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Steam Biological indicator is specially designed for monitoring steam sterilization processes. If the sterilization process is unsuccessful, after incubation at 60±2°C, the color of the medium will change from purple to yellow or its shades, indicating the presence of still viable Geobacillus stearothermophilus (ATCC 7953) spores. If successful, there will be no color change.
| Product Name | Self-contained Biological Indicator for Moist Heat Sterilization |
| Type | BF-BI4 |
| Units per Pack | 25 pcs/box |
| Indicator Bacteria | G. stearothermophilus, ATCC7953 |
| Spore Population | ≥1.0×10⁵ cfu |
| D-Value | ≥1.5min (at saturated steam 121ºC) |
| Incubation Time | 48h |
| Result Interpretation | Color Change: Positive; No Color Change: Negative |
| Certificates | ISO13485 |
The Biological indicator consists of a medium in a glass ampoule, a disc inoculated with spores, a chemical indicator strip, a plastic tube, a plastic cap, and a filter paper inside the cap.










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