ST Equipment & Technology
ST Equipment & Technology manufactures dry triboelectrostatic separators that separate fine particles without water or chemicals, serving fly ash, industrial minerals, animal feed, and human food customers with custom processing plants and ongoing technical support.
- Company typePrivate
- Founded1989
- HeadquartersNeedham, United States
- Headcount11–50
- GTM typeB2B
- OfferingHardware or Manufacturing
What ST Equipment & Technology does
ST Equipment & Technology (STET) is a Needham, Massachusetts-based manufacturer of dry triboelectrostatic separation equipment, founded in 1989 to commercialize an invention by an MIT scientist. The company's core product is a parallel-plate electrostatic separator with horizontally-oriented electrodes and a high-speed open-mesh conveyor belt that simultaneously tribo-charges and conveys particles, enabling continuous separation of fine and ultra-fine powders (down to 1-2 microns) without water, chemicals, or thermal pre-treatment. Processing capacities range from 15 tons per hour for food and feed applications to 40-45 tons per hour for fly ash and minerals, with energy consumption of 1-4 kWhr per ton of feed.
STET serves four primary verticals: fly ash beneficiation (its largest segment, with 12 power station installations processing ash for ASTM C618-compliant ProAsh concrete products), industrial minerals (calcium carbonate, limestone, barite, talc, feldspar, iron ore, bauxite, potash, phosphate), animal feed (protein enrichment of sunflower, canola, and DDGS), and human food (plant-based protein concentration). The technology is protected by 19 patents across major jurisdictions, and the company's processing history spans more than 25 million tons of fly ash and 100+ machine years of operation.
The business model is enterprise-focused direct sales, delivering custom-engineered processing plants end-to-end, from needs assessment and pilot testing through plant design, permitting, construction, commissioning, and ongoing maintenance and technical support. Revenue is generated through capital equipment sales, engineering and plant design services, and recurring technical support and maintenance contracts, supplemented by sale of the ProAsh fly ash brand produced via customer operations. STET operates direct regional business development coverage in North America, Europe, and Asia. The company is privately held, with Titan Cement as its strategic parent.
ST Equipment & Technology firmographics
Firmographics- Name
- ST Equipment & Technology
- Legal name
- ST Equipment & Technology LLC
- Website
- https://steqtech.com
- Company type
- Private
- Founded year
- 1989
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- ST Equipment & Technology manufactures dry triboelectrostatic separators that separate fine particles without water or chemicals, serving fly ash, industrial minerals, animal feed, and human food customers with custom processing plants and ongoing technical support.
- Ownership category
- akta.pro rank
ST Equipment & Technology industry classification
Industry- Product category
- Industrial Separation Equipment
- NAICS
- Industrial and Commercial Fan and Blower and Air Purification Equipment Manufacturing (333413)
- SIC
- Industrial & Commercial Fans & Blowers & Air Purifing Equip (3564)
- akta.pro primary industry
- Separation & Filtration Equipment (Filters, Centrifuges, Membranes) (IMAHAEAB)
- akta.pro secondary industry
- Dust Collection & Air Filtration Equipment (Industrial) (IMAHALAF)
Keywords
Where ST Equipment & Technology is headquartered
LocationHeadquarters
- HQ city
- Needham
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
ST Equipment & Technology business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Technology or R&D, Operations, Personnel, Supply Chain, Marketing or Sales, Infrastructure
Revenue model
- Equipment Sales: Sale of proprietary STET electrostatic separator machines, available in various sizes (42-inch electrode width units processing up to 40-45 tons per hour for high-density materials). Equipment sales are complemented by engineering design services.
- Engineering and Plant Design Services: End-to-end service model including needs assessment, sample testing, pilot trials, plant design, permitting, construction management, and optimization. These services support the equipment sales and represent ongoing project revenue.
- Technical Support and Maintenance: Ongoing technical support, maintenance services, scale-up support, and warehousing services for installed processing plants. Represents recurring service revenue from existing operations.
- Processed Product Sales (ProAsh): Through customer operations, STET technology enables production of saleable fly ash products (ProAsh brand) for concrete and cement applications, creating value from waste streams.
Go-to-market motion1 record
Distribution channels1 record
Marketing channels5 records
ST Equipment & Technology product offering
Product offeringCore offering
ST Equipment & Technology designs, manufactures, and supports proprietary dry triboelectrostatic separation equipment (the STET Separator) used to beneficiate fine particle materials across four application areas: fly ash, industrial minerals, animal feed, and human food. The company sells the separator hardware together with end-to-end engineering services covering feasibility testing, pilot plant trials, plant design, permitting, construction, commissioning, and ongoing maintenance and scale-up support. Branded processed fly ash products (ProAsh) are also offered as a downstream output for customers in the concrete and cement market.
Product overview
ST Equipment & Technology (STET) offers a proprietary dry triboelectrostatic separation technology centered around the STET Electrostatic Separator. The core separator machine uses horizontal parallel-plate electrodes and a high-speed open mesh conveyor belt to simultaneously charge and separate particles based on surface electrical properties. This single-step, water-free, chemical-free process handles materials from 600 microns down to 1-2 microns. The product portfolio includes the STET Electrostatic Separator as the core hardware, supplemented by ProAsh branded fly ash products, and application-specific processing services for fly ash, minerals, animal feed, and human food industries. Processing capacities range from 15 tons per hour for food/feed applications to 40-45 tons per hour for fly ash and mineral processing. The company also provides comprehensive end-to-end services including pilot plant trials, plant design/permitting, construction, and ongoing technical support.
Differentiator
Problem solved
Functional benefit
Products and services
- STET Electrostatic Separator Parallel-plate triboelectrostatic separator that separates particles based on surface charge differences acquired through interparticle contact. Features horizontal electrode orientation and a high-speed open-mesh conveyor belt for simultaneous particle charging and conveying, capable of processing materials from approximately 600 microns down to 1-2 microns at capacities up to 40-45 tons per hour for high-density materials and up to 15 tons per hour for food/feed applications.
- ProAsh Fly Ash Products
Quantifiable outcome
- 25 million tons of fly ash processed to date, generating high-quality concrete-grade product
- +6 more outcomes
Companies that use ST Equipment & Technology
Customer profileNamed customers3 records
Segments4 records
Ideal customer profiles4 records
ST Equipment & Technology technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
ST Equipment & Technology partnerships and signals
Strategic signalPartnerships
Three partnerships are on record, tiered core and minor.
- Cardinal PlantcoreCardinal Plant partnered with Separation Technologies (STET) to sell fly ash from coal-fired electricity generation for making concrete products. Cardinal Plant processes fly ash using STET technology and distributes the resulting ProAsh product to concrete producers.
- Atritor LtdminorAtritor Ltd and ST Equipment & Technology LLC exhibited together at UK Quality Ash Association events, representing a collaborative presence in the UK fly ash processing market.
- ImeryscoreST Equipment & Technology LLC signed an agreement with Imerys for mineral processing applications. Imerys is a world leader in mineral-based specialties for industry. The partnership focused on applying STET's dry electrostatic separation technology to Imerys' mineral processing operations.
Scale indicators12 records
Recent moves7 records
Expansion highlights6 records
ST Equipment & Technology competitors and assessment
Company assessmentDirect peers
- Headwaters Resources (Eco Material Technologies): Largest North American marketer of fly ash and coal combustion products, operating fly ash processing and distribution infrastructure. Direct competitor in the fly ash SCM market; both serve power utilities and concrete producers with specification-grade supplementary cementitious materials.
- Charah Solutions (now Eco Material Technologies): US-based fly ash marketer and SCM producer with significant ponded ash and landfill ash processing operations. Directly competes with STET's ProAsh business in the processed fly ash SCM market.
Broad incumbents
- Metso: Global leader in mining and mineral processing equipment, offering separation technologies including flotation, magnetic, and gravity separators. Competes with STET in industrial minerals separation and serves many of the same mining customers, though with a broader portfolio of wet and dry methods.
- FLSmidth: Major supplier of equipment and services to the cement and minerals industries, including separation and material processing equipment. Overlaps with STET in cement-related materials processing and mineral beneficiation.
- Andritz Separation: Global separation technology provider offering centrifuges, filters, and dryers across food, feed, minerals, and environmental applications. Competes in industrial separation equipment markets and serves similar customer segments, particularly in food/feed.
- Hosokawa Micron: Leading manufacturer of powder and particle processing equipment, including classifiers, separators, and air classification systems. Serves overlapping customer segments in fine particle processing for minerals, food, and feed.
- Outotec (now part of Metso): Former major mineral processing equipment supplier (now merged with Metso), historically offering electrostatic separators for mineral applications. Directly competed with STET in dry electrostatic separation of minerals before consolidation.
Emerging players
- BHS Filtration: Manufacturer of industrial filtration and separation equipment including rotary drum filters and candle filters. Competes in solid-liquid separation but with different technology approach; potential competitor in minerals and food/feed segments.
- Russell Finex: Global provider of industrial sieving and separation equipment for powders and liquids, serving food, pharmaceutical, and chemical industries. Overlaps with STET in fine particle separation for food/feed applications.
Others
- Cleveland-Cliffs (ferro-silicon / mineral processing): Major iron ore producer and mineral processing company. STET's iron ore separation technology is relevant to Cleveland-Cliffs' operations and represents a potential customer/supplier relationship in dry mineral processing.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks5 records
Key highlights7 records
Customer concentration
ST Equipment & Technology social profiles
Digital presenceST Equipment & Technology compliance and trust
Trust signalCompliance3 records
ST Equipment & Technology financial estimates
Financial estimateRevenue estimate
Valuation estimate
ST Equipment & Technology leadership team
Management profileNumber of profiles
Profiles19 records
ST Equipment & Technology funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
ST Equipment & Technology M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about ST Equipment & Technology
What does ST Equipment & Technology do?
ST Equipment & Technology designs, manufactures, and supports proprietary dry triboelectrostatic separation equipment (the STET Separator) used to beneficiate fine particle materials across four application areas: fly ash, industrial minerals, animal feed, and human food. The company sells the separator hardware together with end-to-end engineering services covering feasibility testing, pilot plant trials, plant design, permitting, construction, commissioning, and ongoing maintenance and scale-up support. Branded processed fly ash products (ProAsh) are also offered as a downstream output for customers in the concrete and cement market.
Is ST Equipment & Technology a public or private company?
ST Equipment & Technology is a private company. It is classified as corporate owned and is currently operating.
When was ST Equipment & Technology founded?
ST Equipment & Technology was founded in 1989. It employs 11 to 50 people.
Where is ST Equipment & Technology based?
ST Equipment & Technology is headquartered in Needham, United States, in the North America region.
How does ST Equipment & Technology make money?
Four revenue lines are on record. Equipment Sales are the primary driver. The others are engineering and Plant Design Services, technical Support and Maintenance and processed Product Sales (ProAsh).
Who are ST Equipment & Technology's main competitors?
Direct peers on record are Headwaters Resources (Eco Material Technologies) and Charah Solutions (now Eco Material Technologies). Broad incumbents are Metso, FLSmidth, Andritz Separation, Hosokawa Micron and Outotec (now part of Metso). Emerging players are BHS Filtration and Russell Finex. Cleveland-Cliffs (ferro-silicon / mineral processing) is listed as an others.
Does ST Equipment & Technology have an API?
No public API is recorded for ST Equipment & Technology.
What industry is ST Equipment & Technology in?
ST Equipment & Technology's product category is Industrial Separation Equipment. Its primary akta.pro industry code is IMAHAEAB, Separation & Filtration Equipment (Filters, Centrifuges, Membranes), with a secondary code of IMAHALAF, Dust Collection & Air Filtration Equipment (Industrial). Its NAICS code is 333413 and its SIC code is 3564.