If we want retroreflectivity as well?? - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #21 of 40 Old 02-13-09, 05:41 AM
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Re: If we want retroreflectivity as well??

Well, guys, I asked 3M in Sweden politely that I am a entuthiast that would like to test a theory. Where can I buy your diamond grade retroreflective sheeting?

Directly I got a number to a company selling traffic signs, and he had no problems of letting me buy material from him. I admit I had to pretend I was representing a one man company that "had an idea". The diamond grade sheeting I could get for $50/m (1,20m wide) if I wanted.

Im sure that if I asked him for a can of the paint, he would not say no. The trick is not to try to buy from the monster (3M) directly, but rather via aone of their large customers.

Honestly, I spend 4-5 hours just reading their product data sheets. Man, do they know optics or not

Have you seen their rear projection screen? I am drewling...
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post #22 of 40 Old 02-13-09, 06:59 PM
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Re: If we want retroreflectivity as well??

Anyone look here?

I haven't really looked at this, Tryg mentioned it.

http://www.amesresearch.com/reflect.htm

Buying more cheap stuff to get better sound is like challenging a dragon with a pocket knife.
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post #23 of 40 Old 02-14-09, 07:55 AM
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Re: If we want retroreflectivity as well??

There were no motives behind it, someone asked for some reflective paint after scrubbing a blotch in a Da-Lite HP screen, and he said that he didn't know, but that maybe try this"".

I haven't seen the new gain readings, looking forward to them.
I will say that I have a DL HP on the way.
Each of my bulbs have > 3k on them, and I am not buying another bulb, but I will be buying a new PJ sooner or later.
The HP will give me another option as far as which PJ I get, I'll have the BW and the HP....I think I'll have it covered!!

Buying more cheap stuff to get better sound is like challenging a dragon with a pocket knife.
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post #24 of 40 Old 02-14-09, 11:56 AM
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Re: If we want retroreflectivity as well??

Ok, I wont give up,

How about the famous Photoblocker?
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post #25 of 40 Old 02-14-09, 12:24 PM
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Re: If we want retroreflectivity as well??

Quote:
robert_1967 wrote: View Post
Ok, I wont give up,

How about the famous Photoblocker?
I never heard of that product before. It's an interesting idea, but for our purposes I think it is too retro-reflective. I just wish it was water-based and sold by the quart.
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post #26 of 40 Old 02-14-09, 04:26 PM
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Re: If we want retroreflectivity as well??

Quote:
custard wrote: View Post
the smallest bead size i can see on the site is 65 microns which is probably larger than what we need.
Smaller beeds than 50 microns? What are you looking for? Glass powder?

50 microns is veeeryy small beed imo. Thats 50 one-million parts of a meter. How large are the beeds you test here in this thread?
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post #27 of 40 Old 02-14-09, 05:00 PM Thread Starter
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Re: If we want retroreflectivity as well??

the 400 mesh used for sieving of the clear beads would mean they would not be larger than 38 microns.

but mech compared them to his dalite HP sample which reportedly uses 9 micron beads and they looked similar in size under the scope
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post #28 of 40 Old 02-14-09, 09:57 PM
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Re: If we want retroreflectivity as well??

I think a product that might be of some interest to you guys would be Nano Glass and the like. Here's a link to an interesting Silica Nano powder that can be added to a liquid medium.
http://www.abcnanotech.com/02e_en.php
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post #29 of 40 Old 02-14-09, 10:39 PM
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Re: If we want retroreflectivity as well??

Thanks for the link Anthony!
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post #30 of 40 Old 06-10-09, 05:34 AM Thread Starter
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Re: If we want retroreflectivity as well??

finding a source for the glass beads has been an issue.

a company sent me a sample of the glass beads today which are in the sub 50 micron range.
this material looks like something you would find in an hourglass timer and feels like flour.

i took a photo at an angle with flash on to check whether they retroreflect.
and they do...


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