Benzoyl Peroxide and Di-tertiary-Butyl Peroxide. Why buy ours?
Because Reichhold offers more shipping points from coast-to-coast for prompt delivery service. And, because RCI polymerization catalysts are produced in glass-lined equipment under the most rigidly controlled conditions in order to assure highest product quality. BENZOYL PEROXIDE (C 6 H 5 CO) 2 0 2
DI-TERTIARY-BUTYL PEROXIDE (CH 3 ) 3 COOC(CH 3 )3 Properties
Properties RCI Code
46-707 Granules
46-717 Wet Granules
46-718 Wet Granules
RCI Code
46-719
Color Benzoyl Peroxideicontent Active Oxygen Decomposition point
White
White
White
Assay
97% min.
Active oxygen content
10.6% min.
Color
Clear, water white
Specific gravity, 25°C.
0.79
Refractive index, 25°C.
1.387
96% min. 6.3% min. 103°tol05°C.
74 to 80% 65 to 70% 4.0 to 5.3% 4.3 to 4.6%
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Benzoyl Peroxide is used to catalyze various synthetic resins and monomers: polyesters, silicones, acrylics, vi nyls, styrene, etc. Wet granules reduce flammability and shock sensitivity hazards usually associated with the dry product and work especially well in emulsion and suspension type polymerizations. Because of the reduced hazards of the wet granules, the I.C.C. permits shipments in larger packages than the i-pound standard required for dry granules. RCI offers the wet product in i-lb., 5-lb., and ίο-lb. (net dry weight) containers.
Viscosity, 25°C.
0.8 cps
Flash point
Below 80°F.
Boiling point, 760 mm Hg
111°C.
Melting point
-40°C.
Di-tertiary-Butyl Peroxide, an especially stable liquid, is formulated for use as a high temperature polymeriza tion catalyst for a variety of olefins and vinyl monomers (e.g. ethylene and styrene). Especially suited for styrenated alkyd production.
Many polymer producers are presently enjoying the superior service and quality associated with RCI catalysts. Are you? If not, contact your nearest RCI Sales Representative for complete information on any or all of our polymerization catalysts. Or, write to Reichhold Chemicals, Inc., RCI Building, White Plains, N . Y . 10602.
REICHHOLD 8
C&EN
Do you need new glasses... or Mallinckrodt thin layer sorbents? A change to Mallinckrodt SilicAR® sorbents is like getting a new set of eyes. Spots sharpen. Clarity improves. Uniform results become a matter of course. The uniformity of Mallinckrodt silicic acid is legend. Our purity specifications excel the standards of comparably priced sorbents. And, further, we provide tight control of organic contaminants— the source of greyness on charred plates, contamination at the solvent front and other TLC troubles. Few sorbents offer this control. There's an additional advantage in our fluorescent sorbents. The phosphors emit white light instead of green, resulting in superior uv visualization. The photos at left compare the same sample on a green plate (top) and our white plate (bottom) under uv. If you haven't been seeing spots like you should, don't blame your glasses. Blame your "specs." Order a supply of SilicAR sorbents from your Mallinckrodt distributor. For product data write Dept. TLC
Mallinckrodt
MALLINCKRODT CHEMICAL WORKS St. Louis, Missouri 63160 C&EN
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