Heavy Duty Polyester (B-837) plastic tags are encapsulated in matte polyester laminate for superior durability during lockout and tagout situations. Write-on polyester laminate protects the graphics, wipes clean and withstands water, grease and extreme temperatures. Durable heavy duty polyester material with brass grommets exceeds OSHA's 50 lb pull force requirement for tagout devices. Excellent chemical, oil and water resistance. Service temperature of -40°F to 176°F (-40°C to 80°C).