Nylon or Delrin (Acetal):
These sink in water. Very Strong.
Polypropylene and Polyethylene
Both float in water. Very light.
Polyethylene is available in both lowdensity (suffix LDPE) and high-density (suffix HDPE).
These sink but don’t absorb water.
Very heat and chemical resistant.
Crystal clear, highly polished. Invisible in water and they sink. Very pretty. Crystal cabochons (half-balls) available 1/4″ to 3″.
Very hard. Heavy metal group.
Standard sizes range from .031″ through 1.000″ and from 1mm through 5mm (not shown in chart below–please ask). Custom-made decimal sizes available.
Save money, conserve energy, reduce air and noise pollution.
They’re not only environmentally sound, they pay for themselves up to 6 times over per year. They just pour onto the surface, covering 91% in a single layer. Balls move out of the way for dipping and float back into position automatically. One layer reduces heat loss by 75% and evaporation by 87%; with two layers, reduction is 81% and 90% respectively. Hollow ball blankets are successfully used in many applications: anodizing, food processing, metal processing and finishing, sewage treatment, gas scrubbing, temperature retardation and more.