DOYMA Curaflex® pipe gasket inserts overview

Interflow supplies a comprehensive range of DOYMA Pipe Gasket inserts which can be used as part of a complete pipe sealing system. Often referred to as flange gaskets, their use is to prevent the leakage of fluid between the two components that are static or don’t have relative motion despite ongoing compressibility. DOYMA pipe gasket materials are usually a mixture of steel, plastic and rubber.

DOYMA manufacture a range that includes both pipe gasket sealing against pressing water and without. Gasketing pipe systems are essential to ensure that no matter where the pipe enters the building, a perfect standard of air tightness and waterproofing is achieved.

Sealing against pressing water

Product Membranes/bituminous coating
Without tanking With tanking
Curaflex Nova® Multi
Curaflex Nova® Senso
Curaflex Nova® Uno
Curaflex® C
Curaflex® Quick In C
Curaflex® C 40
Curaflex® C/M
Curaflex® C/M/T
Curaflex® C/0
Curaflex® MS/C
Curaflex® C/S
Curaflex® F
Curaflex® C/2/SD/6
Curaflex® F/2/SD/6

Sealing against non-pressing water

Product Membranes/bituminous coating
Without tanking With tanking
Curaflex Nova® Multi
Curaflex Nova® Senso
Curaflex Nova® Uno
Curaflex® A
Curaflex® Quick In A
Curaflex® A 40
Curaflex® A/M
Curaflex® A/M/T
Curaflex® A/0
Curaflex® MS/A
Curaflex® A/S
Curaflex® B
Curaflex® C/2/SD/5
Curaflex® F/2/SD/5

Protection against superfine particles

Product Installation on the clean room side Installation on the outside
Curaflex® 59.100
Curaflex® 59.200

Protection against dust and splash

Product Protection against dust and splash through open annuli or bores
Curaflex® RRV

Pressing / non-pressing water

Pressing water – water which exerts hydrostatic pressure (even if limited in time, e.g. accumulating seepage water) on the structural element with the feedthrough. Groundwater and floodwater are typical water types. Non-pressing water – water which does not exert any hydrostatic pressure on the structural element with the feedthrough. Capillary water is a typical water type.

Without tanking membranes / bituminous coating (white tank),
with tanking membranes / bituminous coating (black tank)

Non-waterproof structures must be protected with a sealing coat against penetrating water. This sealing coat can be in the form of sheeting, trowelable or liquid-applicable masses and therefore results in a skin-type seal. Since bitumen plays a major role in terms of materials, these forms of seals are often known as a “black tank”. Waterproof or non-water-permeable structures do not require additional skin sealing. This type of structure includes those using impermeable reinforced concrete. This type of structural waterproofing is also known as a “white tank”.

Curaflex® pipe gasket inserts with DPS

Sealing with a profile

Pipe Gasket InsertsDPS system of a Curaflex® C gasket insert


DPS system – cross-section

The unique Double Profile System (DPS) generates a differential contact pressure by means of profiled sealing frames and caters for a larger sealing surface.

The unique DOYMA grip is a special elastomer with high adhesive force on the media pipe. Together, this caters for excellent and permanent sealing of the DOYMA pipe gasket inserts.


DOYMA DPS distributes the pressure more intelligently: In comparison to conventional pipe gasket inserts, the contact pressure increases towards the core bore (or pipe sleeve). At the same time, the contact pressure on the media pipe is reduced by up to 30 %.

Installation of Curaflex® pipe gasket inserts

Installation example pipe gasket insert Curaflex® C/2/SD/6

Maximum torque

bolt Ø wrench width Maximum torque
M 5 8 3 Nm
M 6 10 8 Nm
M 8 13 12 Nm
M 10 17 25 Nm
M 12 19 30 Nm

Curaflex® C/2/SD/6 gasket insert installed in core bore.

Curaflex® C/2/SD/6 gasket insert installed in core bore.

Please note:

  1. The wall must be clean, flat and dry in the installation vicinity.
  2. There may be no grooves, cracks and breakouts on the wall surface in the installation vicinity.
  3. Masonry must always be fitted with a pipe sleeve.
  4. The seals and pipe services must be clean and free of damage.
  5. Curaflex® gasket inserts are maintenance-free. Re-tightening the bolts is not necessary if installed correctly.
  6. Does the gasket insert fit? Compare service line and pipe sleeve/core drilling diameter with the information on the gasket insert.
  7. The nut side of the gasket insert should be facing the dry side of the wall.
  8. Pipe gasket inserts are not fixed points or supports, but are exclusively intended for elastic sealing of service lines.
  9. Slight axial movements of the service lines are permissible.
  10. We recommend sealing the drillhole walls with Curaflex® Aquagard (primer 1710/1711 and special paint 1715/1716).

DOYMA products are continuously being further developed, technical changes will take place without previous notification.

Extensive installation instructions are provided with the product.

Curaflex® C/2/SD/6 is a pipe gasket insert with one fixed and one loose flange. The system seals off pipes and cables against pressing water, and is suitable for buildings with sealing sheets or bituminous coating


Position the gasket insert in the cutout.


Mark the rawlplug holes, drill holes and insert the rawlplugs.


Tighten the countersunk screws.


Compensation of transition between fixed flange and wall using mortar.


If necessary, fix the sealing sheet with edgings and loose flange halves.


Tension the loose flange with the torque wrench. Observe torques in accordance with DIN 18195.


Install the service line and tension the gasket insert with the torque wrench (note Fig. 8).


Tighten the bolts diametrically opposing. Note maximum torque.