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Above 420 Â°C, silane decomposes into silicon and hydrogen; it can therefore be used in the chemical vapor deposition of silicon. The SiâH bond strength is around 384 kJ/mol, which is about 20% weaker than the HâH bond in H 2. Consequently, compounds containing SiâH bonds are much more reactive than is H 2.ilane is the silicon analogue of methane. Because of the greater electronegativity of hydrogen in comparison to silicon, this SiâH bond polarity is the opposite of that in the CâH bonds of methane.