Dipping and Coating Operations (Diptanks)

Chapter 296-835, WAC

Effective Date: 10/01/02

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WAC 296-835-140

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Select a Rule Name:


American Conference of Governmental Industrial Hygienists.

Adjacent area

Any area within 20 feet (6.1 m) of a vapor area that isn't separated from the vapor area by tight partitions.


American National Standards Institute.


Approved or listed by a nationally recognized testing laboratory. Refer to federal regulation 29 CFR 1910.7, for definition of nationally recognized testing laboratory.

Autoignition temperature

The minimum temperature required to cause self-sustained combustion without any other source of heat.

Combustible liquid

A liquid having a flashpoint of at least 100F (37.8C) and below 200F (93.3C). Mixtures with at least 99% of their components having flashpoints of 200F (93.3C) or higher aren't considered combustible liquids.


A process for removing excess wet coating material from the bottom edge of a dipped or coated object or material by passing it through an electrostatic field.

Dip tank

A container holding a liquid other than plain water that is used for dipping or coating. An object may be immersed (or partially immersed) in a dip tank or it may be suspended in a vapor coming from the tank.

Flammable liquid

Any liquid having a flashpoint below 100F (37.8C), except any mixture having components with flashpoints of 100F (37.8C) or higher, the total of which make up 99% or more of the total volume of the mixture.


The minimum temperature at which a liquid gives off a vapor in sufficient concentration to ignite when tested by any of the measurement methods described in the definition of flashpoint in the Safety and Health Core Rules, WAC 296-800-370.

Lower flammable limit

The lowest concentration of a material that will propagate a flame. The LFL is usually expressed as a percent by volume of the material in air (or other oxidant).


National Fire Protection Association.

Vapor area

Any area in the vicinity of dip tanks, their drain boards or associated drying, conveying, or other equipment where the vapor concentration could exceed 25% of the lower flammable limit (LFL) for the liquid in the tank.


Means the employer. See the definition of employer in the safety Safety and Health Core Rules, WAC 296-800-370.

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