I tinted my glass because I have a big car with a lot of glass. Also, I place my two kids in the ca ...
You idea about having tinted glass to block out UV to protect anything is not correct.
All vehicle glass, if they are original parts, should block out 99%UV if they are to pass the saftey standard. Look for the words "AS-1" or "AS-2" on your glass and you will know that if they can block UV or not.
UV light is not visible to the human eye. So even if you cannot see any light at all, there can still be UV. Tinted doesn't mean UV block. Take the latest 3D technology in cinemas nowadays, you need to wear a tinted glass in cinemas in order to view the 3D movies, but look at the package, it clearly stated that these glasses, although tinted, cannot block UV, so wearing them as sunglasses actually do you more harm as your pupil will dilate and receive more UV to hurt your eyes. Therefore, tinted glasses is no use in blocking UV in cars, as the glass should have already done the job even though they are 100% clear...
This is the cached copy of http://www.td.gov.hk/filemanager/tc/content_1178/glass.pdf.
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運輸署對車輛玻璃規定作出的最新修訂(2009年12月)在香港，汽車玻璃的安全規格受《道路交通（車輛構造及保養）規例》第28條所管限。第28(1)(a)條所指的可接受準則包括《歐洲經濟委員會規例》第4 3條； 該條於2003年曾作修訂，訂明凡車外兩側配有倒後鏡的汽車，車尾玻璃的透光率可少於70%。但必須注意：符合《歐洲經濟委員會規例》第43條並不等同自動符合第28(1)(b)條的要求。《道路交通（車輛構造及保養） 規例》第28(1)(b)條規定，汽車所採用的玻璃，就透明度而言，必須不會令該汽車內部景觀不清晰。在2008年，運輸署就所有車輛類別的車窗玻璃的透光率規定作出檢討，新修訂規則如下：(i) 由2008年5月1日起，所有私家車及巴士司機座位（B支柱）後面車窗玻璃的透光率的最低規定，已放寬至44%。(ii) 由2009年5月1日起生效，對車外配有兩塊倒後鏡的所有貨車及特別用途車輛而言，其司機座位後面車窗玻璃的透光率的最低規定，亦放寬至44%。車頭擋風玻璃和司機座位兩側車窗玻璃的透光率將維持不變，即分別達75%和70%。車輛入口商、經銷商和主要的汽車維修及服務公司須注意上述修訂。
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