here's an article on HT diecast picked up from on.cc (not using google translate this time
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According to HT: Collectors have always been complaining that Iron Man figures from HT aren’t solid or heavy enough; so when HT received the green light to manufacture Iron Man 3 figures, we wanted to implement new design. After many research and development, we came out with this new series MMS Diecast Series, by using diecast material yet not compromising its pose ability.
Say good bye to ‘pink panties’
In order to make it [Iron], part of the components need to be compromised;
there can’t be too many details when using die cast, for example helmet will be made of plastics. Die cast part will be used on arms and legs. The figure will be consist of 40% die cast hence it will weight around 1.5 kg; it will be one of the heavy weight figure. On the other hand, the usual ‘panty’ PVC part will be replaced by ABS, the ‘pink panties’ issue will be resolved.
The joint part will be even more realistic.
Would there be a problem since it is much heavier now? HT has modified part of the joints with ratchet mechanism, hence improvising the pose ability on diecast material. There more development on other parts: the chest and abdominal are comprised of 3 parts, allowing more movement; elbow consists of 3 joints, hence it could bend more than 90 degrees, all these development are to achieve more human realism. Whilst on head sculpt, despite Don Cheadle has approved it, JC. Hong is yet to be satisfied hence it is still under some modifications. Iron Man fans have to be more patient before the final head sculpt is being released.