Ivor and Olive Lewis on sat 8 mar 08
Does anyone have information about the Yellow Chromium Oxide advertised =
by U.S. Pigment Co.
No description on their web page. Not listed in the chemical information =
pages in CRC Handbook or Kaye and Laby. Could this be a soluble salt =
such as Sodium Chromate.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
John Britt on sat 8 mar 08
Ivor,
I don't know what they are selling but I do know that chrome yellow is a
paint pigment. I think they use it in highway lines?? Not sure though.
Someone else may know for sure.
I Googled this: Chrome Yellow is a chromate of lead, and is similar to
the lead salt PbCrO4 that occurs naturally as the mineral crocoite. It is
obtained synthetically as a yellow crystalline powder by precipitation
from a solution of a lead salt (such as lead nitrate) and sodium chromate
or sodium dichromate, and is used as a pigment either alone or in
admixture with other compounds. Synthetic chrome yellow pigments are among
several bright pigments with good hiding power that vary from light
greenish yellow to reddish medium yellow, consisting essentially of normal
lead chromate usually without extenders (such as barite or clay) but often
other lead compounds (such as lead sulfate) for the lighter shades.
You might just email them?
John Britt
Ivor and Olive Lewis on sun 9 mar 08
Well friends,
I followed John Britt's advice and received the following information =
from U.S Pigment Corporation .
I think John was spot on the money.
Thank you to Syed for this prompt response.
Ivor Lewis.
Redhill,
South Australia.
<
We sell materials to other industries also, like paint & coating, =
Rubber, plastic, electronics, etc. This material is used in paints. Here =
is the brief description of Chrome Yellow.
Lead Chrome Yellow=20
Molecular formula: PbCrO4=20
Color Index No.: P.Y.34=20
Composition: lead chromate and silica coating materials=20
Characters:=20
1.It has good heat, acid and alkalis resistance, and light fastness, =
easily dispersed.=20
2.It is prepared by the precipiation of chromate salt with lead nitrate =
solutions with special surface treatment of silica, aluminum and other =
additives. The pigment particles of the treated chrome yellow are coated =
with a layer of encapsulated protective coating, so the pigment =
properties are greatly improved, and it is suitable for many industrial =
applications.=20
3.It has a clean bright color, with outstanding weather resistance and =
light fastness. The product can withstand over 200 C.Deg , under such =
temperature the color would not change. The coated pigment can easily =
dispersed in paint, printing ink, rubber and plastics media, with good =
chemical resistance. As compared with ordinary chrome yellow, it =
contents less soluble lead, and conformed with many safety regulations, =
reduces the environmental hazard. It can be used in heat fusion road =
paint, which have special demand on weather, chemical resistance and =
light fastness.=20
Sincerely,
Syed >>
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