5. Temperature Resistance Temperature resistance refers to the change in the performance of an adhesive within a specified temperature range. It includes heat resistance (in high - temperature environments), cold resistance (in low - temperature environments), and resistance to high - low temperature variations. These temperature changes can also alter the composition of the adhesive, reducing the bonding strength until the adhesive layer detaches.
        6. Weather Resistance For bonded parts exposed outdoors, the ability to withstand weather conditions such as rain, sunlight, wind, snow, and moisture is called weather resistance. Weather resistance also reflects the aging - resistant performance of the adhesive layer under the long - term effects of natural conditions. Similarly, these natural factors can cause the adhesive layer to deteriorate in performance, affecting the bonding strength.
        7. Chemical Resistance Most synthetic resin adhesives and some natural resin adhesives will undergo different changes such as dissolution, swelling, aging, or corrosion under the action of chemical media, resulting in a decrease in bonding strength.
       8. Other Properties In addition to the several properties introduced above (i.e., the effects of various usage environmental conditions such as temperature, humidity, sunlight, and chemical media on the bonding strength of the adhesive layer, which comprehensively reflect the usage effect of the adhesive layer), which must be considered when selecting an adhesive, other properties of the adhesive should also be taken into account.For example, whether it has a pungent odor, is toxic, what color it is, its storage stability, its shelf - life, and its price.
         For adhesives used indoors, they should have no pungent odor and be non - toxic. If an adhesive with an odor must be selected, the bonded part should be used only after the adhesive layer is completely dry. Select an adhesive with a color similar to that of the adhered object or a white adhesive to avoid the adhesive's color staining the finish and affecting its decorative effect. In addition, attention should also be paid to the storage period of the adhesive, because after the storage period, the actual bonding performance of the adhesive (especially its bonding strength) will be greatly reduced, thus affecting the bonding effect. These eight technical properties of adhesives are the basic conditions for ensuring the degree of bonding!