Unit 11: Thermal Decomposition When Using Two-Component Low Pressure SPF.

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Presentation transcript:

Unit 11: Thermal Decomposition When Using Two-Component Low Pressure SPF

Grant Provided by the Occupational Safety and Health Administration (OSHA), U.S. Department of Labor (DOL) This material produced under grant SH SH1 from the Occupational Safety and Health Administration (OSHA), 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.

In this unit, you will learn about: Thermal decomposition and suggestions to help prevent it Welcome to Unit 11

Thermal Decomposition There is potential during spray polyurethane foam application for thermal decomposition.

Thermal Decomposition An example of thermal decomposition is when you microwave popcorn for too long and the kernels are charred. There is a burnt odor and charred appearance.

Thermal Decomposition of SPF - What can happen? What can happen if the foam is overheated? smoke and vapors may be produced the foam product can break down

Thermal Decomposition Heat given off during foam curing can result in possible scorching, smoldering or fire. (an example of scorched foam)

Thermal Decomposition of SPF Spray polyurethane foam can burn!

Thermal Decomposition- Finished Foam Carbon monoxideCarbon dioxideHydrogen cyanideNitrogen oxidesHydrocarbonsIsocyanic acidIsocyanateOthers Potential by-products of thermal decomposition of SPF include :

Preventing Thermal Decomposition Thermal decomposition can occur while spraying low pressure foam. Consider the following to prevent potential for thermal decomposition: refer to manufacturer’s instructions for specific information avoid spraying too thickly in any one lift/pass (up to 2” maximum is common) allow sufficient cooling time before applying the next lift/pass

Preventing Thermal Decomposition – Additional Considerations What are some additional ways to help prevent thermal decomposition of foam? no welding or sources of ignition near installed foam until it is covered with a thermal barrier (e.g., drywall) no cutting with a torch no smoking in the spray area

ABC Fire Extinguisher Keep an ABC fire extinguisher near the work zone.

Unit 11 Summary In this unit, you learned about: Thermal decomposition and suggestions to help prevent it

Unit 11 Review KnowledgeIntoAction

Unit 11: Q1 Debrief Which of the following is not true about thermal decomposition that can potentially occur when SPF is overheated? A.Heat given off during curing can result in possible scorching, smoldering and fire. B.Low pressure spray polyurethane foam will not burn. C.Smoke and vapors may be produced. D.SPF is formulated with flame retardants to meet building codes.

Unit 11: Q1 Debrief Which of the following is not true about thermal decomposition that can potentially occur when SPF is overheated? A.Heat given off during curing can result in possible scorching, smoldering and fire. B.Low pressure spray polyurethane foam will not burn. C.Smoke and vapors may be produced. D.SPF is formulated with flame retardants to meet building codes.

Unit 11: Q2 Debrief Which of the following is true regarding techniques to help prevent thermal decomposition of SPF? A.Keep the foam cool by turning up the fans. B.Follow manufacturer’s recommendation on lift thickness and time between lift/pass. C.Apply the foam in as thick a lift as possible. D.None of the above.

Unit 11: Q2 Debrief Which of the following is true regarding techniques to help prevent thermal decomposition of SPF? A.Keep the foam cool by turning up the fans. B.Follow manufacturer’s recommendation on lift thickness and time between lift/pass. C.Apply the foam in as thick a lift as possible. D.None of the above.

Unit 11 Completed  Continue to Unit 12  Return to the Main Menu