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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.

PG Bitumen, or Performance Grade Bitumen, is a performance-based system for classifying asphalt binders according to their expected behavior at high and low pavement temperatures. This article explains how grades such as PG 64-22 are interpreted, how PG Bitumen differs from penetration-grade and polymer-modified bitumen, where it is commonly used, which laboratory tests support performance grading, what affects its price, and what information buyers should provide before ordering.

Proper bitumen sampling is essential for reliable quality-control results because laboratory testing is only meaningful when the sample accurately represents the storage tank, tanker, transfer line, or shipment. Clean and dry containers, correct sampling location and timing, temperature and batch records, labeling, sealing, retained samples, and chain of custody are key requirements. This article explains bitumen sampling from tanks, tankers, and transfer lines, common sampling errors, sample handling, and the main controls required before laboratory testing.