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Cannabis concentrates contain high THC levels that range from 40% to over 90%, [1] [2] stronger in THC content than high-grade marijuana, which normally measures around 20% THC levels. Volatile solvents, such as ethanol , butane , propane or hexane , may be used to prepare extracts, but can and will possibly lead to fire and explosion hazards ...
Dowex chelating resin A-1, also known as Chelex 100, is based on iminodiacetic acid in a styrene-divinylbenzene matrix. Dowex A-1 is available commercially and is widely used to determine general properties of chelating resins such as rate determining step and pH dependence, etc. Dowex A-1 is produced from chloromethylated styrene ...
Direct reduction processes can be divided roughly into two categories: gas-based and coal-based. In both cases, the objective of the process is to remove the oxygen contained in various forms of iron ore (sized ore, concentrates, pellets, mill scale, furnace dust, etc.) in order to convert the ore to metallic iron, without melting it (below 1,200 °C (2,190 °F)).
Pitch produced from petroleum may be called bitumen or asphalt, while plant-derived pitch, a resin, is known as rosin in its solid form. Tar is sometimes used interchangeably with pitch, but generally refers to a more liquid substance derived from coal production, including coal tar, or from plants, as in pine tar. [2]
Most coatings have four basic components. These are the resin, solvent, pigment and additive systems [5] but the resin or binder is the key ingredient. Continuing environmental legislation in many countries along with geopolitics such as oil production are ensuring that chemists are increasingly turning to waterborne technology for paint/coatings and since resins or binders are the most ...
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Cementite (or iron carbide) is a compound of iron and carbon, more precisely an intermediate transition metal carbide with the formula Fe 3 C. By weight, it is 6.67% ...
The cat's meat man (or woman) sold meat, frequently horse meat, for cats and dogs from a hand-cart. [56] [57] [58] The occupation was a type of hawker. In the late 19th century commercial cat and dog food became available and this gradually displaced horse meat as the normal diet for pets. [59] Social: 19: 20: Climbing boy