Under the International Mobility Management Group (IMDG) standards, what class of dangerous goods does 4-nitroaniline belong to?

When importing Methacrylic Acid MAA, in addition to the COA and MSDS, is it necessary for the supplier to provide test records showing the degradation of the polymerization inhibitor content over time?

In specific synthetic routes, are there safer and more environmentally friendly alternatives to 4-nitroaniline?

What is Ascent Petrochem's supply history for methacrylate products? Does it have formal REACH registration to ensure EU customs clearance?

What are the differences in impurity composition between PNA produced by the ammonolysis of p-nitrochlorobenzene and the nitration of acetanilide?

During peak shipping seasons, what is the typical lead time for booking Methacrylic Acid MAA, a dangerous good, from Chinese ports to Hamburg or Busan ports?

Is there a significant difference in color uptake between 99.0% industrial-grade PNA and 99.5%+ refined-grade PNA when synthesizing high-grade disperse dyes? What are the typical contents of common isomer impurities in PNA (such as 2-nitroaniline)? How do they affect the color of the final product?

If the received Methacrylic Acid MAA has partially polymerized (resulting in turbidity), what are the internationally accepted sampling, sealing, and independent third-party testing procedures?