National technical approval / General construction technique permit
Approval No.:
Z-16.8.468
Applicant:Getzner Werkstoffe GmbH
Validity:
from: May 18, 2021
until: May 18, 2026

Controlled item:
Getzner Sylodyn®

The aforementioned item is herewith granted a general construction techniquepermit. This Notice consists of nine pages.
This national technical approval / general construction technique permit supersedes the national
technical approval No. Z-16.8-468 dated August 4th, 2016. The subject was first granted a national
technical approval on August 4th, 2016.

Translation of the original German version, not verified by the Deutsches Institut für Ba utechnik.

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GENERAL PROVISIONS
1This Notice is evidence of the usability/applicability of the controlled item according to thefederal building codes.

2This Notice does not replace the statutory permits, approvals and certificates that are required
when carrying out building projects.

3This Notice is issued without prejudice to the rights of third parties, in particular privat e
property rights.

4Notwithstanding the further regulations set out under "Particular Provisions", copies of thisNotice are to be made available to the installer/user of the controlled item. The installer/userof the controlled item is hereby also advised that a copy of this Notice must be provided at theitem’s place of use or installation. If requested, copies must be provided to the relevantauthorities.

5This Notice may only be reproduced in its entirety. The publication of excerpts requires theagreement of the Deutsches Institut für Bautechnik (DIBt). Text and drawings in promotional
material must not contradict this Notice. Translations of this document must include thedisclaimer, "Vom Deutschen Institut für Bautechnik nicht geprüfte Übersetzung der deutschen
Originalfassung" (translation of the original German version, not verified by the DIBt).

6

This Notice is valid until revoked. Its provisions may be complemented or amended
retrospectively, especially in the light of new technical developments.

7

This Notice is based on the statements and documents submitted by the applicant. Anychanges to these underlying assumptions are not covered by this Notice and must be notified
to the Deutsches Institut für Bautechnik without delay.

8

The general construction technique permit covered by this Notice is at the same time thenational technical approval for the construction technique.

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PARTICULAR PROVISIONS

1

Controlled item and area of use/application

1.1

Approved item
"Getzner Sylodyn", the approved item, is a compact, unreinforced elastomer bearing made ofpolyurethane (PU). It is used for the absorption of forces and deformation perpendicular to theplane of the bearing.
The bearings must be rectangular, point, strip or square in shape.
Various coloured markings are used to distinguish one type of bearing from another.

1.2

Subject of permit
This permit covers the planning, design, and implementation of elastomer bearings for building
structures. The components adjoining the bearing must be made of steel, concrete or wood.
The use of foils above or below the bearing is not permitted. The elastomer bearings can beused at temperatures of between -25°C and 50°C. For brief, recurring periods of less than 8hours, the bearings may be exposed to temperatures of up to +70°C.
Although elastomer bearings can absorb shear deformation, they must not be used for thesystematic absorption of permanent external shear forces.
The bearing is supplied without any holes.
An assessment of its vibration isolation properties is not covered by this approval.

2Provisions for construction products
2.1
2.1.1

Properties and composition
Dimensions
Point and strip bearings employed in multi-layer configurations must be bonded together .
Bonding is not necessary in the case of multi-layer surface bearings. Only bearings of thesame type may be layered on top of each other.
The following conditions with regard to the bearing dimensions must be met:
Thickness of a bearing in a single-layer configuration/thickness of an elastomer layer:t = 12.5 mm to 25 mm
In the case of bearings:
amax = 1500 mm
In the case of point bearings:t ≤ a/5
For bearings whose shorter side is less than a ≤ 500 mm:
t ≥ a/30
In the case of rectangular bearings:a ≥ 70 mm, b ≥ 70 mm,
where:tthickness of the unloaded bearingashorter bearing sidebZ23784.21

longer bearing side

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With regard to the tolerances to be observed:
Length Class L3 as per DIN ISO 3302-1:2016
WidthClass L3 as per DIN ISO 3302-1:2016
Thickness
Class EC3 as per DIN ISO 3302-1:2016
Materials
The physical characteristics, chemical composition and material properties of the bearing andadhesive are held by the Deutsches Institut für Bautechnik.
Evidence of the properties of the original materials and adhesive used is to be provided bymeans of an inspection document 3.1 as per DIN EN 10204:2005-01.

2.2
2.2.1

Production, transport and labelling
Production, transport
The bearings are to be produced by a foaming process in the form of mats or rolls and thencut to size.
Detailed information regarding the production process is held by the Deutsches Institut fürBautechnik.
The manufacturer's instructions regarding the transport and installation of the bearings must
be observed.

2.2.2

Should any bonding have to be done on site, this must be carried out in accordance with thedocumentation held by the Deutsches Institut für Bautechnik. The bonding procedure is to bedocumented.
Labelling
The manufacturer is to label the delivery note accompanying the bearing with the mark ofconformity (“Ü-sign”) according to the applicable mark of conformity regulations. Labelling may
only take place if the requirements set out in section 2.3 have been satisfied. The label must
be applied to the mats or rolls produced according to section 2.2.1 permanently andcontinuously, with any necessary changes ("mutatis mutandis").

2.3
2.3.1

Certificate of compliance
GeneralA certificate of compliance on the basis of factory-internal production checks and regular thirdparty inspections, including an initial test of the bearing in accordance with the provisions set
out below, must be provided by every production plant to confirm that the bearing complies
with the provisions of this national technical approval/general construction technique permit.
For the purposes of issuing the certificate of compliance and carrying out the third-part yinspection, including the necessary product tests, the manufacturer of the bearings must
employ the services of a recognised certification body and a recognised inspection body .
The manufacturer is to make the declaration of compliance by labelling the construction
products with the mark of conformity (“Ü-sign”) and indicating their intended use. If this should
not be possible in any particular instance, the package slip accompanying the bearing mustbe labelled with the mark of conformity (“Ü-sign”) according to the applicable mark ofconformity regulations.
For information purposes, the certification body is to provide the Deutsches Institut fürBautechnik with a copy of the certificate of compliance it issued.
The Deutsches Institut für Bautechnik must also be given a copy of the initial inspection report.

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Factory-internal production checks
Every production plant is to establish and carry out internal production checks. By factory internal production checks are meant the continuous monitoring by the manufacturer of theproduction process. This monitoring process is designed to ensure that the construction
products produced by the manufacturer comply with the provisions of this national technicalapproval.
The factory-internal production checks must take place according to the testing plan held by
the Deutsches Institut für Bautechnik.
The results of the factory-internal production checks are to be recorded and evaluated. As aminimum requirement, the records must contain the following information:-Designation of the construction product and/or its original material and constituent parts,-Type of check or inspection,-

Date of manufacture and testing of the construction product and/or its original material
or constituent parts,-Results of the checks and inspections and, where applicable, comparison with therequirements,
Signature of the individual responsible for the factory-internal production checks.

-2.3.3

The records are to be retained for at least five years. They are to be submit ted on request to
the Deutsches Institut für Bautechnik and the appropriate highest building authority.
If the inspection result is unsatisfactory, the manufacturer is to implement the necessarycorrective actions without delay. Construction products that do not meet the requirements areto be dealt with in such a way that any possibility of mistaking them for approved products isexcluded. Assuming it is technically possible and required as evidence that the deficiency has
been remedied, the relevant inspection is to be repeated as soon as the corrective actions
have been implemented.
Third-party inspection
The factory-internal production checks carried out in every bearing production plant are to beaudited regularly, and at least twice a year, by a third-party inspection body. The results of thetests carried out by the manufacturer in accordance with section 2.3.2 are to be statisticallyevaluated.
An initial test of the bearing is to be carried out as part of the third-party inspection. In addition,
samples are to be taken for random testing purposes. The sampling and testing procedures
are the responsibility of the respective monitoring body.
The scope and frequency of the third-party inspection are to be found in the testing plan heldby the Deutsches Institut für Bautechnik.
The results of the certification and third-party inspection are to be retained for at least fiveyears. The certification body and/or monitoring body shall, on request, submit the results to
the Deutsches Institut für Bautechnik and the appropriate highest building authority.

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Provisions for planning, design and implementation

3.1

Planning
The planning is governed by the technical building regulations, unless stated otherwise below.
Bearings can be installed in a single-layer or multi-layer configuration. The dimension
constraints specified in section 2.1.1 must be observed. The bearing dimensions are to befound in the specifications provided by the structural engineer and in the installation plans.
A static calculation is to be carried out in every case to verify the structural safety of thebearings at load-bearing capacity limits for all critical dimensioning situations and load cases.
The verification concept set out in DIN EN 1990:2010-12 in conjunction with the National
Annex applies. The bearings may only be used for static or quasi-static loaded components.
The type, dimensions and arrangement of the bearings are derived from the proof of stability.
Once the bearings have been selected, and insofar as required by the installation situation,
an installation plan is to be drawn up showing the exact position of the bearings within thestructural layout.
Installation is to take place in accordance with the manufacturer's instructions.

3.2

DesignThe design is governed by the technical building regulations, unless stated otherwise below.
The possible load-case combinations are to be found in DIN EN 1990.2010-12.
The design values of the effect of the actions (stresses) Ed are to be determined from thecharacteristic values of the actions, taking into account the partial safety factor yf and thecombination values ᴪ as set out in the technical building regulations.
The following calculations must be provided at load-bearing capacity limits

𝐸⊥ 𝑑≤1𝑅⊥ 𝑑where:E ⊥dload on bearing perpendicular to the plane of the bearing [N/mm²]R⊥ddesign value of associated load-bearing capacity of bearing [N/mm²] perpendicular
to the plane of the bearing as a function of shape factor S at a linear compression of
ε = 40% as per Table 1 (40% linear compression is a failure criterion)

Sshape factor for rectangular cross sections: S =a·b2· 𝑡( 𝑎+𝑏)

where a, b, t as per section 2.1.1

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Table 1: Load-bearing capacity of the bearing when subjected to a load perpendicular to the planeof the bearing

Load-bearing capacity design value R⊥d [N/mm²]

Standard type

NB

ND

NF

HRB
3000

HRB
60002

HRB
120002

Shape factor 0.51

0.13

0.52

1.33

2.40

5.000

5.76

Shape factor 1.0

0.14

0.67

2.30

4.40

9.16

12.72

Shape factor 1.5

0.15

0.74

2.94

5.74

11.82

20.90

Shape factor 2.00.15

0.79

3.48

6.88

14.23

30.28

Shape factor 2.5

0.16

0.82

3.81

7.58

15.72

40.88

Shape factor 3.0

0.16

0.83

4.01

8.01

16.64

52.68

Shape factor 3.5

0.16

0.84

4.14

8.29

17.23

52.68

Shape factor 4.0

0.16

0.85

4.23

8.47

17.62

52.68

Shape factor 4.5

0.16

0.85

4.29

8.59

17.89

52.68

Shape factor 5.0

0.16

0.86

4.33

8.68

18.09

52.68

Shape factor 5.5

0.16

0.86

4.36

8.75

18.23

52.68

Shape factor 6.0

0.16

0.86

4.38

8.80

18.33

52.68

Shape factor ≥ 6.00.160.86

4.38

8.80

18.33

52.68

1) Bearings w ith shape factors S < 0.7 are for bonded bearings only.
2) Bonded bearings of types HRB 6000 and HRB 12000 must be reduced by 25% compared to the values show n in
the table.

The interaction with the load-bearing behaviour of the bearing must be considered when
designing the components adjacent to the bearing. It should be noted that putting a load onan elastomer bearing produces a load concentration. The distortion of elastomer bearings
causes eccentricity in the load concentration, which generates a self-aligning torque.
When determining the effects on the structure as a whole, the linear compression of thebearing is to be considered a product-specific value. Should the contact surfaces of theadjacent components not exhibit plane-parallelism, e.g. as a result of manufacturing andinstallation tolerances, this must be taken into account in the design of the bearing. As long as
more detailed information is not forthcoming, the rotation angle of the adjacent component s
must be calculated by the addition of the following factors:-Oblique angle with 10 ‰-Unevenness with 0.625 mm/a [‰]wherea in [mm]If the adjacent components are made of steel or in-situ concrete, the unevenness figure canbe halved.
In the event of distortion across two sides of a bearing that are perpendicular to each other, acomponent representing angular distortion must be added proportionally to the respective
design values.
Positional stability must be verified.

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For the standard point bearings shown in Table 1a, the maximum twist for a rotation parallel tothe centre line of side b is calculated as follows: 𝑏,𝑚𝑎𝑥 =500 · 𝑡≤ 54 ‰
𝑎whereb, maxmaximum torsion angle for a rotation parallel to the centre line of side btthickness of the unloaded bearing in mmashorter bearing side in mm

The formula is used analogously to calculate the maximum torsion angle parallel to the centre
line of side a. In the structural design, evidence must be provided to show that should
maximum linear compression occur at the same time as maximum torsion, contact with theedges of adjoining components will be avoided.
The following limit condition must be observed if a torsional load is applied on two axes:

 𝑅𝑒𝑠𝑢𝑙𝑡𝑖𝑒𝑟𝑒𝑛𝑑𝑒 = √ 𝑎,𝑚𝑎𝑥 2 +  𝑏,𝑚𝑎𝑥 2 ≤ 54 ‰The tensile force generated in the adjoining components as a result of the fact that thereinforced elastomer bearing cannot expand is to be calculated and absorbed by means ofappropriate measures.
The tensile force affecting the adjacent components as a result of the centric load applied tothe bearing is calculated as follows:

𝑍𝑎 = 1,5 · 𝐸⊥ 𝑑 · a · t

𝑍𝑏 = 1,5 · 𝐸⊥ 𝑑 · b · twhere:
Za

tensile force perpendicular to the shorter side of the bearing a [N]Zbtensile force perpendicular to the longer side of the bearing b [N]The tensile stress calculation is only required when using bearing types Sylodyn NF,
HRB 3000, HRB 6000 and HRB 12000.
The extension rate of the bearing depends on its format. It must be taken into account when
designing the supporting framework (edge distances, etc.). Contact the manufacturer inadvance and ask them to provide this figure.
Do not prevent the systematic deformation of the lateral surfaces of the bearing.
3.3

Implementation
The implementation is governed by the technical building regulations, unless stated otherwis ebelow.
The bearings must be stored in a dry place and installed in a dry state. Store rolls of material
upright. Store adhesive according to the manufacturer's instructions. Protect the bearings fromdirect sunlight. The subsoil must be smooth and level. To protect the bearing, carefully deburr
the supporting surfaces. Avoid cavities in adjacent concrete surfaces. If necessary, use a bedof mortar to even out any height differences. The adjoining components must be compatible
with the material used in the bearing. Ensure that the bearing and the adjoining components
are not damaged by any chemical or physical effects and are kept free of contamination. The
surfaces of adjacent components must be clean and free of any snow, ice, grease orseparating agent. Standing water must be avoided. The manufacturer's installation
instructions must be observed.

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The construction company shall confirm in writing according to paras. 16a section 5, 21 section
2 MBO that the bearing has been installed in accordance with the provisions of the national
technical approval covered by this Notice.
4Provisions for use, maintenance and servicing
The bearings are to be installed such that they require no maintenance.

Andreas Schult

Certified

Head of Division

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