1. How is EPS manufactured?
When raw EPS particles containing a blowing or expanding agent are softened by heating with steam, the hollowed closed cells are formed within the particles, which expand up to 50 times their original volume.
2. How are EPS blocks manufactured?
Blocks of EPS are mde by resoftening the expanded particles in a block mould with steam until they fuse together. The block is then cut into sheets or boards.
3. How is shaped EPS manufactured?
Shaped EPS products are produced either by cutting blocks with a hot wire or by direct moulding of the expanded particles in specially shaped moulds.
4. How effective is EPS as a thermal insulation material?
Extremely effective, essentially becuase stabilised air is such a good insulator. The thermal performance of a material is measured in terms of its resistance to the flow of heat. This thermal resistance is expressed in R-values. The higher the number, the better the insulation. The R-value of the most commonly used class (Class SL) is 1.13 for every 50mm thickness. Tus, 44mm of this class of EPS delivers an R-value of +1.0.
5. Does EPS absorb water?
EPS is a closed cell and cannot absorb water. During thr process of moulding a block, tiny channels are formed between the EPS particles. If the material is immersed in water, these tiny channels can be filled with water. After immersion for more than 360 days, there may be up to 6% water content by volume which has entered the channels. Even under such an adverse and rare condition of prolonged saturation, EPS suffers little adverse effect. It maintains its shape, size, structure, cohesio and physical appearance. The ability of EPS to resist the adverse effects of moisture is exemplified by its widespread use in floats, marinas and other applications, which involve full or partial submergence in water for prolonged periods of time.
6. Does EPS have capillary action?
No, EPS does not have capillary action.