Conductive Masterbatch for ESD Sheets and Films
Conductive Masterbatch for ESD Sheets and Films: 6 Advantages for Manufacturers
In the fields of electronics, electromagnetic shielding and packaging, the application of conductive (ESD) sheets and conductive (ESD) films is becoming more and more widespread, and demand is growing. For example, conductive sheets and conductive films can be used to make electromagnetic shielding materials, such as the shielding layer of computer cases and communication equipment shells, which can effectively block the interference and radiation of electromagnetic waves. When producing conductive sheets (such as PP sheets, PS sheets, ABS sheets, etc.) or conductive films (such as PE films, PP films, PA films, etc.), manufacturers will choose conductive masterbatch to improve the conductivity of the materials. That is because conductive masterbatch has many advantages — six of which are explained below.
1. Why Conductive Sheets and Films Need Conductive Masterbatch
Sheets and films are produced from base resins that are naturally insulating. Rather than building a separate conductive coating line or handling conductive fillers as loose powders, manufacturers add a conductive masterbatch to the matrix material so that the conductive network is formed inside the product during the normal extrusion, calendering or blow moulding step.
| Product form | Typical base materials | Typical application |
| Conductive / ESD sheet | PP sheet, PS sheet, ABS sheet | Electromagnetic shielding layers, equipment shells, sensor parts |
| Conductive / ESD film | PE film, PP film, PA film | EM shielding, ESD packaging, precision part protection |
2. Six Advantages of Conductive Masterbatch
Improve electrical conductivity
Adjust surface and volume resistivity
Simplify production processes
Improve production stability
Enhance mechanical properties
Improve weather resistance and chemical stability
2.1 Improve Electrical Conductivity
As a functional additive, conductive masterbatch can be evenly dispersed in the base material of sheets and films to form a conductive network, thereby significantly improving the conductive properties of the material. For example, adding conductive masterbatches such as graphene or conductive carbon black to plastic sheets or films such as polystyrene can make the originally insulating material have good conductivity and meet the needs of electronic products, sensors and electromagnetic shielding.
2.2 Adjust Surface and Volume Resistivity
By adjusting the dosage of conductive masterbatch, the resistance values of conductive sheets and conductive films can be precisely controlled to adapt to different application scenarios. For example, for electromagnetic shielding materials that require higher conductivity, the amount of conductive masterbatch can be increased; for packaging materials that only need a certain antistatic ability, adding an appropriate amount of conductive masterbatch can meet the requirements.
2.3 Simplify Production Processes
Conductive masterbatch usually has good dispersibility and processability. When producing conductive sheets and conductive films, it can be directly mixed with the matrix material and then processed by extrusion, calendering, blow moulding, etc., without additional complicated processing steps — greatly simplifying the production process and improving production efficiency.
2.4 Improve Production Stability
Conductive masterbatch can ensure the uniform distribution of conductive components in sheets and films, reducing the problem of unstable product performance caused by the uneven distribution of conductive substances. For example, during the extrusion production process, the conductive masterbatch can be fully mixed with the matrix material to ensure that the conductive properties of the extruded sheet or film remain consistent throughout the product.
2.5 Enhance Mechanical Properties
Part of the conductive masterbatch can form a good interface combination with the matrix material, thereby improving the mechanical strength, toughness, wear resistance and other mechanical properties of the conductive sheet and conductive film. For example, in some conductive film applications that require frequent bending or folding, adding an appropriate conductive masterbatch can ensure that the material will not break or be damaged during repeated deformation.
2.6 Improve Weather Resistance and Chemical Stability
Conductive masterbatch can improve the weather resistance and chemical stability of sheets and films, allowing them to maintain good conductive properties under different environmental conditions. For example, for conductive films used outdoors, adding a conductive masterbatch with anti-ultraviolet and anti-oxidation properties can extend the service life of the material.
3. Matching the Masterbatch Dosage to the Application
The dosage of conductive masterbatch is the main lever for the electrical performance of the finished sheet or film. Use the table below as a starting direction, then confirm the final figure by measuring the surface and volume resistivity of the actual product.
| Target application | Electrical requirement | Dosage direction |
| Electromagnetic shielding layers, equipment shells | Higher conductivity | Increase the masterbatch dosage |
| Antistatic packaging, trays and liners | Certain antistatic ability only | Add an appropriate, moderate amount |
| Sensors and electronic components | Defined and repeatable resistivity | Adjust dosage to the target resistance value |
4. Processing Methods
Conductive masterbatch is dry-mixed with the matrix material and then processed using the same equipment as the standard product — no extra coating or finishing line is required.
Extrusion — masterbatch and resin are melt-compounded in the barrel and formed continuously.
Calendering — for sheet products with a defined thickness and surface finish.
Blow moulding — for conductive film production.
Note: because the recommended temperature profile and screw configuration depend on the matrix resin, the filler system and the equipment, they are not fixed here. Please refer to the grade TDS or contact the RenJie® technical team.
5. Choosing a Filler System
| Consideration | Conductive carbon black | Carbon nanotube | Graphene |
| Conductivity at equal loading | Moderate | Highest | High |
| Typical loading | Highest | Lowest | Low to moderate |
| Cost | Lowest | Highest | Medium to high |
| Main emphasis | Cost-driven conductivity | Efficient conductivity, axial heat conduction | Conductivity plus thermal and mechanical reinforcement |
Note: this table is general guidance for filler selection. The final choice should be confirmed by testing the actual sheet or film, because the achievable resistivity depends on the compounding and dispersion process.
6. Typical Applications
Electromagnetic shielding layers for computer cases and communication equipment shells
ESD packaging, trays and liners for electronic products
Sensor and precision electronic component protection
Conductive PP, PS and ABS sheets for equipment housings and internal parts
Conductive PE, PP and PA films for flexible ESD applications
7. RenJie® Conductive Masterbatch Portfolio
PE conductive compound / conductive masterbatch — CT-08A, designed for conductive films of 0.015 mm to reach 1.0E+04 – 1.0E+06 Ω at 30–60% addition.
Carbon nanotube-based conductive compound — C403, with high elasticity, toughness and axial thermal conductivity.
Polycarbonate (PC) conductive masterbatch — for ESD and electromagnetic shielding parts, with surface resistance typically down to 10³–10⁵ Ω.
PVC conductive compound — the SA series, including SA 509C for PVC ESD cable, hardness 85 A – 60 D, flame retardant V-0.
8. Frequently Asked Questions (FAQ)
Which base materials can be made conductive with conductive masterbatch?
Conductive sheets are commonly produced from PP, PS and ABS, and conductive films from PE, PP and PA. In each case the masterbatch is dry-mixed with the matrix material and processed on standard equipment.
How do I control the resistivity of the finished sheet or film?
By adjusting the dosage of conductive masterbatch. A higher dosage raises conductivity — used for electromagnetic shielding — while a moderate dosage is enough for materials that only need a certain antistatic ability. The final figure should be verified by measuring the surface and volume resistivity of the product.
Does adding conductive masterbatch require new processing equipment?
No. Conductive masterbatch is mixed directly with the matrix material and processed by extrusion, calendering or blow moulding, so no additional complicated processing steps are needed.
Will conductive masterbatch reduce the mechanical properties of the film?
Not if the grade is chosen correctly. Part of the conductive masterbatch forms a good interface combination with the matrix material, which can improve mechanical strength, toughness and wear resistance — so films that must be bent or folded repeatedly keep their integrity.
Can conductive films be used outdoors?
Yes. Conductive masterbatch improves the weather resistance and chemical stability of sheets and films. For outdoor conductive films, a grade with anti-ultraviolet and anti-oxidation properties extends the service life of the material.
What is the difference between an ESD sheet and an ESD film?
The difference is the product form and the base material: sheets are thicker, semi-rigid products such as PP, PS and ABS boards used for shielding layers, housings and structural parts; films are thin, flexible products such as PE, PP and PA films used for shielding, packaging and precision part protection.
9. Get RenJie® Conductive Masterbatch
RenJie® supplies conductive masterbatch and conductive compounds for ESD sheets and films. Tell us your base resin, product form (sheet or film), thickness, target surface or volume resistivity and processing method, and our technical team will recommend the right grade and dosage.
Conductive masterbatch for PP, PS and ABS sheets
Conductive masterbatch for PE, PP and PA films
Graphene, carbon nanotube and conductive carbon black systems
Application support — dosage calculation, dispersion advice and processing guidance