Testing                                                                                                                                                WAX PICK NUMBER

Wax Pick Number

General

Waxes -The Dennison standard paper testing waxes are available in a series with graded adhesive powers. The complete series consists of 18 waxes from 2A to 26A, the adhesive strength increasing with the number. Equivalent waxes may be used if available.

Procedure

Place the test specimen on a smooth surface, such as a hardwood block or a table. The surface should not be a good conductor of heat, and it should not be artificially cooled before the test. The sample sheet should be separated from the block or table by 8 to 10 sheets of paper.

Select a wax stick and be certain that the end is clean and flat. Heat the end over an alcohol or low gas flame, rotating slowly until several drops of melted wax have fallen. Take care that the wax does not catch fire.

Quickly place the melted wax end on the surface of the specimen, with firm, bid not undue, pressure and withdraw the fingers immediately Allow 15 minutes for the wax to cool.

Place a wooden block with a hole over the wax stick, with the stick protruding through the hole in the block. Press the down firmly with one hand and with the other pull the wax stick from the sheet with a quick jerk at right angles to the paper surface.

Examine the end surfaces of the wax stick and the specimen. Repeat the test using waxes in advancing numerical order, until sample surface blisters, breaks, picks or lifts.

Record as wax pick number, the highest numbered wax which does not disturb the surface of the board.

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