ETV Logo

ENVIRONMENTAL SAFETY --- More detail about GB 38508-2020

Since the introduction of the Smart Sonic Stencil Cleaning Process in 1990, the process has been evaluated and tested by recognized experts in the field of surface mount technology and by authoritative regulating agencies such as the EPA, Cal/EPA and AQMD. No other process in the electronics industry has met these high standards or been renowned by so many. Customers can rest assured that their decision to use Smart Sonic is the right decision and that the process is confirmed safe, effective, fast, economical and environmentally correct.

In 1998, Smart Sonic submitted its Stencil Cleaning Process to the U.S. Environmental Protection Agency and the California Environmental Protection Agency for the thorough evaluation. A representative automatic stencil cleaner (Model 4200) and a representative manual stencil cleaner (Model 2000) were evaluated using Smart Sonic's non-hazardous 440-R SMT Detergent.

While the California EPA Certification data is valid for a period of three years, the U.S. EPA Verification of that data is permanent and does not expire (see letter from the Cal/EPA DTSC below). Recertification of the California EPA data would be important and necessary only if the overall process has changed or a different chemistry was used.

The Smart Sonic Stencil Cleaning Process is the only stencil cleaning process to meet the "Test of Time" and has not changed since its introduction in 1990. Only the appearance and user friendliness of the machines have been improved to lower chemistry consumption, generate less wastewater and facilitate easier loading and unloading, etc.

Today, Smart Sonic remains the only stencil cleaning process ever to pass California EPA Certification and complete the US EPA's ETV Program. No other stencil cleaner manufacturer or cleaning process has been able to meet these stringent guidelines.

The following is a copy of the California EPA Certificate and the official Verification Statement of the U.S. Environmental Protection Agency:

Office of Research and Development

Washington, D.C. 20460


PHONE:(805) 499-7440
FAX:(805) 375-5781

The U.S. Environmental Protection Agency has created a program to facilitate the deployment of innovative environmental technologies through performance verification and information dissemination. The goal of the Environmental Technology Verification (ETV) Program is to enhance environmental protection by substantially accelerating the acceptance and use of innovative, improved, and more cost-effective technologies. The ETV Program is intended to assist and inform those individuals in need of credible data for the design, distribution, permitting, and purchase of environmental technologies. This verification statement provides a summary of performance results for the Smart Sonic Aqueous Cleaning Systems, registered trademark SMARTSONIC®.


The EPA's ETV Program, in partnership with recognized testing organizations, objectively and systematically documents the performance of commercial ready environmental technologies. Together, with the full participation of the technology developer, they develop plans, conduct tests, collect and analyze data, and report findings. Verifications are conducted according to a rigorous workplan and established protocols for quality assurance. Where existing data are used, the data must have been collected by independent sources using similar quality assurance protocols. EPA's ETV Program, through the National Risk Management Research Laboratory (NRMRL), has partnered with the California Department of Toxic Substances Control (DTSC) under an ETV Pilot Project to verify pollution prevention, recycling, and waste treatment tecnonlogies.


Smart Sonic Corporation developed the Model 2000 and Model 4200 ultrasonic aqueous cleaning systems to replace 1, 1, 2-trichloro-1, 2,2-trifluoroethane (CFC-113), 1,1,1-trichloroethane (1,1,1-TCA) and isopropyl alcohol (IPA) based systems used in the electronics industry to clean various types of solder pastes from printed circuit board stencils.

Smart Sonic's stencil cleaning technology consists of Smart Sonic's proprietary 440-R SMT Detergent®, ultrasonic generator and 40 kHz piezoelectric transducers, stainless steel wash tank, rinse tank (included in semi-automated system), and control devices.

The semi-automated Model 2000 system is approximately 3 feet high with a 40 x 44 inch base. This unit has a separate wash tank and a manual rinse station. The automated Model 4200 system is approximately 50 inches high with a 36 x 62 inch base. The pneumatic lift used on this model extends 36 inches for a total system height of 86 inches. This system has one tank for washing with an automated rinse over the wash tank.

The combination of Smart Sonic's 440-R SMT Detergent and ultrasonics enables the removal of solder pastes from printed circuit board stencils. Detergent surfactants act as wetting agents to saturate the solder paste layer that is left on the stencil surface (from solder paste printing operation). The ultrasonics then produce an intense scrubbing action, through cavitation and implosion of microscopic bubbles that enhances removal of the saturated solder paste layer. Ultrasonics are often more effective in cleaning hard-to-reach surfaces (i.e., small stencil apertures) than brushes and hand wipes. The cleaning bath is operated at room temperature, eliminating any potential effects to the stencil from cleaning solutions requiring higher temperatures.


Between May and September 1998, an evaluation of two ultrasonic aqueous cleaning systems, developed by the Smart Sonic Corporation, was conducted using field and laboratory qualitative and quantitative data. The aqueous cleaning systems include Smart Sonic's Model 2000 and Model 4200 systems. The objectives of this evaluation were to verify, through independent sources, the following performance parameters:

The evaluation consisted of:

Details of the evaluation, including data summaries and discussion of results may be found in the report entitled 'US EPA Environmental Technology Verification Report, Smart Sonic Aqueous Cleaning Systems, SMARTSONIC® (EPA/600/R-99/004)."


Performance results of Smart Sonic Corporation's aqueous cleaning systems, Model 2000 and Model 4200, are as follows:

Results of the verification show that the Smart Sonic ultrasonic aqueous cleaning systems, Model 2000 and 4200, are capable of removing RMA (rosin mildly activated), no-clean, and water washable solder pastes from printed circuit board stencils such that no solder paste remains in stencil apertures at 10X magnification, provided that end-users follow Smart Sonic's cleaning guidelines. The Model 2000 and 4200 cleaning systems do not contain select volatile organic compounds and halogenated compounds above detection limit of 0.01% (v/v) using SCAQMD's CAS Certification Protocol (April 1997). End-users should follow Smart Sonic's operational and saety guidelines.

End-users should contact their stencil manufacturer prior to changing their cleaning process. Changing from solvents to aqueous cleaning systems may require stencil modifications to make the cleaning system and stencil compatible. In addition, the end-user should contact his/her local, state, or federal regulatory authority regarding management of spend hazardous wastes generated from use of the Smart Sonic aqueous cleaning systems (i.e., spent cleaning baths, rinse baths, and solids containing lead).

E. Timothy Oppelt James T. Allen, Ph.D., Chief
DirectorOffice of Pollution Prevention
National Risk Management Laboratory and Technology Development
Office of Research and DevelopmentDepartment of Toxic Substances Control
United States Environmental
Protection Agency
California Environmental Protection Agency

NOTICE: Verifications are based on an evaluation of technology performance under specific, predetermined criteria and the appropriate quality assurance procedures. EPA and Cal/EPA make no expressed or implied warranties as to the performance of the technology. The end-user is solely responsible for complying with any and all applicable federal, state, and local requirements.

Availability of Verification Statement and Report

Copies of the Public Verification Statement (EPA/600/R-99/004VS)
and Verification Report (EPA/600/R-99/004) are available from the following:

(Note: Appendices are not included in the Verification Report.
Appendices are available from DTSC upon request.)

        1. US EPA / NSCEP
        P.O. Box 42419
        Cincinnati, Ohio 45242-2419

        Web site: (electronic copy) (order hard copy)

        2. Department of Toxic Substances Control
        Office of Pollution Prevention and
        Technology Development
        P.O. Box 806
        Sacramento, California 95812-0806

        Web site:
        or (Click on "Verified Technologies")

The Smart Sonic Stencil Cleaning Process is listed by the Oregon Department of Environmental Quality (DEQ) as an Alternative Cleaning Process. Please visit the Oregon DEQ website for details:

October 16, 1997

Mr. William Schreiber
Smart Sonic Corp
14141 Covello Street, Bldg. 4-C
Van Nuys, California 91405

Subject: Clean Air Solvent (CAS) Certification

Dear Mr. Schreiber:

Your submitted product(s) have successfully met all of the requirements for a Clean Air Solvent Certificate from the South Coast Air Management District (AQMD). The certification will be valid for five (5) years from the date of issuance and may be renewed upon recertification by the AQMD. The following product(s) will be classified as CAS(s) by the AQMD:

This certificate should not be represented as an enorsement of the product(s) or as a representation as to its cleaning ability. The user should also be advised that there may be other options available for compliance with the requirements of the specific applicable AQMD rule or regulation.

A CAS certificate will be issued for each qualifying product in the near future. Congratulations and our sincere thanks for your help in cleaning up the air! If you have any questions, please contact Mr. Louis Yuhas (909) 396-2475.


Anupom Ganguli, Ph.D.
Senior Manager
Stationary Source Compliance

Smart Sonic's 440-R SMT Detergent is certified as a "Clean Air Solvent" by the South Coast Air Quality Management District CAS Program.

CAUTION: The Clean Air Solvent (CAS) Program only certifies the chemistry. If a CAS chemistry is used in a hazardous stencil cleaning application (lead) the resulting waste stream is not CAS certified. Only the Environmental Technology Verification (ETV) Program of the EPA tests and verifies complete processes.

21865 E. Copely Dr., Diamond Bar, CA 91765-4182


TO: Anupom Ganguli, Sr. Manager
VOC Rules and NSR
Stationary Source Compliance


    440-R SMT Detergent
SAMPLE Smart Sonic Corp.
SOURCE: 2373 Teller Road, #107
Newbury Park, CA 91320
LABORATORY NO. 92597-02-001





    Clean Air Solvent (CAS) eligibility determination by SCAQMD Method 313-91.

    All Analyses were performed on the product received.

There were no VOHAP, ODC, GWC or VOC detected.

    Conclusion: The product meets CAS criteria.

Date Approved: 10/14/97Approved by: Rudy Eden, Sr. Manager
Laboratory Services

The Smart Sonic SMT Screen/Stencil Cleaning Process is the only truly environmentally safe cleaning process. California's Air Quality Management District has certified Smart Sonics's 440-R SMT Detergent as a "Clean Air Solvent" (1997).

Most people will agree that California is the most environmentally regulated area in the world. The regulating agency in Northern California (Silicon Valley) is the Bay Area Air Quality Management District (BAAQMD). The BAAQMD has exempted the Smart Sonic Cleaning Process from all permit requirements because of it's environmental compatibility!

The following is a letter from the BAAQMD to a Smart Sonic customer in the Silicon Valley area:

December 24, 1991

Dear Mr. Marsh:

We have determined the following equipment to be currently exempt from District permit requirements per Regulation 2-1-118.5:

Screen/Stencil Cleaning System, Smart Sonic.

Note that the exemption is not permanent, and apply only to permit requirements. A change in your operations, such as usuing materials other than Smart Sonic 440-R Solderpaste Remover, or a revision of District Regulations, may require you to obtain permits in the future. You must continue to comply with all other applicable District regulations.

Please keep a copy of this letter on-site as a record of the exemption status of the above equipment.

Very truly yours,

Barry G. Young
Air Quality Engineer II
Permit Services Division


Client Name: Equipment Sciences, Inc. (Smart Sonic Corp.)
Matrix: Waste water
Client ID: N/A.
L & R ID# OW-0474

Date sampled: 9/6/90
Date received: 9/6/90
Date analyzed: 9/20/90
Date reported: 9/25/90

Waste Water Effluent19 mg/LEPA 239.2
Distillate< 0.2 mg/LEPA 239.2
< = less than

LEE & RO Environmental Laboratories

Ek Han Kwee, Ph.D.
Technical Director

21st January 1992

Mr. Phil Nelson
Product Equipment Sales Ltd
Newcastle upon Tyne

Our Ref. NS/1/82

Dear Mr. Nelson

Re:-SmartSonic 440-R Detergent

None of the components in the above preparation require notification under the above regulations and therefore no action, by yourselves, is necessary.

Yours sincerely

James Pemberton
Health and Safety Executive

The Smart Sonic SMT Screen/Stencil Cleaning Process is not only environmentally safe, it is the safest way for personnel to clean solder paste. There is no hot water to scald personnel, the are no hazardous vapors to breathe and the are no concerns about combustibility and/or explosion as there are with systems using alcohol and terpenes.

6724 Eton Avenue · Canoga Park, CA 91303 · U.S.A.

TEL: (852) 22320623/23140038 · FAX: (852) 23140048
E-mail: · Web Site:

RETURN to SMarT Sonic Home Page

c 2020 SMarT Sonic Corp.