What is the glass transition temperature ($T_g$) of HPA? What kind of flexibility does it exhibit during film formation?

What is the skin irritation rating of HPA? Is it a restricted substance under the Montreal Protocol or any specific environmental list?

Besides coatings, what role does HPA play in the manufacture of hydrophilic contact lens materials?

How significant is the risk of self-polymerization of HPA at room temperature? Why do light and moisture accelerate its deterioration?

What are the specific differences in hydrolysis resistance and hydrophobicity between hydroxypropyl acrylate (HPA) and hydroxyethyl acrylate (HEA)?

How does replacing hydroxypropyl methacrylate (HPMA) with HPA in UV curing systems change the curing rate and shrinkage? What is the upper limit for diacrylate content in industrial-grade HPA? Will high diacrylate content cause a "jelly" (gel) phenomenon during resin production?

List global manufacturers that can stably supply low-acid-value, low-color HPA and assess their logistical coverage in the Asia-Pacific region.