Standard Time-Kill test (ASTM E2315)
A Standard Time-Kill (STK) is a laboratory test which measures the antimicrobial performance of a liquid sample over a short period of time. The kill test quantifies the reduction in numbers of a known inoculum of microorganisms over specified contact times. This method determines the effective kill rate of a finished product, usually expressed as a % (for example, “kills 99.9% of bacteria in 30 seconds”).
Suitability of test
|Exposure times||30s, 1m, 2m, 3m, 5m|
|Sample required (g)||250|
As standard, the STK is performed with a mixture of 4 test species of microorganism.
For specific end products, we can also test against appropriate organisms, for example, feminine wash products may be tested against Candida albicans.
If you require a specific test culture or contact time that is not listed, then please contact us to arrange a customised method.