Ask the Expert Archive: Ultraviolet (UV) and Ultrasound

Choose a question below to view answers provided by ETAC's experts. If you have a question about Ultraviolet (UV) or Ultrasound, submit your question to the expert, then visit our "Ask the Expert" page next Thursday for your answer.

Does the conversion from solvent-borne to UV coatings result in a cost savings?
What is meant by the term 100% solids?
Does the use of UV coatings increase the exposure to toxic or hazardous chemicals?

Archive of Questions and Answers

Does the conversion from solvent-borne to UV coatings result in a cost savings?
UV coatings are more expensive on a cost per gallon basis. Generally, they are two to four times as expensive. Other considerations must be addressed. They include the following savings that more than make up for the per gallon cost:

• There is no carrier solvent. The UV coatings are 100% solids.
• The cure cycle is in seconds for flat line coatings systems and thirty seconds for three-dimensional applications.
• The curing step is a lower energy application.

Heating and cooling within the plant are more easily controlled, therefore reducing energy requirements.

What is meant by the term 100% solids?
Most coatings have high molecular weight resins that are transported by solvents that will evaporate after application. UV systems have active diluents or monomers that when subjected to UV exposure become part of the protective coating.

Does the use of UV coatings increase the exposure to toxic or hazardous chemicals?
When using UV systems, personal hygiene is similar to applying solvent-borne coatings. Skin sensitivity is a concern and an operator must wear protective long sleeve clothing and gloves. When spraying, the proper respirator must be worn.