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为获得合格的实型铸造用泡沫聚苯乙稀模样，探讨了ＥＰＳ珠粒的粒度，预发泡倍率与预发泡珠粒的容积密度和模样密度的关系；发泡成型脱模后，模样重量与尺寸随时间的变化。为制定实型铸造用泡沫聚苯乙烯模样的制作工作提供依据。例如壁厚６ｍｍ～７ｍｍ的铸件可选用粒径０３ｍｍ～０４ｍｍ的ＥＰＳ的珠粒制造模样。对模样的密度要求是，黑色金属００１５～０２０ｇ／ｃｍ３，非铁合金为００２０～００２４ｇ／ｃｍ３。为保证模样表面光洁，预发泡珠粒必须经过１６～２４小时停放（熟化）。为稳定模样尺寸和重量，发泡成型脱模后的模样，最少应放置１０天才能使用。
In order to obtain a suitable solid cast polystyrene foam sample, the relationship between the particle size, the pre-expansion ratio and the bulk density and pattern density of pre-expanded beads was discussed. Weight and size changes over time. In order to develop a real casting foam polystyrene to provide the basis for the production of work. For example, the wall thickness of 6mm ~ 7mm castings can choose particle size 0 3mm ~ 0 4mm EPS beads make appearance. The densities of the samples are as follows: ferrous metal 0015 ~ 020g / cm3, non-ferrous alloy 0020 ~ 0024g / cm3. To ensure a clean appearance, pre-expanded beads must be parked for 16 to 24 hours (aging). In order to stabilize the size and weight of the sample, the appearance of the molded foam should be kept for at least 10 days before use.