Crisping sleeve

Hot Pockets, popular microwaveable products that utilize crisping sleeves

A crisping sleeve is intended for use in a microwave oven to crisp and brown food items placed within it.

Crisping sleeves consist generally of paperboard affixed with a susceptor that absorbs microwaves and converts them to heat. The purpose of the susceptor is to apply additional heat to a specific portion of the food, browning it. The paperboard is also often used as a rigid container to support the food items within.^[1]

They are generally intended for a single use.^[2]

References

1. ^ US patent 4775771, Thomas D. Pawlowski et al, "Sleeve for crisping and browning of foods in a microwave oven and package and method utilizing same", published October 4, 1988, issued October 4, 1988 
2. ^ "Products FAQs @". Hotpockets.com. http://www.hotpockets.com/products/faqs/index.aspx. Retrieved 2010-10-19.