Improve workplace safety and efficiency with Avery 4" x 2" NFPA Secondary Container Labels. Preprinted with an NFPA diamond, each label also includes checkboxes for personal protective equipment requirements. Handwritable with ballpoint pens and permanent markers, these labels work perfectly with Avery Marks A Lot UltraDuty markers to make sure both your labels and writing stay legible and won't smear. Designed for the harshest conditions, these BS5609 Sec. 2 certified labels were tested in seawater for 90 days to ensure top-quality adherence. Along with being waterproof, these labels are also resistant to chemicals, abrasion, UV rays, tearing and harsh temperatures. Designed for every jobsite, these labels are built to last the harshest conditions both indoors and outdoors and are great for chemical bottle labels, hazardous chemical labels, chemical labels and more. The minimum application temperature for these labels is 10 f and the adhesive service temperature range is -20 f to 220 f. Please Note: These labels are handwrite-only and are not designed to be compatible with laser or inkjet printers.