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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint747,212 companies indexed · Last updated: today
DirectoryIndustryPlastics manufacturerMerenschwandLonstroff AG
Lonstroff AG Logo
Verified· 4 sourcesTrust Score
Summary

About the company

Lonstroff AG develops and manufactures elastomer components for pharmaceutical primary packaging, medical devices and industrial applications. Its products include stoppers, seals and laminates made from rubber and plastics, and the company also provides custom material and product development.

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Products & services

Industry:Plastics manufacturer
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Lonstroff AG

✓ Offered6
Primary packaging materials
Stoppers, discs, piston stoppers, sealing discs, Needle Shields and Tip-Caps for pharmaceutical primary packaging, manufactured according to cGMP rules and for medicines with long contact times.
Medical devices
Components for medical devices and application aids, including piston stoppers, seals, cartridge discs, tube connectors, pipette fittings and mini needle protection caps.
Elastomer parts for industry
Elastomer parts made of rubber materials and plastics as moulded parts or films for closing, sealing, damping, insulating and protecting, including laminates and seals.
Compounding
Mixing tested raw materials according to formulation, with fixed predefined weighings and mixing processes for elastomer components.
Shaping
Shaping of the compounds in compression moulds, injection moulding machines and calendering and Rotecure systems, followed by vulcanisation.
Finishing
Punching out vulcanised mouldings, as well as washing, laboratory testing, packaging and release of pharmaceutical primary packaging materials and medical technology products in cleanroom class 5.
Trust & reputation

ranQ Trust Score of Lonstroff AG: 4.0 out of 5.0

Trust Score4.0/ 5.0

High

x

Data basis 100% · As of November 2026

Lonstroff AG scores 52.2 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.65.024%
  • 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.35.310%
  • 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.35.08%
Lonstroff AG scores 95.8 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.96.07%
Lonstroff AG scores 86.7 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).86.722%
Lonstroff AG scores 45.7 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 35.51.44%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.40.04%
Qualifications+0.00

Lonstroff AG reaches a ranQ Trust Score of 4.0 out of 5.0 — rated «High». The rating draws, among other things, on 4.3 out of 5 stars from 3 customer reviews. As of November 2026.

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

Reviews

Aggregated rating

Aggregated rating
4.3
of 5

Aggregated from 3 reviews across all connected sources

Sources
GGoogle4.33
★TrustpilotSoon
PProvenExpertSoon

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

Press

Media

February 13, 2020Media
Arbeitskollege nach Unfall an Stanzmaschine entlassen
blick.ch
January 23, 2020Media
Strafverfahren gegen betroffenen Mitarbeiter eröffnet
blick.ch
January 20, 2020Media
Stanzmaschine zerquetscht Agneza T. (29) die Finger
blick.ch
September 1, 2012Media
Das Lonstroff-Areal wird von der IBA neu genutzt werden
aargauerzeitung.ch

Knowledge

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Location

Industrie Nord 1
5634 Merenschwand
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-113.640.735
Founded
2007 · 19 years
Last commercial register change
September 30, 2025
Employees
101 to 500
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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