DISCLAIMER: This material was produced under grant number SH-19480-09 from the Occupational Safety and Health Administration, U.S. Department of Labor. It does not necessarily reflect the views or policies of the U. S. Department of Labor, nor does mention of trade names, commercial products, or organizations imply endorsement by the U. S. Government. The U.S. Government does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed.

COPYRIGHT INFORMATION: This material is the copyrighted property of University of Puerto Rico, Rio Piedras Campus. By federal regulation, OSHA reserves a license to use and disseminate such material for the purpose of promoting safety and health in the workplace. The University of Puerto Rico, Rio Piedras Campus hereby authorizes employers and workplace safety and health professionals to use this material, distributed by or through OSHA, in their workplaces or practices in accordance with the guidance contained in the material.

To this end, permission is granted to use such copyrighted material solely for non-commercial, instructional, personal, or scholarly purposes. The material may be used and incorporated into other workplace safety and health programs on the condition that no fee may be charged for the subsequent use of the material. Use of the material for any other purpose, particularly commercial use, without the prior, express written permission of the copyright owner/s is prohibited. Furthermore, any modification to the material is prohibited without the prior, express written permission of the copyright owners.