The service temperature is the temperature when the material starts to degrade.The effective service temperature of a plastic can vary significantly with the rate of loading.Apparently, small load application rates at high temperatures can have the same effect as large load application rates at lower temperatures.
The Ashby chart (University of Cambridge, U.K.) shows that for PVC the maximum service temperature is about 65°C. Rigid PVC offers heat deflection temperature, where softening starts to occur, at 70°C temperature or vicat softening temperature at 75°C.
Dincel-polymer which is a significantly modified version of common rigid PVC shows, under fire tests by CSIRO Australia, displays excellent heat release properties which are better than common rigid PVC and even plasterboard.This clearly indicates that the Dincel-polymer service temperature will exhibit a better service temperature than 65°C at the same strength level.However, irrespective of this fact the reader must remember that Dincel-Wall consists of concrete infill.The strength of Dincel-form is only required at the time of concrete pouring to hold the wet concrete pressure.Dincel-Wall, being a formwork, only requires serviceability performance at the time of concrete pouring.It is not an allowed practice of the construction industry to pour concrete at an ambient temperature of 65°C in the first place.It is therefore not a concern for Dincel-Wall if the ambient temperature reaches 70°C after concrete infilling.
The concrete industry/engineers need to be aware that the concrete’s hydration temperature needs to be considered when using high strength concrete in excess of 65 Mpa (28 days) concrete.The concrete’s hydration temperature is based on many factors including ambient temperature at the time of concrete pouring, plastic concrete’s temperature, water/cement ratio, cement/aggregates size and type and many other factors. Dincel Walls have already been used successfully incorporating 80 Mpa concrete at 28 days strength. Contact your concrete supplier to confirm appropriate mix design for strength exceeding 28 days concrete compressive strength of 65 Mpa.
As a common practice the concrete mix design shall be organised in a way that the hydration temperature never exceeds 65°C. Otherwise concrete above 65°C displays deleterious effects.
When 65 Mpa concrete is prepared and poured under Australian Standards, it is a rare possibility for the concrete's hydration temperature to exceed 40°C or even 50°C if the thickness of the wall is limited to 200mm as in the case of Dincel-Wall.
DCS has already used 80 Mpa concrete strength in year 2011 for a 27 storey building in Melbourne, Australia. Download - Hickory Testimonial
If the question is, can Dincel-Wall be used for daily ambient temperatures reaching up to 70°C, then the answer in the case of Dincel-Wall would be a definite yes as the concrete infill has already set and hardened.
However, if the question is that if dark finishing colours subject to sunlight can be used refer to the following Q11 and Q12.