The raw materials used have a great deal of influence on the material’s properties.
Material type
rubber
A material is a naturally or artificially produced substance that is to be further processed into semi-finished or finished products. The right material can be chosen based on the properties needed for your application. Important properties include hardness, elasticity, durability and cost.
How many plies?
no ply
Rubber with one or two inserts is stronger and more difficult to tear. Any pressure on the rubber is also distributed more effectively. However, most rubber is supplied without an insert.
Finishing: rubber
2 sides smooth
Color
transparent
Most of our product range comes in black, grey or white. We can also supply materials in other colours, such as red, yellow, green or blue. Please bear in mind that there is always some tolerance with respect to colour. The degree of tolerance varies between materials and is greater in some than in others.
Hardness (Shore A)
40 shore A
The Shore A hardness scale is used to indicate the hardness of rubber and sponge rubber. Shore A hardness concerns measuring the depth of impressions made in a material under a certain force, using a Shore A meter. Measuring the Shore A hardness of harder materials such as rubber should be done correctly, but there will always be some tolerance with respect to the measurement result. This is because there is tolerance on the material itself, which can sometimes be a little harder or softer. This difference can occur between different production batches, as well as within the same production batch. Of course, we select our raw material suppliers on the basis of consistent quality and hardness, but there will always be some degree of tolerance with respect to hardness.
Density
1300 kg/m³
A material’s compactness or density expresses the mass of that material present in a given volume. For most of our products, this is expressed in kg/m³. The manufacture of any given material always allows for tolerance on density. This cannot be avoided, unfortunately, but it is accurately tracked in quality controls. We measure the density or specific gravity of materials in accordance with international standards. This enables materials to be more effectively and accurately compared.
Density range and norm
1250 to 1350 kg/m³ (DIN EN ISO 845)
Possibilities Material
Self adhesive possibilities
without adhesive
The self-adhesive options depend on the properties, shape and intended application of the material. We can supply most materials unglued (without a self-adhesive side), with one self-adhesive side, and with two self-adhesive sides. However, some materials cannot have glue applied to them, and there are some profiles that we can only supply with one self-adhesive side.
Most sold thicknesses
2 and 3 mm
While the most commonly sold thicknesses provide an initial indication of the standard options available, there are many more possibilities. If the thickness you are looking for is not listed, please contact us. We can often can easily customise the thickness, and there may also be an alternative material that comes in the desired thickness.
Non standard thicknesses
on request for larger numbers
If you want a material in a non-standard thickness, we can usually help you very quickly. For many materials, we make our own sheets and rolls in any desired thickness. We peel the desired thickness from master blocks, and can do so with a short delivery time. For materials where we cannot do this ourselves (by request for larger quantities), we can often give a quick answer as to whether we are able to meet the request.
Max width of rolls
1200 mm
We produce strips and shapes from rolls of material. The standard roll width indicates the possibilities with respect to maximum dimensions.
UV resistance
very good
Ozone resistance
very good
Application with oil
bad
Sealing for which joint types
level/parallel
flat = smooth surface like metal/uneven = irregular surface like masonry/parallel = a joint that is very constant/gradient = a joint that varies a lot in thickness. Smooth and flat joints are not a problem, but irregular and gradient joints can be challenging. When it comes to masonry, for example, any unevenness should be properly accommodated but still provide a good seal. For gradient joints, the material should be very compressible, but still provide an effective seal in the areas where the tape is much less compressed.
Technical Properties Material
Temperature range
-60 °C to +220 °C, intermittent +230 °C
FMVSS302
compliant
The Federal Motor Vehicle Safety Standard (FMVSS) 302 is an international test that measures the flammability of a material. This standard specifies the burning behaviour exhibited by a material. If a material is compliant, this means that a certain minimum level of safety is guaranteed.
Brittle point
-80 °C (ASTM D746)
Change of volume: 7 days, 70 °C
< 5% (ISO 188)
Thermal conductivity
0,24 W/MK
Thermal conductivity indicates how a material conducts heat, and depends on temperature, density and moisture content. This value is calculated at 20°C
Compression set: 25%, 22h, 70 °C
< 15% (DIN 53518)
Compression set: 25%, 24h, 150 °C
25% (< 35%, DIN EN ISO 815 B)
The compression set measures how well a material expands back to its original thickness. During the test, a material is compressed by a specific percentage for a specific amount of time at a specific temperature. The loss is expressed as a percentage. The lower the percentage, the better.
Tensile strength MPa
10 MPa (> 9 MPa, ISO 37)
How much force must be applied before a material breaks? Tensile strength is a measure for classifying a material’s mechanical properties. The tensile strength limit value indicates the minimum amount of force or stress a material can withstand before it breaks.
Elongation
625% (> 500%, DIN 53504)
The elongation is a measure of the material’s elasticity, and relates to its tensile strength. It indicates the percentage by which the material is elongated when the specified force of tensile strength is used. The elongation is expressed as a percentage of the original length: 120% means that the material can be stretched by 20% of its original size before it breaks.
Tear resistance
23 N/mm (> 20 N/mm, ASTM D624-00)
Maximum % of compression
25%
This indicates the maximum percentage by which a material can be compressed without breaking the material. For example, if closed-cell foam is compressed by more than 50%, the cells burst. The maximum compression percentage for harder materials is much lower. Very soft materials with an open cell structure can often be almost completely compressed.
Maximum load
< 5 N/mm²
The maximum force that can be applied to rubber used in bearing structures.
Limiting oxygen index
0.24
Radiation resistance
>10^5 grays
Dielectric strength
23 kV/mm
Dielectric constant
2.9
Volume resistivity
3x10^15 Ω.cm
Applications, Standards
WRAS
compliant
FDA
compliant
FDA stands for the U.S. Food and Drug Administration. This safety standard is applied if any of our materials are to come in contact with food.
BRF part B11
compliant
EC 1935/2004
compliant
REACH
compliant
REACH is a European regulation that deals with which chemical substances should not be included in materials. The main idea behind it is the improved protection of human and environmental health from the risks of chemicals. This list of substances is regularly modified and expanded, and EKI monitors this on an ongoing basis.
RoHS
compliant
The RoHS (Restriction of Hazardous Substances) directive is concerned with limiting the use of hazardous substances in electrical and electronic equipment. This standard is therefore mainly used in the electrical industry and is regularly updated. EKI monitors this on an ongoing basis.
Recyclable
compliant
We are already recycling residual waste from our production process as much as possible. In most cases, this means grinding the rubber or foam into small pellets that are then reused as the basis for new products. If customers return residual waste, EKI includes it in this recycling process.
CFC and HCFC free
compliant
In short, the material is ozone-friendly. We get this question regularly at EKI, especially from sealant companies. Although the question is more applicable to some materials than to others, we have extended this notion throughout our entire range.
Shelf life
0,5 year
The amount of time a material may remain in stock after it has come in, before being used. This is based on an assumption of normal indoor conditions, and that the material is still in its original packaging. Our guideline is a temperature of 20°C and relative humidity of 40% to 50%.
HS code
40082190
HS (Harmonized System) code is an international standard for categorising goods, and is mainly used for export purposes.
General Description
Raw material
silicone
The raw materials used have a great deal of influence on the material’s properties.
Material type
rubber
A material is a naturally or artificially produced substance that is to be further processed into semi-finished or finished products. The right material can be chosen based on the properties needed for your application. Important properties include hardness, elasticity, durability and cost.
How many plies?
no ply
Rubber with one or two inserts is stronger and more difficult to tear. Any pressure on the rubber is also distributed more effectively. However, most rubber is supplied without an insert.
Finishing: rubber
2 sides smooth
Color
transparent
Most of our product range comes in black, grey or white. We can also supply materials in other colours, such as red, yellow, green or blue. Please bear in mind that there is always some tolerance with respect to colour. The degree of tolerance varies between materials and is greater in some than in others.
Hardness (Shore A)
40 shore A
The Shore A hardness scale is used to indicate the hardness of rubber and sponge rubber. Shore A hardness concerns measuring the depth of impressions made in a material under a certain force, using a Shore A meter. Measuring the Shore A hardness of harder materials such as rubber should be done correctly, but there will always be some tolerance with respect to the measurement result. This is because there is tolerance on the material itself, which can sometimes be a little harder or softer. This difference can occur between different production batches, as well as within the same production batch. Of course, we select our raw material suppliers on the basis of consistent quality and hardness, but there will always be some degree of tolerance with respect to hardness.
Density
1300 kg/m³
A material’s compactness or density expresses the mass of that material present in a given volume. For most of our products, this is expressed in kg/m³. The manufacture of any given material always allows for tolerance on density. This cannot be avoided, unfortunately, but it is accurately tracked in quality controls. We measure the density or specific gravity of materials in accordance with international standards. This enables materials to be more effectively and accurately compared.
Density range and norm
1250 to 1350 kg/m³ (DIN EN ISO 845)
Possibilities Material
Self adhesive possibilities
without adhesive
The self-adhesive options depend on the properties, shape and intended application of the material. We can supply most materials unglued (without a self-adhesive side), with one self-adhesive side, and with two self-adhesive sides. However, some materials cannot have glue applied to them, and there are some profiles that we can only supply with one self-adhesive side.
Most sold thicknesses
2 and 3 mm
While the most commonly sold thicknesses provide an initial indication of the standard options available, there are many more possibilities. If the thickness you are looking for is not listed, please contact us. We can often can easily customise the thickness, and there may also be an alternative material that comes in the desired thickness.
Non standard thicknesses
on request for larger numbers
If you want a material in a non-standard thickness, we can usually help you very quickly. For many materials, we make our own sheets and rolls in any desired thickness. We peel the desired thickness from master blocks, and can do so with a short delivery time. For materials where we cannot do this ourselves (by request for larger quantities), we can often give a quick answer as to whether we are able to meet the request.
Max width of rolls
1200 mm
We produce strips and shapes from rolls of material. The standard roll width indicates the possibilities with respect to maximum dimensions.
UV resistance
very good
Ozone resistance
very good
Application with oil
bad
Sealing for which joint types
level/parallel
flat = smooth surface like metal/uneven = irregular surface like masonry/parallel = a joint that is very constant/gradient = a joint that varies a lot in thickness. Smooth and flat joints are not a problem, but irregular and gradient joints can be challenging. When it comes to masonry, for example, any unevenness should be properly accommodated but still provide a good seal. For gradient joints, the material should be very compressible, but still provide an effective seal in the areas where the tape is much less compressed.
Technical Properties Material
Temperature range
-60 °C to +220 °C, intermittent +230 °C
FMVSS302
compliant
The Federal Motor Vehicle Safety Standard (FMVSS) 302 is an international test that measures the flammability of a material. This standard specifies the burning behaviour exhibited by a material. If a material is compliant, this means that a certain minimum level of safety is guaranteed.
Brittle point
-80 °C (ASTM D746)
Change of volume: 7 days, 70 °C
< 5% (ISO 188)
Thermal conductivity
0,24 W/MK
Thermal conductivity indicates how a material conducts heat, and depends on temperature, density and moisture content. This value is calculated at 20°C
Compression set: 25%, 22h, 70 °C
< 15% (DIN 53518)
Compression set: 25%, 24h, 150 °C
25% (< 35%, DIN EN ISO 815 B)
The compression set measures how well a material expands back to its original thickness. During the test, a material is compressed by a specific percentage for a specific amount of time at a specific temperature. The loss is expressed as a percentage. The lower the percentage, the better.
Tensile strength MPa
10 MPa (> 9 MPa, ISO 37)
How much force must be applied before a material breaks? Tensile strength is a measure for classifying a material’s mechanical properties. The tensile strength limit value indicates the minimum amount of force or stress a material can withstand before it breaks.
Elongation
625% (> 500%, DIN 53504)
The elongation is a measure of the material’s elasticity, and relates to its tensile strength. It indicates the percentage by which the material is elongated when the specified force of tensile strength is used. The elongation is expressed as a percentage of the original length: 120% means that the material can be stretched by 20% of its original size before it breaks.
Tear resistance
23 N/mm (> 20 N/mm, ASTM D624-00)
Maximum % of compression
25%
This indicates the maximum percentage by which a material can be compressed without breaking the material. For example, if closed-cell foam is compressed by more than 50%, the cells burst. The maximum compression percentage for harder materials is much lower. Very soft materials with an open cell structure can often be almost completely compressed.
Maximum load
< 5 N/mm²
The maximum force that can be applied to rubber used in bearing structures.
Limiting oxygen index
0.24
Radiation resistance
>10^5 grays
Dielectric strength
23 kV/mm
Dielectric constant
2.9
Volume resistivity
3x10^15 Ω.cm
Applications, Standards
WRAS
compliant
FDA
compliant
FDA stands for the U.S. Food and Drug Administration. This safety standard is applied if any of our materials are to come in contact with food.
BRF part B11
compliant
EC 1935/2004
compliant
REACH
compliant
REACH is a European regulation that deals with which chemical substances should not be included in materials. The main idea behind it is the improved protection of human and environmental health from the risks of chemicals. This list of substances is regularly modified and expanded, and EKI monitors this on an ongoing basis.
RoHS
compliant
The RoHS (Restriction of Hazardous Substances) directive is concerned with limiting the use of hazardous substances in electrical and electronic equipment. This standard is therefore mainly used in the electrical industry and is regularly updated. EKI monitors this on an ongoing basis.
Recyclable
compliant
We are already recycling residual waste from our production process as much as possible. In most cases, this means grinding the rubber or foam into small pellets that are then reused as the basis for new products. If customers return residual waste, EKI includes it in this recycling process.
CFC and HCFC free
compliant
In short, the material is ozone-friendly. We get this question regularly at EKI, especially from sealant companies. Although the question is more applicable to some materials than to others, we have extended this notion throughout our entire range.
Shelf life
0,5 year
The amount of time a material may remain in stock after it has come in, before being used. This is based on an assumption of normal indoor conditions, and that the material is still in its original packaging. Our guideline is a temperature of 20°C and relative humidity of 40% to 50%.
HS code
40082190
HS (Harmonized System) code is an international standard for categorising goods, and is mainly used for export purposes.
Disclaimers
The published technical data is based on research data and serves as a guide for the various applications. Due to the great diversity of products and application possibilities, the buyer must test himself whether the intended material meets the requirements. All information is subject to typing errors, mistakes and market developments and no rights can be derived from this.
