... MATERIALS II.1 MELTING (or SOFTENING) TEMPERATURE, Tm All data are for melting points at atmospheric pressure. For polymers (and glasses) the data indicate the glass transition (softening) temperature, ... for minimum weight, stiffness-limited design. z Materials Data Book 17 III.2 STRENGTH – DENSITY ... 21III.6 MATERIAL PRICE (PER KG) Figure 3.6: Material price (per kg), mC (2003 data) . mC represents raw material price/kg, and does not include manufacturing or end-of-life...