March 2021


Sealing of
formwork tie points

Dear customers and partners,


The requirements for the sealing of formwork tie points are manifold. In addition to sealing against pressurised water and the inert gas radon, which occurs naturally in the ground, there are often requirements for sound and fire protection, especially in stairwells.


With our STOPPER SCREW range we offer you a user friendly solution with permanent safety for all common formwork tie point dimensions and geometries.

STOPPER SCREW covered und in

Screwed inner seals for formwork tie points –
Maximum safety with excellent visual appearance.

Formwork tie points


The function and safety of the system is proven by usability certificates from practical test set-ups by renowned testing institutes.

Fire test

Fire test

Fire test EI 240 room closure and thermal insulation acc.
to DIN EN 13501-2: 2019-05

Water pressure test

Water pressure test

Impermeable to pressurised water up to 5 bar
(50 m water column)



Effective protection against Radon

Acoustic test

Acoustic test

A component with a tie point sealed with STOPPER SCREW has the identical standard sound level difference as a monolithic component.

E-Mail Mastertec

Contact us

Click here to request test certficates and further information. Our sales team will be happy to assist you with your questions.

Visual appearance

Regardless of the design of the tie point:
– fibre cement or plastic
– flush with formwork, with cones or lips
– anchor holes of conical anchor systems
with the “in“ or “covered“ pressure plate type you will achieve the optimum sealing design for your building object.



StopperScrew with lip

Flush seal for distance tubes with lip.



StopperScrew covered with lip

Sealing of distance tube with lip.

StopperScrew with cone

Flush seal for distance tubes with cone.

StopperScrew covered with cone

Sealing of distance tube with cone.

Prospekt Schalungsspannstellen

Download brochure

Click here to download our brochure
“Waterproofing of formwork tie points“

If you need printed copies of the brochure, please contact us.

Take advantage of the extensive range of information available at


In addition to product information, you will find a wide range of technical data, installation instructions, installation videos, animations and technical drawings.


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We also present our products on Germany's leading information platform In addition to product information, you will also find the appropriate tender specifications.


Im Maintal 13  |  Gewerbegebiet Unterhaid  |  96173 Oberhaid


T: +49 (0) 9503 / 5047-0  |  F: +49 (0) 9503 / 5047-20  |

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