24 janvier 2016 ~ 0 Commentaire

Extruded vs Expanded foam What’s the difference

There are various iterations of foam: rigid, plain styrofoam sheets, extruded, and expanded. The after two, expanded and extruded, are probably the most used in terms of home building projects, but what’s the difference?

mixer extruder

Expanded called Beadboard Often, sheets are produced from solid beads of polystyrene. These beads happen to be expanded by injecting and dissolving handful of pentane gas into the base materials during production. Under high temperature, the gas expands the beads to form closed cells. These cells are approx. 4o times the quantity of the initial bead, and can end up being molded to form insulation boards, blocks, or shapes. While a shut cell structure and resistant to water nonetheless, it isn’t as resistant to wetness as XPS is without question, but that may be splitting hairs. It is generally cheaper than it ‘extruded’ cousin and scientific tests show EPS to get a lower impression on the environment and can be recycled a lot easier than XPS.

Extruded, this foam begins with solid polystyrene crystals. The crystals, and also other additives will be fed into an extruder. Within the extruder itself, ruthless and heat form the mixture right into a plastic fluid. This thick liquid plastic is then forced right into a die where it emerges and expands to a foam. This foam is shaped, cooled, and cut. Due to extrusion process, XPS has the capacity to maintain steadily its thermal and/or physical properties even more uniformly than EPS and makes a great replacement for corrugated cardboard, thus it gained in attractiveness amongst architectural modelers. Another advantage of XPS is going to be it’s strength: because it subjected to higher compression during the manufacturing process, it really is slightly more rigid than EPS. Also, because the closed cell structure is undoubtedly finer than that of EPS indeed, XPS resists wetness better. I assume once this started to be the defacto amongst these modelers, it migrated over to railway modelers. Manufacturers often add dye, which has no effect on the XPS other than identification of the manufacturer.

So which is better? Well, after reading numerous articles it does certainly seem that Extruded foam includes a few slight positive aspects after all. But let me note the emphasis on slight. For some railway modelers with straight forward layouts, there probably is not any difference because the foam shall be covered anyway by other materials such as for example plaster. In the end, it appears the three main differences are: Price, where EPS gets the advantage; Durability, where XPS stacks up a little better and retains its rigidity, and finally, Moisture resistance, where once more, XPS has a minor advantage.

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