Enamel tensile strength

The first commercial applications of polypyromellitimides were as wire enamels, as insulating varnishes and for coating glass-cloth (Pyre.ML, Du Pont). In film form (Kapton) many of the outstanding properties of the polymer may be more fully utilised. These include excellent electrical properties, solvent resistance, flame resistance, outstanding abrasion resistance and exceptional heat resistance. After 1000 hours exposure to air at 300°C the polymer retained 90% of its tensile strength. 

Some other physical properties of enamel glass are density, from 2.5-3 5 g/mL Mohs hardness. 5-6 tensile strength. 3d-103 MPa (4.900-15.000 psi) compressive strength, 1380-2760 MPa(2-4x It)5 psil, modulus of elasticity. 55-83 GPa (8- 12x I06 psi) and dielectric constant, 5-10. 

Tensile strength for phosphoric acid-etched bovine enamel after standing for 2 weeks at 37°C in water. 

Thornton, J. B., Retief, D. H. Bradley, E. L. (1986). Fluoride release from and tensile bond strength of Ketac-Fil and Ketac-Silver to enamel and dentine. Dental Materials, 2, 241-5. 

N. Kanemura, H. Sano, J. Tagami, Tensile bond strength to and SEM evaluation of ground and intact enamel surfaces,/. Dent., 27, 523-530,1999. 

---