Solvent Alternative

Get The Right Cleaning Solvent Alternative

Sustainability and regulatory concerns are driving companies to look for alternatives to traditional solvents like 1-bromopropane (NPB), Trichloroethylene (TCE), perchloroethylene (PCE/ PERC), and Methylene Chloride for metal parts cleaning and degreasing. Hubbard-Hall has been helping manufacturers tackle these issues with lower-impact solvents or aqueous cleaning chemistries.

Insight
Proof
Contact

Why Switch to an Alternative?

On December 20, 2019, the EPA finalized the designation of 20 chemical substances as “high priority for risk evaluation” under the Toxic Substance Controls Act (TSCA). Included are Methylene chloride, Perchloroethylene (PCE/ PERC), N-Propyl Bromide (NPB) – which the EPA refers to as 1-bromopropane – and Trichlorethylene (TCE).

Today, these chemicals are moving through the process required by TSCA to evaluate any unreasonable risks they may present to human health or the environment. The next step is risk management of these existing chemicals in order of priority. There are several actions EPA could take to address the unreasonable risk, including regulations prohibiting or limiting the manufacture, processing, distribution, commercial use, or disposal of the chemical substance, as applicable.

Current Regulatory Status: September 2024

In October 2023, EPA proposed a risk management rule to address unreasonable risk posed by trichloroethylene (TCE) to human health, including the final revised risk determination for TCE

In June 2023, EPA proposed to ban most uses of PCE and establish a workplace chemical protection program (WCCP) for uses not prohibited to address the unreasonable risk to human health.

Also known as 1-bromopropane (1-BP), In December 2022, EPA released a final revised risk determination for 1-BP. The final revised risk determination finds that 1-BP, as a whole chemical, presents an unreasonable risk of injury to health under its conditions of use. Risk evaluation for 1-Bromopropane

EPA finalizes regulations under the TSCA to manage the risks associated with methylene chloride. The regulations include prohibitions on the manufacturing, processing, and distribution of methylene chloride for consumer uses. Additionally, most industrial and commercial uses, including paint and coating removers, are prohibited. Strict workplace protections are established through the Workplace Chemical Protection Program to ensure the safety of workers in remaining uses.

18 Months After Finalization (Estimated Later 2025): Workplaces will have approximately 18 months from April 2024 to comply with the Workplace Chemical Protection Program. During this time, they must implement stringent workplace controls and periodically monitor their environments to ensure that workers are not exposed to harmful levels of methylene chloride.

Future: EPA plans to hold webinars to educate stakeholders about the final risk management rule and will develop guides to help small businesses comply with the regulations. Opportunities for public and stakeholder engagement will be provided, including one-on-one meetings with EPA representatives and access to email alerts and public dockets for updates and information.

Current Status of Traditional Halogenated Solvents

Solvent	EPA Rule Status	Rule Date	OSH (PEL) ppm	ACGIH (TLV) ppm	EPA (ECEL) ppm	Date Rule to be Enacted	Vapor Degreasing Allowed?	Notes from Federal Register
MEC	Final	5/8/2024	25	50	2	4/28/2026	NO; except for NASA & federal use	All uses prohibited except Federal exemptions
TCE	Proposed	10/31/2023	100	25	0.004	270 days after final rule	NO; except for NASA & federal use	Prohibition for most consumer and industrial use
PCE	Proposed	6/16/2023	100	25	0.14	24 months after final rule	Yes, with WCPP*	Prohibition for most consumer and industrial use
NPB	Proposed	8/8/2024	n/a	0.1	0.05	n/a	Yes, with WCPP*	Public comments accepted until 9/23/2024

* Workplace Chemical Protection Program – EPA enhanced safety protocols to including stringent exposure thresholds and control plans, workplace monitoring, worker training. PPE program implementation and record keeping.

Date: September 2024

Which is the Right Choice for You?

Next-Gen Solvents

Solvent cleaning or vapor degreasing is a process in which an organic solvent is used to dissolve organic contaminants on the component.

More environmentally friendly solvents such as modified alcohols (Dowclene™ and Dualene™) can be used in a vacuum degreaser for cost savings, safety, and efficacy. This type of solvent cleaning will require capital investment, including the purchase of a vacuum degreaser.

Tergo™ is a precision cleaning fluid that is a non-flammable, thermally and hydrolytically stable cleaner that can be dropped into an open-top vapor degreaser with minimal changes or retrofitting.

Aqueous Cleaners

Aqueous cleaning is a water-based process that utilizes chemical additives, surfactants, and rinsing to remove contaminants.

We offer 70+ water-based chemistries for any soil, substrate, or cleaning process. With a transition to aqueous cleaning, you should consider how this will impact your process with the use of heat, multiple tanks, drying time, and increased footprint.

Cleaning celebrity, Mike Valenti, joined our podcast for a 2-part series on this very topic.

Watch Part 1

Watch Part 2

Cleaning is a Process

Although chlorinated/fluorinated/brominated solvents have advantages in precision cleaning, there are other methods for removing soils from the surface of metal. Cleaning is considered a process because it is not just about the chemistry – good cleaning depends on several factors:


• Metal type	• Throughput requirements
• Soil type	• Energy demands
• Parts geometry	• EHS and regulatory
• Available footprint	• Waste handling
• Application cleanliness requirements	• Cost