Arcose presented to a packed house at the BCCSA Occupational Disease Symposium hosted by the BCCSA and WorkSafeBC. Sensitizers are finding their way into workplaces at an increasing rate because of their diverse applications. Often workers are not aware that that they are handling a sensitizing chemical. We discussed what makes something a sensitizer, what the health effects are, the types of materials used in construction that contain sensitizing agents and how workers protect themselves. We learned about a “new hazard” in some of the most common products used in the construction industry.