Plastics

Most plastic housewares are either- thermoplastic or thermosetting plastic.

THERMOPLASTICS

Kitchen storage items and food preparation utensils are examples of thermoplastics which include rigid or flexible polyethylene, nylon, vinyl and acrylics.

In the manufacturing process, heat and pressure are applied to dry materials in a mold. The finished product melts when re-subjected to heat, making thermoplastics unsuitable for cooking utensils. In fact, these items should never be left near an open flame of a hot stove where they may come in contact with direct heat. However, containers made of "boilable plastic" can be taken directly from the freezer and dropped into boiling water.

Some thermoplastics are rugged enough to withstand severe weather extremes and the constant battering that trash and garbage cans take. These are found in plastic cans that are lighter weight than good metal cans and won't crack, dent, warp or rust.

THERMOSETTING PLASTICS

During manufacturing, thermosetting plastics become hard and brittle with the application of heat and pressure. The product retains its rigid form regardless of subsequent applications of heat. Melamine, phenolic, urea, plastic-laminated and fiberglass-reinforced materials are made this way.

Thermosetting plastics are primarily used for appliance knobs and handles, bottle caps, radio and TV cabinets, laminated countertops and melamine dinnerware. Probably the most familiar use is for heat-resistant handles on metal cookware.

Although thermosetting plastics are not affected by moderate heat, you should not inadvertently leave a detachable pot handle or melamine dinner plate near intense or direct heat. While they will not melt like thermoplastic, they may warp.

CARE POINTERS

Plastics-even the best-should be washed with a mild soap or nonabrasive cleaner. Abrasive cleaners and scouring pads may permanently mar the finish. Solvents and liquid cleaners may etch the finish of some plastics, notably polystyrenes.

Today, many plastics are "boil- proof" or safe for washing in an automatic dishwasher, but you should still read the manufacturer's fact tag or label before washing the item.

MARKS OF QUALITY

Virgin plastic is one big quality difference. Less expensive products may be made from reclaimed plastic, which may dry out and crack-virgin plastic won't. Better quality is apparent in weight of the item and thickness of walls, sides and bottoms. Also, look for a snug seal in lids.

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Check your state and local codes before starting any project. Follow all safety precautions. Information in this document has been furnished by the North American Retail Hardware Association (NRHA) and associated contributors. Every effort has been made to ensure accuracy and safety. Neither NRHA, any contributor nor the retailer can be held responsible for damages or injuries resulting from the use of the information in this document.