Why Static Control Matters in Manufacturing
Electrostatic discharge (ESD) can destroy or degrade electronic components in ways that aren’t always visible. A single uncontrolled discharge can damage integrated circuits and introduce latent defects that lead to field failure. For electronics manufacturers and packaging operations, consequences can range from returned product to complete assembly losses.
Electronics assembly lines add another layer of complexity. Static charge damages electronic components and can attract particulates which create contamination. Packaging materials specified for this environment needs to control static discharge reliably across varying humidity levels and repeated handling cycles.
How TOPSTAT Roll Stock Provides Static Control
The electrical performance of TOPSTAT comes from conductive carbon black, an internal additive that creates a network of conductive pathways through the HIPS matrix. Unlike topical anti-static treatments that degrade with handling or abrasion, carbon black that is compounded into the resin provides permanent conductivity. Once extruded, it maintains its electrical properties without refreshing, recoating, or replacement.
Surface Resistivity Ranges Explained
Static control plastics are characterized by their surface resistivity, or the measure of how readily an electrical charge moves across the surface of the material. T.O. Plastics produces TOPSTAT roll stock across a wide range of resistivities, allowing engineers to specify the right level of static control for the application.
| Type | Surface Resistivity (ohms) | Typical Use |
| Conductive | < 10⁶ Ω/sq | Grounding surfaces, ESD bags |
| Static Dissipative | 10⁶–10¹⁰ Ω/sq | Packaging, assembly lines |
| Anti-Static | 10¹¹–10¹⁴ Ω/sq | Static buildup prevention, packaging |
These ranges align with international ESD control standards, including ANSI/ESD S20.20 and IEC 61340-5-1. The specific resistivity target for a given application should be confirmed with the processor, as electrical performance varies with part geometry and design.
Features and Benefits of TOPSTAT Roll Stock
Permanent ESD Protection
The distinction between a surface coating and an internal additive is significant for applications that demand long-term static control. Topical anti-static coatings can degrade with repeated handling, cleaning, or exposure to processing chemicals. An internal additive compounded into the HIPS resin won’t wear off the surface, because the conductive network runs through the material itself. For roll stock thermoformed into trays that see repeated use, that permanence is a meaningful performance advantage.
Consistent Electrical Performance
T.O. Plastics engineers TOPSTAT to deliver stable resistivity across the full roll. Distributing conductive carbon black throughout the resin rather than applying it to the surface means the electrical performance is consistent across all thermoformed parts. That consistency matters in production environments where every part needs to meet the same electrical performance specifications.
Strong and Durable HIPS Material
TOPSTAT retains the structural characteristics that make HIPS a well-established thermoforming material. Mechanical properties include:
- Static decay rate: < .01 seconds at 10% RH
- Flexural modulus: 220,000 psi (ASTM D-790B)
- Tensile elongation at break: 40% (ASTM D-638)
- Notched Izod impact: 5 ft-lbs./in (ASTM D-256A)
- Heat deflection temperature: 154°F at 264 psi (ASTM D-648)
- Specific gravity: 1.09 (ASTM D-792)
Reliable in Low Humidity Environments
Many static-control materials depend on ambient moisture to function properly. In manufacturing environments where humidity is controlled or simply low, moisture-dependent ESD protective materials become unreliable. TOPSTAT’s carbon black-based conductivity is independent of humidity, making it a dependable choice for temperature-controlled warehouses and other environments where atmospheric moisture is not constant.
Common Applications for TOPSTAT Roll Stock
Electronics Packaging
Electronics packaging is the most common application for conductive, static dissipative, and anti-static plastics. TOPSTAT roll stock thermoforms into integrated circuit (IC) trays, component carriers, and ESD shipping packaging that protect sensitive assemblies from the point of production through final delivery. This combination of protection and structural performance in a single material simplifies the packaging design process and eliminates the need for secondary ESD treatments.
Assembly Line Applications
Static charge attracts airborne contaminants, such as dust, fibers, and particulates, which can settle on components and cause defects. Protective trays and workstation surface materials made from TOPSTAT roll stock address both ESD and contamination risk simultaneously. Assembly lines handling sensitive electronics benefit from the consistent resistivity that TOPSTAT delivers across the range of parts that move through the line.
Industrial and Manufacturing Uses
Industrial manufacturing environments create their own static-control demands. TOPSTAT thermoforms into ESD-safe trays and containers that withstand the impact and dimensional demands in heavy-use production settings.
Automotive Industry Uses
Automotive manufacturing relies on sensitive electronic components, such as control modules, sensors, driver-assistance systems, and powertrain electronics, that require ESD protection throughout their supply chain. TOPSTAT roll stock thermoforms into the parts shipping trays and protective packaging used to move these assemblies between suppliers and assembly facilities. The material’s durability under repeated handling cycles and its reliable ESD performance across varied environmental conditions make it a practical choice for automotive electronics packaging.
TOPSTAT Roll Stock Specifications
Available Gauges and Widths
TOPSTAT roll stock is available in the following standard dimensions:
- Gauge: 18 - 88 mil (0.018 - 0.088 in)
- Width: 24 - 58 inches
T.O. Plastics also produces standard HIPS roll stock for applications where static control is not required.
Mechanical Properties
TOPSTAT retains the full mechanical property profile of high-quality HIPS roll stock. It thermoforms cleanly into complex geometries while maintaining dimensional stability up to 154°F, giving trays and carriers the structural performance they need across repeated handling cycles.
Electrical Performance Range
T.O. Plastics produces TOPSTAT across a wide surface resistivity range, from conductive (< 10⁶ Ω/sq) through static dissipative (10⁶–10¹⁰ Ω/sq) to anti-static (10¹¹–10¹⁴ Ω/sq). The internal additive formulation enables engineers to target the specific ohms range required by each application.
TOPSTAT vs. Other Static Control Materials
Choosing the right static control material means understanding what separates permanent, material-level protection from solutions that degrade over time or fall short in demanding environments. Here's how TOPSTAT compares to the most common alternatives.
TOPSTAT vs. Anti-Static Coated Plastics
Surface-coated anti-static plastics apply a dissipative coating to the substrate's exterior after extrusion. This approach works but it comes with limitations: the coating is on the surface which is handled, abraded, washed, and exposed to chemicals over the product’s service life. TOPSTAT’s internal additive provides static control that doesn’t degrade with use. For applications where packaging moves through multiple handling cycles or is reused across production runs, the permanence of an internal additive is a significant advantage. TOPSTAT also offers a coating option for applications where an internal additive isn’t required.
TOPSTAT vs. Carbon-Filled Plastics
TOPSTAT is a carbon-filled HIPS which is a common approach to static control. The performance and cost considerations of these products hinge on resin selection and formulation. TOPSTAT is designed to meet electrical performance targets, using HIPS as the base resin, which provides a predictable combination of ESD protection and formability.
Why Manufacturers Choose TOPSTAT Roll Stock
TOPSTAT solves a problem that standard HIPS cannot: reliable, permanent static control. For manufacturers who need ESD protection without sacrificing formability, TOPSTAT is the straightforward choice.
Reliable ESD Protection
ESD failures in electronics manufacturing are expensive and often difficult to trace. A component that sustains latent ESD damage during packaging or transit may not fail until it’s in the customer’s hands. TOPSTAT roll stock provides a consistent, verifiable level of ESD protection that can be tested and documented as part of a broader ESD control program. Its performance meets international standards, and its properties remain stable throughout the material’s service life.
Thermoforming Compatibility
TOPSTAT is designed specifically for roll stock processing. It thermoforms cleanly into the trays and packaging that electronics manufacturers and their suppliers use to protect sensitive components. The material's gauge consistency and mechanical properties support high-yield thermoforming production, and the resulting parts meet the dimensional tolerances required by precision electronics packaging.
Custom Electrical Performance
Different applications within electronics manufacturing and packaging require different levels of static control. A shipping tray for finished assemblies has different ESD requirements than a component carrier moving through an assembly line. T.O. Plastics tunes the internal additive formulation to target the specific ohms range required by the application, giving engineers a material that matches their ESD specification rather than a one-size-fits-all solution.
Industries That Use TOPSTAT Materials
Wherever sensitive electronics move through manufacturing and distribution, static control is a non-negotiable requirement. TOPSTAT roll stock serves industries where the cost of an ESD failure outweighs the cost of preventing it.
Electronics Manufacturing
Electronics manufacturers are the primary users of ESD protective plastics. ESD risk is present at every stage of electronics manufacturing, from component fabrication through final packaging. TOPSTAT roll stock produces the trays and packaging that protect components at every stage.
Semiconductor Production
Semiconductor devices are among the most static-sensitive of all manufactured electronics. TOPSTAT roll stock can be used in the wafer carriers and component packaging that move semiconductor products through fabrication and distribution without exposing them to damaging electrostatic events.
Automotive Industry
Vehicles contain a growing number of sophisticated electronic systems. Automotive electronics packaging uses TOPSTAT roll stock to protect control modules and sensors throughout the supply chain and assembly process.
Aerospace and Defense Electronics
Aerospace and defense applications place high demands on ESD-protective materials, often requiring compliance with stringent military and industry standards. TOPSTAT's consistent electrical performance and durability make it a viable material for the trays and packaging used in aerospace electronics assembly and logistics.
Choosing the Right TOPSTAT Roll Stock
The appropriate TOPSTAT grade depends on the application's electrical requirements, the geometry of the thermoformed part, and the environment in which it will operate. T.O. Plastics works with engineers and procurement teams to match the material to the specification before production begins.
Determine Required Resistivity Range
The first step is to identify whether the application requires conductive, static-dissipative, or anti-static performance. That determination depends on the sensitivity of the components being handled and the requirements of the ESD control standard that the operation follows.
- Conductive materials (< 10⁶ Ω/sq) are appropriate for grounding applications.
- Static-dissipative materials (10⁶–10¹⁰ Ω/sq) are the most common choice for electronic packaging.
- Anti-static materials (10¹¹–10¹⁴ Ω/sq) are appropriate for applications where the goal is preventing static buildup rather than actively dissipating charge.
Consider Forming and Mechanical Needs
The thermoforming geometry of the finished part affects the gauge and width requirements. Deeper draws, meaning parts with significant depth relative to their opening, require sufficient gauge to maintain wall thickness as the material stretches. Complex geometries place higher demands on the material's ability to stretch without cracking.TOPSTAT thermoforms well across its available gauge range, but confirming the thickness specification against the part geometry is an important step in the design process.
Evaluate Environmental Conditions
If the packaging will be used in a low-humidity environment, a moisture-dependent ESD protective coating may not deliver consistent performance. TOPSTAT’s carbon black-based internal additive is independent of humidity, which makes it the more reliable choice for controlled or dry environments. If the application involves elevated temperatures, the material’s heat deflection temperature of 154°F should be evaluated against the expected service conditions.
Work With an ESD Protection Partner
T.O. Plastics works with engineers and procurement teams to confirm material capability before production begins. Contact T.O. Plastics to discuss your roll stock requirements and request a quote.
TOPSTAT Product Data Sheets
FAQ: TOPSTAT Roll Stock
What is TOPSTAT roll stock used for?
TOPSTAT roll stock is used to produce packaging and components that prevent electrostatic discharge (ESD) in electronics manufacturing. Common applications include IC trays, component carriers, ESD-safe shipping packaging, workstation surfaces, and industrial grounding components.
Is TOPSTAT conductive or anti-static?
TOPSTAT can be engineered to be conductive, static-dissipative, or anti-static depending on the required resistivity range. The internal additive formulation allows the electrical performance to be targeted to the specific application.
What material is TOPSTAT made from?
TOPSTAT is made from high impact polystyrene (HIPS) internally compounded with conductive carbon black additives. The carbon black provides permanent static control without relying on surface coatings that can degrade with handling.
How does TOPSTAT protect electronics?
TOPSTAT safely dissipates or conducts electrical charge away from sensitive components. Depending on the grade specified, it can provide a controlled path to ground for electrostatic charge (conductive and static-dissipative grades) or prevent static buildup on the packaging surface (anti-static grade).
Can TOPSTAT be thermoformed?
Yes. TOPSTAT is designed for roll stock processing and thermoforming applications. Its HIPS base provides the thermoformability and dimensional stability required for packaging and component carrier production.
What is the difference between TOPSTAT’s coating and internal additive options?
Coatings are a topical application that provides static control but has a shelf life and can degrade with handling. Internal additives are permanent. Conductive carbon black is compounded directly into HIPS resin, making static control an inherent property of the material. Conductive performance can only be achieved through internal additives.
