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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryBusiness & Technical ServicesTechnical Consulting & EngineeringIllnauCorroprot AG
Corroprot AG Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Corroprot AG encompasses the planning, implementation and maintenance of plants and systems in the following areas: * Tank facilities (heating oil, diesel, gasoline and liquefied gas tank facilities) * Pipeline construction * Cathodic corrosion protection * Leak protection systems * Service station construction. The company also offers services such as gas checks, tank cleaning and renovation, as well as the sale of products such as leak protection/leak warning devices and other accessories for the above-mentioned plants and systems.

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Products & services

Industry:Technical Consulting & Engineering
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Corroprot AG

Specialized Construction Activities
Specialized Construction Installations
✓ Offered8
Cathodic corrosion protection
Cathodic corrosion protection systems for buried tanks, gas and water pipelines, and other assets; design, construction, inspection, remote monitoring and rectifiers.
Tank installations and tank refurbishments
Planning, delivery and installation of complete filling stations and tank systems for heating oil, petrol, diesel or propane, plus refurbishment of steel and concrete tank installations.
Heat pump installation
End-to-end heat pump projects for heating replacement from oil to heat pump, including consultation, permit application, removal of the old system and turnkey installation.
Leak protection systems and leak alarm devices
Tank liners, linings, internal coatings and leak alarm devices for 24-hour monitoring of tank installations, including consultation and technical solution selection.
Pipeline construction
Planning, supply and installation of safe pipeline systems for fuels, including code-compliant execution, pressure testing and documentation.
Liquefied gas systems
Design, installation and maintenance of liquefied gas systems for propane storage, including gas lines, safety equipment and servicing of propane tanks.
Flood protection and firewater retention
Mobile, fixed, plug-in and stackable flood barriers and firewater retention systems, individually planned, installed and supported with 24-hour on-call service.
Hygienic impact protection and crash protection
Stainless steel safety barriers, bollards and wall protection in sanitary material or stainless steel for food processing, cleanrooms, retail, logistics and industry.
Trust & reputation

ranQ Trust Score of Corroprot AG: 4.3 out of 5.0

Trust Score4.3/ 5.0

Very high

x

Data basis 96% · As of October 2026

Corroprot AG scores 74.1 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.71.024%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.70.510%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.88.08%
Corroprot AG scores 89.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.70.07%
Corroprot AG scores 83.3 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).83.322%
Corroprot AG scores 48.6 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.48.64%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

Corroprot AG reaches a ranQ Trust Score of 4.3 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.5 out of 5 stars from 15 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.5
of 5

Aggregated from 15 reviews across all connected sources

Sources
GGoogle4.515
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

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Location

Kempttalstrasse 111
8308 Illnau
Opening hours
Mon
07:30 - 17:00
Tue
07:30 - 17:00
Wed
07:30 - 17:00
Thu
07:30 - 17:00
Fri
07:30 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-105.976.529
Founded
1969 · 57 years
Last commercial register change
June 9, 2026
Employees
11 to 20
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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