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Irwin Strait-Line

4-Ounce Blue Powder Standard Marking Chalk Refill


Please select a store to view pricing and availability.

* Estimated stock levels as of Mon, Sep 23, 2019. All items subject to prior sale. Prices may vary between stores and online. Please call ahead to confirm availablity of items marked as Limited Stock.

  • Interior or exterior use
  • Marks are temporary
  • Provides great visibility
  • Micro-fine for more marking power



Applicable Materials Wood, Drywall and Concrete
Color Blue
Composition Calcium Carbonate, Ultramarine Blue, Silica
Form Powder
Media Water, Dry Chemical, Carbon Dioxide
P H Range 8.5 - 9.5
Packing Type Plastic Bottle
Prop 65 Warning Warning WARNING: This product can expose you to chemicals which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to
Size 4 oz
Specific Gravity 2.7 - 2.71
Type Marking Chalk


Please select a store to view pricing and availability.