A chemical substance is any material with a definite chemical composition, no matter where it comes from. Hill, J. W.; Petrucci, R. H.; McCreary, T. W.; Perry, S. S. General Chemistry, 4th ed., p5, Pearson Prentice Hall, Upper Saddle River, New Jersey, 2005. For example, a sample of water has the same properties and the same ratio of hydrogen and oxygen whether the sample is isolated from a river or made in a laboratory. A pure substance cannot be separated into other substances by any mechanical process,Ebbing, D. D.; Gammon, S. D. General Chemistry, 7th ed., p12, Houghton Mifflin, Boston, Massachusetts, 2002.. Typical chemical substances found in the home are water, salt (sodium chloride) and sugar (sucrose). Generally, substances exist as solid, liquid, or gas, and may change between these phases of matter with changes in temperature or pressure.
The concept of chemical substances was established in the eighteenth century by the chemist Joseph Proust. He did careful studies of the composition of some pure chemical compounds such as basic copper carbonate Hill, J. W.; Petrucci, R. H.; McCreary, T. W.; Perry, S. S. General Chemistry, 4th ed., p37, Pearson Prentice Hall, Upper Saddle River, New Jersey, 2005. He deduced that: "All samples of a compound have the same composition; that is, all samples have the same proportions, by mass, of the elements present in the compound". This became known as the law of constant composition, and it is one of the foundations of modern chemistry.

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BNT Chemicals GmbH - Manufactures alkyl chlorides and tin chlorides, as well as various organo-tin compounds and tin-based catalysts. Located in Germany.
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C Chemicals Inc. - Manufacturer and distributor of industrial chemicals in Georgia, USA. Products include inorganic and organic acids, salts, and solvents. Also offers custom blending of dry materials.
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Guangzhou Tinci High-Tech Material Co., Ltd. - Produces chemicals for the personal care and organosilicon industry in China, including surfactants, modified cellulose and guar gum, water soluble or dispersible organosilicones, and preservatives, as well as several fine-chemical intermediates and vinylene carbonate for battery applications.
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Henan Hongye Chemical Company Ltd. - Large-scale producer of thiourea dioxide, sodium percarbonate, and other bleaching agents in China. Other products include furfuryl chemicals, titanias, and anthraquinone.
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