Heavy paper backing, with medium softness, flat sanding surface and small extension. Suit for making various kinds of belts and specialty abrasives.

重型纸基砂带，具有适中的柔软度，砂面平整、延伸率小，适合做各种砂带、砂卷和异型制品。

youdao

The flat devices are integrated with a polyester backing familiar from stick-on tattoos.

FORBES: Electronic Devices Packaged in Synthetic Skin

At the landfill's flat and dusty summit, a dozen bulldozers and graders swarm every day, backing and turning and mashing and shaping.

WSJ: Grappling With a Garbage Glut