Ceiling Limit : 2 mg/m³

TLV BASIS - CRITICAL EFFECT(S) : Irritation

NOTE: In many Canadian jurisdictions, exposure limits are similar to the ACGIH TLVs. Since the manner in which exposure limits are established, interpreted and implemented can vary, obtain detailed information from the appropriate government agency in each jurisdiction.

Sodium hydroxide solutions will not burn or support combustion. However, reaction of sodium hydroxide with water and a number of commonly encountered materials can generate sufficient heat to ignite nearby combustible materials. Sodium hydroxide can react with metals, such as aluminum, tin and zinc, to form flammable hydrogen gas.

Normally stable. Sodium hydroxide rapidly absorbs carbon dioxide from the air (forming sodium carbonate).

Water.

Sodium hydroxide in solution is odourless. It does not have an odour threshold.

POOR - sodium hydroxide has no odour.

This material is EXTREMELY CORROSIVE and HIGHLY REACTIVE. Before handling, it is important that engineering controls are operating and that protective equipment requirements and personal hygiene measures are being followed. People working with this chemical should be properly trained regarding its hazards and its safe use.

Use the smallest possible amounts in a designated area separate from the storage area with adequate ventilation. Immediately report leaks, spills or failures of the engineering controls. Inspect containers for damage or leaks before handling. Use the type of containers recommended by the manufacturer. Unprotected persons should avoid all contact with this chemical including contaminated equipment. Do not use with incompatible materials such as strong acids, nitroaromatic, nitroparaffinic or organohalogen compounds and metals such as aluminum, zinc and tin. Protect from unintentional contact with water. Never add water to a corrosive. Always add corrosives to water. When mixing with water, stir in small amounts slowly. Use cold water to prevent excessive heat generation.

Avoid generating mist. Use corrosion-resistant transfer equipment when dispensing. Never transfer liquid by pressurizing original container with air or inert gas. Cautiously dispense into sturdy containers made of compatible materials.

Never return contaminated material to its original container. Immediately contact the chemical supplier/manufacturer for handling instructions if drums of caustic appear to be swollen.

Label containers. Keep containers closed when not in use. Empty containers may contain residues which are hazardous. Have emergency equipment (for fires, spills, leaks, etc.) readily available. Follow the handling precautions on Material Safety Data Sheet. Practice good housekeeping. Maintain handling equipment. Comply with applicable regulations.

Engineering methods to control hazardous conditions are preferred. General methods include mechanical ventilation (dilution and local exhaust), process or personnel enclosure, control of process conditions and process modification (e.g. substitution of a less hazardous material). Administrative controls and personal protective equipment may also be required.

Use a corrosion-resistant ventilation system separate from other exhaust ventilation systems. Exhaust directly to the outside. Use local exhaust ventilation, and process enclosure if necessary, to control airborne dust and mist. Supply sufficient replacement air to make up for air removed by exhaust systems.