Whether it’s for medical devices, kitchen appliances, automotive parts, or consumer products, custom silicone valves are indispensable in countless applications. The impact of small savings per piece can make a big difference when the volumes are high. The difficulty is finding a way to lower the silicone valve unit production price without adding risks such as leakages, performance issues or regulatory setbacks that increase the TCO.
We have enabled OEMs and brands to realize substantial cost savings by better design, tooling methods, material selection, and process improvements at Dongguan HT Silicone & Rubber Co., Ltd. It is all about intelligent optimizations and not the lowest quote. The key is focusing on intelligent optimizations rather than simply chasing the lowest quote. Working with a manufacturer that specializes in cost‑effective custom silicone valves allows you to reduce waste and tooling risk while still meeting demanding performance targets.
Start With Design – Simplify Geometry Without Sacrificing Function
The single largest opportunity to lower silicone valve manufacturing price typically starts in the drawing room. Too complicated geometries (unnecessary undercuts, ultra sharp corners, ultra thin walls etc.) increase the mold cost, cycle time and add to the scrap rate. Simplification with care, while maintaining the important sealing surfaces, cracking pressure and flow characteristics, brings a significant savings benefit.
But these opportunities can be discovered before the tooling process starts with the help of early teamwork with experienced silicone engineers. Many times, a good Design-for-Manufacturability (DFM) review will identify changes that result in 20-30% reduction in tooling costs while improving molding consistency without changing functionality.
Design-for-Manufacturability (DFM) Checkpoints That Save Money
Consider this practical design process questions when designing:
- Are there any undercuts or sharp internal corners within the part to be eliminated or softened?
- Is it realistic to have tolerances on non-critical dimensions for silicone compression or injection molding?
- Can valve families be reused if standardization of dimensions is done for multiple SKUs?
- Is there an optimum wall thickness that can be developed to simultaneously provide flexibility, fill and ease of moulding and demoulding?
These changes can lead to lower defects, faster cycle times, and fewer modes, all of which decrease the effective cost of a good part.
Align Tooling Strategy With Realistic Volumes
The choices of tools can have a significant impact on both initial capital investment and per-piece cost. Simpler single or low cavity tools may be more cost effective in total cost for lower or uncertain volumes. A large volume of parts makes the investment of multiple-cavity high precision tooling feasible and cost-effective.
Communicate to your manufacturer your realistic annual volume and program length. This enables them to recommend the correct level of cavities, steel grade and automation for your specific business case.
When to Use Pilot or Soft Tooling
If the design or product has not been proven to fit the market and satisfy regulatory requirements, it’s a great value to begin with a pilot or a soft tool. Lower cost tools that allow for geometry testing and sealing performance and material behavior testing prior to full production tooling. Modifications at this stage are much less costly than making the change at a later stage in the hardened steel production moulds.
Material Choices – Optimizing Cost While Meeting Performance and Compliance
The selection of materials will have an impact on both the cost of the raw materials and the processing behavior. The price of silicone compounds will differ depending on the type of additive, the type of filler, and the hardness of the compound. Setting a higher specification for heat resistance, chemical compatibility or medical-grade cleanliness than is actually required for the intended use is a waste of money.
It is intended to ensure that the compound is matched accurately to operating conditions such as temperature range, contact with fluids or detergents, compression set requirements and regulations (FDA, LFGB etc.).
Avoiding False Savings From Cheaper, Unverified Compounds
Validation is often not done and switching to new, often cheaper, compounds is often counterproductive due to increased failures or compliance problems. Structured material trials, including compression set, mechanical properties and real world exposure conditions, are recommended prior to approving a change for mass production. Real savings with verified optimization here, at the same time maintaining the reliability of the product.
Process Optimization – Reduce Cycle Time and Scrap
By improving manufacturing efficiency and minimizing scrap, stable, well-tuned molding processes directly reduce silicone valve manufacturing costs. Optimization of cure temperature and time, injection pressures and mold venting produce reliable demolding without defects such as flash on sealing lips, or short shots.
Targeting the Biggest Cost Leaks – Scrap and Rework
Raw material and machine time are significant factors that can make a 5% scrap rate really add up. Identify defects systematically and solve root causes by adjusting tooling, optimizing parameters or training operators, such as flash, deformation, color difference, dimensional variation, etc. One of the best ways to minimize TCO silicone valve ownership is through consistency in process control.
Quality Strategy – How Good QC Reduces Total Cost
Quality isn’t cost, it’s a cost reduction instrument. The reliability of the dimensions and performance reduces customer complaints, production line downtime and warranty claims. Smartest solution is risk based inspection: increased inspection for life critical medical valves, and effective sampling for regular consumer valves.
Clearly establish acceptance criteria, which will help you prevent parts from arriving at your facility with issues.
Standardization and Platforming Across Product Lines
A platform approach with a restricted number of proven valve sizes and geometries reduces the number of products to be developed, the investment in tools and reduces the complexity of the inventory. Do not create a new valve to fit each individual SKU – use as many families that have the majority of the common flow and pressure requirements.
Leveraging Existing Proven Designs
Check with your supplier on designs that are already validated that can be adapted instead of reinventing. This will save project time, shorten development time, lower the number of tests required and speed up time to market, and decrease the overall project costs.
Collaborating With Your Silicone Valve Manufacturer on Cost
Treat your manufacturer as a partner, not just a vendor. Communicate target prices, volumes, product positioning and minimum performance needs as early as possible. They can then suggest practical solutions – from design, tooling, material and processes – which will best meet your requirements in terms of cost and risk.
What to Ask During Cost-Down Discussions
These are the questions that can be useful in effective conversations:
- What are the characteristics of the toolings that are contributing to the most complexity and costs?
- Are there other materials or hardness that can be used that will still perform the function?
- What would be the impact of increase in annual commitments or longer program life on how pricing works per-piece?
- Which type of defects have the greatest impact on scrap and how can we address these?
Expert Summary – Building a Cost-Optimized, Reliable Valve Program
Cost reduction in the silicone valve manufacturing process is achieved through engineering choices, process improvements and good supplier relationships, not by reducing the quality of materials or inspection practices. Where possible, simplify the design, optimize tooling to match actual volumes, select the right materials, optimize molding parameters, implement smart quality controls and standardize the process across product lines, and reduce total costs while improving or even maintaining reliability.
Brands that have clear requirements and collaborate with skilled silicone manufacturers consistently deliver the optimal cost-efficient, long-lasting solutions. Looking for an improvement in your next custom silicone valve project? Our team at HT Silicone welcomes the opportunity to look at your drawings and volume estimate to see how we can make some practical savings.
