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AC Bitumen, or Asphalt Cement graded by viscosity, is classified mainly according to absolute viscosity at 60°C under the applicable specification. Grades such as AC-10, AC-20, AC-30 and AC-40 represent different viscosity levels and should be selected according to the project standard, climate, traffic, pavement design, asphalt-mixture requirements and construction conditions. This guide explains the AC grading system, compares the main grades, reviews the differences between AC, VG, penetration-grade and PG Bitumen, and outlines quality-control, storage, purchasing and pricing considerations.

Crumb Rubber Modified Bitumen, commonly known as CRMB, is a modified asphalt binder produced by combining base bitumen with processed crumb rubber from end-of-life tyres. This guide explains CRMB production through wet and dry processes, its potential benefits and limitations, common applications, quality-control tests, storage requirements, pricing factors and differences from polymer modified bitumen.

VG Bitumen, or Viscosity Grade Bitumen, is classified according to its resistance to flow at specified laboratory temperatures. Grades such as VG10, VG20, VG30 and VG40 differ in viscosity, relative hardness, climate suitability and typical paving applications. This guide explains each grade, compares VG30 and VG40, outlines the differences between VG, penetration-grade and PG Bitumen, reviews important quality-control tests, and explains what buyers should check before requesting a quotation.