Cleaning Solvents 101: What is a Solvent Evaporation Rate?

Simply put, solvent evaporation rate is the rate at which a solvent evaporates ? the process of changing from liquid into vapor ? compared to the evaporation rate of another substance. Evaporation quantity is thus expressed as a ratio instead of in units.

The evaporation rate of water is a commonly used reference point for determining the “slow” or “fast” evaporation rate of solvents. A high rate or a low rate of evaporation is neither good nor bad. Rather, the impact of solvent evaporation rate depends on how a solvent is used, and whether its ingredients that evaporate are good or bad for workers and the environment.

Evaporation Rate: Fast and Slow

A solvent that has a high evaporation rate doesn’t possess the characteristic on accident. The product is formulated for an application that may deal with a specific product or area of products, such as a type of aeronautical equipment or general surfaces for aeronautical equipment.

From a chemical perspective, a fast evaporation rate is usually preferred for cleaning any product that has a low tolerance for moisture on the parts ? even for short periods of time. Electronics immediately come to mind. The presence of residual moisture can cause electrical equipment to short circuit and may lead to oxidation if trapped between part fittings.

From a practical perspective, a fast evaporation rate is preferred for two reasons, among others. First, so long as the solvent is efficacious for the application, the cleaning process is highly efficient. Second, a product with a fast solvent evaporation rate doesn’t contribute to the waste trap. The long-term financial benefit depends on how many of your solvents are fast evaporating versus how many are not.

Evaporation Rate: Potential Issues

If there’s a downside to a fast solvent evaporation rate, it’s that some fast-evaporating solvents have ingredients you’d rather not have in the air of the work environment. Even solvents that don’t have a toxic safety profile can release vapors that cause temporary ailments, such as coughing, watery eyes, and dizziness. They’re minor maladies, but they thwart productivity.

If you need to use a solvent that has these effects, taking two steps can help fix the productivity issue: Using an air filtration system that senses and removes airborne contaminants, and equipping workers with personal protective equipment (PPE) that is acceptable for the exposure risk. Alternatively, you could order a custom solvent that eliminates some safety concerns.

In the Market for New Solvents?

If so, we’d like to hear from you. Ecolink specializes in environmentally safe and environmentally preferred industrial solvents. Our solvents are designed to replace older, hazardous solvents, without sacrificing efficacy for safety. In addition to providing an array of stock solvents, we create custom formulations for users who require other than what a stock product provides.

For more information on solvent evaporation rate and our products and services, call us today at 800-563-1305, or send us an email through our contact form. We look forward to providing assistance and supplying a free test sample for the solvent of your choice!



The Good, Bad, and Ugly of Evaporating Solvents

Evaporating solvents: If you use the term as a general classification for solvents that readily evaporate, you come up with a group of products in which it seems almost every solvent belongs. The fact that most solvents evaporate — some at a remarkably high or low rate — is good in some contexts and bad in others. There’s also a context in which the bad can become downright ugly. From an industrial user’s point of view, here are the good, bad, and ugly of evaporating solvents.

The Good

Evaporating solvents generally possess one of two benefits when it comes to evaporation rate: They evaporate slowly and have a long exposure time to the cleaning surface, which helps break down thick accumulations; or they evaporate quickly, preventing parts from oxidizing and expediting soil removal for applications that demand a quick turnaround time, (e.g. degreasing the engine of an airliner or military jet that must return to the runway shortly.)

Evaporation rate is a good example of a solvent characteristic that impacts the performance of a solvent beyond its chemical efficacy. Moreover, in what seems like circular reasoning, the formulation of a solvent determines how quickly it evaporates, and the solvent’s evaporation rate partly determines the efficacy of the formulation.

The Bad

Evaporating solvents can only remove soils that they evaporate slowly enough to break down. Sometimes, breaking up soils requires a good soaking; while other applications demand the opposite: fast evaporation. If you try to use a fast evaporating solvent for an application that requires a minutes of contact time between the solvent and cleaning surface, you could go through can after can and still not complete the job.

By the same token, a slow evaporation rate can doom applications that require a fast drying solvent. For instance, you don’t want switchgear to be wet when it’s reenergized after a good degreasing, and you don’t want precision parts to start rusting because water from an aqueous solvent hides in metal crevices.

The Ugly

The ugliest part of solvent evaporation is when injuries or financial losses result directly from using a solvent that has the wrong evaporation rate for the application.

In many industrial work settings, injury and financial loss are one in the same; worker injuries lead to sick days, workers comp, legal settlements, etc. Respiratory damage and slip-and-fall events are injuries that can result at least partly from how quickly certain solvents evaporate. As for respiratory damage, it depends entirely on the solvent that is evaporating.

About Ecolink

Ecolink is a supplier of environmentally safe and environmentally preferred, competitively priced solvents. We have many replacements for hazardous, regulated solvents, which demonstrate equal or better efficacy than what they replace. We also formulate custom solvents for the needs of specific users, and provide free test samples of any solvent we sell, stock or custom.

For more information about our products and services, call us today at 800-563-1305, or send us an email through our contact form. We look forward to hearing from you!