Flash & Fire Point Test of Bitumen
(Pensky-Martens Closed Cup)

Determination of the flash point and fire point of bituminous materials — critical safety parameters indicating the temperature at which bitumen vapours ignite, ensuring safe heating during road construction.

Overview

What is the Flash & Fire Point Test of Bitumen?

The Flash Point is the lowest temperature at which bitumen vapour ignites momentarily when a small flame is applied. The Fire Point is the temperature at which the vapour continues to burn for at least 5 seconds. These parameters are critical safety parameters for bitumen handling, storage and application during road construction.

Conducted as per IS 1209 (Pensky-Martens Closed Cup) and ASTM D92 (Cleveland Open Cup), flash and fire point testing ensures that bitumen is not heated beyond safe temperatures at the hot mix plant, bitumen boiler or distributor — preventing fire accidents. Minimum flash point of 220°C is required for VG grade paving bitumens per IS 73.

Safety Critical Test

Mandatory IS 73 requirement — prevents bitumen overheating fires at hot mix plants.

Pensky-Martens & Cleveland Cup

Both closed and open cup methods available per project specification.

Minimum 220°C Verification

IS 73 minimum flash point for VG grades confirmed.

Digital Temperature Control

Precise heating rate and temperature measurement per IS 1209.

NABL Certified Reports

All results on NABL-accredited letterhead per IS 1209 / IS 73.

Modified Bitumen Testing

PMB and CRMB flash/fire point testing for modified bitumen grades.

Test in Action

Flash & Fire Point Test of Bitumen — Site Images

Flash Point Apparatus

Test Flame Applied at Specified Intervals

Flash Point Temperature Recorded

Test Procedure

How the Flash & Fire Point Test of Bitumen is Conducted

1

Sample Preparation

Bitumen sample heated to approximately 75°C above expected flash point. Poured into Cleveland cup or Pensky-Martens cup to specified level.
2

Heating Rate Setup

Sample heated at 14–17°C/min (Cleveland) or 5–6°C/min (Pensky-Martens) per IS 1209.
3

Test Flame Application

Small test flame applied every 2°C rise in temperature. Temperature recorded at first flash (flash point).
4

Fire Point Determination

Heating continued. Temperature recorded when sustained burning for ≥5 seconds (fire point).
5

IS 73 Compliance Report

Flash and fire point vs IS 73 minimum of 220°C. NABL report within 3 days.

Standards & Specifications

Applicable Test Standards

Standard	Title	Scope	Type
IS 1209	Methods for Testing Tar and Bituminous Materials — Determination of Flash Point and Fire Point	Flash & Fire Point	Indian Standard
IS 73	Paving Bitumen — Specification	Bitumen Grades	Indian Standard
ASTM D92	Standard Test Method for Flash and Fire Points by Cleveland Open Cup Tester	Cleveland Cup	ASTM
ASTM D93	Standard Test Methods for Flash Point by Pensky-Martens Closed Cup Tester	Pensky-Martens	ASTM

Applications

Where is the CAPO Test Used?

Safety verification of paving bitumen before hot mix plant use

PMB and CRMB modified bitumen flash point safety testing

Bitumen boiler and distributor safe operating temperature verification

Acceptance testing of bitumen from new suppliers or unknown sources

Forensic investigation of bitumen-related fire incidents at hot mix plants

Research on flash point of crumb rubber and polymer modified bitumens

Why Choose Global Lab

Our Advantages

NABL Accredited ReportsLegally valid IS 73 safety certificates for project and insurance compliance.

Both Cup MethodsPensky-Martens (closed) and Cleveland (open) cup both available.

Safety Critical ExpertiseExperienced in flash point testing for site safety and legal compliance.

Fast 3-Day TurnaroundResults within 3 working days.

Complete Bitumen PackageFlash point + Penetration + Softening Point + Ductility offered together.

Pan-India CoverageBitumen safety testing at all 7 lab locations.

Flash & Fire Point Test of Bitumen(Pensky-Martens Closed Cup)