As per timber grading (IS 6543): The modulus of elasticity E is determined by conducting the bending test on a standard specimen. Timber on this basis, is classified as: Group A : If E ≥ 12.5 kN/nm‌2 Group B : If E = 9.8 to 12.5 kN/mm‌2 Group C : If E = 5.6 to 9.8 kN/mm‌2