Check a bitumen COA against your specification: match test methods, compare limits, understand aging tests and decide before you accept a cargo.
Bitumen COA vs Specification: How to Check a Cargo Meets Your Grade
A Certificate of Analysis (COA) reports what a batch measured; a specification states what you require. Accepting a cargo means comparing the two line by line, using the same test methods. This guide explains what each COA test tells you, why limits for the same grade differ between specifications, how to read a worked example, and what to do when a result falls outside the limit.
Last reviewed: 2026-10-24. Publisher: PetroBind Global.
What is the difference between a COA and a specification?
A specification is the requirement: the limits your tender, contract or national standard sets for the grade. A COA is the evidence: the measured results for one batch. Neither is useful alone. For Malaysian road work the specification is typically based on MS 124 (the Malaysian standard for penetration-grade bitumen) or the JKR road works specification, so compare the COA against whichever standard your contract names, using its current text.
What does each test on a COA tell you?
Each line answers a different buyer question. Know what you are checking before you compare numbers.
- Penetration at 25°C (ASTM D5): confirms the grade. A 60/70 result must fall between 60 and 70.
- Softening point (ASTM D36): shows how much heat the binder takes to soften, a guide to behaviour in hot pavements.
- Ductility at 25°C (ASTM D113): how far the binder stretches before it breaks, a guide to cohesion and flexibility.
- Flash point (ASTM D92): the temperature at which vapour can ignite. It is a safety limit for heating and handling.
- Solubility (for example ASTM D2042): the share of the binder that dissolves in solvent, an indicator of purity.
- Aging or loss on heating: tests that simulate the hardening bitumen undergoes during mixing. European specifications use the RTFOT (EN 12607-1) and set limits on mass change and retained penetration.
Why do limits for the same grade differ between specifications?
Because each standard sets its own limits. PetroBind lists a typical 60/70 softening point of 49-56°C. One supplier data sheet for 60/70 gives 48-56°C, and a 2008 Egyptian code lists 45-55°C. All describe the same grade name, but they are different documents with different limits. That is why you should never test a cargo against a generic table or another buyer's numbers. Use the limits in your own contract, and ask the supplier to report against that standard.
| Property | Typical value | Test method |
|---|
| Penetration at 25°C | 60-70 dmm | ASTM D5 |
| Softening point | 49-56°C | ASTM D36 |
| Ductility at 25°C | 100 cm min | ASTM D113 |
| Flash point | 250°C min | ASTM D92 |
These are typical values listed by PetroBind Global. Your specification governs acceptance.
What does a worked comparison look like?
The numbers below are illustrative only and are not from a real batch. Suppose a project specification requires penetration of 60 to 70 dmm, a softening point of at least 49°C and a flash point of at least 250°C. A COA reporting penetration 64, softening point 51°C and flash point 262°C passes all three, because each result sits inside its limit and each names its test method. A COA reporting penetration 72 fails on grade even if the other results pass. A COA that leaves out ductility when your specification requires it is incomplete: ask for the missing result before acceptance.
Which specification systems should overseas buyers recognise?
Paving bitumen is named differently across markets. ASTM D946 covers penetration grades (40-50, 60-70, 85-100, 120-150, 200-300), ASTM D3381 grades by viscosity, and ASTM D6373 covers performance grades. European projects use EN 12591, with grades such as 50/70 and 70/100. India grades paving bitumen by viscosity under IS 73. The same product can therefore be described in several ways. Confirm which system your contract uses and which test methods it names, then ask for results reported against those.
What if the COA looks right but something is off?
Check three things the numbers cannot show. First, the batch identifier on the COA should match the cargo documents. Second, the test methods should be the ones your contract names. Third, results from two laboratories will differ slightly because every test method has a stated repeatability, so a small gap is normal, while a large one deserves an explanation. If a result is outside the limit, raise it in writing, ask for a retest or the inspection report, and rely on the failure terms you agreed before shipment.
Where does independent inspection fit?
A supplier's COA is the supplier's own evidence. Independent inspection (for example SGS) adds a neutral check at loading. PetroBind Global arranges independent inspection before shipment on confirmed orders and provides COA and PDS documentation checked against ASTM, ISO and EN test methods. Agree in the contract who arranges and pays for inspection, and what happens if the batch fails. See the guide on reading a COA for a property-by-property walkthrough.
Sources and further reading
Test-method references come from ASTM D5, D36, D92, D113 and D2042. Grade lists come from ASTM D946, D3381 and D6373, EN 12591 and India's IS 73. The European aging limits come from supplier data sheets by ORLEN, LOTOS and ExxonMobil, and the alternative 60/70 limits from a supplier sheet and the 2008 Egyptian code. Always read the current text of the standard your contract names.
Frequently Asked Questions
- Q: What is a bitumen COA?
- A: A Certificate of Analysis: a document reporting measured test results for a specific batch, such as penetration, softening point, ductility and flash point.
- Q: Is a COA the same as a specification?
- A: No. The specification is what you require; the COA is what the batch measured. Compare the two to decide acceptance.
- Q: What if the COA test method differs from my specification?
- A: Ask the supplier to confirm or provide results by the method your specification names before accepting the cargo.
- Q: Why are 60/70 limits different in different documents?
- A: Each standard or supplier sheet sets its own limits for the same grade name. Always use the limits in your own contract.
- Q: Can a COA pass and the cargo still be wrong?
- A: Yes, if the COA belongs to a different batch or uses a different test method. Check the batch identifier and the methods, and use independent inspection as a second check.
- Q: Do I still need inspection if I have a COA?
- A: Independent inspection gives a neutral check beyond the supplier's own COA. PetroBind arranges it before shipment on confirmed orders.