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Polystyrene Plastics Balls Polystyrene Balls Spheres float on surface of liquid in open tank and thereby greatly reduce the exposed liquid surface area - up to 90%. Dramatically diminish objectionable fumes and odors. Blanket of spheres also insulates heated liquid reducing evaporation and heat requirements. Ideal for plating tanks and similar open tank installations where the liquid surface can be covered with a blanket of spheres without impeding access to the tank for process purposes. Spheres are hollow and will float on any liquid. No welt or rim on which chemicals can deposit, and being smooth they ensure a much tighter surface cover. Polypropylene, non-toxic and able to withstand continuous working temperatures of 110° C (230°F) Polypropylene is suitable for use in most known chemicals. High Density Polyethylene generally suitable as above but with a continuous working temperature limitation of 80° C. (176° F) softening point about 110° C (230°F). High density polyethylene has better chemical resistance to certain compounds like oil, and other hydro-carbons. Also less stress cracking at low temperatures than polypropylene. Color white translucent except 100 mm, black for outside use. All sizes are blow molded. Virgin White Polystyrene Balls :   Diameter Tolerance Stock Number Hollow or Solid Balls per Pkg. Cost per Pkg Buy Now .125 ±.002" KB-215 Solid 100 $22.16 Buy Now .156 ±.002" KB-013 Solid 100 $28.00 Buy Now .188 ±.002" KB-014 Solid 100 $30.34 Buy Now .219 ±.002" KB-015 Solid 100 $35.00 Buy Now .250 ±.002" KB-016 Solid 100 $36.16 Buy Now .313 ±.002" KB-017 Solid 100 $39.66 Buy Now .375 ±.002" KB-018 Solid 100 $45.50 Buy Now .438 ±.002" KB-203 Solid 100 $48.00 Buy Now .500 ±.002" KB-019 Solid 100 $49.00 Buy Now .625 ±.002" KB-020 Solid 50 $39.66 Buy Now .750 ±.002" KB-021 Solid 25 $25.09 Buy Now .875 ±.002" KB-204 Solid 50 $38.50 Buy Now 1.00 ±.002" KB-022 Solid 10 $31.50 Buy Now Operating Temperature Range up to +150° F Note:  Shipping charges will apply to all orders, and will vary depending on Customer ship to location, pricing does not reflect shipping charges