Use papers printed with heat‑resistant inks designed for use in xerographic copiers. The ink must be able to withstandtemperatures up to 230°C (446°F) without melting or releasing hazardous emissions. Use inks that are not affected bythe resin in toner. Inks that are oxidation‑set or oil‑based generally meet these requirements; latex inks might not.When in doubt, contact the paper supplier.Preprinted papers such as letterhead must be able to withstand temperatures up to 230°C (446°F) without melting orreleasing hazardous emissions.Using recycled paper and other office papersRecycled office paper produced specifically for use in laser (electrophotographic) printers may be used in your printer.However, no blanket statement can be made that all recycled paper will feed well.Generally, the following property guidelines apply to recycled paper.• Amount of post-consumer waste (We test up to 100% post-consumer waste content.)• Temperature and humidity conditions (Testing chambers simulate climates from all over the world.)• Moisture content (Business papers should have low moisture: 4–5%.)• Bending resistance and proper stiffness means optimum feeding through the printer.• Thickness (impacts how much can be loaded into a tray)• Surface roughness (measured in Sheffield units, impacts print clarity and how well toner fuses to the paper)• Surface friction (determines how easily sheets can be separated)• Grain and formation (impacts curling, which also influences the mechanics of how the paper behaves as it movesthrough the printer)• Brightness and texture (look and feel)Recycled papers are better than ever; however, the amount of recycled content in a paper affects the degree of controlover foreign matter. And while recycled papers are one good path to printing in an environmentally responsible manner,they are not perfect. The energy required to de-ink and deal with additives such as colorants and “glue” often generatesmore carbon emissions than does normal paper production. However, using recycled papers enables better resourcemanagement overall.Unacceptable paper examplesTest results indicate that the following paper types are at risk for use with laser printers:• Chemically treated papers used to make copies without carbon paper, also known as carbonless papers• Preprinted papers with chemicals that may contaminate the printer• Preprinted papers that can be affected by the temperature in the printer fuser• Preprinted papers that require a registration (the precise location on the page) greater than ± 2.3 mm (± 0.9 in.),such as optical character recognition (OCR) forms. In some cases, registration can be adjusted with a softwareapplication to successfully print on these forms.)• Coated papers (erasable bond), synthetic papers, thermal papers• Rough-edged, rough or heavily textured surface papers or curled papers• Recycled papers that fail EN12281:2002 (European testing)• Paper weighing less than 60 g/m 2 (16 lb)• Multiple part forms or documentsPaper and specialty media guide 40