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Let’s first understand the performance differences between acrylic adhesive protective film and silicone adhesive protective film.
Most PET protective films we use are silicone-based. Compared to acrylic adhesive PET films, silicone-based PET films have a wider range of applications. For example, PET protective films used extensively for smartphone screens are typically silicone-based, as silicone adhesive can withstand higher temperatures than acrylic adhesive.
Acrylic adhesive protective films are mainly used for packaging high-gloss products and membrane switches. They are affordable and practical.
Silicone adhesive protective films, on the other hand, are ideal for glass surfaces or high-gloss products, as they provide air release functionality. They also have better high- and low-temperature resistance than acrylic adhesives, though they come at a slightly higher price.
Die-cutting manufacturers can choose the appropriate type of protective film based on their specific application needs.
So how can we distinguish between acrylic and silicone adhesive protective films when we receive a PET film?
- By scratching the adhesive side with a fingernail:
- If no residue or powder is produced, it's silicone adhesive (also known as powder-free adhesive).
- If white powder or glue residue appears, it's acrylic adhesive.
- By smell:
- Silicone films are odorless and colorless, while acrylic films have a noticeable smell.
- By burning the film:
- Silicone film turns gray, while acrylic film melts into a liquid state.
Additional differences between PET silicone adhesive films and PET acrylic adhesive films:
- Tackiness:
- Acrylic adhesives are more tacky and tend to leave residue after removal.
- Silicone adhesives are less tacky and usually leave no residue.
- Bubble formation:
- Silicone films adhere quickly with little or no air bubbles.
- Acrylic films adhere more slowly and are more likely to trap air bubbles.
- Transparency:
- Acrylic adhesive films have better transparency than silicone ones.
- Temperature resistance and smoothness:
- Silicone adhesives offer better temperature resistance, smoother adhesive surface, and excellent low-temperature performance.
- Acrylic adhesives are easier to produce, more transparent, cheaper, offer better weather resistance, and stronger adhesion.