I am using UV/ozone (ambient air) to treat my pdms to bond them. We have been using it since last 9 years. Recently, I kept two pdms devices inside for treatment, one got treated with contact angle reduced to 30 degrees but other one just reduced to 58 degrees from 104 degrees after 2 hrs of treatment at room temperature. I don't know why there is a difference in contact angle of between the two which were made using same pdms mixture. Can you please tell me if I need to replace uv ozone lamp or is it some other problem.

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