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Author Topic: What is 'plate glass'? Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-15-2004 11:40 AM                     Steve, It doesn't really much matter how they make the stuff, they might do it an other way entirely than plate or float. Why don't you write to PPG and find out and let us all know, but how its made wouldn't deter me from using it. Its the best alternative to ground optical glass you can get. If the application is really critical then the Schneider porthole glass would be the prefered choice. Its made from the same ground optical plate they use to make camera filters. Mark  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 08-15-2004 12:27 PM                     Schneider's glass is greener than PPG Starphire Steve  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-15-2004 01:54 PM                     Don't know... have never compared them side by side. I was told by Dwight that they used the same glass that was used for making photographic filters. It had better be clear stiuff as they'll eventually have many big time cinematographers using theor filters really pissed at them. If this is not the case I'd certainly like to know as I'll have more of the PPG stuff sent out for coating. Mark @ CLACO  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 09-04-2004 01:07 PM                     Here is a side by side photo of two pieces of two edge ground glass plates. Its actually easier to tell with edge ground which glass is the more transparent. A polished edge does not allow it to be as obvious so to say. The white edge is the Schneider port glass and the darker one is Diamante "starphire" glass which is the German equivelent to PPG Starphire. First off I would say thet the Diamante is no where near as clear as real PPG Starphire glass is and I am still awaiting a sample of actual Starphire from PPG. Our local distributer switched over to the Diamante glass very recently and claims that its clearer but I can tell you with out a doubt that he's lying. Its probably just cheaper or he has a greater profit margin. I also somewhat doubt Steve G's claim that PPG Starphire is clearer than the Schneider stuff. The Starphire is going to be a touch pale blue while the Schneider will remain white. A real side by side comparison is upcomming in a week or so as soon as the PPG sample arrives. When the PPG sample arrives I will compare four types of glass on edge in sunlight, all the same thickness. PPG Starphire, Diamante Starphire, Standard Plate and Schneider AR. Also here is a site with alot of interesting reading on various types of high end glass available. http://www.pgo.com/ Mark @ CLACO  |  IP: Logged System Notices Forum Watchdog / Soup Nazi Posts: 215 Registered: Apr 2004 posted 08-02-2010 11:20 AM                 It has been 2157 days since the last post.  |  IP: Logged Eric Robinson Jedi Master Film Handler Posts: 538 From: Santa Rosa, CA Registered: Jan 2005 posted 08-02-2010 11:20 AM                     I was doing some research on the topic and found some info to clarify the issue of ground or float for Starphire. PPG Starphire by PGO PPG - Starphire Description: Starphire float glass is a crystal clear soda-lime glass product. Its high visible light transmission and brilliant edge are two characteristics unique to Starphire glass. This glass has a low iron composition with mechanical and physical properties similar to ordinary clear soda-lime glass. According to some optical measurement data I reviewed, the optical glass called Pilkington Optiwhite Float is even better.  |  IP: Logged Paul Gordon Jedi Master Film Handler Posts: 580 From: Ottawa, Ontario, Canada Registered: Aug 2005 posted 08-02-2010 12:29 PM                        Can't you just use optical glass from an old computer scanner? Theres piles of them in used electronic stores and landfills  |  IP: Logged James Westbrook Phenomenal Film Handler Posts: 1133 From: Lubbock, Texas, Usa Registered: Mar 2006 posted 08-02-2010 03:17 PM                     We just had some retrofit DCI compliant port windows installed in my building. The entire window is optical glass. Oddly the new glass has a dark tint to it BUT the pictures on screen are noticeably sharper and brighter. I am not sure who made them.  |  IP: Logged

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