Believe in Progress,
Achieve Success

As a creative and agile Iranian holding in the bitumen industry, DEJPA is among the first three producers in Iran with an export market, focusing on the field of bitumen and mulch. It is also known as a leading company in the field of technical and engineering services in the oil refining, bitumen and mulch industry, and it has made successful entries in the field of oil refining as business opportunities for the coming years.
Taking the lead in gaining market share in the current chain through increasing productivity, intelligence and innovation in supply, production and sales methods, as well as entering the oil refining chain in order to learn and build strategic capacity for the future of business.
43 YEARS OF COUNTINUES ACTIVITY IN BITUMEN PRODUCTION.
 
Latest blogs
more blogs
How to Read a Bitumen Certificate of Analysis (COA): A Practical Guide to Specifications, Standards, and Discrepancies

How to Read a Bitumen Certificate of Analysis (COA): A Practical Guide to Specifications, Standards, and Discrepancies

A bitumen Certificate of Analysis should be reviewed beyond a few apparently acceptable numbers. This guide explains how to verify product and batch identity, test methods, units, specification limits, actual results, laboratory information, and internal consistency while distinguishing a COA from a TDS and SDS.
June 27 2026 More
What Are the Main Bitumen Quality Control Tests? Penetration, Softening Point, Ductility, Viscosity, and Flash Point

What Are the Main Bitumen Quality Control Tests? Penetration, Softening Point, Ductility, Viscosity, and Flash Point

Bitumen quality cannot be evaluated only by its grade name. Penetration, softening point, ductility, viscosity, flash point, solubility, and aging tests each examine a different aspect of binder consistency, thermal behavior, safety, purity, and durability. This article explains how these tests are performed, interpreted, and reviewed in a bitumen Certificate of Analysis.
June 24 2026 More
What Is Cutback Bitumen? Differences Between RC, MC, and SC Grades and Their Applications

What Is Cutback Bitumen? Differences Between RC, MC, and SC Grades and Their Applications


Cutback bitumen is produced by blending base bitumen with a petroleum solvent to temporarily reduce viscosity. Based on the solvent evaporation and curing rate, it is classified as rapid-curing RC, medium-curing MC, or slow-curing SC. This article explains the differences, applications, benefits, limitations, safety considerations, quality-control tests, and comparison with bitumen emulsion.
June 22 2026 More