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(PDF Version - 122 K) Dangerously Reactive Materials are unstable or highly reactive materials that can undergo extremely hazardous uncontrolled reactions.They can cause explosions, fires or extreme heating, with potential for significant personal injury and property damage.
1 A stiff material has a high Young's modulus and changes its shape only slightly under elastic loads (e.g. diamond). 2  A flexible material has a low Young's modulus and changes its shape considerably (e.g. rubbers). A flexible material has a low Young's modulus and changes its shape considerably (e.g. rubbers). 2  A stiff material requires high loads to elastically deform it-not to be confused with a strong material, which requires high loads to permanently deform (or break) it.