I am seeing a double toothed sharp medium to strong signal centered way out around 3680-3700 cm-1 seen in an undesirable build up on machinery from a rubber formulation. I do not see this signal in the individual components of the formula, the closest is from a ~3400 cm-1 centered signal in a rosin tackifier. I am trying to minimize this build up, and I suspect the source of this unique signal is critical to identifying it