Flash point measured using the closed cup method is a precise and safety-critical analysis that shows the lowest temperature at which oil vapors can ignite in a closed system. This provides a realistic assessment of ignition risk under actual operating conditions, where vapors are contained and concentrated.
The sample is heated in a closed container under controlled conditions, and at specific temperature intervals a small flame is applied. The temperature at which visible ignition occurs is recorded as the flash point.
The result provides the customer with important insight into the flammability of the oil or liquid being analyzed. A low flash point can indicate fuel contamination or oil degradation, and is a clear warning of increased risk during storage, transportation or use. The analysis is used both as a safety check and as part of the quality assessment of oil and fuel products.