It is an important sulphide of sodium.  It is widely used in leather industry for removing hairs from the hide.   It finds extensive applications in textile and also synthetics of sulphur dyes and reduction of amino compounds.  It is also used in  paper industry, lothogrraphy and engraving manufacture of sulphur black dyes etc.

There was no production of sodium sulphide in India before the   war,   all the  requirements  being  met   from   imports.  Arrangements  for  the  import  of  sodium  sulphide  failed  and considerably  difficulty  was  experienced  by  the  textile  and terming  industries in meeting the requirements of  the  defense serious   for textiles and leather.  The question  of  developing the  sodium  sulphide  industry in India became  urgent  and  was immediately  taken  up.   Shortly  before  that  time   extensive deposits  of  sodium  sulphate  from  which  sodium  sulphide  is manufactured.   The  smaller  producers  either  obtained  sodium sulphate  which left over as a by-product in the  manufacture  of bichromates or hydrochloric and nitric acids or Rayon industries, as  in most foreign countries.  There was no control over either production of sodium sulphide or its distribution or its price during war time.

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The same Biscuit is made up form the word ‘BIS’ Which means twice and ‘Cut’ means Balled suggesting that product should be twice balled. The Biscuit were originally developed to meet the requirement of longer life of the barley products and for this, purpose, the dough were made up and twice balled to make them moisture free to improve their keeping qualities. The Biscuit manufacturing was started a century ago mainly to meet the requirement of European Travelers. The industry was located near the sea port but today we have a large number of factories situated in various parts of the country. Producing best quality biscuitse quivalent to international standards.

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Commercial production of superabsorbent polymers began in Japan in 1978, for use in feminine napkins. This early superabsorbent was a crosslinked starch-g-polyacrylate. Polyacrylic acids eventually replaced earlier superabsorbents, and is the primary polymer employed for superabsorbent polymers today.1 In 1980, European countries further developed the superabsorbent polymer for use in baby diapers. This first diapers employing this technology used only a small amount of polymer, approximately 1-2 g. In 1983, a thinner diaper using 4-5 grams of polymer and less fluff was marketed in Japan.

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Another  class of organic liquids used in paint industry  is plasticizers their function is to remain permanently in the  film of  paint  or  varnish  after  application  in  order  to  impart elasticity  and proper adhesion to it.  In contradiction  to  the volatile solvents, plasticizers should be perfectly non-volatile, and should also be chemically stable, and not after in properties on prolonged exposure.

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Solvent  or  thinners  are used in paints  and  lacquery  to reduce   the  viscosity  or  consistency  of  the  material   and facilitate  the  application of a uniform coating. They  must  be compatible  with the oil or resin present. After application  the solvent  is  no longer required and should  evaporate  completely from the film.

A solvent is a liquid which disperses a solid or  semi-solid substance so as to yield a useful solution.

Petroleum  Naphthas, or solvents; have been available  since the commencement of the petroleum industry. They are valuable as solvent non-poisonous character, good dissolving  power,  and favourable  cost. The wide range of naphthas available  from  the ordinary paraffinic straight-run to the highly aromatic types-and the  varying  degree  of  volatility  possible,  offer   products suitable for many uses.

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Solvents  or Thinners are used in Paints and lacquers to reduce   the  viscosity  of  consistency  of  the  material   and facilitate  the application of a uniform coating.   They must  be compatible with the oil or resin present.   After application the solvent  is  no longer required and should  evaporate  completely from the film.

Another  class of organic liquids used in paint industry is  plasticizers their function is to remain permanently  in  the film  of  paint or varnish after application in order  to  impart elasticity  and porper adhesion to it.   In contradistinction  to the  volatile  solvants,  plasticizers should be  perfectly  non-volatile,  and should also be chemically stable, and not after in properties on prolonged exposure.

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A  solvent is a liquid which disperses a solid or semi  solid substance so as to yield a useful solution.

The application of a solvent or thinner in the production of paints  or  varnishes is highly essentials in order  to  obtain a useful solution.  In the solution formation dispersion of  solids to liquid phase takes place.  Example the addition of linseed oil to  hexane, to glycericles present in the oil disperse forming  a viscous solution.

A wide range of solvents possessing specific properties  are now used in formulations containing synthetic resins.   According to  their boiling range, solvents are classified as  low  boilers (B.P.<  100oC)  medium boilers (B.P. 100-120o), and  high  boilers (B.P.) 150o.

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N.C.  THINNER  is  a mixture  of  esters,  glycol,  alcohol, aromatic  solvents  and ketones suitable diluents  to  all  nitro products.  It is manufactured for reducing lacquers  before  they are applied by different methods.

Solvents  or  Thinners are used in Paints  and  lacquers  to reduce   the  viscosity  or  consistency  of  the  material   and facilitate  the  application of a uniform coating. They  must  be compatible  with the oil or resin present. After application  the solvent  is  no longer required and should  evaporate  completely from the film.

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Solvents  or  Thinners  are used in Paints  and  lacquers to reduce   the  viscosity  or  consistency  of  the  material   and facilitate  the application of a uniform coating.  They  must  be compatible with the oil or resin present.  After application  the solvent  is  no longer required and should  evaporate  completely from the film.

Another  class of organic liquids used in paint industry  is plasticizers their function is to remain permanently in the  film of  paint  or  varnish  after  application  in  order  to  impart elasticity  and proper adhesion to it.  In contradiction  to  the volatile solvents, plasticizers should be perfectly non-volatile, and should also be chemically stable, and not after in properties on prolonged exposure.

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