The procedures described here allow evaluation of heat resistance, water resistance, and cold resistance of the adhesive used in glued lap joints.

Not every adhesive formulation will require a given level of performance in each of these environments. One should select the applicable evaluation process(s) from this method based on the environmental conditions the container will be subjected to.

Some acid dyes, e.g., Acid Yellow 23, Acid Yellow 36, and Acid Blue 9, cannot be evaluated by the beater dying method. However, the other acid dyes, basic dyes, and direct dyes may be evaluated by this method.

For testing absorbent paper or materials such as blotting, toweling, tissues, or beer mat stock, use TAPPI T 432 – Water Absorbency of Bibulous Papers.

for testing harder sized sheets, see TAPPI T 441 – Water Absorptiveness of Sized (Non-bibulous) Paper, Paperboard, and Corrugated Fiberboard (Cobb Test).

This method is useful for sheets treated with such materials as a stearic chrome complex, polyvinylidine chloride, polyvinyl compounds, commercial varnishes, paraffin wax impregnations, and paraffin wax coatings. The sheet may be produced directly on the paper machine or subsequently coated.

The method is not practical for plastic extrusion coatings, heavily wax-coated, not certain curtain-coated grades which have a hard wax/resin type of coating, for which the test period becomes prohibitively lengthy.

In general, packaging materials used for storage at -18°C should be capable of protection against an appreciable loss of moisture for periods up to 1 or 2 years. The final selection of materials for such storage is probably best done by actual package storage tests for the full length of time required. This method is a simplified and rapid method which has been shown to give results indicative of behavior during long-term storage. Many of the packaging materials are based on cellulose, including paper, paperboard, cellophane, and glassine. The time required for these materials to reach moisture equilibrium when exposed at -18°C may be several weeks or months. The assumption is made in this procedure that equilibrium is reached, for practical purposes, in the 7-day initial conditioning period.

This test is intended to supplement TAPPI T 454 "Turpentine Test for Voids in Glassine and Greaseproof Papers" and TAPPI T 507 "Grease Resistance of Flexible Packaging Materials."