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  2. Concrete sealer - Wikipedia

    en.wikipedia.org/wiki/Concrete_sealer

    Topical sealers can provide visual enhancement as well as topical protection from stains and chemicals. They require a dry, clean surface during application to gain adhesion. Topical sealers may alter the coefficient of friction which can make substrates slick when wet – a condition that can be remedied by adding anti-skid materials.

  3. PPG Industries - Wikipedia

    en.wikipedia.org/wiki/PPG_Industries

    PPG was also the world's first plate glass plant to power its furnaces with locally produced natural gas, an innovation which rapidly stimulated widespread industrial use of the cleaner-burning fuel. [3] PPG expanded quickly. By 1900, known as the "Glass Trust", it included 10 plants, had a 65 percent share of the U.S. plate glass market, and ...

  4. Polypropylene glycol - Wikipedia

    en.wikipedia.org/wiki/Polypropylene_glycol

    [11] [12] Another use of PPG is as a surfactant, wetting agent and dispersant in leather finishing. [13] PPG is also employed as a reference and calibrant in mass spectrometry and HPLC. [14] [15] PPG and derivatives may be used as defoamers in drilling and other applications. [16] [17] It is also used as a primary ingredient in the making of ...

  5. Hermetic seal - Wikipedia

    en.wikipedia.org/wiki/Hermetic_seal

    A hermetic seal is any type of sealing that makes a given object airtight (preventing the passage of air, oxygen, or other gases).The term originally applied to airtight glass containers but, as technology advanced, it applied to a larger category of materials, including metals, rubber, and plastics.

  6. PPG - Wikipedia

    en.wikipedia.org/wiki/PPG

    PPG Industries, a U.S. manufacturer, formerly known as Pittsburgh Plate Glass PPG Place, its office complex; Polypropylene glycol, a polymer; Post-prandial glucose, a measure of blood sugar after a meal; Pounds per gallon, a measure of density, typically of a fluid. It is common in the oil industry, especially as a unit for Mud weight.

  7. Glass-to-metal seal - Wikipedia

    en.wikipedia.org/wiki/Glass-to-metal_seal

    Uranium glass used as lead-in seals in a vacuum capacitor. Glass-to-metal seals are a type of mechanical seal which joins glass and metal surfaces. They are very important elements in the construction of vacuum tubes, electric discharge tubes, incandescent light bulbs, glass-encapsulated semiconductor diodes, reed switches, glass windows in metal cases, and metal or ceramic packages of ...

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