Description
Emigraph MEDIUM 280x280mm are Advanced Graphene EMI Shielding Composite Sheets
Emigraph MEDIUM 280x120MM is a high-quality graphene composite EMI shielding sheet, perfect for shielding sensitive electronic devices. With graphene composites Emigraph’s cutting-edge technology, we offer an effective solution for blocking and neutralizing electromagnetic radiation. Our composite sheets provide exceptional shielding capabilities, ensuring that devices and enclosures constructed from our materials are well-protected from the harmful effects of radiation.
70 dB / 1 mm of sample
This allows to dump most of the radiation impinging the blocker or enclosure of the device made from our material.
Say goodbye to concerns about radiation impact on sensitive electronics. Emigraph’s composite sheets offer a reliable and robust solution, providing unmatched protection and peace of mind.
Experience the future of radiation shielding with Emigraph. Our expertise and commitment to innovation have paved the way for excellence in the field. Choose Emigraph and unlock the superior shielding capabilities of our Composite Sheet Materials. Trust us to deliver the optimal solution for your electromagnetic radiation shielding needs.
Lead time
If the ordered product is currently in stock, it will be dispatched within 1-2 business days once the payment has been recorded or a proof of payment has been provided.
Electrical properties
EMI shielding effectiveness
Visualizing EMI Shielding
EMI shielding effectiveness is a diagram that illustrates the capability of a material or enclosure to attenuate electromagnetic interference (EMI). It provides a visual representation of the material’s ability to block or reduce the intensity of electromagnetic radiation across a range of frequencies. The diagram shows the shielding effectiveness as a function of frequency, allowing engineers and designers to evaluate the performance of different materials and select the most suitable options for their EMI shielding needs. The higher the shielding effectiveness value on the diagram, the better the material’s ability to protect against EMI, ensuring the integrity and functionality of electronic devices in various applications.
The best attenuation results were obtained for the samples with a graphene concentration of 10% (samples 135 and 140). For these samples, attenuation of >60 dB was achieved in the range 240 – 320 GHz). The lowest attenuation values were obtained for the samples with the lowest concentration (i.e. 0.5%).
Electromagnetic radiation transmission
The electromagnetic radiation transmission diagram showcases the behavior of electromagnetic waves as they pass through different materials or barriers. It provides a visual representation of how various materials interact with and affect the transmission of electromagnetic radiation across different frequencies. The diagram allows engineers and scientists to assess the transparency or opacity of materials to specific types of electromagnetic radiation, such as visible light, radio waves, or X-rays. By studying this diagram, one can gain insights into the materials’ properties and make informed decisions regarding their applications, such as in optics, telecommunications, or medical imaging. Understanding the transmission characteristics of electromagnetic radiation is essential for designing efficient systems and optimizing the performance of devices that rely on the controlled passage or blocking of specific radiation frequencies.
The addition of graphene as a filler to the ABS polymer matrix reduces the transmission of electromagnetic radiation compared to pure ABS composite(Fig.2.(a)). The electromagnetic shielding mechanism accounts for 30% of reflected radiation, while the remaining radiation is absorbed (Fig.2(b)).
Low frequency shielding of electromagnetic radiation
The low-frequency shielding diagram illustrates the effectiveness of materials in attenuating electromagnetic radiation at low frequencies. It provides valuable insights into the ability of different materials to block or reduce low-frequency electromagnetic radiation, such as those emitted by power lines or electronic devices. The diagram displays the shielding effectiveness of materials across a range of low frequencies, enabling engineers and researchers to select the most suitable materials for shielding applications in these frequency ranges. Understanding the performance of materials in low-frequency shielding is crucial for ensuring electromagnetic compatibility, reducing interference, and maintaining the integrity of sensitive electronic systems.
Volumetric resistance
The diagram on the volumetric resistance of materials provides insights into their electrical properties and their ability to conduct or resist the flow of electric current through their volume. In this study, the volumetric resistance of the materials was measured using a dielectric resonator operating at a frequency of approximately 5 GHz. The diagram showcases the variation in volumetric resistance across different materials, enabling assess their conductivity and suitability for various applications. Understanding the volumetric resistance of materials is crucial in fields such as electronics, telecommunications, and power transmission, as it helps determine their performance, efficiency, and ability to withstand electrical stresses.The dependence of the volume resistance from the concentration of the filler shows Figure 4.
Mechanical properties
Tensile strength
The measurement will be carried out with a INSTRON 8501 endurance machine and extensometer.
Sample nr | Thickness | Width | Tensile strength σm | Elongation em | E |
|---|---|---|---|---|---|
| I-1 | 3,76 mm | 9,96 mm | 21,1 MPa | 1,3 MPa | 2690 GPa |
| I-2 | 3,76 mm | 9,95 mm | 19,9 MPa | 1,1 MPa | 2790 GPa |
| I-3 | 3,79 mm | 9,96 mm | 19,6 MPa | 1,0 MPa | 2600 GPa |
| III-1 uv | 3,75 | 9,90 | 22,8 MPa | 1,4 MPa | 3240 GPa |
| III-2 uv | 3,76mm | 9,90 mm | 21,1 MPa | 0,99 MPa | 2910 GPa |
| III-3 uv | 3,80 mm | 9,95 mm | 20,5 MPa | 0,92 MPa | 2950 GPa |
presents relationship between stress and elongation for I-1 (a) and III-1 (b) samples.
Tensile strength
Young’s modulus was estimated for a specific deformation and material constant E.
Sample No. / Temp. [℃] | 1 [MPa] | 2 [MPa] | 3 [MPa] | 4 [MPa] | 5 [MPa] |
|---|---|---|---|---|---|
| 21 | 2500 | 2540 | 2540 | 2580 | 2570 |
| 50 | 5650 | 5570 | 5580 | 5460 | 5470 |
| 110* | 1480 | 1570 | 1540 | 1500 | – |
| *The study of the modulus of elasticity of the samples at the temperature of 110⁰C caused slight overheating, which resulted in the sample flowing. | |||||
Other properties
- Material: Glass transition temperature [℃]
- Sample 105,8 [℃]
Thermal process
The Thermal Process diagram in the Emigraph graphene composites illustrates the temperature-dependent behavior and transformations during manufacturing and post-processing stages. This diagram provides valuable insights into the thermal properties of Emigraph composites, including the glass transition temperature, curing temperature, and thermal stability.
By analyzing the Thermal Process diagram,you can optimize the manufacturing parameters and understand the thermal behavior of Emigraph composites under different conditions. It helps in determining the appropriate processing temperatures, heating and cooling rates, and post-processing steps to achieve desired material properties and performance.
Additionally, the diagram aids in assessing the thermal stability of Emigraph composites, indicating their ability to withstand high temperatures without significant degradation. This information is crucial for applications that involve exposure to elevated temperatures, such as aerospace, automotive, and electronic components.
By leveraging the insights provided by the Thermal Process diagram of Emigraph graphene composites can be precisely tailored to meet specific thermal requirements, ensuring their optimal performance and longevity in diverse applications.
Criterion | Sample No. | ||||
|---|---|---|---|---|---|
| 1.1 | 1.2 | 1.3 | 1.4 | 1.5 | |
| Total burning time with flame for each sample | 80 | 78 | 81 | 85 | 79 |
| Total burning time with flame for all samples | 403 [s] | ||||
| Time of burning and glowing of the sample after the second application of the burner flame | – | – | – | – | – |
| Inflammation of cotton by falling drops | YES | YES | YES | YES | YES |
| Glowing or burning of any sample to the mounting clamp | YES | YES | YES | YES | YES |
Criterion | Sample No. | ||||
|---|---|---|---|---|---|
| 2.1 | 2.2 | 2.3 | 2.4 | 2.5 | |
| Total burning time with flame for each sample | 82 | 80 | 78 | 79 | 79 |
| Total burning time with flame for all samples | 398 [s] | ||||
| Time of burning and glowing of the sample after the second application of the burner flame | – | – | – | – | – |
| Inflammation of cotton by falling drops | YES | YES | YES | YES | YES |
| Glowing or burning of any sample to the mounting clamp | YES | YES | YES | YES | YES |
Tensile strength
The density was estimated according to the methodology described in the standards:
- EN ISO 845 – Cellular plastics and rubbers – Determination of apparent density
- EN ISO 1183 – Plastics – Methods for determining the density of non-cellular plastics
– Part 1: Immersion method, liquid pycnometer method and titration method.
Parameter | Sample 1 | Sample 2 | Sample 3 |
|---|---|---|---|
| Dry weight [g] | 38,09 g | 39,2 g | 39,62 g |
| Mass in liquid [g] | 7,99 g | 9,18 g | 9,52 g |
| Weight after removal [g] | 38,14 g | 39,25 g | 39,65 g |
| Apparent density [g / cm3] | 0,998 g/cm3 | 1,030 g/cm3 | 1,039 g/cm3 |
Viscosity
Viscosity is an important rheological property of injection molding materials as it controls the transport rate of liquid materials which can lead to casting defects such as hot tears and porosity. Most experimental measurements might be performed with rotational and oscillatory viscometers. Viscosity testing was outsourced to Anton Paar. Samples from the same series were subjected to viscosity tests on an oscillating rheometer. It was necessary to perform a viscoelastic test using an oscillating rheometer, because the sample was not yet liquid at the temperature of 180 ° C, which made rotational measurement impossible.
Viscosity for mutual cohesion of viscous and elastic. Viscous are the strength-related deformation properties of the activities that appear at a point. Elasticity is related to the restoration of reversal deformations under the property of properties that disappear immediately after its subtraction. Viscosity is already arising what it is. Elasticity is a measure of a material’s ability to recover after deformation.
The measurement was performed in the polymer processing temperature range of 180-300℃. As it can be seen, the viscosity of the viscoelastic medium decreases with increasing temperature. At a temperature of ca. 285℃, the viscosity stabilizes and remains at the same level even at higher temperatures.
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