Most of a dragonfly's life is spent in the larval stage where it molts from six to fifteen times. Depending on altitude and latitude, larval development varies from the common one or two years to as many as six years.
HOME. OPS (Biaxially Oriented Polystyrene Sheet) is a thermoformable sheet produced by stretching polystyrene in two directions, lengthwise and crosswise. OPS can be used widely for transparent containers such as lids, trays, and foldable food containers because it has high transparency, rigidity and hygiene.Manufacturing Process of OPS Applications of OPS Most of OPS are used for food packaging containers such as food packs, trays, lids and fruit containers.PS can be used widely for transparent containers such as lids, trays, and foldable food containers because it has high transparency, rigidity and hygiene. Manufacturing Process of OPS Applications of OPS Most of OPS are used for food packaging containers such as food packs, trays, lids and fruit containers.
Polystyrene foams are good thermal insulators and are therefore often used as building insulation materials, such as in insulating concrete forms and structural insulated panel building systems. Grey polystyrene foam, incorporating graphite has superior insulation properties.