Non Reinforced Elastomer Spacers

Non-reinforced elastomer spacers type N 15, N 20

Product description

The type N15 and N20 non-reinforced elastomer spacers are washers made of vulcanised EPDM-based rubber with both of their surfaces smooth. They are used as bearings for stays, beams, joists, ceilings. They are also used with tension force values of up to 15 N/mm2 (for type N15) and up to 20 N/mm2 (for type N20).

Non-reinforced elastomer spacers guarantee transfer of load to the support component, ensure freedom of turning of the parts on the supports and reduction of horizontal forces caused by contraction, temperature influence and deformation. They prevent emergence of excessive load eccentricity on the support and tension concentration on the edge.

Type N 15 and N 20 non-reinforced elastomer spacers are manufactured as square, rectangular or circular panels with holes (circular, oval, open) or without holes.

Dimensions:

  • thickness t: 5 mm, 10 mm, 15 mm, 20 mm
  • sides:

               width b: 50÷1400 mm
               length l: 50÷12000 mm

Designation:
t – spacer thickness, mm
b – spacer width, mm
l – spacer length, mm
d1 - opening diameter, mm
D - spacer diameter, mm
d2 - opening length, mm

 

As standard, the non-reinforced type N15 and N20 elastomer spacers come in panels sized 1000 mm x 1400 mm, with option of trimming down to size.

Technical and assembly remarks

Elastomer spacers must be placed on support components close to the reinforcement bars of the support component.

The non-reinforced elastomer spacers are used wherever no dynamic loads arise. For dynamic loads, reinforced elastomer parts should be used.

 

Fire resistance characteristics

The non-reinforced linear elastomer spacers hold fire examination certificate no. LPP01-1256/12/200NP conducted by the Fire Research Department of the Polish Building Research Institute. According to the test report, the line spacers conform to the requirements for fire resistance class REI 120. When choosing spacers, one needs to consider the scope of spacer damage/degradation according to the table included in the Technical Approval, available at the website www.betomax.pl in the Downloads section.

 

Technical approvals, test reports

  • Technical Approval
  • Fire test report
  • Strength test report

 

Order details

 

t x b x l mm

t – spacer thickness, mm
b – spacer width, mm
l – spacer length, mm

 

 

 

 

Crosswise tension forces from spacer linear deformation


Within bearing class 2, if a more precise proof is not required, the following calculations may be made:

Zq = 1,5 · F · t · a · 10-5

Zq - crosswise tension force, N
F - load, N
t - spacer thickness, mm
a - spacer shorter side, mm

In order for the support component to take over the crosswise tension force, additional reinforcement needs to be placed in the support component.
Load parallel to the spacer surface (deformations from horizontal shift), protection against shifting.
Maximum allowable deformation angle and horizontal shift range are calculated as follows:

tan γ - deformation angle, -
t - spacer thickness, mm
u - horizontal shift, mm

 

 

Crosswise tension forces from spacer linear deformation,. Constant external loads parallel to the spacer surface are not allowed. When taking on short-term external horizontal loads, the fulfilment of the following condition of protection against shifting is recommended:

H1 + H2 ≤ 0,05 · F
H2 = b ⋅ l ⋅ G ⋅ tan ɣ

H1 - external horizontal load [N]
H2 - external force from deformation [N]
tan γ - deformation angle
G - cross elasticity modulus (1,5 N/mm2)
F - load [N]
b, l - spacer side length values [mm]

For short-term external horizontal load influences, the maximum allowable deformation angle may not be exceeded.

Turn angle

The allowable turn angle from deformation and deflection of the component supported on the base structure, taking into account bearing surface roughness and obliqueness, is calculated as follows:

 α - turn angle, rad

When dimensioning adjacent structure components (the supported component and the supporting component), consider the option of emergence of load eccentricity due to spacer deformation caused by influence of vertical force and turn.

e - eccentricity

 

 

 

Rigidity

If two spacers, of different shapes, are used under one structural component (in one line), then the following proportion (condition) may not be exceeded:

 

this condition may not be exceeded.
In case this condition is not met, proof of takeover of the entire load by the individual (single) spacers must be provided.

 

N15 type spacer dimensioning

N15 non-reinforced elastomer spacer
Spacer thickness 5 mm
Allowable tensions, allowable  σm, N/mm²
Length / width
[mm]
50
75
100
125
150
175
200
250
300
350
400
1000
50
15,00
75
100
125
150
175
200
250
300
350
400
1000
Standard horizontal shift ± 12,6 mm
N15 non-reinforced elastomer spacer
Spacer thickness 10mm
Allowable tensions, allowable  σm, N/mm²
Length / width
[mm]
50
75
100
125
150
175
200
250
300
350
400
1000
50
4,69
6,75
8,33
8,33 8,33 8,33 8,33 8,33 8,33 8,33 8,33 8,33
75
6,75
10,55
13,78









100
8,33
13,78

125
8,33



15,00




150
8,33
175
8,33
200
8,33
250
8,33
300
8,33
350
8,33
400
8,33
1000
8,33
Standard horizontal shift ± 5,6mm
N15 non-reinforced elastomer spacer
Spacer thickness 15mm
Allowable tensions, allowable  σm, N/mm²
Length / width
[mm]
75
100
125
150
175
200
250
300
350
400
450
1000
75
4,62
6,13
7,36
8,33
8,33
8,33
8,33
8,33
8,33 8,33 8,33 8,33
100
6,13
8,30
10,32
12,0
13,48
14,80
14,80
14,80
14,80

125
7,36
10,32
13,00

150
8,33
12,00
15,00
175
8,33
12,00
200
8,33 13,48
250
8,33 14,80
300
8,33 14,80
350
8,33 14,80
400
8,33
450
8,33
1000
8,33
Standard horizontal shift ± 9,1mm
N15 non-reinforced elastomer spacer
Spacer thickness 20mm
Allowable tensions, allowable  σm, N/mm²
Length / width
[mm]
50
75
100
125
150
175
200
250
300
350
400
1000
50
1,17
1,69
2,08
2,08
2,08 2,08 2,08 2,08 2,08 2,08 2,08 2,08
75
1,69
2,64
3,44
4,12
4,69
4,69 4,69 4,69 4,69 4,69 4,69 4,69
100
2,08
3,44
4,69
5,79
6,75
7,59
8,33
8,33
8,33 8,33 8,33 8,33
125
2,08
4,12
5,79
7,32
8,72
9,97
11,09
13,02
13,02
13,02
13,02
13,02
150
2,08
4,69
6,75
8,72
10,55
12,23
13,78

175
2,08
4,69
7,59
9,97
12,23
14,36

200
2,08
4,69
8,33
11,09
13,78

250
2,08 4,69 8,33 13,02
15,00
300
2,08 4,69 8,33 13,02
350
2,08 4,69 8,33 13,02
400
2,08 4,69 8,33 13,02
1000
2,08 4,69 8,33 13,02
Standard horizontal shift ± 12,6mm
N20 non-reinforced elastomer spacer
Spacer thickness 5mm
Allowable tensions, allowable  σm, N/mm²
Length / width
[mm]
50
75
100
125
150
175
200
250
300
350
400
1000
50
18,75
20,00
75

100
125
150
175
200
250
300
350
400
1000
Standard horizontal shift ± 2,1mm
N20 non-reinforced elastomer spacer
Spacer thickness 10mm
Allowable tensions, allowable  σm, N/mm²
Length / width
[mm]
50
75
100
125
150
175
200
250
300
350
400
1000
50
4,69
6,75
8,33
8,33 8,33 8,33 8,33 8,33 8,33 8,33 8,33 8,33
75
6,75
10,55
13,78
16,48
18,75
18,75 18,75 18,75 18,75 18,75 18,75 18,75
100
8,33
13,78
18,75

125
8,33 16,48
20,00
150
8,33 18,75
175
8,33 18,75
200
8,33 18,75
250
8,33 18,75
300
8,33 18,75
350
8,33 18,75
400
8,33 18,75
1000
8,33 18,75
Standard horizontal shift ± 5,6mm
N20 non-reinforced elastomer spacer
Spacer thickness 15mm
Allowable tensions, allowable  σm, N/mm²
Length / width
[mm]
75
100
125
150
175
200
250
300
350
400
450
1000
75
4,62
6,13
7,36
8,33
8,33
8,33
8,33
8,33
8,33 8,33 8,33 8,33
100
6,13
8,33
10,32
12,0
13,48
14,80
14,80
14,80
14,80
14,82
14,82
14,82
125
7,36
10,32
13,00
15,52
15,52
17,73
19,72

150
8,33
12,00
15,52
18,76

175
8,33
13,78
17,73

200
8,33 14,80
19,72
250
8,33 14,80
20,00
300
8,33 14,80
350
8,33 14,80
400
8,33 14,82
450
8,33 14,82
1000
8,33 14,82
Standard horizontal shift ± 9,1mm
N20 non-reinforced elastomer spacer
Spacer thickness 20mm
Allowable tensions, allowable  σm, N/mm²
Length / width
[mm]
50
75
100
125
150
175
200
250
300
350
400
1000
50
1,17
1,69
2,08
2,08
2,08 2,08 2,08 2,08 2,08 2,08 2,08 2,08
75
1,69
2,64
3,44
4,12
4,69
4,69 4,69 4,69 4,69 4,69 4,69 4,69
100
2,08
3,44
4,69
5,79
6,75
7,59
8,33
8,33
8,33 8,33 8,33 8,33
125
2,08
4,12
5,79
7,32
8,72
9,97
11,09
13,02
13,02
13,02
13,02
13,02
150
2,08
4,69
6,75
8,72
10,55
12,23
13,78
16,48
18,75
18,75
18,75
18,75
175
2,08
4,69
7,59
9,97
12,23
14,36
16,33
19,87

200
2,08
4,69
8,33
11,09
13,78
16,33
18,75

250
2,08 4,69 8,33 13,02
16,48
19,87

300
2,08 4,69 8,33 13,02 18,75
20,00
350
2,08 4,69 8,33 13,02 18,75
400
2,08 4,69 8,33 13,02 18,75
1000
2,08 4,69 8,33 13,02 18,75
Standard horizontal shift ± 12,6mm

Remark:
1. Spacers having other dimensions should be calculated appropriately to determine the allowable tension forces.
2. The maximum allowable tension for the spacers is 15 N/mm2 (for type N15) and 20 N/mm2 (for type N20).


Type N3 non-reinforced elastomer spacers

 

Product description

Type N3 non-reinforced elastomer spacers are vulcanised EPDM-based rubber equalisation inlays with both surfaces smooth. They are used for applications at spots not under threat of atmospheric conditions and ultraviolet light.
They guarantee controlled transfer of loads and allow limited horizontal deformations with a low enforcement factor, as well as allowing support element twisting. They also allow one to avoid excess load eccentricity and load pressures. At the same time, small roughness areas and divergences of parallelity of adjacent surfaces are equalised.
These spacers are used for low static loads.

Type N3 non-reinforced elastomer spacers are manufactured as square, rectangular or circular panels with holes (circular, oval, open) or without holes.

Dimensions:

  • thickness t: 5 mm, 10 mm, 15 mm, 20 mm
  • sides:

                width b: 50÷1400 mm
                length l: 50÷12000 mm

 

Designation:
t – spacer thickness, mm
b – spacer width, mm
l – spacer length, mm
d1- opening diameter, mm
d2 - opening width, mm
D - spacer diameter, mm

As standard, the non-reinforced type N3 elastomer spacers come in panels sized 1000 mm x 1400 mm, with option of trimming down to size.

Technical and assembly remarks

Elastomer spacers must be placed on support components close to the reinforcement bars of the support component.

The non-reinforced elastomer spacers are used wherever no dynamic loads arise. For dynamic loads, reinforced elastomer parts should be used.

 

Order details

 

t x b x l mm

t – spacer thickness, mm
b – spacer width, mm
l – spacer length, mm

 

 

 

 

 Crosswise tension forces from spacer linear deformation


Within bearing class 2, if a more precise proof is not required, the following calculations may be made:

Zq = 1,5 · F · t · a · 10-5

Zq - crosswise tension force, N
F - load, N
t - spacer thickness, mm
a - spacer shorter side, mm

Note:
In order for the support component to take over the crosswise tension force, the support component shall need additional reinforcement.

 

Type R5 non-reinforced elastomer spacers

Product description

Type R5 elastomer spacers are equalising spacers made of a polyurethane-rubber composite with both face surfaces smooth. They are foreseen for use at spots not threatened by weather conditions and ultraviolet light.
They guarantee controlled transfer of loads and allow limited horizontal deformations with a low enforcement factor, as well as allowing support element twisting. They also allow one to avoid excess load eccentricity and load pressures. At the same time, small roughness areas and divergences of parallelity of adjacent surfaces are equalised.
These spacers are used for low static loads.

Type R5 non-reinforced elastomer spacers are manufactured in the shape of square, rectangular or circular spacers, with or without holes.

Dimensions:

  • thickness t: 5 mm, 10 mm, 15 mm, 20 mm
  • sides:

               width b: 50÷1400 mm
               length l: 50÷12000 mm

Designation:
t – spacer thickness, mm
b – spacer width, mm
l – spacer length, mm
d1- opening diameter, mm
d2 - opening width, mm
D - spacer diameter, mm

As standard, the type R5 spacers come in blocks sized 1000 mm x 1400 mm, with option of trimming down to size.

 

Technical and assembly remarks

Elastomer spacers must be placed on support components close to the reinforcement bars of the support component.

The non-reinforced elastomer spacers are used wherever no dynamic loads arise. For dynamic loads, reinforced elastomer bearings should be used.

 

Order details

 

 

t x b x l mm

t – spacer thickness, mm
b – spacer width, mm
l – spacer length, mm

 

 

 

Crosswise tension forces from spacer linear deformation.


Within bearing class 2, if a more precise proof is not required, the following calculations may be made:

Zq = 1,5 · F · t · a · 10-5

Zq - crosswise tension force, N
F - load, N
t - spacer thickness, mm
a - spacer shorter side, mm

In order for the support component to take over the crosswise tension force, the support component shall need additional reinforcement.

 

 

Non-reinforced elastomer spacers with elastomer core, type TD 21 S

Product description

Type TD 21 S linear spacers are solid band spacers, made up of a core of EPDM-based vulcanised rubber and filler foam. They are foreseen for bearing of flat roofs, ceilings, beams and joists. These spacers are used for smaller shift values (up to ±5,6 mm) for the purpose of determination of the support fixed point at loads up to 8 N/mm2 or up to 15 N/mm2. They prevent the emergence of rifts due to horizontal shifts, and protect the support surface edges against excessive loads; they also prevent the creation of rifts caused by wall slants. These spacers are used for supporting monolithic reinforced concrete components and those manufactured in situ.
They are used for the purpose of determination of the fixed point, or, in case of minimum supported structure shifts, i. e. of the ceiling or roof, etc. These length and turn angle changes of the supported component are compensated by non-dilatational strain of the spacer core.

The type TD 21S band spacers are manufactured as rectangular panels.


Dimensions:

  • thickness t: 5, 10 mm
  • side dimensions:

                   spacer width b: 115 ÷ 365 mm
                   spacer core width: 25, 50 mm
Designation:
t – spacer thickness, mm
bE - spacer core width, mm
b – spacer width, mm
l – spacer length, mm (l=1000 mm)


The standard spacer length is one running metre. It is possible to design a type TD 21 S linear spacer having different dimensions.

 

Technical and assembly details.

Elastomer spacers must be placed on support components close to the reinforcement bars of the support component.

 

Fire safety conditions

The non-reinforced linear elastomer spacers hold fire examination certificate no. LPP01-1256/12/200NP conducted by the Fire Research Department of the Polish Building Research Institute. According to the test report, the line spacers conform to the requirements for fire resistance class REI 120. When choosing spacers, one needs to consider the scope of spacer damage/degradation according to the table included in the Technical Approval, available at the website www.betomax.pl in the Downloads section.

 

Technical approvals, test reports

  • Technical Approval
  • Fire test report
  • Strength test report

 

 

Order details

 

t x bE /b mm

t – spacer thickness, mm
bE – spacer core width, mm
b – spacer width, mm

l – spacer length, mm

 

 

 

 

Spacer thickness
t [mm]
Elastomer core width
bE [mm]
Spacer width
b [mm]
Rotation angle *
[‰]
Mean tension value
[N/mm2]
Allowable load
F [kN/m]
Horizontal shift
[mm]
5
25
115
40
8
200
± 2,1
150
175
200
240
300
365
5
50
115
20
15
750
± 2,1
150
175
200
240
300
365
10
50
115
40
8
400
± 5,6
150
175
200
240
300
365
Standard spacer length is one running metre.