4 октября, 2015 
Pokraskin Polystyrene is a low-cost commodity plastic and is available in three main categories:
• Crystal polystyrene,
• High-impact polystyrene (HIPS), and
• Expanded polystyrene (EPS).
Crystal polystyrene is an amorphous polymer with superior clarity but generally lower impact strength than polycarbonate. HIPS is a toughened grade with reduced optical clarity. EPS is a low-density foam and so is very widely used as a packaging material or as an insulating material.
Crystal polystyrene and HIPS can usually be bonded with most engineering adhesives although polystyrene can be susceptible to stress cracking by some activators, primers and accelerators.
EPS is not easy to bond and is attacked by many adhesives although hot melts can show good results.
In these trials [2], the cyanoacrylate primer showed an improvement in bond strength but in many applications HIPS can be bonded with cyanoacrylates satisfactorily
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without the need for primer (Table 2.16). HIPS is often opaque and so UV acrylics may not be suitable if this is the case.
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