| Author |
Message |
Lisa Goodwin Robbins, RA, CCS, LEED ap
Senior Member
Username: lgoodrob
Post Number: 198
Registered: 08-2004
| | Posted on Friday, September 14, 2012 - 01:10 pm: |    |
Which ASTM number describes the test method for determining the light reflectance value (LRV) of paint materials? |
Richard L Matteo, AIA, CSI, CCS
Senior Member
Username: rlmat
Post Number: 540
Registered: 10-2003
| | Posted on Saturday, September 15, 2012 - 10:10 am: | |
Lisa,
Sorry I couldn't respond sooner, I was at Construct all week.
The closest I could find is - ASTM C609 - 07 Standard Test Method for Measurement of Light Reflectance Value and Small Color Differences Between Pieces of Ceramic Tile |
Lisa Goodwin Robbins, RA, CCS, LEED ap
Senior Member
Username: lgoodrob
Post Number: 199
Registered: 08-2004
| | Posted on Tuesday, September 18, 2012 - 09:38 am: | |
Thanks, but I don't think that's what the paint manufacturers use for LRV testing. ASTM E 1477 is for LRV on acoustic panels too. Isn't there something specific for painted surfaces? I'm hoping to hear back from our painting reps. |
Richard L Matteo, AIA, CSI, CCS
Senior Member
Username: rlmat
Post Number: 541
Registered: 10-2003
| | Posted on Tuesday, September 18, 2012 - 01:45 pm: | |
Lisa - I received the following from my Sherwin-Williams Rep.:
ASTM D2244, “Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates." |
John Bunzick, CCS, CCCA, LEED AP
Senior Member
Username: bunzick
Post Number: 1443
Registered: 03-2002
| | Posted on Tuesday, September 18, 2012 - 02:34 pm: | |
One problem for architectural coatings (other than the high-performance types) is that the manufacturers don't like to share testing, even what standards they are testing to. I looked at the list of ASTM standards and specifications that the paint committee (or whatever they call themselves) is responsible for, and it's a lot. But good luck getting any of them to share it with you.
What's your situation/problem that you're trying to solve? |
Bruce Maine
Senior Member
Username: btmaine
Post Number: 10
Registered: 03-2011
| | Posted on Tuesday, September 18, 2012 - 02:47 pm: | |
The Master Painter's Institute discusses ASTM method D 523 and how that applies to LRVs. http://www.paintinfo.com/mpi/approved/sheen.shtml
Bruce Maine CDT LEED AP |
Lisa Goodwin Robbins, RA, CCS, LEED ap
Senior Member
Username: lgoodrob
Post Number: 200
Registered: 08-2004
| | Posted on Wednesday, September 19, 2012 - 10:28 am: | |
Thank you all for your help. Here's the longer story, my client is painting cellular PVC trims at the exterior which requires high LRV paints. The painter is using a different paint manufacturer than the one the Architect selected, so the custom mixed colors need to be tested for LRV.
One manufacturer says: "We use the Y value (from Tristimulus XYZ values) for D65 10 illuminant for LRV, where the values are for standards that are read on a spectrophotometer with 0/45 (bidirectional) geometry. I don't know if there is an ASTM for that, but your customer should be able to understand the above."
Second manufacturer says: Test with a nanometer scale; utilize the x, y, and z factors as a percentage of R.
Yes, I think the Architect should go back and select from the pretested colors.
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