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Hardened

Process of treating a cellulose paper to increase its strength.

FAQ
Hardened paper is the process of treating a cellulose paper to increase its strength.
There are three methods manufacturers can use to increase wet strength:
  1. Increasing paper thickness: Improves strength, but very thick paper is highly absorbent and can be difficult to wash.
  2. Treating with mineral acid: Removes trace metals (improving purity), producing a tough paper with a hard surface.
  3. Adding a stable synthetic resin: Suited for non-critical applications as the resin can affect critical analyses.
Hardened filter papers produce high wet strength and chemical resistance.
The tough surface makes these filters suitable for a wide range of critical filtration procedures.
These filters are particularly suitable for Buchner filtration where the tough, smooth surface of the filter makes it easy to recover precipitates.