Developing a plastic component is one thing – producing it thousands of times with consistent quality is another. Between the initial idea and ongoing series production lie numerous decisions that determine quality, cost, and delivery capability.
For companies that are having plastic parts manufactured for the first time or are looking for a new production partner, transparency in the process is crucial. This article shows how a component is created at a medium-sized plastics specialist—from the initial conversation to series production—and what matters at each stage.
The key points at a glance
The path from prototype to series production comprises five clearly defined phases: requirements analysis, tooling concept, sampling, production ramp-up, and ongoing production.
An in-house toolmaking department significantly shortens development times and enables fast iterations between sampling and optimization.
IATF 16949-certified processes ensure quality from the first sample part to the millionth production part.
The close collaboration between design, toolmaking, and production under one roof is the decisive advantage of medium-sized specialists over pure contract manufacturers.
Design for manufacturability in the early phase saves time and costs later – the earlier the manufacturing partner is involved, the better.
Phase 1: Requirements analysis and material selection
It all starts with a conversation
Every project begins with a thorough requirements analysis. Together with the customer, we clarify:
What mechanical, thermal, and chemical loads must the component withstand?
Are there any standards or approvals (e.g., UL94, FDA, REACH)?
What quantities are planned—and over what time frame?
What surface requirements apply (visual quality, texture, color)?
Are there any geometric features (undercuts, tight tolerances, thin walls)?
Material recommendation with foresight
Based on this analysis, our engineers recommend the optimal material. In doing so, we consider not only the technical requirements, but also processability, availability and costs. Whether glass fiber–reinforced polyamide for mechanically stressed components, flame-retardant ABS for electrical housings or food-grade PP – the choice of material lays the foundation for a successful project.
Phase 2: Design for manufacturability and tooling concept
Design for Manufacturing
Before the tool is made, we check the component design for manufacturability. Wall thicknesses, draft angles, gate position and weld lines – all these factors influence the later part quality and cycle time. The earlier we are involved, the more optimization potential we can realize.
The tooling concept
Our in-house toolmaking department develops the tooling concept based on the approved design. In doing so, we define: the number of cavities, the gating system (cold runner or hot runner), the cooling concept, the demolding strategy, and the tool material. The advantage of short distances: toolmaking and injection molding production operate under one roof—questions are resolved in minutes, not days.
Phase 3: Tool manufacturing and sampling
Precision in toolmaking
Tool manufacturing is the core of the entire process. Using modern CNC milling machines and EDM equipment, molds are produced with accuracies in the hundredth-of-a-millimeter range. Depending on the complexity, tool manufacturing takes between four and twelve weeks.
Sampling: The moment of truth
During initial sampling, the tool is sampled on the injection molding machine for the first time. We produce initial parts, measure them completely, and create an initial sample inspection report (EMPB). Do dimensions, surface, and function meet the requirements? If not, we optimize iteratively – thanks to our in-house toolmaking without time loss due to external service providers.
Typically, one to three sampling loops are required until all parameters are perfectly adjusted. For simple parts, it may also be correct on the first attempt.
Phase 4: Production ramp-up and process validation
From sample part to stable series production
Following approved sampling, production ramp-up begins. In this phase, we validate the entire manufacturing process under series conditions: cycle time, machine stability, scrap rate, and packaging. For automotive customers, we prepare the complete PPAP documentation.
Freeze process parameters
Once all parameters are stable, they are frozen and documented. Each machine, each tool, and each process parameter is clearly assigned. This ensures that the component can be reproduced identically even after a production interruption.
Phase 5: Ongoing series production and quality assurance
Production with a system
In ongoing series production, we monitor every shot. Automatic inline quality monitoring, statistical process control (SPC), and regular sample measurements ensure consistent quality. Our IATF 16949 certification guarantees that these processes not only exist but are also consistently applied.
Tool maintenance and optimization
Injection molds are subject to wear. Regular maintenance intervals extend their service life and ensure part quality. Thanks to our in-house toolmaking, we can carry out maintenance quickly and in a planned manner – without long downtimes or external coordination.
Why a medium-sized specialist?
Large injection molding corporations have impressive machine parks – but medium-sized companies have different strengths:
Short decision-making processes: From the managing director to the machine operator—all are familiar with your project.
Flexibility: Changes to the tool or process are implemented quickly, rather than passed through committees.
Everything under one roof: toolmaking, injection molding, 2K technology, and assembly – no interfaces with subcontractors.
Personal contact: Dedicated contacts who support your project from the initial inquiry through to ongoing series production.
Regional proximity: Visits to the toolmaking department and participation in sampling – all easily possible.
Conclusion
The path from prototype to series production is not a leap, but a structured process with clearly defined milestones. Those who take this path with an experienced partner save time, avoid costly missteps, and ultimately receive a component that excels in both quality and cost-effectiveness.
The key factor: Involve your manufacturing partner as early as possible. The more manufacturing know-how is incorporated into the design phase, the smoother the entire process will be – and the better the final result. Paragraph
Interested in series production?
We are happy to support you from the prototype through to series production.
Flame retardancy in plastic injection molding is a critical factor for electrical engineering components. Whether housings, connectors or insulators: without effective fire protection, plastic parts can quickly catch fire. This article explains which flame retardancy classes are relevant, how flame retardants affect material properties, and which regulations must be observed. It also provides practical tips, presents testing methods, and highlights how the electrical industry in particular benefits from suitable flame-retardant systems.
The key points at a glance
Flame retardancy classes provide information about the fire safety of plastics, especially in electrical engineering.
Flame retardants affect physical and mechanical properties, so their selection requires careful consideration.
Long-term performance and reliability of flame-retardant plastics are essential for safe components.
Laws and international standards regulate the approval of flame retardants.
Processing-related challenges in injection molding can be overcome through process optimization and the use of additives.
Environmental aspects and sustainability are becoming increasingly important in flame-retardant modified plastics.
Introduction – Why flame retardancy in plastic injection molding is crucial for electrical engineering components
In electrical engineering, flame-retardant plastic components are indispensable. Housings for switchgear or insulating parts in medical devices require reliable fire protection. Plastics without flame retardancy burn quickly, posing significant risks. With targeted flame-retardant solutions, you can prevent fires or slow their spread.
The material should change as little as possible. In our experience, injection molding is ideal for producing complex shapes in a practical and cost-efficient way—provided that the flame retardant is compatible with the plastic. Only then does the protection remain permanently effective, even when the parts are subjected to thermal and mechanical stress.
Requirements vary: In medical technology, hygiene and chemical resistance play a role alongside fire protection, while industrial applications often have to withstand high temperatures and harsh environments. This fundamentally influences the selection and integration of flame-retardant systems.
Fundamentals of flame retardants – types, modes of action, and standards
There are two main types of flame retardants: additive and reactive. Additive types are simply mixed into the plastic without altering the polymer structure. These include halogenated substances, phosphorus compounds, or mineral fillers such as aluminum hydroxide.
Reactive flame retardants chemically bond to the polymer, providing better protection and preventing leaching. The choice of the right additive depends on the plastic as well as on technical and environmental requirements.
The most important flame retardancy classes are measured according to standards such as UL 94. This system ranges from V-0 (the best self-extinguishing performance) to V-2. For electrical engineering components, at least V-0 is usually required to ensure there is no risk during operation.
Standards such as IEC 60695 or UL 94 define testing methods. They are crucial for certification and ensure reliable fire protection.
Smoke development is also important: ISO 1210 measures how much smoke is generated during burning. This is particularly important for electrical applications, as smoke impairs visibility and can be toxic. The choice of flame retardant therefore also affects this safety aspect.
Any questions?
Overwhelmed by the standards and regulations that apply to electrical components? We are happy to help and advise you.
Flame retardancy in plastic injection molding: What matters for electrical engineering components – requirements and standards
Strict global regulations govern fire protection in electrical engineering. Standards such as UL 94, IEC 60335 or EN 60695 define the required flame retardancy class depending on the application—whether in industry, household appliances, or building technology.
Laws also require non-toxic flame retardants that do not release hazardous gases in the event of a fire. Material labeling and documentation are also mandatory.
As requirements differ globally, product development often varies as well. European regulations differ, for example, from those in North America or Asia.
Manufacturers must ensure that their flame retardants comply with all relevant regulations.
Another key aspect is traceability. In the event of safety issues, it enables a rapid response. Therefore, precise documentation and controls throughout the supply chain are essential.
REACH and RoHS regulations also play a role. They prohibit hazardous substances, ensure approvals, and protect markets in the long term.
Selection of suitable plastics and flame-retardant systems for electrical engineering applications
Choosing the right material is the first step toward safe components. Typical materials include polyamides (PA), polycarbonates (PC), and polyphenylene sulfides (PPS). They offer mechanical strength, good injection molding properties, and are suitable for flame retardancy.
Flame retardants affect the materials. Mineral fillers can make components more brittle, while phosphorus compounds increase heat resistance. The combination must therefore be precisely tailored to the application.
Table 1 shows typical plastic–flame retardant combinations in electrical engineering:
Plastic
Flame retardant
Application examples
PA 6
Aluminium hydroxide, phosphorus compounds
Connectors, switch housings
PC
Halogen-free, phosphorus
LED lighting, touchscreens
PPS
Silicates, phosphorus
Motor components, sensor housings
Sometimes it is worthwhile to combine different flame retardants to achieve better performance.
Coupling agents improve compatibility between flame retardants and the polymer, ensure uniform distribution, and prevent deposits. This also enhances mechanical and processing properties.
Flame retardants must also be temperature-resistant so that they do not decompose during the injection molding process.
Integration of flame retardancy in plastic injection molding – challenges and solutions
Flame retardants have a significant impact on injection molding. They alter the melt flow and make mold filling more difficult. Mineral fillers cause faster tool wear.
For this reason, manufacturers adapt the tools and processes. For example, higher temperatures or longer injection times can help. Wear-resistant seals in machines increase service life.
Component surfaces are also affected by additives—hardness and appearance can be improved.
Close collaboration between material suppliers, injection molders, and developers leads to the best results and reduces scrap.
Regular maintenance and process monitoring prevent machine failures. Integrated inline measurement technology detects deviations immediately.
Training for operators helps explain the specifics of processing flame-retardant plastics and ensures quality.
Practical examples from electrical engineering – successful projects by Schröder + Heidler
Schröder + Heidler, for example, developed a heat-resistant housing for circuit breakers that meets UL 94 V-0 and remains permanently stable. Another project involved halogen-free connectors for sustainable electrical installations in Europe, where the flowability of the materials was hardly affected.
Such cases show how modern flame-retardant systems can be applied in practice and successfully certified.
In addition to technology, Schröder + Heidler places great emphasis on comprehensive documentation and process control. In this way, the company meets high safety and quality standards.
These examples demonstrate that flame-retardant solutions can be both cost-effective and environmentally friendly at the same time.
Environmental and safety aspects of flame retardants in injection molding
The environmental compatibility of flame-retardant plastics is crucial. Halogen-free flame retardants such as phosphorus- or nitrogen-based compounds release fewer toxic gases in the event of a fire and are often more suitable for recycling.
Mineral fillers such as aluminum hydroxide are non-toxic and leave no residues.
Some flame-retardant systems make recycling more difficult because they change material properties. Manufacturers are therefore developing sustainable concepts that combine functionality and environmental compatibility.
Health protection during production and in the event of a fire is becoming increasingly important. Flame retardants with low toxicity and minimal smoke generation improve safety for users and employees.
In the future, researchers are increasingly focusing on bio-based substances and renewable resources to minimize environmental impact.
Quality control and testing methods for flame-retardant plastic components
Standardized testing ensures fire protection. UL 94 flammability tests show how quickly plastics extinguish after exposure to flame.
Glow-wire tests (IEC 60695-2) simulate thermal stress at specific points. Long-term tests show whether components retain their properties.
The measurement of toxic gases in the event of a fire is also part of quality control.
Checklists and flowcharts make it easier to organize testing processes.
Non-destructive testing methods such as ultrasound or thermal imaging cameras are also used today. They detect defects already during series production without destroying the material.
The tests also ensure that flame retardancy remains effective over the entire service life despite aging.
Future trends – innovations in flame retardancy and sustainable materials
Research is focusing on environmentally friendly flame retardants. Bio-based additives, nanoparticles, and multifunctional additives sound promising.
Digitalization and AI help to better control the injection molding process and to optimize materials more specifically.
Combinations of advanced flame-retardant systems and sustainable plastics meet future regulatory requirements and customer demands alike.
New testing and simulation methods also accelerate development and improve product quality.
Awareness of the circular economy is growing. Recycled materials and lightweight plastics with integrated flame retardancy are becoming increasingly important future topics.
Conclusion – Safe and efficient flame retardancy in plastic injection molding with Schröder + Heidler
Flame retardancy in plastic injection molding for electrical engineering components places high demands on materials, standards, and processing. With the right combination of materials, regulatory requirements, and processes, safe, durable, and cost-effective solutions can be achieved.
Schröder + Heidler offers you practical expertise and innovative flame-retardant solutions. This ensures that your electrical engineering components meet the highest safety standards and remain cost-efficient.
Feel free to contact us to discuss your requirements and find the right solution.
Frequently asked questions (FAQ)
The most common classes are UL 94 V-0, V-1, and V-2. For electrical engineering components, V-0 is usually required, as this standard ensures the fastest self-extinguishing after exposure to flame.
Flame retardants can change toughness, stiffness, and heat resistance. Mineral fillers increase stiffness, while organic additives affect impact strength. Therefore, careful selection is necessary.
Key tests include the UL 94 flammability test, glow-wire tests according to IEC 60695, long-term tests for material durability, and emission tests for toxic gases.
Yes, halogen-free agents release fewer toxic gases in the event of a fire and are often more suitable for recycling. They are therefore preferable for environmental and health reasons.
The challenges include altered flow properties, increased tool wear, and potential surface issues. Adapted processes and tool design help to solve these problems.
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