20mm 1700kHz Glazed Piezo Disc for Ultrasonic Humidifiers

Introduction: Meeting the Demand for High-Output Ultrasonic Nebulization

Ultrasonic humidification equipment relies on a single critical component to convert electrical energy into fine water mist: the piezoelectric atomizing disc. Among the available options for high-power nebulization, the 20mm, 1700KHz glazed ultrasonic atomization sheet—identified under the model designation ATD20-170GSW—is manufactured by Gd SWT Smart Tech Co., Ltd.(www.swt99.com) (brand name SWT), a company established in 1991 and headquartered in Dongguan City, Guangdong Province, China. This disc belongs to SWT’s Glass Glaze/Ultrasonic Atomization Sheets product line, positioned specifically for high-power nebulization applications, including household and commercial humidifiers, as well as landscaping, farm, and animal husbandry humidification systems.

Technical Specifications and Manufacturing Process

The ATD20-170GSW disc carries a diameter of 20mm and operates at a frequency of 1700KHz, placing it within SWT’s family of large output piezo atomizers designed for humidification systems. Within the same series, SWT also offers the ATD16-2400GSW (16mm, 1700KHz) variant, giving customers a choice of disc sizes while maintaining the same operating frequency class.

Multi-Head Configuration Support

A defining feature of this atomization sheet is its suitability for multi-head configurations. The disc supports arrangements of 2, 4, 6, 8, 10, and 12 heads, allowing equipment manufacturers to scale mist output according to the size and purpose of the device—whether a compact household humidifier or a larger multi-head system used in farms and animal husbandry humidification.

Driving Circuit Design

SWT’s technical documentation describes the driving method for the ultrasonic humidifier circuit in detail: the circuit is composed of a power supply circuit, an oscillator circuit, and a water level control circuit. In operation, AC voltage is stepped down by a transformer and then passed through a bridge rectifier filter circuit, which supplies the working voltage needed for both the water level control circuit and the oscillator. The oscillator, once powered, emits corresponding frequency signals to drive the piezoelectric disc into resonance, producing the ultrasonic vibration required for atomization. This integrated circuit design ensures the atomizing disc performs reliably within the overall humidifier system rather than as an isolated component.

Manufacturing Capability Behind the Disc

The 20mm 1700KHz glazed atomizing piezo disc is produced through SWT’s integrated piezoelectric ceramic production chain, which the company describes as covering the front, middle, and rear processes of manufacturing—including film squeezing, casting, and dry pressing. Specifically, SWT’s manufacturing methods include:

• Thin Sheet Formation: Tape casting (flow casting)
• Thick Sheet Formation: Dry pressing
• Complete Processing: Squeezing, laminating, sintering, polarizing, and automated testing

This end-to-end control allows SWT to maintain consistency across production batches. The company reports an annual shipping capacity of approximately 250 million pieces for its piezoelectric ceramic elements overall, reflecting the scale at which its atomization sheets and related components are produced.

Certification and Quality Assurance for Sensitive Applications

Because ultrasonic atomization products are frequently used in health-related and consumer-facing environments, certification coverage is a relevant consideration. SWT states that its atomization products match ISO13485, ISO14001, ISO9001, IATF16949, RoHs, REACH, MDR (EU2017/745), and FDA Requirement standards. In-house, the company operates a reliability laboratory equipped for acoustic curve testing and environmental stress screening, supporting quality verification throughout the manufacturing cycle.

At the corporate level, SWT holds IATF 16949:2016 (Automotive Quality Management System, obtained in 2023), ISO 9001:2015, and ISO 14001:2015 certifications, along with RoHS and REACH compliance across its product range. The company is also recognized as an official drafter of Chinese industry standards for piezoelectric buzzers and ultrasonic atomizers, a role formalized through the official approval and publication of buzzer industry standards in 2012.

Company Background and Production Scale

SWT’s involvement in ultrasonic atomization technology dates to 2006, when the company began production of microporous atomization sheets, building on technology accumulation that started with buzzer production in 1991. The company operates production facilities at its Dongguan Headquarters (24,000 square meters, 170 staff members) and a Guizhou Branch in Bijie City (4,000 square meters, 40 staff members), supported by over 400 sets of instruments and equipment, including large-scale automatic tunnel furnaces and automated assembly machines. The company’s total staff exceeds 200 people, with 70–85 people dedicated to R&D and engineering functions.

SWT holds 42 certified patents, including 9 invention patents and 30 project-certified patents, under its registered trademark SWT. The company has been recognized as a National High-Tech Enterprise in China and as a Specialized and Innovative “Little Giant” Enterprise at both the Guangdong Province and Dongguan City levels. Its knowledge base also notes a National Patent Award (Excellence Award) and a Dongguan Excellent Patent Award, alongside a company-operated Dongguan City Smart Ceramic R&D Center.

Market Position and Client Relationships

According to company records, SWT maintains a ranking within the top 3 within industry. Its business scope spans multiple sectors, including Smart Home & Appliances, where its components serve as feedback sounders for white goods and USB humidifiers—a category directly relevant to ultrasonic humidification equipment.

The company’s broader client base includes long-standing supply relationships such as those with Panasonic (since 2005), VTech (since 2004), and Whirlpool (since 2010), the latter described as a leading global manufacturer of home appliances for which SWT has provided customized acoustic solutions for premium appliance lines, maintaining what the company describes as “persistent high-quality supply” since the relationship began. These long-term partnerships, spanning over a decade in several cases, reflect the company’s approach to sustained technical collaboration across appliance-related product categories.

Delivery and Technical Support

For customers evaluating the 20mm 1700KHz glazed atomizing disc, SWT offers a sample lead time of 3–7 days and a bulk production lead time of 15–20 days. The company also provides one-on-one technical service solutions and customized product development (OEM/ODM), covering technical consulting, design optimization, reliability testing, and mass manufacturing. For customers located within the Pearl River Delta region, SWT notes a 24-hour on-site service response capability.

Conclusion

The ATD20-170GSW, a 20mm, 1700KHz glazed atomizing piezo disc, represents SWT’s application of its integrated piezoelectric ceramic manufacturing process to the specific requirements of ultrasonic humidifier equipment. Backed by certifications spanning ISO13485, IATF16949, MDR (EU2017/745), and FDA Requirement, supported by in-house reliability testing, and produced within a manufacturing framework built since 1991, this component is positioned within SWT’s broader Ultrasonic Atomization Series to serve humidification, agricultural, and animal husbandry applications requiring multi-head, high-output nebulization performance.