Is the liquid safe?

Yes. Please contact us for the MSDS for further information. We only use food-grade oils and non-toxic colourants in our formulation.

In the unlikely event that the liquid leaks from the indicator and comes into contact with skin, simply wash with soap and water. If the liquid comes into contact with eyes, rinse immediately with plenty of water and seek medical advice.

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Do I need to pre-condition indicators prior to activation?

No. Unlike some other threshold temperature products, Timestrip® PLUS does not require pre-conditioning.

You need to activate above the product’s threshold temperature, as you cannot squeeze the dye out of the blister if it is in solid form. Immediately after activation, stop the progress of the dye by placing the indicator below its STOP temperature. You can adhere the Timestrip immediately to a product or carrying card which is below the STOP temperature.

Alternatively place the activated indicator in an environment much colder than the STOP temperature for a short period of time.

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What are your Acceptable Quality Limits (AQL’s)?

The Accepted Failure Rate is based on ANSI/ASQC Z1.4 (formally MIL-STD-105E) Level II Normal Inspection. Packs are over shipped by 2-3 units per 100 to cover this AQL.

Central to this process are tests against defined specifications for; how quickly the dye progresses through the membrane, environment sensitivity (high heat and vacuum tests to check resilience to harsh conditions during shipping) and also the accuracy of the threshold melting point. A full pack of release reports is provided with each shipment. Further details are available on request.

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Why do Timestrip® PLUS have a ‘START’ and a ‘STOP’ threshold temperature ?

The melting point of a solid is the temperature at which it changes state from solid to liquid.

The freezing point (or crystallization point) is the temperature at which a liquid changes to a solid. For certain substances the melting and freezing point are not the same and the freezing point is lower than the melt point. This behaviour is called hysteresis. At the STOP point (freezing point) the dye can’t move. At the melt point the dye moves and indicates a threshold breach.

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How are Timestrip® PLUS products evaluated for their time accuracy?

Timestrip® PLUS are polymeric multi-layer indicators. They are based on spontaneous lateral wetting by a blue liquid inside a porous substrate and not a chemical reaction. Each production batch (7000 – 8000 products) undergoes strict quality control tests to validate its time accuracy.

This is conducted via a computer vision software (TSCV) which analyses scanned photos of seven randomly-selected products from each batch (roughly 0.1% of the population). The photos are taken at different elapsed times and the tested products are placed at their designated temperature through the entire test period. The software automatically analyses the lateral progress and the elapsed time of each product tested and the data is presented numerically and graphically in a specific file which is labelled by batch. This data is translated into a final release report which is attached to the outgoing product batches.

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