Tuesday, September 11, 2007
Polyerethane
Via Wikipedia
Over three quarters of the global consumption of polyurethane products is in the form of foams, with flexible and rigid types being roughly equal in market size. In both cases, the foam is usually behind other materials: flexible foams are behind upholstery fabrics in commercial and domestic furniture; rigid foams are inside the metal and plastic walls of most refrigerators and freezers, or behind paper, metals and other surface materials in the case of thermal insulation panels in the construction sector. Its use in garments is growing: for example, in lining the cups of brassieres. Polyurethane is also used for moldings which include door frames, columns, balusters, window headers, pediments, medallions and rosettes.
- Polyurethane materials are commonly formulated as paints and varnishes for finishing coats to protect or seal wood.
- Polyurethane is also used in making solid tires. Modern roller blading and skateboarding became economical only with the introduction of tough, abrasion-resistant polyurethane parts.
- Polyurethane is also used in furniture manufacture for casting soft edges around table tops and panel that are stylish, very durable and prevent injury. These are used in school tables, hospital and bank furniture as well as shop counters and displays.
- Much of the foam used in chairs, couches, Comfy Sacks and mattresses is polyurethane foam.
- Flexible and semi-flexible polyurethane foams are used extensively for interior components of automobiles, in seats, headrests, armrests, roof liners and instrument panels.
- Polyurethane has been used to make several Tennis Overgrips such as Yonex Supergrap, Wilson Pro Overgrip and many other grips.
- Often electronic components are protected from environmental influence and mechanical shock by enclosing them in polyurethane.
- Polyurethane is used as an adhesive, especially as a woodworking glue.
- Polyurethane is used as a black wrapping for timepiece bracelets over the main material which is generally stainless steel. It is used for comfort, style, and durability.
- Gorilla Glue
After a period of 700 days, no aromatic amines were detected using gas chromatography mass spectroscopy, according to William E. Brown, who headed the study. Nor was any physical breakdown of the polyurethane foam cubes evident from visual inspection after the buckets were taken apart following the experiment.
Today's summary: I bought two kinds of tea at Vital Tea Leaf: one came in foil, the other in plastic (which mimicked the foil packaging). I bought a pound of chicken and a pound of bacon, both of which were wrapped only in paper.
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