Wilhelm Siefer

What Wilhelm Siefer does

Wilhelm Siefer GmbH & Co. KG is a privately held German manufacturer of industrial wet mechanical processing equipment, founded in 1978 and headquartered in Velbert, North Rhine-Westphalia. The company designs, develops, and produces its machines entirely in-house at its German facility, maintaining a high level of vertical integration. It sells capital equipment under the SIEFER TRIGONAL® brand and has cumulatively delivered more than 6,466 machines since inception, with 6,000+ processing plants worldwide operating its equipment and 91% of all machines ever built still in service.

The core product line is the Trigonal® rotor-stator machine family — comprising the SM 180, SM 290, and SM-D3 models (power ratings from 7.5 kW to 250 kW) — each available with optional heating/cooling jackets (HK) or electrical heating (HE) modules. These machines perform size reduction, mixing, homogenizing, emulsifying, and dispersing at speeds up to 5,400 RPM using up to four coaxially arranged rigid and movable rings. A proprietary axial stepless gap adjustment (0.1–3 mm) and a 2026-launched electronic HMI-controlled variant form a key technical differentiator. Modular add-ons such as the Binary Inlet system and various gap adjustment mechanisms support both new equipment sales and retrofit modernization of the installed base. Application verticals include bitumen and road construction, chemicals, paints and coatings, food, pet food, paper, agrochemicals, biotechnology/renewable resources, and recycling.

Siefer operates a direct enterprise sales model with dedicated sales engineers (Jan-Derek Schlué, Thomas Jung) under CEO Michael Supe, supplemented by trade show presence (ACHEMA 2024) and website-driven inbound. Revenue is generated through one-time capital equipment sales plus retrofit accessory revenue, with project-based pricing denominated in EUR. The customer base spans ten process industry verticals, with no individually named logos disclosed; the bitumen segment alone accounts for 2,500+ installed machines. No external investors, parent companies, or funding rounds are identified.

Name

Wilhelm Siefer

Legal name

Wilhelm Siefer GmbH & Co. KG

Website

https://siefer-trigonal.de

Company type

Private

Founded year

1978

Operating status

Operating

Headcount range

11–50 employees

Short description

Wilhelm Siefer GmbH & Co. KG is a privately held German manufacturer founded in 1978 that designs, produces, and sells SIEFER TRIGONAL® rotor-stator mixing and size-reduction machines for industrial wet mechanical processing across bitumen, chemicals, food, paints, and recycling customers worldwide.

Ownership category

akta.pro rank

Headquarters

HQ city

Velbert

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Industrial Machinery Sales: Sale of Trigonal® mixing and size-reduction machines (capital equipment). Machines are sold with various configurations including heating/cooling jackets, different power ratings, and customization options. Revenue is one-time capital expenditure from industrial buyers.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Wilhelm Siefer GmbH & Co. KG manufactures and sells SIEFER TRIGONAL® rotor-stator machines that perform wet mechanical size reduction, mixing, homogenizing, emulsifying, dispersing, deagglomerating, and dissolving of liquid mixtures and solids-in-liquids across viscosity ranges. The product family comprises three base machine platforms (SM 180, SM 290, SM-D3) with heating/cooling jacket (HK) and electrical heating (HE) variants, sold as configured capital equipment to industrial processors in bitumen, chemicals, food, paints and coatings, paper, agrochemicals, biotechnology, and recycling sectors.

Product overview

Wilhelm Siefer GmbH & Co. KG offers the SIEFER TRIGONAL® machine series - industrial rotor-stator systems for wet mechanical size reduction and mixing. The product line consists of three core machine models (SM 180, SM 290, and SM-D3), each available in standard and heating/cooling jacket (HK) variants, with power ratings ranging from 7.5-45 kW (SM 180), 15-110 kW (SM 290), and 90-250 kW (SM-D3). Additional variants include electrical heating (HE) options for fossil-fuel-free operation. Key accessories include the Binary Inlet system for combining separate liquid streams, and three types of gap adjustment mechanisms (electronic and two analogue variants). The machines use a system of up to four coaxially arranged rotor-stator rings reaching speeds up to 5,400 RPM, and are applied across industries including bitumen, chemicals, food, pharmaceuticals, and recycling.

Differentiator

Problem solved

Functional benefit

Brands

• SM 180 / SM 180/HK: Smallest Trigonal machine model with up to 45kW drive power, processing particles up to 15mm diameter.
• SM 290 / SM 290/HK
• SM-D3 / SM-D3/HK

Products and services

• SM 180 The smallest Trigonal® rotor-stator machine platform for wet mechanical size reduction, mixing, homogenizing, emulsifying, and dispersing of low-to-high viscosity materials. Delivers up to 45 kW drive power, maximum 5,400 RPM, throughput of 4–28 m³/h, and processes particles up to 15 mm diameter; weighs 190 kg. Targeted at industrial processors across bitumen, chemicals, paints and coatings, food, and recycling.
• SM 180/HK SM 180 variant with integrated heating/cooling jacket for temperature-controlled wet mechanical processing. Weighs 235 kg with dimensions of 965 x 420 x 420 mm. Targeted at industrial processors requiring precise thermal management during mixing and size reduction.
• SM 290 Mid-range Trigonal® rotor-stator machine with 15–110 kW drive power, 1,500–3,600 RPM speed range, throughput of 6–120 m³/h, and particle handling up to 30 mm diameter. Weighs 265 kg. Targeted at mid-scale industrial processors requiring higher throughput and broader process range than the SM 180.
• SM 290/HK SM 290 variant with integrated heating/cooling jacket for temperature-controlled wet mechanical processing. Weighs 275 kg with dimensions of 1,000 x 580 x 580 mm including jacket. Targeted at industrial processors of viscous or temperature-sensitive media.
• SM-D3 The most powerful Trigonal® rotor-stator machine with up to 250 kW drive power, 1,500–2,300 RPM, 8 bar discharge pressure, throughput of 20–250 m³/h, and particle handling up to 50 mm diameter. Weighs 960 kg. Targeted at high-capacity industrial processors including bitumen modification at scale.
• SM-D3/HK SM-D3 variant with integrated heating/cooling jacket for temperature-controlled wet mechanical processing at high capacities. Weighs 980 kg with dimensions of 1,450 x 900 x 835 mm. Targeted at heavy industrial applications such as polymer-modified bitumen processing.
• Electrical Heating System (HE) Electric heating option for SIEFER TRIGONAL® machines (SM 180/HE, SM 290/HE, SM-D3/HE) that reaches 200°C–250°C for processing viscous media including polymers, fats, and bitumen. Serves as an alternative to fossil-fuel-based heating with quick installation and retrofit capability for existing machines. Targeted at industrial processors seeking to eliminate fossil fuel dependency.
• Binary Inlet (Zweistoffzulauf) A component positioned upstream of the wet grinder that combines separate liquid streams only at the mixing point, preventing preliminary reactions, deposits, or curing of incompatible materials. Applications include bitumen/water phase, resins/hardeners, polyurethane foam, and two-component adhesives. Sold as an add-on module to SIEFER TRIGONAL® machines.
• Electronic Gap Adjustment Fully automated electronic gap adjustment with touchscreen HMI control, automatic zero-point setting, and optional process control system integration via signal output. Available for new SIEFER TRIGONAL® machines and as a retrofit kit for the existing installed base.
• Analogue Gap Adjustment with Set Collar Axial stepless gap adjustment mechanism for SIEFER TRIGONAL® machines using a set collar and scale wheel (vernier), enabling distance between rotor and stator to be adjusted between 0.1 mm and 3 mm without opening the machine. Sold as a configuration option on new machines.
• Analogue Gap Adjustment with Position Indicator Axial stepless gap adjustment mechanism for SIEFER TRIGONAL® machines using a position indicator rather than a scale wheel, enabling distance between rotor and stator to be adjusted between 0.1 mm and 3 mm without opening the machine. Sold as a configuration option on new machines.

Quantifiable outcome

• 91% of all machines produced since 1978 are still operational
• +4 more outcomes

Named customers10 records

Segments9 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators6 records

Recent moves5 records

Expansion highlights4 records

Broad incumbents

• GEA Group: GEA is a large German-engineering incumbent supplying process technology across food, dairy, chemicals, and pharma, including homogenizers and mixers. It serves overlapping customers with a broader portfolio but is not specialized in wet rotor-stator mills to the same degree as Siefer.
• Hosokawa Micron: Hosokawa Micron provides powder and particle processing equipment, including wet and dry milling, mixing, and classification systems. It overlaps with Siefer in chemical, food, and mineral processing but at a much broader, multi-technology scale.
• SPX Flow Technology: SPX Flow offers mixers, homogenizers, and process equipment across food, dairy, beverage, and industrial markets. It competes with Siefer in wet-processing and emulsification but as part of a much wider process-equipment portfolio.

Direct peers

• Ystral: Ystral is a German manufacturer of high-shear mixers, inline dispersers, and powder-induction machines used in chemicals, food, and coatings. Its inline rotor-stator mixers compete directly with Siefer's Trigonal machines for similar wet-processing use cases.
• Silverson Machines: Silverson is a UK-based manufacturer of high-shear rotor-stator mixers and homogenizers for pharmaceuticals, cosmetics, food, and chemicals. It is a well-established direct competitor in wet mechanical mixing and size reduction.
• NETZSCH Feinmahltechnik: NETZSCH is a German specialist in wet and dry grinding, dispersion, and homogenization equipment, including rotor-stator and bead-mill systems. It directly overlaps with Siefer's wet mechanical size-reduction and mixing portfolio across chemicals, paints, and bitumen-adjacent applications.
• Kinematica: Kinematica is a Switzerland-based maker of high-shear batch and inline mixers, dispersers, and homogenizers for pharma, biotech, food, and chemicals. It is a comparable niche peer in wet mechanical processing equipment.
• Probst & Class: Probst & Class is a German manufacturer of rotor-stator systems and grinding/dispersing machines for chemicals, paints, and inks. It is a smaller direct competitor with similar wet-process technology and customer overlap.
• FrymaKoruma (Romaco): FrymaKoruma, part of Romaco, supplies wet-milling, homogenizing, and emulsifying equipment for cosmetics, food, pharmaceuticals, and chemicals. It overlaps directly with Siefer's wet-process technology and target verticals.
• IKA-Werke: IKA-Werke is a German manufacturer of laboratory, process, and industrial mixing, homogenizing, and dispersing equipment (rotor-stator and magnetic-stirrer systems). It directly competes with Siefer in industrial wet-milling and mixing, sharing a German engineering base and similar customer segments in chemicals, food, and cosmetics.

Market position

Strengths1 record

Weaknesses5 records

Competitive moat4 records

Key risks7 records

Key highlights7 records

Customer concentration

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Wilhelm Siefer