Is PNA usually a yellow powder or crystals? What are its melting and boiling points?

How stable is the quality of Chinese-made MAA (such as Wanhua and Rongxin) in the international market? How does it compare to Röhm or Mitsubishi?

Why does 4-nitroaniline sublimate easily? What special requirements are there for storage and packaging?

When purchasing Methacrylic Acid MAA, what are the differences in inhibiting dimer formation between 100ppm MEHQ and 250ppm MEHQ specifications?

What are the sensitization and toxicity levels of PNA? What are its specific risks to the human blood system (such as methemoglobinemia)?

For a customer with an annual consumption of 500 tons, is it more cost-effective and safer to build stainless steel storage tanks or use ISO tanks for direct feeding?

Is PNA a 'highly polluting, high-environmentally-risk' product? What are the current global restrictions on its discharge into industrial wastewater?

What percentage of the price of methacrylic acid is affected by fluctuations in raw material costs for the ACH process (acetone cyanohydrin process) and the C4 process (isobutylene process)? Which suppliers can provide recommendations on the optimal ratio of Methacrylic Acid MAA in high-performance polycarboxylate superplasticizers?