To judge whether the inoue foam is corroded by chemicals, we can start from the following aspects:

Appearance changes:

-Color change: If the original color of the foam changes, such as fading, discoloration and spots, it may be corroded by chemicals. For example, exposure to strong oxidizing chemicals may make the color of foam lighter or yellow; If you come into contact with some colored chemical reagents, you may get the corresponding color.

-Surface texture change: The surface texture of normal well foam is relatively uniform. If it is corroded by chemicals, its surface may become rough, bumpy, blistering, peeling and cracking. For example, contact with organic solvents may cause the surface coating or material of foam to be dissolved, resulting in uneven surface.

-Changes in size and shape: Chemical corrosion may cause expansion, contraction and deformation of foam. If the size of foam changes obviously or its shape becomes distorted during storage or use, it may be affected by chemicals. For example, after the foam comes into contact with acidic or alkaline substances, a chemical reaction may occur, resulting in changes in its structure, thus causing changes in its size and shape.

Physical performance changes:

-Elasticity change: Inoue foam has certain elasticity, which can be quickly restored to its original state after being pressed by hand. If it is corroded by chemicals, its elasticity may be reduced, and the recovery speed after pressing will slow down, or even it will not be able to return to its original shape. This is because chemical substances destroy the molecular structure of foam and reduce its elastic properties.

-hardness change: the hardness of foam with moderate hardness may change after chemical corrosion. For example, when it comes into contact with some softener chemicals, foam will become soft; When it comes into contact with some chemicals that will cross-link and cure the material, the foam may become hard.

-Density change: Chemical corrosion may cause the internal structure of foam to change, so the density will also change. Generally speaking, if the density of foam increases or decreases obviously, it is necessary to consider whether it has been corroded by chemicals.

Odor change: normal well foam may have a slight smell of raw materials, but if it is corroded by chemicals, it may produce a pungent and unpleasant smell. For example, after contact with some volatile chemicals, foam will absorb the odor of these substances, or produce new irritating odor in the process of chemical reaction.

Chemical test: If there is doubt about whether the foam is corroded by chemicals, some simple chemical tests can be carried out. For example, using pH test paper to detect the pH value of foam surface, if the pH value is quite different from the normal range, it may be corroded by acidic or alkaline chemicals; Or soak the foam in some common solvents to see if it will dissolve and swell, but this method may cause further damage to the foam, so it needs to be used with caution.