previous topic
Ether
Glossary Index
Glossary Index
next topic
Exothermic
MSDS
Topics
Free Sites FAQ's Regulations Glossary Software Suppliers
Books Forum Poll Fun stuff Quiz Store
Understand your MSDS with the MS-Demystifier Search ALL our MSDS info

Evaporation Rate

Definition

GHS flame over circle pictogram

Get your GHS-compliant labels and signs from Safety Emporium.

SDS Relevance

Evaporation rate can be useful in evaluating the health and fire hazards of a material. For example, a substance with a high evaporation rate will readily form a vapor which could be inhaled or explode.

Evaporation rates generally have an inverse relationship to boiling points; i.e. the higher the boiling point, the lower the rate of evaporation.

The general reference material for evaporation rates is n-butyl acetate (commonly abbreviated BuAc) which has the chemical structure shown below. Whenever a relative evaporation rate is given, the reference material must be stated.

chemical structure of n-butyl acetate

The relative evaporation rate of butyl acetate is 1.0. Other materials are then classified as:

Speed
Evaporation Rate
(BuAc = 1.0)
Examples
Fast
> 3.0
Methyl Ethyl Ketone = 3.8
Acetone = 5.6
Hexane = 8.3.
Medium
0.8 to 3.0
95% Ethyl Alcohol = 1.4
Naphtha = 1.4
Slow
< 0.8
Xylene = 0.6
Isobutyl Alcohol = 0.6
Water = 0.3
Mineral Spirits = 0.1

We are not aware of a specific number for the absolute evaporation rate (i.e. in mass/time units) of butyl acetate. Presumably, such a number would depend on myriad variables such as temperature, atmospheric pressure, humidity, air flow, viscosity etc. The ASTM has developed a standard test method, D3539-87(2004) Standard Test Methods for Evaporation Rates of Volatile Liquids by Shell Thin-Film Evaporometer. We don't own a copy so we can't give you a synopsis of the variables involved.

In the absence of evaporation rate data, you can roughly assess the volatility using the vapor pressure of the material. A number of models are available in the scientific literature; see Further Reading below for some examples.

Safe-T-Vent thermally-actuated damper for venting flammable storage cabinets

Vent your flammable storage safety cabinets safely with Safe-T-Vent thermally-actuated dampers from Safety Emporium.

Further Reading

See also: alcohol, boiling point, vapor pressure, volatility.

Additional definitions from Google and OneLook.



Entry last updated: Monday, February 3, 2020. This page is copyright 2000-2020 by ILPI. Unauthorized duplication or posting on other web sites is expressly prohibited. Send suggestions, comments, and new entry desires (include the URL if applicable) to us by email.

Disclaimer: The information contained herein is believed to be true and accurate, however ILPI makes no guarantees concerning the veracity of any statement. Use of any information on this page is at the reader's own risk. ILPI strongly encourages the reader to consult the appropriate local, state and federal agencies concerning the matters discussed herein.