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PEI (Polyethermide) High strength and heat resistance (up to 340° F) allows the polymer to perform consistently in high temperature environments. When used in a 3D printing application, PEI is excellent because it can withstand the numerous heat cycles that a 3D print bed goes through from print to print. Polyetherimide has a natural Amber(yellow-orange) color and comes in different grades. Ultem 1000 is the standard, unfilled grade. It is inherently flame resistant and low in smoke production. TABLE TOP FLAT Best practices for 3D printing is to have a build platform that is level and flat. Many manufacturers cut their PEI sheets from larger rolls. This causes the sheets to have a bow and curve to them, which isn't ideal for printing. FYSETC PEI is cut derectly from large flat sheets of PEI, this allows for the dimensional sheets level to be table top flat. PROTECTIVE FILM Be aware that there is protective film on both sides of the PEI sheet. These need to be removed prior to use. Film is colored clear for your convenience. Best Method to Attach: Remove them from both sides before using: clear protective film guards against scratches during shipping and handling. These need to be removed prior to use. Step 1: use 3M 468MP adhesive transfer tape, the adhesive is heat resistant and provides a strong bond. This method provides the most level print surface. Step 2: Tear off the protective film on one side. The other method is to use small binder clips (2 per side minimum). This method provides the flexibility to remove the print bed. Package includes: 1x 7.8" x7.8" PEI Sheet(with 3M 468MP Adhesive backing) After Sales Guarantee: each one defective item can have the free replacement or refund. If you have any issue or good suggestion, please feel free to email or Q&A us. We are always here for you.