The Seven Most Common Grades for Chemicals and Reagents
With seven different and inequivalent types of chemical purity grades, it is crucial to understand how they can impact products. Using a lower-purity grade than a product’s intended use requires could be a costly mistake. Similarly, using a higher-purity grade when not required could result in unnecessary costs.
API | Diesel Exhaust Fluid (DEF) - American Petroleum Institute
Diesel exhaust fluid (also referred to as DEF or AUS 32) is injected into the diesel exhaust stream and the heat from the exhaust, the fluid, and a catalyst convert the NOx into the harmless gases. Diesel exhaust fluid is a 32.5% solution of technically pure urea in purified water. For the SCR unit to operate properly, the DEF must meet an
Difference Between DOA And DOS - News - Zhejiang Jiaao Enprotech Stock
Difference Between DOA And DOS. Cold-resisting plasticizer DOA and DOS are common. Main difference is cold-resisting level. DOA use into PVC soft products,cold-resisting level from 0 to -25 degree. DOS use into PVC soft products,cold-resisting level from -26 to -39 degree. PVC products cold-resisting limit is - 39 degrees Celsius.
Gasoline explained - octane in depth - U.S. Energy Information
In recent years, car manufacturers have been requiring or recommending premium gasoline (a high-octane grade of fuel) for use in more of their vehicle models. The difference in prices between premium and lower octane grades has also increased. Octane ratings are measures of fuel stability.
Silver standards
The coin silver standard in the United States was 90% silver and 10% copper, as dictated by US FTC guidelines. However, in silversmithing, coins could come from other nations besides the United States, and thus coin silver objects could vary from 750 millesimal fineness (75% silver) to 900 (90% silver).
