Search results
Results From The WOW.Com Content Network
CR-39 plastic has an index of refraction of 1.498 and an Abbe number of 58. CR-39 is now a trade-marked product of PPG Industries. [2] An alternative use includes a purified version that is used to measure ionising radiation such as alpha particles and neutrons. Although CR-39 is a type of polycarbonate, it should not be confused with the ...
Port of sale Abu Bukhoosh 31.6° 2.0% Total Abu Al Bukhoosh Dubai: Abu Al-Bukhoosh Agbami 47.5° 0.044% Chevron: Nigeria: offshore Undisclosed Undisclosed Undisclosed Genel Energy/CPC Taiwan Somaliland: Central Somaliland oil fields Aktobe 41.6° 0.73% Kazakhstan: Novorossiysk: Al Shaheen 26.51° 2.49% North Oil Company (Qatar) Qatar: Mesaieed ...
CR-39 is commonly used in the manufacturing of plastic eyeglass lenses. Ammonia was in short supply after the end of World War II; Columbia-Southern was expected to begin producing the chemical in late 1954. [ 7 ]
According to the U.S. Geological Survey, bitumen is further distinguished as extra-heavy oil with a higher viscosity (i.e., resistance to flow): "Natural bitumen, also called tar sands or oil sands, shares the attributes of heavy oil but is yet more dense and viscous. Natural bitumen is oil having a viscosity greater than 10,000 cP."
Lenses sold in the US must pass the Food and Drug Administration ball-drop impact test, and depending on needed index these seem to currently have "best in class" Abbe vs Index ( N d): Glass (2× weight of plastics) or CR-39 (2 mm vs. 1.5 mm thickness typical on newer materials) 58 @ 1.5, Sola Spectralite (47 @ 1.53), Sola Finalite (43 @ 1.6 ...
A typical fluid catalytic cracking unit in a petroleum refinery. Fluid catalytic cracking (FCC) is the conversion process used in petroleum refineries to convert the high-boiling point, high-molecular weight hydrocarbon fractions of petroleum (crude oils) into gasoline, alkene gases, and other petroleum products.
Low vibration resistance. Light copper color. Maximum service temperature 149 °C (intermittently 204 °C). 91.5: 2: 6.5: Cu 91.7 Ag 1.5 P 6.8: Cu–Ag–P 643/799 [23] – Silvalite. For copper, brass and bronze. Self-fluxing on copper. Also usable on silver, tungsten, and molybdenum. Primarily for copper-to-copper joining. Low resistance to ...
Synthetic base oil (by far the most used one): industrial and automotive lubricants. [ 12 ] Polyolefins are used for blow moulded or rotationally moulded components, e.g. toys, [ 13 ] for heat-shrink tubing used to mechanically and electrically protect connections in electronics, [ 13 ] and for rash guards or undergarments for wetsuits.