Bitumen: Grades and Method of Grading


In this post, we will discuss 5 types of bitumen grades and the method of grading bitumen.

Grades of Bitumen.

Bitumen is graded in 5 types.

  1. Penetration grade bitumen – Bitumen 60/70 is commonly used as the major Penetration Grade Bitumen.
  2. Oxidised bitumen grade – These types of bitumen are custom made for projects and they are highly water resistant and durable. They are available in many grades like 95/25, 85/25, 75/25, 90/40 and 115/15.
  3. Cutback bitumen – These types of bitumen are produced by diluting in petroleum hydrocarbon (Kerosene).Commonly available cutback bitumen are MC-30 and MC-70.
  4. Bitumen Emulsion – There are three types of grades, Rapid setting (RS), Medium setting (MS), and Slow setting (SC).
  5. Polymer Modified bitumen – PMB polymer modified bitumen grades are PG 64–16, PG 64–22, PG 70–10, PG 70–16, PG 76–10, PG 76–16.

Methods of Grading Bitumen

There are mainly four methods used for grading of bitumen.

  1. Grading by chewing – Before scientific testing methodologies were invented bitumen was tested by chewing to determine the hardness of the material. It was done by experts and their word was taken at face value.
  2. Penetration grading – The American Society for Testing Materials (ASTM) tested bitumen quality using penetration of a needle which has 100g of bitumen at a temperature of 25-degree Celsius in a water bath for a period of 5 seconds.
  3. Viscosity grading – This method was used to grade bitumen based on the viscosity of the material.
  4. Superpave performance grade – Superpave system was invented to avoid ravelling, fatigue cracking and thermal cracking of bitumen during the testing process. The higher grades are PG 52, PG 58, PG 64, PG 70, PG 76 and PG 82. The lower grades are -4, -10, -16, -22, -28 and -34.
A veteran Amazon reviewer and best budget home product writer. His work has also appeared in numerous publications. His articles are featured in Medium & Quora.

More from author


Please enter your comment!
Please enter your name here

Best Discounts

Latest posts

25 Best Hand Wash in India for Clean Hands

Want great hand washes for your hands and skin. We listed the best liquid handwashes in India and top selling hand washes in Amazon. Read below to know the 25 Best Hand Wash in India.

What to look for when buying an air conditioner in India

An air conditioner is a worthy asset to remove the struggles with the summar heat. What to look for when buying an air conditioner in India.

10 Best Iron Plant Stand (Indoors and Outdoors) in India

We found the best iron plant stand you can buy online. Featuring 10 Best Iron Plant Stands (Indoors and Outdoors) in India at budget prices.

12 Best Video Doorbells and Video Door Phones in India

Are you looking for wireless video door phone with wifi or video door bells. Here are 12 Best Video Doorbells and Video Door Phones in India.

14 Best Budget Planner Books To Save Money in India

Are you looking for budget planner book and monthly planner with budget pages. Here are 14 Best Budget Planner Books To Save Money in India.

10 Best Curtain Rods in India

Best curtain rods are essential when you are furnishing your home. Here are 10 Best Budget Curtain Rods for Bedroom, living room and Home.

10 Best Toilet Seat Sanitizer Spray in India

Toilet disinfectant sanitizer spray is a must for a clean home. Here are the 10 Best Toilet Seat Sanitizer Spray in India for clean bathroom.

Want to stay up to date with the latest news?

We would love to hear from you! Please fill in your details and we will stay in touch. It's that simple!