MSDS: Blockout Compound

• Chemical Name: Silicone Rubber
• Chemical Family: Polysiloxane
• Formula: Mixture

Hazardous Ingredients/Identity Information

Ingredient	Weight %	CAS Number	OSHA PEL	ACGIH TLV
Octamethylcyclotetrasiloxane	1.202	556672	10 PPM	10 PPM
Silica-amorphous, Fumed	19.376	112945-52-5	6 MG/M3	3 MG/M3
Di-Me, Ethoxy-Terminated	2.055	70851-25-1	Not. Det.	Not. Det.

Physical/Chemical Characteristics

• Boiling Point: N/A
• Vapor Pressure: N/A
• Melting Point: N/A
• Vapor Density (Air=1): N/A
• Evaporation Rate: N/A
• Solubility in Water: Insoluble
• Specific Gravity: 1.12
• % Volatiles (by vol.): <10
• Evaporation Rate: N/A
• Physical State: Solid
• Appearance and Odor: Soft, natural, solid. Slight odor.

Fire and Explosion Hazard Data

• Flashpoint: N/A
• Auto Ignition Temperature: N/A
• Flammable Limits in Air - Lower (%): N/A
• Flammable Limits in Air - Upper (%): N/A
• Extinguishing Media: All standard fire fighting media
• Special Fire Fighting Procedures: Standard fire fighting practices including self contained breathing apparatus to protect against potentially toxic fumes.

Reactivity Data

• Stability: Stable under normal conditions of storage and use.
• Hazardous Decomposition Products: Carbon monoxide, Carbon dioxide, Formaldehyde, Silicon dioxide
• Hazardous Polymerization: Will not occur.
• Incompatibility: Keep away from strong oxidizing agents.
• Conditions to Avoid: Excessive temperatures.

Emergency First Aid Procedures

• Inhalation: Not expected
• Skin: In case of skin contact, wash affected area with soap and water.
• Ingestion: If swallowed, contact physician.
• Eyes: In case of contact, flush eyes with plenty of water for at least 15 minutes and get medical attention if irritation persists.

Health Hazard Data

• Ingestion: May be harmful if swallowed.
• Skin Contact: Irritation is not expected, but may occur in sensitive individuals.
• Inhalation: May cause irritation. See note above.
• Eye Contact: May irritate eyes.
• Medical Conditions Aggravated: None known.
• Chronic Effects of Overexposure: None known under normal use. See note below.
• Other: This product contains methylpolysiloxanes which can generate formaldehyde at approximately 302ºF (150ºC) and above in atmospheres which contain oxygen. Formaldehyde is a skin and respiratory sensitizer, eye and throat irritant, acute toxicant, and potential cancer hazard. Refer to 29 CFR 1910.1048 for regulations regarding monitoring and control of formaldehyde in the workplace.

Precautions for Safe Handling and Use

• Steps to be taken in Case Material is Released or Spilled: Sweep or scrape up spilled material and place in container for disposal.
• Waste Disposal: Dispose of in accordance with all applicable federal, state and local regulation.

Control Measures

• Respiratory Protection: None known.
• Skin Protection: Cloth or rubber gloves are recommended. Persons using product should wash their hands and face prior to eating, drinking or using tobacco products.
• Eye Protection: Safety glasses or goggles are recommended.
• Other Protective Equipment: None known.
• Ventilation: Use mechanical ventilation during molding and postcuring. Postcuring in a closed oven may liberate explosive concentrations of gas. Use properly designed equipment.

Storage and Handling

• Storage Temperature: Ambient to 50ºC (122ºF)
• Shelf Life: N/A
• Handling and Storage Precautions: Take precautions to avoid breathing vapors released during processing and curing. Store in original containers in a cool, dry location. Store away from food or beverages.

The information contained herein is furnished without warranty of any kind. Users should consider these data only as a supplement to other information gathered by them and must make independent determination of suitability and completeness of information from all sources to assure proper use and disposal of these materials and the safety and health of employees and customers and the protection of the environment.

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