SG

What SG does

SG-Qualitätssicherung GmbH (SG-Q) is a privately held German non-destructive testing (NDT / Zerstörungsfreie Werkstoffprüfung) services company founded in 1985 in Bochum and now headquartered in Castrop-Rauxel, with a second regional site in Müglitztal near Dresden. The company delivers an accredited suite of NDT procedures — radiographic testing (RT) using X-ray tubes up to 300 keV and Se-75/Ir-192 sources, ultrasonic testing (UT), magnetic particle testing (MT), dye penetrant testing (PT), visual inspection (VT), leak testing (LT), mobile hardness testing (HT), and construction/welding supervision — together with a more recent X-ray film digitization service. Approximately fifty certified material testers (qualified per ISO 9712, DGRL, and SCC**) deliver work both on customer sites (mobile) and in-house at two radiation protection rooms handling components up to 4 tonnes.

Name

SG

Legal name

SG-Qualitätssicherung GmbH

Website

https://www.sg-q.de

Company type

Private

Founded year

1985

Operating status

Operating

Headcount range

51–100 employees

Short description

SG-Qualitätssicherung GmbH is a German-accredited non-destructive testing services firm delivering radiographic, ultrasonic, magnetic particle, dye penetrant, visual, leak, hardness, and welding-supervision inspections — plus film digitization — to nuclear, energy, chemical, and industrial clients in Germany and Switzerland, with ~50 certified testers.

Ownership category

akta.pro rank

Product category

Non-Destructive Testing Services

NAICS

Testing Laboratories and Services (541380), Testing Laboratories and Services (54138)

SIC

Services-Testing Laboratories (8734), X-Ray Apparatus & Tubes & Related Irradiation Apparatus (3844)

akta.pro primary industry

Non-Destructive Testing (NDT) & Inspection Services (IMAIACAI)

akta.pro secondary industries

Industrial Radiography & NDT Services (Gamma radiography, source handling, field inspection) (EUAKAIAF), Nuclear Materials Testing, Assay & Characterization Services (NDA/NDE, radiochemistry, materials analysis) (EUAKAIAL), Non-Destructive Testing (NDT) & Advanced Inspection (Phased Array, TOFD, Guided Wave) (EUAEAKAF), Welding Inspection & QA/QC (NDT, PWHT, Weld Procedure/Qualification) (EUAEAHAD), Third-Party Certification, Code Compliance & Regulatory Inspection (ASME/API/ISO) (EUAEAHAN)

Keywords

• Non-destructive testing services
• Radiographic testing services
• Ultrasonic inspection services
• Material quality assurance
• Weld inspection services

Headquarters

HQ city

Castrop-rauxel

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Infrastructure, Technology or R&D, Operations, Marketing or Sales, Others

Revenue model

1. Non-destructive Testing (NDT) Services: SG-Q generates revenue through professional services fees for performing accredited and non-accredited non-destructive testing procedures on customer materials and components. Services are delivered on-site at customer facilities and in the company's own premises. The company also earns revenue from X-ray film digitization services provided to industrial clients.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels3 records

Core offering

SG-Qualitätssicherung GmbH (SG-Q) is an accredited testing institute providing non-destructive testing (NDT) / Zerstörungsfreie Werkstoffprüfung (ZfP) services to industrial clients in nuclear power, energy, chemical, and manufacturing sectors. The company delivers a full suite of accredited and non-accredited NDT procedures—including radiographic, ultrasonic, magnetic particle, dye penetrant, visual, leak, hardness, and film digitization testing—either in-house at its two modern radiation protection rooms in Castrop-Rauxel or via mobile on-site service at customer locations across Germany and Switzerland.

Product overview

SG-Qualitätssicherung GmbH operates as an accredited testing institute offering non-destructive testing (NDT) services. The portfolio consists of nine distinct testing services organized into accredited procedures (Durchstrahlungsprüfung/RT, Ultraschallprüfung/UT, Magnetpulverprüfung/MT, Farbeindringprüfung/PT, Visuelle Kontrolle/VT) and non-accredited services (Filmdigitalisierung, Mobile Härteprüfung, Dichtheitsprüfung, Bau- & Schweißüberwachung). Additional offerings include Lichtmastenprüfung for street lighting pole stability testing. Services are delivered both in-house at their Castrop-Rauxel facility (with two modern radiation protection rooms) and mobile on-site at customer locations. The company serves approximately fifty certified material testers qualified per ISO 9712, DGRL, and SCC** standards.

Differentiator

Problem solved

Functional benefit

Products and services

• Radiographic Testing (Durchstrahlungsprüfung / RT) Radiographic testing using X-ray and gamma radiation to detect internal defects in components. Capable of penetrating up to 80mm steel using sources including X-ray tubes up to 300keV, Selenium-75, and Iridium-192. Available both in dedicated radiation protection rooms and mobile on-site at customer facilities. Accredited under DIN EN ISO/IEC 17025:2018 and intended for industrial and nuclear clients.
• Ultrasonic Testing (Ultraschallprüfung / UT) Ultrasonic testing for inspecting sound-conducting components through their entire cross-section. Detects defects via sound reflections, commonly used for wall thickness measurement, casting and weld inspection, and quality assurance in pipe manufacturing. Delivered for industrial manufacturers and energy clients.
• Magnetic Particle Testing (Magnetpulverprüfung / MT) Magnetic particle testing for detecting surface and near-surface defects in magnetizable workpieces. Makes disturbance fields in the magnetic field caused by imperfections visible, available both mobile on-site and at fixed testing stations at the Castrop-Rauxel facility.
• Dye Penetrant Testing (Farbeindringprüfung / PT) Dye penetrant testing for detecting surface-breaking defects in metallic and non-metallic workpieces. Uses colored and fluorescent penetrant liquids that penetrate fine cracks and defects via capillary effect.
• Visual Inspection (Visuelle Kontrolle / VT) Visual testing using trained and certified inspectors to identify manufacturing and processing defects based on visible irregularities. Employs auxiliary tools such as endoscopes for detailed inspection of critical areas with reproducible documentation.
• Leak Testing (Dichtheitsprüfung / LT) Leak testing to detect and localize pressure losses and leaks in containers or piping systems. Includes bubble leak test method where leaks are made visible through bubble formation at testing points.
• Mobile Hardness Testing (Mobile Härteprüfung / HT) Mobile hardness testing for determining hardness values on stationary or large components. Typical applications include shafts, bearings, and hardness profiles on welds including heat-affected zones.
• X-ray Film Digitization (Filmdigitalisierung / RT-Digitalisierung) X-ray film digitization service using industrial-grade film scanners, converting analog radiographic films to digital format per DIN EN ISO 14096-2 (classes DS, DB, DA). Uses DICONDE format (ASTM E2339) for lossless digital archiving.
• Construction and Welding Supervision / Expert Opinions (Bau- & Schweißüberwachung / Gutachten) Construction and weld monitoring services including creation of inspection plans, construction-related testing, supervision of inspection work, technical acceptance inspections, and expert opinions in relevant testing procedures.
• Street Lighting Mast Stability Testing (Lichtmastenprüfung) Nationwide structural stability inspection of street lighting poles for German municipalities and public lighting operators. Includes project organization, measurement execution, and documentation of measurement data (Standsicherheitsprüfung).

Quantifiable outcome

• Radiographic testing capable of penetrating up to 80mm steel using X-ray tubes up to 300keV, Selen-75, and Iridium-192 sources

Named customers9 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature9 records

Partnerships

Four partnerships are on record, tiered minor and core.

• ZWP Anlagenrevision GmbHminorStrategic or Co-development PartnerService partner based in Beckingen, Germany (Südstraße 1, 66701 Beckingen). The partnership enhances SG-Q's service flexibility and extends its service capabilities to clients.
• VECTOR Technische Unternehmensberatung GmbHminorStrategic or Co-development PartnerTechnical consulting firm with offices in Hattingen (Ruhrhang 3, 45525 Hattingen) and Munich (Westendstraße 185, 80686 München), providing technical consulting expertise.
• DGZfP (Deutsche Gesellschaft für Zerstörungsfreie Prüfung)coreStrategic or Co-development PartnerSG-Q is a member of DGZfP (since 1987) and participates in technical committees and specialist groups (Fachausschüsse). Active involvement in material tester training at major German training institutions.
• F-GZP (Fachgesellschaft akkreditierter ZfP-Prüfstellen in der DGZfP)coreStrategic or Co-development PartnerSG-Q has been a member of GZP/F-GZP since 1987. Membership in this association of accredited NDT testing institutes provides access to industry standards development, best practices, and professional network.

Scale indicators4 records

Recent moves10 records

Expansion highlights5 records

Market position

Strengths4 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/SGQGmbH

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries1 record

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 SG