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Sampling <br /> • Twenty markers selected at random will constitute a representative sample for each lot of markers. <br /> • The lot size shall not.exceed 25 000 markers. <br /> Tolerances <br /> • Three test specimens will be randomly selected from the sample for each test and tested in conformance with these <br /> specifications. Should any one of the 3 specimens fail to conform with the requirements in these specifications,6 additional <br /> specimens will be tested. The failure of any one of these 6 specimens shall be cause for rejection of the entire lot or shipment <br /> represented by the sample. <br /> • The entire sample of retroreflective pavement markers will be tested for reflectance. The failure of 10 percent or <br /> more of the original sampling shall be cause for rejection. <br /> Section 85-1.04, "Non-Reflective Pavement Markers,"of the Standard Specifications is amended to read: <br /> 85-1.04 Non-Reflective Pavement Markers <br /> • Non-reflective pavement markers (Types A and AY) shall be, at the option of the Contractor, either ceramic or <br /> plastic conforming to these specifications. <br /> • The top surface of the marker shall be convex with a gradual change in curvature. The top,bottom and sides shall <br /> be free of objectionable marks or discoloration that will affect adhesion or appearance. <br /> • The bottom of markers shall have areas of integrally formed protrusions or indentations, which will increase the <br /> effective bonding surface area of adhesive. The bottom surface of the marker shall not deviate more than 1.5 mm from a flat <br /> surface. The areas of protrusion shall have faces parallel to the bottom of the marker and shall project approximately one mm <br /> from the bottom. <br /> The second through fourth paragraphs of Section 85-1.04A, "Non-Reflective Pavement Markers (Ceramic)," of the <br /> Standard Specifications are deleted. <br /> The table in the fifth paragraph in Section 85-1.04A, "Non-Reflective Pavement Markers (Ceramic)," of the Standard <br /> Specifications is amended to read: <br /> Testing <br /> • Tests shall be performed in conformance with the requirements in California Test 669. <br /> Test Test Description Requirement <br /> a Bond strength 4.8 MPa,min. <br /> b Glaze thickness 180 lim,min. <br /> c Hardness 6 Moh,min. <br /> d Luminance factor,Type A,white markers only, 75,min. <br /> lazed surface <br /> e Yellowness index,Type A,white markers only, 7,max. <br /> lazed surface <br /> f Color-yellow,Type AY,yellow markers only. Pass <br /> The chromaticity coordinates shall be within a <br /> color box defined in CTM 669 <br /> Compressive strength 6700 N,min. <br /> h Water absorption 2.0%.max <br /> i Artificial weathering,500 hours exposure, 20,max. <br /> _yellowness index <br /> Section 85-1.0413, "Non-Reflective Pavement Markers(Plastic),"of the Standard Specifications is amended to read: <br /> 85-1.04B Non-Reflective Pavement Markers(Plastic) <br /> • Plastic non-reflective pavement markers Types A and AY shall be, at the option of the Contractor, either <br /> polypropylene or acrylonitrile-butadiene-styrene(ABS)plastic type. <br /> Contract No. 10-OM7104 <br /> 61 <br />