Generally speaking, the acrylic adhesive will have higher adhesion at mid-range temperatures (0°C to 100°C), but silicone adhesives have higher adhesion at lower temperatures (under 0°C) and higher temperatures (above 100°C). This adhesion is independent of the tape thickness (1mil, 2mil or 5mil) as the adhesive layer thickness remains constant. This is substrate dependent and other variables can come into play, but this is a good rule of thumb.
Silicone-based adhesives are certainly more standard, but sometimes the customer needs acrylic because they cannot have silicone in their systems, need higher adhesion at mid-range temperatures or other specific reasons.
Visit caplinq.com to learn more about both our Polyimide films without adhesive, or our Polyimide tapes with acrylic or silicone adhesive. You can also contact us if you have further questions on whether you require a polyimide tape with silicone adhesive, or a polyimide tape with acrylic adhesive.