Can PPA plastic series directly contact concentrated acid substances?

The PPA plastic series has obvious limitations when it comes into direct contact with concentrated acid substances, and its applicability needs to be comprehensively evaluated in combination with specific conditions. Although PPA plastic itself has good chemical corrosion resistance and can withstand the erosion of weak acids, weak bases and common solvents (such as gasoline, engine oil, etc.), it has weak tolerance to strong oxidizing concentrated acids (such as concentrated sulfuric acid, concentrated nitric acid, etc.). At room temperature or low-concentration acidic environments, PPA may show a certain stability, but under high temperature or high concentration conditions, its molecular chain may break or react chemically with the acid, resulting in a significant decrease in material performance, such as deformation, surface corrosion or reduced mechanical strength. PPA has insufficient corrosion resistance to concentrated sulfuric acid and strong oxidants, and long-term contact may cause material degradation; PPA will deteriorate in strong acid and alkaline media such as concentrated sulfuric acid or concentrated sodium hydroxide. However, the stability of PPA in specific concentrated acid environments can be improved through modification technology (such as adding fluorine elements, silicon elements and other chemical corrosion resistant agents) or surface treatment (such as plating, coating). In practical applications, PPA can tolerate mixed fuels and some acidic media (such as engine antifreeze) in scenarios such as automotive fuel systems and air intake management systems, but caution is still required when it comes into direct contact with strong oxidizing concentrated acids (such as concentrated sulfuric acid in battery electrolytes). Therefore, whether to use PPA for contact with concentrated acids needs to be comprehensively judged based on the type, concentration, temperature and action time of the acid, and if necessary, it needs to rely on modification technology or auxiliary protective measures.