Short answer
A-0, A-30 and A-60 state the insulation time of the "A" class fire divisions defined in SOLAS Chapter II-2. Windows and side scuttles fitted in these divisions must keep the division's class.
What is an A-class division?
A-class divisions are made of steel or equivalent material, suitably stiffened, and stop the passage of smoke and flame to the end of the one-hour standard fire test. The insulation criterion: the average temperature rise on the unexposed side may not exceed 140 °C, nor 180 °C at any one point.
Classes
- A-60: the criterion is met for 60 minutes.
- A-30: 30 minutes.
- A-15: 15 minutes.
- A-0: integrity only, no insulation time.
The class required depends on where the division is and on the spaces on either side, per the SOLAS tables.
How are windows tested?
Windows and side scuttles are tested to the IMO Fire Test Procedures Code (FTP Code), Annex 1, Part 3, with the real installation detail. The tested size and configuration define the scope of approval; other sizes or glass build-ups are assessed separately.
Documents
- Test report: from a recognised laboratory, to the FTP Code.
- Type approval: from a body authorised by the flag state or a classification society.
- MED / wheel mark: for EU-flagged ships, where the product is in scope.
A product's fire class should not be accepted without checking these documents and their validity.