Q1: Why is an adhesion primer necessary for PET substrates before coating or printing?
A: PET surfaces are inherently low in surface energy and chemically inert, making it difficult for coatings and inks to form strong bonds. This primer modifies the surface chemistry, significantly increasing wettability and creating active sites for adhesion, which prevents peeling, cracking, or delamination in demanding conditions.

Q2: In which applications is PET adhesion primer most critical?
A: It is essential for high-performance PET films and sheets used in flexible packaging, electronic displays, medical device coatings, automotive components, and durable labels where long-term adhesion under mechanical stress, humidity, or chemical exposure is required.

Q3: Are there specific application guidelines to ensure optimal primer performance on PET?
A: For best results, surface pretreatment (e.g., corona, plasma, or flame treatment) is often recommended to further enhance primer bonding. The primer should be applied uniformly and allowed to dry/cure fully (via thermal or UV methods as specified) before applying subsequent layers. Compatibility with downstream coatings should be verified through testing.