resin grade

Bakelite is made from phenol and formaldehyde in the presence of a base catalyst. It involves formation of methylene bridges at the ortho and para positions. The reaction starts with the initial formation of ortho and/or para-hydroxymethyl phenol derivatives which further react with phenol to form ..

Giant organic molecules having acidic or basic groups are known as Ion-exchange resins. Acid resins contain the acid group (- COOH). Basic resins contain the basic group [(-NH )OH - ], i.e., substituted ammonium hydroxide group. Acid and basic ion exchange resins..

Reactant in the manufacture of formaldehyde resins like bakelite and galalith by catalytic condensation with phenol or casein (milk protein). The resin can be moulded while hot into different shapes under pressur..

After some time, the resins require regeneration as they become ineffective. Adding a strong acid regenerates acid resin and the basic resin is regenerated by treating it with a solution of a strong base. The regenerated resins are washed to remove Ca ..

It is prepared by placing a layer of transparent plastic (sheet of vinyl acetate resin) between two layers of glass and sealing the layers with adhesive..

The chemically uncreative nature of ethers and the low cost of ethoxythane make it an important ether. Ethoxy ethane is a solvent for oils, gums, resins etc and is used as an inhalation anaesthetic. But now it is widely replaced due to unpleasant effect..

Static electricity was known to people more than 2500 years ago. The Greeks knew about the attractive property of the resin amber. They knew that by rubbing amber with cloth, it could be made to attract small feathers. The Greek name for amber was 'elektron..

In rare cases, the entire organism may be preserved. This may happen if the dead bodies of the organisms have been frozen into ice during glaciations, encased in hardened resin or tar or trapped in acidic bogs (bogs are marshy areas where acidic conditions prevent any bacterial or funga..

antiseptic and germicide preservative for biological and anatomical specimens substitute for tanning in leather industry - This is because it can harden glue or gelatine and thus renders them insoluble in water reactant in the manufacture of formaldehyde resins like bakelite ..