Abstract： AS 1618:2003 pdf download.Dimensions and preferred sizes for refractory bricks. 8.4 APPARATUS 8.4.1 Measuring rule A flexible steel rule not exceeding I m in length. graduated and marked in millimetres. A fixed or sliding hook consisting of...

AS 1618:2003 pdf download.Dimensions and preferred sizes for refractory bricks.

8.4 APPARATUS

8.4.1 Measuring rule

A flexible steel rule not exceeding I m in length. graduated and marked in millimetres. A fixed or sliding hook consisting of a

right-angled piece of hardened steel shall be placed at the end of the rule to fix the point of the scale against the end of the

brick being nieasured. The hook shall not extend more than 6 mm at right angles to the plane of the rule (see Figure III). The

flexibility of the rule shall he such that effective contact may be niade with both edges of a brick having a maximum convexity of 6 mm in 300 mm without the hook becoming disengaged.

In case of dispute. the accuracy of the measuring rule shall he determined by a suitable testing body (see Note).

NOTE: Laboratories certified under an accreditation scheme registered with the Joint Accreditation System for Australia and New

Zealand arc capable of conducting such tests.

8.4.2 Straightedgcs

Complying with the requirements of AS 1003.

8.4.3 Hardened steel wedge

Having a hardness value of not less than 500 HV. The sloping face of the wedge shall be clearly and legibly marked at points

indicating the thickness of the wedge at that point in increments of each 2.5 mm by lines extending completely across the face.

Each of these increments shall be further sub-divided into five equal parts and indicated by divisions extending halfway across the face.

Details of the wedge and the method of marking are shown in Figure 82.

8.4.4 Hardened steel blocks

Two hardened steel blocks having a hardness ralLIe of not less than 500 HV. Each block shall be 25 mm long and 12.5 mm square. and have a medium machine finish.

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