Canadian Council of Independent Laboratories (CCIL) Practice Exam 2026 - Free CCIL Practice Questions and Study Guide

The standard dimensions of a strike-off bar used in testing are specifically chosen to ensure consistency and accuracy in the measurement of material, often in reference to the testing of concrete and other building materials. The dimensions of 6mm x 25mm x 450mm reflect a balance between ease of use and the material's ability to adequately level off excess material when striking off a sample or mold.

Having a standard size helps laboratory technicians to perform tests uniformly, which is essential for obtaining reliable and repeatable results across different tests and laboratories. It allows for the consistent application of pressure and technique when leveling materials, reducing variables that could lead to discrepancies in results. This particular dimension is widely recognized in standard testing procedures, aligning with industry expectations established by organizations such as the Canadian Council of Independent Laboratories (CCIL).

Other dimension options provided do not correspond to the standard recognized for strike-off bars, which is why they do not fulfill the requirements for accurate testing in this context. Maintaining consistency in testing tools like the strike-off bar helps uphold quality assurance practices in laboratory settings.