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NG28 provides detailed engineering material inspection services related to building materials and construction engineering. "Electrical casing inspection: appearance mark, maximum outer diameter, minimum outer diameter, minimum inner diameter, minimum wall thickness, compressive performance, impact performance, drop performance, electrical performance (Voltage test, insulation resistance), heat resistance, bending performance, bending performance, self-extinguishing performance. Wire and cable inspection: appearance mark, average outer diameter, insulation thickness, sheath thickness, conductor outer diameter, conductor resistance, voltage Test, insulation resistance, mechanical properties before aging. Testing parameters of pipes and fittings: appearance mark, size, longitudinal shrinkage, elongation at break, drop weight impact test, Vicat test, tensile yield stress, bending degree, simple support Beam impact test, hydrostatic test, drop test, ring stiffness, oven test."