Storage jars are used for collecting and storing solids, specimens, pastes and lab supplies. Plastic jars provide good clarity while their straight sides allow for full-access and complete sample removal. Polypropylene plastic jars usually autoclavable and can withstand a wide temperature range, making them excellent for cold room and refrigeration, while polystyrene plastic jars offer glass-like quality with chemical resistance to household oils and solvents, aqueous products, acids, alcohols and alkalis.