Testing                                                                                                                                 MOISTURE CONTENT

Moisture Content

  General 

The conditioned specimen is weighed and heated to a constant weight to expel moisture. The difference between two weighing gives the moisture content. This method applied to all paper, paperboard and paper products except Those containing significant quantities of materials other than water that are volatile at 103±2°C. When it is required to find the moisture content of paper as received, the samples shall not be conditioned.

  Apparatus

Weighing Container - Either a wide-mouth, glass-stoppered weighing bottle, approximately 65 mm in height and 45 mm in diameter, or for larger specimens, a metal or any other air-tight container, preferably provided with a removable wire mesh basket, and of such a size as to accommodate the specimens without their being tightly packed.

Thermometer - Accurate to within 1 deg and having a range of 0 to 150°C

Drying Oven - Constant-temperature, equipped with means of ensuring adequate temperature control and free access of air.

NOTE - There Is danger of local overheating if the samples are exposed to direct rays of unshielded heating elements.

Chemical Balance - Sensitive to 1 mg for weighing specimens of 2 g and less and to 0. 05 percent of the original weight of the specimen for larger specimens.

Desiccators - Anhydrous alumina (indicating grade) is the most suitable desiccant. Calcium chloride and calcium sulphate are unsatisfactory.

  Calculation

Calculate the moisture content as-percentage on original weight of the material as follows:

                                                                        100 W-w

Moisture content, percent by weight = -------------

                                                            W

where

W = original weight of the Conditioned specimen before drying,

  Report

  Precision

Copyright © 2001 Indosoftnet Solutions & Consultant. All rights reserved.  | Terms of Use | Feedback  Best view in 800 X 600 resolutions