We often forget that ‘ambient’ storage will mean temperatures of between 17 and 20°Celsius here in the UK.
Many bulk storage facilities and bonded stores however are not heated.
What does this mean to rubber components being inspected?
Bring on the Heat!
Today in the UK, much of our rubber sheeting product is being produced in the Far East – where daytime average temperatures are often much higher than here in the UK.
Therefore – when testing is carried out locally at manufacture, materials can show dramatically different results than when they arrive here in the UK – especially in the depth of Winter!
For instance – we see thick rubber mats, 2mts x 1mt x 25mm – measuring 2000mm x 1000mm on production, but measuring 1976mmx 980mm in a UK warehouse at 4-5°C. Thinner materials can vary even more!
So – this is a basic law of physics – temperature based contraction and expansion. Materials below ambient temperature will also display other incorrect information when testing – such as hardness, elasticity and compression set.
To heat a pallet of sheeting that measures 2mt x 1mt x 1mt (say 20 x 50mm thick sheets – 2840kgs) – takes a long time after its core temperature has gone down to 0°C in a bonded store, or in a container travelling from Malaysia.
We have found the only sure-fast way of inspecting materials stored at low temperatures is to split them up and then bring them up to temperature over a period of time before making physical measurements.
So – something else to take into consideration !
Give us a call, or email us with your particular enquiries – we can help with design and advice on a wide range of parts and materials.