The Materials Guide allows to find material science databases and to filter them by material class and ways of accessing them.

SpringerMaterials

Is Online

Has Free Search

Has Chargeable Data

SpringerMaterials is a data collection on physical and chemical properties of materials from all fields of physics, chemistry, engineering, materials science and related disciplines (more than 3,000 properties of over 290,000 substances or material systems based on more than 1 million literature references).
Material Classes Metals, Non-Metallic Inorganic Materials, Polymers, Bio-based materials, Composite Materials, Advanced materials
Links website | DBIS link