Class 4 TST Testing Strips

Class 4 TST Testing Strips

These Class 4 TST (Time, Steam, Temperature) indicator strips are designed for use in non-vacuum steam autoclaves, providing reliable multi-parameter monitoring of sterilisation cycles. Supplied in a pack of 200, they offer a cost-effective solution for daily verification of autoclave performance in veterinary practices, laboratories, and healthcare settings.

Class 4 indicators are defined as multi-parameter chemical indicators that respond to two or more critical sterilisation variables, such as temperature and exposure time. These particular strips are calibrated for:

• 134 °C for 3.5 minutes

• 121 °C for 15 minutes

These settings reflect common gravity (non-vacuum) steam sterilisation cycles and allow you to verify that your process has achieved the required conditions.

Once processed, each strip produces a clear, irreversible colour change, providing immediate visual confirmation that the correct sterilisation parameters have been met. This visual feedback supports your infection control procedures, ensures compliance, and offers confidence that instruments have been properly processed before use.

Key Features & Benefits

• Multi-parameter Class 4 chemical indicators – monitor both time and temperature.
• Calibrated for 134 °C at 3.5 minutes and 121 °C at 15 minutes.
• Supplied in a pack of 200 strips – ideal for routine daily use.
• Clear, irreversible colour change for easy interpretation.
• Suitable for non-vacuum steam autoclaves.
• Helps support sterilisation assurance and quality control programmes.

Usage & Application
Place one indicator strip inside each pouch, tray, or pack being sterilised – ideally in a location that is hardest for steam to reach. Run the sterilisation cycle, then inspect the strip once complete. If the colour change shows the required parameters have been met, the load can be considered properly processed.

Important Note
Class 4 indicators provide valuable monitoring of key sterilisation parameters but do not replace biological indicators or full process validation for critical or implantable instruments.

Perfect For
Veterinary surgeries, dental clinics, laboratories, and healthcare environments using non-vacuum autoclaves that require simple, effective, and affordable sterilisation monitoring.

Please see the full Sterilisation range for more great products.