Tag Archives: temperature

Website updates and new site for the USA on its way

The last few weeks have been pretty busy here at Temperature Indicators. We’ve been busy upgrading our UK based website so that the software behind the scenes is completely up to date. This enables us to provide a good service selling a comprehensive range of temperature indicator thermometer labels, medical sterilisation and contamination indicators and food processing indicators. Whilst that has been going on we’ve also decided to invest in a website solely focused on the USA market, that will provide thermometer labels to industry. We’re busy building that and hope to launch it this summer.

We also have been supplying the SteriTec Retort Check and Air Check food canning batch processing indicator tags to our US customers for many years now. These are indicators made of strong, moisture resistant card that are used in a variety of canned food processes where a static retort is used. The ink used on the Retort Check tags will only change colour if the correct combination of time, temperature and steam (of a sufficient quality) is present in the retort. The Air Check tags are used when the process demands the use of small quantities of air to pressurise the retort vessel, usually a Lagarde system.

Over the last 2-3 years we’ve seen a big increase in business in the USA and we realised last year that the time was right to set up a new company to focus on providing the best possible service to our US customers. Our intention is to provide an online presence that will allow customers in the food processing sectors in the USA, Central America and South America to order online, check pricing and quantity discounts and to benefit from special offers, such as promotions and free delivery offers on our unique range of food processing indicators. We’re busy building that website and we hope that you’ll check it out. The software we’re using is right up to date and should enable us to list products through amazon, eBay and others whilst still providing a very high quality service to our long standing account customers who buy in volume.

All shipments will be from our new warehouse facility in California and we’re shipping orders with FedEx to ensure a prompt and reliable delivery to our customers.

As you can imagine, we want to get things right from the outset, so building the site will take a little time, but we’ll post an update when we’re at the testing stage.

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Aston Martin to sell 37.5% to Italian company – learn how their upholstery is made

We learned today that Aston Martin, one of our favourite car manufacturers, has sold a chunk of the company to an Italian company, Investindustrial.

A while ago we were contacted by the aforementioned luxury car maker to help them find a way to ensure the upholstery met their very high standards. The leather used on car seats is bonded to a thin layer of foam before being fitted to the seat. The foam and leather are bonded together and pass over heated rollers to ensure a strong bond. The rollers are heated, each to a different temperature. What AM wanted to do was to verify the temperature of each roll once each had reached the appropriate operating temperature.

We suggested they used some of these: temperature sensitive labels. This enabled them to independently demonstrate the maximum temperature of each roller and ensure that the leather upholstery was properly constructed.

So if you’re ever fortunate enough to find yourself sat in an Aston Martin, remember the lengths they go to in order to make sure that seat meets their very high standards.

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Buying steam autoclave tape? We’ll beat the price of your current supplier!

Lead & Latex Free Autoclave Tape

Price-beating promise on all autoclave tape


Temperature Indicators can now supply very high quality Class 1 autoclave tape for steam sterilisation autoclaves.

This process indicator tape is lead & latex free and available ex-stock in two sizes, 18mm and 24mm, both 50m length. This tape, unlike many on the market, is not made in China but in North America and performs to the highest standards. It conforms to ISO 11140-1:2009 (Class 1) specification and the ink changes from beige/light green to black when exposed to a suitable process.

Based in Tunbridge Wells, Kent in the UK, Temperature Indicators only supplies visual indicators that are used to give users the clearest and most reliable indication of temperature change or exposure to sterilant media. A full range of instrument washer validation indicators are also available: the Wash Check range manufactured by SteriTec in the USA, and a full range of SteriTec time and temperature integrators to conform to other ISO standards, including steam, dry heat, pre-vacuum, Formaldehyde and EtO sterilisation processes. With 25 years experience and stock available to ship next day, customers can rely on prompt deliveries of high quality products that are 100% accurate. We offer the best available products at highly competitive prices and ship worldwide.

Many people will already be buying this kind of tape, so Temperature Indicators offer to beat the current price of all existing IDSc members’ existing suppliers – and have done so already for several UK hospitals. You can also request a free sample of this autoclave tape by emailing sales@temperature-indicators.co.uk

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How It Works: the Tempsafe 70 surface temperature warning label

In keeping with our idea to explain the functionality of our products, we thought we’d cover the Tempsafe 70, a neat product that can be used to show when the temperature of a surface has reached potentially dangerous levels.

This label is really clever. First we start with a regular label with a printed image, in this case one that shows a warning triangle, a temperature figure and a graphic depicting a thermometer. Put all that on a yellow background and you have a warning label that really stands out. The label is then coated with a material that is black at temperatures below 60C, thereby obscuring the yellow background and the printed graphics.

The label is adhesive backed and can be placed on most clean, dry, smooth surfaces (note that it’s important that the label is in contact with the surface, they react from the back forward; the adhesive side need to warm up to create the reaction).  Once in position, the temperature warning label will react to rising temperatures. Up to 60C there is no change and the label remains black. As 60C is reached and exceeded, the label will start to change colour. The black layer starts to turn clear, and the printed message below starts to be revealed.  At 70C the black layer is completely clear and the message is visible in its entirety.  The graphic on our website shows this change

The Tempsafe 70 indicator for hot surfaces

A safety label for compliance with EU Machinery Directive 2006/42/EC

It gives a strong indication of temperature increase, is very obvious and visible, and the graphics allow for its use in all locations and facilities.

The neat thing about this label is that we can tailor make the backround to a customer’s requirement, so if you want a corporate logo, branding or even a special message in an alternative language, these can all be accomnodated, subject to some minimum quantity restrictions.  We trialled the label in a closed car interior recently on a warm sunny day, and we were surprised to see it change colour.

The label is available here and can be bought as a single label or in a value pack of 10 labels. It can be a big help in ensuring complaince with teh EU Machinery Directive. If you need more information, check out the product page on our website or get in touch.

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Lower Shipping Costs For Europe

We’re continuing to roll out lower shipping costs across the site, after the success of our reduced shipping costs for US customers. This week we’re rolling out cheaper shipping costs for all our customers in the European Union, using FedEx. That means that you can now order temperature indicator labels or medical sterilisation indicators and benefit from a reduced overall cost. It also allows for online tracking.

We’re committed to keeping our prices competitive and are proud to say we offer much better prices across our range than our competition.

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How It Works: Irreversible Temperature Indicator Labels

Image of 8 level irreversible temperature indicator strips

8 Level Indicators

Each temperature indicator label contains many component parts, all working together to give an accurate colour change when a temperature is reached.

The key component at the core of the label is a number of active layers – and remember we’re talking very, very thin layers. One of these layers is a carefully formulated white wax which is located over a layer of black paper. When heat is absorbed by the paper it expands – like a sponge – whilst melting the wax. The wax seeps through the black paper, giving the visual colour change from white to black. A red paper can be used to give a white to red colour change. This whole process takes a maximum of about 4 seconds, with that time decreasing if a indicator temperature is exceeded very quickly. All the labels are backed with adhesive and a good seal to the surface is part of ensuring the indicator works well.

The colour change is irreversible; once the change happens, it is permanent. We recommend users to position the indicator label in situ, observe, note the reaction and remove the label when the observation is complete. For some users, that can be a matter of minutes or even seconds, for others it can be months. Removal tends to separate some of the layers, affecting the colour change, and as a result the labels tend not to hold up too well to being removed and stored as permanent records. Customers that need a permanent record should contact us to discuss the options, such as cost-effective printing solutions where we print a card onto which the indicator is placed, allowing data to be recorded alongside the temperature indicator label.

One example of is was a foil backed card that we printed on the paper side with various boxes and data to allow information to be recorded. The temperature sensitive label was then positioned in a prominent location to allow food plant operatives to easily check if the required temperatures had been achieved. The indicator and card combinaton was for use in a food processing plant and was to accompany a cooked meat product on a production line. The manufacturer didn’t like the idea of the card potentially being damaged and consequently retained in the product as a contaminant, so we decided that a foil card would be a good way to rapidly determine any problems. All the cooked meat went through a metal detector at the end of the process and any fragments of card that had come away in the process would be detected and could be removed.  The cards work very well and are retained and stored for validation of quality assurance / control procedures.

The temperature indicating labels react according to the temperature of the surface to which they are applied – that is they react to what they are stuck to, rather than atmospheric / external conditions. It is important to ensure they are placed on a clean, dry surface and we often recommend users to paint a layer of clear epoxy over a label if it is going to be exposed to aggressive conditions.

Storing the indicators in a refrigerator before use ensures a good shelf life and maintains accuracy – it keeps the wax from drying out, which inevitably happens over time. The indicators have a one year shelf life.

Each reaction temperature needs a different wax, and these have been tried and tested over many years to ensure reliability and consistency. One advantage of this is that we have a wide range of temperatures available across a wide range of different labels, though different temperatures can’t be manufactured due to the unique wax formulations required.

One thing we’ve learnt over time is that every application for temperature labels is unique. We pride ourselves on our ability to advise our customers on the best way to use our label products but also on their limitations. We keep our prices very competitive, our minimum order quantities are very small and we offer bulk discounts for large volume orders. 99% of our items are in stock and can ship within 24 hours. Email us with any questions – we’re here to help.

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Cold Weather, Freight and Freezing Indicators

freeze indicator label

Freeze Watch

We’ve just heard back from our freight forwarder that shipments are starting to move again, albeit slowly. As a precaution we’re taking bookings for cargo 5 or 6 days forward just to make sure we get the space. We have a couple of our customers who are canners overseas who need retort process indicators urgently and are held up because of the snow and unusually cold weather in and around London (a temperature of -10C is very rare here but has been almost continually for 2 weeks now). Rest assured we’re doing our best. UK deliveries for canning indicators and temperature labels are doing better, with minor delays of approximately 2 days at the moment.

We won’t be closing for the Christmas and New Year interim period but we do expect courier companies to be operating with reduced staff. If you need stock urgently then let us know, and remember that our online ordering system is available 24hrs a day. It’s the fastest way to get a delivery.

At this time of year we always see an increase in popularity of the Freeze Watch indicator that provides evidence of exposure to freezing conditions. Check it out in the Refrigeration section of the website – we’ve made sure we have good stocks available for immediate shipment. It’s a great product: accurate, easy to use and has a strong visual impact. Just peel off the backing paper and stick it to our chosen item or surface. If temperatures drop below 0C / 32F then the indicator activates and you see the colour change seen in the photo above. Need to measure refrigerated products to check for increasing temperatures? Why not have a look at the Chillchecker?

Best wishes for the holidays and wrap up warm!

All at TI

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A photo of a shocking car interior temperature

Worrying isn’t it? This photo was taken through a windscreen, to show one of our Tempsafe indicators reacting to the interior temperature  of a vehicle in summer sunlight. We’re often asked if we can provide indicators for this application – often the results are very shocking. This could kill a pet in a matter of minutes.

Indicator shown reacting in a car interior, temperatures reached 85ºC!

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USB Data Logging Thermometer

Image of USB Data Logging Thermometer

USB Data Logging Thermometer

We’re going to carry one of these USB Data Logging Thermometers around for a few days.

What do you think are the highest and lowest temperatures it will record?

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Vehicle interior temperatures in warm weather

Tempsafe Safety Label

Tempsafe Indicator reacts to high temperatures

About this time last year we conducted a very basic set of tests to find out how hot a car interior can get when in direct sunlight, with outdoor temperatures reaching 25 to 30C.

We parked a car with a black interior outside our office and lined up our liquid crystal and Tempsafe indicators on the dashboard.

The liquid crystal labels start to react at low temperatures, and we weren’t surprised when the colour change went to 55C. What was very worrying was that the Tempsafe very rapidly changed colour at about 70C. The other indicators then continued to react until an astonishing maximum temperature of 85C was recorded in the car.Liquid Crystal Thermometer

The car windows and doors were all closed, the car had been in direct sunshine for 2 hours before the tests commenced and we then observed the colour changes through the windscreen.

A roast chicken is said to be cooked when the centre reaches 80C. A pet left in the car would survive only minutes.

The BBC got in contact about the tests – they had recently reported a story about two dogs dying in a hot car – and we went on Radio 2 to help warn people about the dangers of leaving pets in vehicles. Even if the windows had been left open to allow air to circulate, the car interior would still have reached dangerous temperatures very quickly.

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