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  Hygroscopic Plastics By Jim Hingst Outgassing: Problems Arising Out Of Thin Air Some plastics can absorb moisture from the air.  These materials fall into the category called “hygroscopic plastics”.  The best known product in this group is  polycarbonate . It’s not, however, the only  hygroscopic  plastic. Nylon and polyester can also absorb water vapor. Water vapor isn’t the only substance that polycarbonate sheet can absorb.  Researchers have discovered that polycarbonate can also become saturated with oxygen.  While absorption of moisture and oxygen isn’t always a problem, it can be, especially when you are decorating the sheet with vinyl graphics. As the plastic outgases, bubbles can form under the applied vinyl graphics.  Polycarbonate can absorb moisture and oxygen from the air. As the plastic outgases, bubbles can form under the applied graphics.  Moisture in polycarbonate sheet is also an issue for sign makers, who are  th...

  High-Density PolyEthylene (HDPE) or PolyEthylene High-Density (PEHD) is a polyethylene thermoplastic made from petroleum. It takes 1.75 kilograms of petroleum (in terms of energy and raw materials) to make one kilogram of HDPE. HDPE is commonly recycled, and has the number "2" as its recycling symbol. Polyethylene pipes both High Density (HDPE) and Medium Density (MDPE) can carry potable water, wastewater, slurries, chemicals, hazardous wastes, cables and compressed gases as well as oils. Polyethylene pipes have a long and successful service experience to the gas oil, mining and water utility industries. PE pipes have the lowest repair frequency per Kilometer of pipe per year compared with all other pipe materials used for urban water and gas distribution. Properties HDPE has little branching, giving it stronger intermolecular forces and tensile strength than lower-density polyethylene. It is also harder and more opaque and can withstand somewhat higher temperatures (120 °C...

  Different Types of Barricade Tapes Hsb   Wednesday, June 24, 2015   Caution Tapes ,  Different Types of Barricade Tapes ,  Fire Hazards Tape ,  Physical Hazards Tape ,  Specified Barricade Tape Colors ,  Traffic Warning Tapes   3 Comments Over the last few decades life has changed a lot and now there is a solution to every possible problem. Warning Tapes, have been in use for decades now and one can easily act as a sign of prohibition. These  Caution Tapes  are designed in such a way that they are able to grab the attention of people on the very first go. The place confined within the tapes should be avoided by the general public at any cost. However, different types of tapes are used for different purposes and so one has to be very careful while making a choice. OSHA and ANSI provide precise specification for barricade tape colors. These are found in OSHA regulations. OSHA-Specified  Barricade Tape Colors Red / White for Fir...