This FAQ for sealing and fire protection systems is intended to raise and clarify emerging questions.


The goods are available for collection at Industriestraße 57 - Tor 2.

Monday to Thursday from 7 a.m. to 3 p.m.
Fri from 7 a.m. to 1.30 p.m.

Other times by appointment at 0049 4207/91 66 300

Sealing systems

Basically dependent on the masonry. However, we recommend using it in a casing.

Curaflex® sealing inserts are maintenance-free. If the assembly is correct, it is not necessary to retighten the hexagon nuts.

Depending on the circumstances, the following accessories are available:


A) For single-layer loose, hard or thin (<2 mm) sealing sheeting, EPDM allowances 1775 (2 pieces of EPDM cut, adapted to the selected fixed-loose flange system) are recommended


B) For thick coatings (for example KMB), the accessory Curaflex 1776 (foam rubber spacer rings and a glass silk fabric for incorporation into the KMB) may be recommended, if necessary, an additional punch.

In principle, in the case of core drilling in reinforced concrete, there is a duty to cut reinforcements, but also if the concrete cover is undershot to take measures to prevent the corrosion of the reinforcement. For this reason, but also to correct further defects, the use of Aquagard is recommended.

As a rule, the GGV version is sufficient. However, if the gasket insert comes into contact with acidic or alkaline water, drinking water or aggressive media, to use a different material. We can make binding statements for you when you return the completed resistance checklit GERMAN version. We are pleased to to make you an appropriate offer.

Yes, it is possible to manufacture special versions. Submit the diameter of your lines and the core hole / casing pipe to us in advance. We check the technical feasibility in-house.

No, here we need the exact cable diameter in mm. The articles are always manufactured individually for your application after receipt of the order.

It is possible to order additional holes from the factory, in which the drill core remains in the rubber seal at no extra charge. However, this must be clearly stated in the order. But here too we have to know in advance which cable diameters are to be carried out later.

Our sealing inserts (Curaflex®, Curaflex Nova® or HKD) can be installed in waterproof concrete core holes or wall sleeves, the course of which deviates from the horizontal or vertical (e.g. inclined hole). The prerequisite for this is that the pipe to be sealed runs parallel to the wall of the core drill hole / casing pipe (same angle) and that the sealing systems are properly installed in accordance with our applicable installation instructions.

As far out as possible (water side). For element walls in the area of ​​the in-situ concrete or in the sealing part of the wall (information on this from the manufacturer). If it is not clear, it is recommended to use sealing systems that seal both in-situ and ready-mixed concrete.

In the case of raised houses in timber construction, in which the floor or the lowest ceiling is also made of timber, there is no waterproofing that comes into contact with the ground. So we don't find any sealing according to DIN 18533 or a waterproof concrete floor slab. Due to the elevation, the lower end is not exposed to any groundwater, surface water or soil gases (these can escape freely). Thus, the lower end of the structure only needs to be sealed in the same way as with above-ground wall penetrations. The regulations for the electricity, water and telecommunications sectors require a gas and water-tight introduction for the network / house connection. This can be done with a seal between the jacket / empty pipe and the line and an on-site seal between the jacket / empty pipe and the seal (usually airtight film) of the wooden ceiling. For gas house entry, DVGW G 459-1 requires a fixed point and a DVGW VP 601 tested and approved house entry system. In order to meet the fixed point with this type of construction, a concrete foundation is required in any case (at least 10 cm around the house entry system). When using our Quadro-Secura single or multi-line building entries for buildings without a basement, however, we need a concrete foundation due to the function. This means that the structural design of the products is designed for this and it is not possible to carry out the installation specifications without a concrete foundation.

Axial movement of local and district heating pipes can lead to the following situations with regard to the seal insert: • There is no relative movement between the jacket pipe and the rubber seal of the sealing insert - the rubber flexes with it • Relative movement occurs between the jacket pipe and the rubber seal of the sealing insert - the pipe slips When there is a relative movement between the jacket tube and the rubber seal of the sealing insert, frictional forces arise. Internal tests have shown that these frictional forces can lead to a detachment of the bond between the media line and the insulation / foam. When the rubber is flexed (no relative movement), axial movement of 10 to 20 mm is generally possible due to thermal expansion (slowly) if it is a smooth-walled PE-HD jacket pipe. The axial movement depends on the following boundary conditions: • Type of pipe • Rubber material • Repetition rate of the movement • speed of movement • Length of movement • Structural conditions • Pipeline route In any case, a radial movement must be excluded. Conclusion: Unfortunately, we cannot make a general statement on this. If we are given the concrete conditions, more precise statements are possible.

The sealing systems of the DOYMA ranges Curaflex® and Quadro-Secura® meet the minimum requirements of the building supervisory authority of the sample administrative regulation Technical Building Regulations (MVV TB) according to Annex 4, according to the building material class according to DIN 4102 (B2) and DIN EN 13501-1 (E) and are therefore considered to be normally flammable.

Edge insulation strips serve to separate the screed from solid components (sound decoupling) and enable the screed to expand (protection against cracking). If the edge insulation strip is properly laid (max. 10 mm material thickness), i.e. tightly guided around the frame of the structural component and then covered (at the level of the floor covering) by the anchor plate of the installation part, this is appropriate and professional. The edge insulation strips must be surrounded all around by screed concrete. The requirements of DVGW G459-1 are thus met. The prerequisite for this is the proper installation of the building entry in accordance with our installation instructions. Floating screeds are used to improve thermal and footfall sound insulation, i.e. the above-mentioned sound decoupling and, especially in the case of underfloor heating, the possibility of expansion. This means that the screed slab can move vertically and horizontally. It must not have any direct contact with other components, as otherwise sound or thermal bridges and a constraint arise. If the network operator does not want to be satisfied with our procedure described above, then a corresponding area around the construction kit would have to be poured with concrete and then separated from the wall and the screed slab by means of an edge insulation strip. From our point of view, this is time-consuming and disproportionate.

According to the guidelines and regulations of the German Institute for Building Technology (DIBt), our press seals belong to the construction products according to the sample administrative regulation Technical Building Regulations (MVV TB) Part D. The sample administrative regulation for technical building regulations (MVV TB) Part D is defined as follows: "Part D contains the list of construction products provided according to § 17 Paragraph 3 MBO1, which do not require a proof of usability. This includes construction products for which there are generally recognized rules of technology, but no proof of usability is required, as well as construction products for which there are neither technical building regulations nor There are generally recognized rules of technology and which are of subordinate importance under building regulations. The list is for clarification purposes and does not claim to be complete. " In part D these are under D Ring seals for pipe penetrations and sealing of formwork tensioning points in external components in contact with the ground, to which no fire protection requirements are made. This means that we cannot issue you a proof of usability, proof of conformity, manufacturer's declaration, declaration of conformity or a structural approval according to applicable standards. Regardless of this, however, depending on the composition of the construction products and the way they are used, there may be requirements with regard to fire protection, health or environmental protection. Such requirements arise, for example, from the ban on the use of building materials that are also highly flammable in combination with other building materials, from material bans or restrictions as well as general regulations or principles of other legal areas (e.g. Chemicals Act, Hazardous Substances Ordinance, Water Management Act), from which restrictive provisions could be derived.


Our Curaflex® sealing inserts consisting of a frame 1.4301 (V2A) or 1.4571 (V4A) and an elastomer EPDM-TW (ethylene-propylene-dien rubber, suitable for drinking water) are suitable for contact with drinking water.
In accordance with the requirements of the Drinking Water Ordinance, appropriate test certificates are available for usability based on the elastomer guideline and the DVGW worksheet W270. The currently valid versions can be made available on request.

Fire protection systems

In accordance with the model pipe system directive (version 03/2000), flammable pipelines with a pipe outside diameter of> 32 mm must be sealed off with a R90-tested bushing.

Commercial non-combustible cement mortar, gypsum mortar or concrete of building material class DIN 4102-A can be used.

Yes, using the so-called "stand-alone solution"
lease do not hesitate to contact us for further information: 0049 4207/91 66 300

No, Inject BS + K10 is only suitable for fire protection partitioning of ring gaps.

Yes, e.g. the Curaflam fire protective collar XS Pro. It is installed on both sides in front of the wall or on one side under the ceiling and can be attached both later and during pipe laying.

Are there missing questions, then please let us know, we will add them!

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