After all, it is an automotive question, right? > > After wearing my COVID face mask in the car, I leave it on the > dashboard so the sun's rays have an opportunity to kill any harmful > microbes that may be present. Which brings up the question of whether > or not the ultraviolet rays can penetrate glass, specifically > automotive windshield glass. It is my understanding that to kill > microbes, a wavelength of 254 nanometers is necessary, most of which > doesn't make it to earth. So is this a useful practice or a fool's > errand? Sorry, Jerry, it's a fool's errand. It was tested in 2003 and that with the right kind of cars! Craig https://www.ncbi.nlm.nih.gov/pubmed/12925188/ Photodermatol Photoimmunol Photomed. 2003 Aug;19(4):175-81. UV exposure in cars. Moehrle M[1], Soballa M, Korn M. [1] Department of Dermatology, University of Tuebingen, Germany. matthias.moeh...@med.uni-tuebingen.de Abstract BACKGROUND: There is increasing knowledge about the hazards of solar and ultraviolet (UV) radiation to humans. Although people spend a significant time in cars, data on UV exposure during traveling are lacking. The aim of this study was to obtain basic information on personal UV exposure in cars. METHODS: UV transmission of car glass samples, windscreen, side and back windows and sunroof, was determined. UV exposure of passengers was evaluated in seven German middle-class cars, fitted with three different types of car windows. UV doses were measured with open or closed windows/sunroof of Mercedes-Benz E220T, E320, and S500, and in an open convertible car (Mercedes-Benz CLK). Bacillus subtilis spore film dosimeters (Viospor) were attached to the front, vertex, cheeks, upper arms, forearms and thighs of 'adult' and 'child' dummies. RESULTS: UV wavelengths longer than >335 nm were transmitted through car windows, and UV irradiation >380 nm was transmitted through compound glass windscreens. There was some variation in the spectral transmission of side windows according to the type of glass. On the arms, UV exposure was 3-4% of ambient radiation when the car windows were shut, and 25-31% of ambient radiation when the windows were open. In the open convertible car, the relative personal doses reached 62% of ambient radiation. CONCLUSIONS: The car glass types examined offer substantial protection against short-wave UV radiation. Professional drivers should keep car windows closed on sunny days to reduce occupational UV exposure. In individuals with polymorphic light eruption, produced by long-wave UVA, additional protection by plastic films, clothes or sunscreens appears necessary. PMID: 12925188 DOI: 10.1034/j.1600-0781.2003.00031.x = Go to https://www.ncbi.nlm.nih.gov/pubmed/12925188/?report=docsum for a listing of similar articles and their links: Ultraviolet radiation penetrating vehicle glass: a field based comparative study.[Phys Med Biol. 1999] Implication for photosensitive patients of ultraviolet A exposure in vehicles.[Br J Dermatol. 2004] Use of UV-protective windows and window films to aid in the prevention of skin cancer.[J Long Term Eff Med Implants. ...] Review Broad-spectrum photoprotection: the roles of tinted auto windows, sunscreens and browning agents in the diagnosis and treatment of photosensitivity. [Dermatology. 1992] Review Current status of photoprotection by window glass, automobile glass, window films, and sunglasses. These would seem to provide more and more definitive information. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Can ultraviolet light penetrate glass.
That's an interesting question. I know that most plastics will filter out the UV. Max Dillon Charleston SC Apr 22, 2020 1:40:42 PM Jerry Herrman via Mercedes : > I did not know where to get this question answered so I decided to submit it > to the boys at The Mercedes Digest. Somebody there surely knows the > answer. After all, it is an automotive question, right? > > After wearing my COVID face mask in the car, I leave it on the dashboard so > the sun's rays have an opportunity to kill any harmful microbes that may be > present. Which brings up the question of whether or not the ultraviolet > rays can penetrate glass, specifically automotive windshield glass. It is my > understanding that to kill microbes, a wavelength of 254 nanometers is > necessary, most of which doesn't make it to earth. So is this a useful > practice or a fool's errand? > > Jerry > > 1982 240D > > > > > > ___ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
[MBZ] Can ultraviolet light penetrate glass.
I did not know where to get this question answered so I decided to submit it to the boys at The Mercedes Digest. Somebody there surely knows the answer. After all, it is an automotive question, right? After wearing my COVID face mask in the car, I leave it on the dashboard so the sun's rays have an opportunity to kill any harmful microbes that may be present. Which brings up the question of whether or not the ultraviolet rays can penetrate glass, specifically automotive windshield glass. It is my understanding that to kill microbes, a wavelength of 254 nanometers is necessary, most of which doesn't make it to earth. So is this a useful practice or a fool's errand? Jerry 1982 240D ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
