Custom Silicone Manufacturing FAQ
Technical answers to the most common questions from OEM engineers and rocurement managers — covering DFM review, quality compliance, tooling ownership, lead times, and IP protection.
Engineering · Quality · Tooling Risk · Cost & MOQ · Lead Times · Logistics · IP Protection
1. Can you manufacture my part?
Engineering Validation
Q1: Can you produce my custom silicone part from drawings or samples?
A: Yes. We support production based on 2D drawings, 3D STEP files, or physical samples. Our engineering team performs a DFM (Design for Manufacturability) review before quotation — identifying any geometry risks, tooling concerns, or material selection issues before any investment is made. We do not provide product design services from concept stage.
Q2: Do you provide DFM (Design for Manufacturability) analysis?
A: Yes. Our DFM review covers gate location feasibility, venting strategy, parting line positioning, draft angle analysis, wall thickness review, flash risk identification, and material grade selection. Findings are delivered in a written report within 24 hours of receiving your STEP file, under strict Mutual NDA.
DFM at the design stage costs nothing to fix. The same issues identified after tooling completion cost 10–100x more to correct.
Q3: What types of silicone processes do you support?
A: We support four core silicone manufacturing processes:
- LSR Injection Molding: Automated flash-free production for medical, optical, and precision sealing components. Best for high-volume programs above 50,000 pieces annually.
- HCR Compression Molding: Cost-efficient compression molding for large-format seals and gaskets up to 500mm × 500mm. Supports flame retardant and conductive compound grades.
- Silicone Overmolding: Permanent LSR bonding onto stainless steel, aluminum, PC, PBT, and PEEK for waterproof assemblies and ergonomic interfaces.
- Rapid Prototyping: Functional T1 samples in 7–14 business days using real LSR or HCR materials — not 3D printed approximations.
Q4: Do you support multi-material overmolding onto metal or plastic?
A: Yes. We specialize in bonding medical-grade LSR onto stainless steel, aluminum, PC, PBT, PEEK, and PPSU. Bonding strategy — including surface preparation method, primer selection, and shrinkage compensation — is evaluated during DFM review to prevent delamination before tooling investment begins.
2. Can I trust your quality?
Quality & Compliance
Q1: What quality standards does your facility follow?
A: Our quality management system is ISO 13485:2016 certified — the international standard specifically designed for medical device manufacturing. This covers design review, risk management, production control, inspection, and post-market traceability. For dimensional tolerances, we follow ISO 3302-1 Class M1 and M2 standards for all precision silicone components.
Q2: What material compliance certifications do you support?
A: Material compliance depends on your application and target market. We source from Wacker, Dow, Shin-Etsu, and Elkem — and can provide:
- FDA 21 CFR 177.2600 (US food and medical contact)
- ISO 10993 / USP Class VI (medical biocompatibility)
- LFGB §30/31 (EU food contact)
- REACH and RoHS (EU market)
- EU Regulation 10/2011 (EU food contact plastics)
Material COA and compliance certificates are provided with every production batch.
Q3: How do you ensure production quality consistency?
A: Quality is controlled at three stages:
- IQC (Incoming Quality Control): Every material batch verified against supplier COA before production.
- IPQC (In-Process Quality Control): Closed-loop injection parameters monitored per shot. IRHD hardness testing at defined production intervals.
- FQC (Final Quality Control): 100% Automated Optical Inspection (AOI) with CCD vision systems for critical medical components — verifying every single part for dimensional compliance and surface defects. Zero sampling on critical programs.
Every batch ships with a full OQC report including dimensional data, hardness results, and material lot reference.
Q4: Can I audit your factory or request compliance documents?
A: Yes. We support customer audits and third-party inspections at any time. Full QMS documentation including ISO 13485 certificate, production procedures, and inspection records is available upon request under NDA.
For remote supplier qualification, we can provide a comprehensive documentation package covering quality manual, process control plans, FMEA records, and material compliance certificates.
3. What are the risks in tooling and production?
Risk Control
Q1: Who owns the mold after payment?
A: The client owns the tooling design, intellectual property, and the right to the physical mold. The physical mold is stored and maintained at our facility to ensure production stability and consistent part quality across all runs.
Tool ownership transfer and export to customer facilities are vailable under documented mutual agreement.
Q2: Can molds be modified or transferred?
A: Mold modifications are possible depending on geometry and steel condition. Simple modifications such as cavity adjustments or gate relocation are evaluated on a case-by-case basis with
a written feasibility assessment.
Mold transfer to another facility can be arranged under mutual agreement. We provide full mold documentation including cavity drawings, BOM, and maintenance records for any transfer.
Q3: What happens if a mold wears out or needs repair?
A: We perform preventive maintenance at defined production milestones — typically every 50,000 shots for standard programs. For S136 stainless steel tooling, we guarantee a minimum tool life of 300,000+ shots under standard production conditions.
S136 stainless steel has a tool life approximately 3–5x longer than standard P20 steel — directly lowering the amortized tooling cost per unit for high-volume programs.
If repair is required beyond normal maintenance, we provide a written assessment with cost and timeline before any work begins.
Q4: How do you ensure long-term part consistency?
A: Part consistency over production life is maintained through three mechanisms:
- Tooling quality: S136 premium steel with documented cavity dimension verification before first production run.
- Process locking: Production parameters are locked after T1 approval. Any parameter change requires formal ECO approval.
- Batch traceability: Every batch links production parameters, material lot, and inspection results — enabling rapid identification of any deviation source.
Q5: How do you prevent contamination in medical-grade production?
A: All medical-grade molding and packaging operations take place in our dedicated Class 100,000 (ISO Class 8) cleanrooms. Real-time particle counting monitors air quality continuously. Operators follow full gowning protocols.
Flash-free cold runner technology eliminates the need for secondary trimming operations that could introduce contamination.
4. What are the cost and MOQ expectations?
Commercial Reality
Q1: What is your minimum order quantity (MOQ)?
A: There is no fixed MOQ. We support projects from single-cavity prototype tooling for early-stage validation through to multi-million piece annual production programs.
Volume requirements are evaluated during the DFM review based on your development stage, tooling investment, and production roadmap. There is no minimum commitment required
to begin an engineering conversation.
Q2: Is tooling cost refundable?
A: Tooling is a one-time engineering investment that covers design, CNC machining, and first-article validation. Once machining begins, tooling costs are non-refundable.
In selected long-term programs, tooling costs can be amortized into unit pricing — effectively crediting the tooling investment back over an agreed production volume commitment. This arrangement is discussed during the commercial negotiation stage.
Q3: Do you support small-batch production for validation or market testing?
A: Yes. Our aluminum soft tooling supports pilot runs of 50–500 pieces — suitable for clinical trials, regulatory sample submissions, market testing, and early commercial deliveries.
Bridge production from prototype tooling prevents market launch delays while production tooling is being manufactured.
5. How fast can you deliver?
Time & Delivery Risk
Q1: How long does the DFM review take?
A: Written DFM feedback is delivered within 24 hours of receiving your STEP or 2D drawing file — under strict Mutual NDA before any proprietary files are opened.
For complex multi-cavity or overmolding programs, a more detailed DFM report may require 48 hours.
Q2: What is the lead time for prototype samples?
A: Lead time depends on the tooling method:
- LSR Prototype Tooling: T1 samples in 10–14 business days from DFM-approved drawing.
- Aluminum Soft Tooling: T1 samples in 7–10 business days. Suitable for pilot runs up to 500 pieces.
- 3D Printed Silicone: Geometry validation samples in 3–5 business days. Not suitable for functional mechanical testing.
All lead times begin after drawing submission, DFM approval, and NDA execution. A completed 2D or 3D design file is required to begin the DFM review process.
Q3: What is the lead time for mass production?
A: Mass production typically begins 2–4 weeks after T1 sample approval and deposit confirmation. Lead time varies by order volume, component complexity, and production line scheduling.
Q4: What factors can affect lead time?
A: The most common lead time factors are:
- Design changes after DFM approval (restart tooling timeline)
- Delayed sample approval feedback
- Material procurement for specialty grades
- Customer-supplied insert availability for overmolding programs
- Peak production scheduling periods
We communicate any lead time impact immediately and provide revised delivery commitments in writing before proceeding.
6. How do logistics and shipping work?
Delivery Execution
Q1: What shipping methods do you offer?
A: We support three shipping modes:
- Express Courier (DHL, FedEx, UPS): 3–5 business days to most destinations. Best for prototype samples and urgent orders.
- Air Freight: 5–10 business days. Cost-effective for medium volumes.
- Sea Freight (FCL/LCL): 20–35 days depending on destination. Most economical for high-volume production orders.
Shipping method recommendation is provided at quotation stage based on your timeline and order volume.
Q2: What Incoterms do you support?
A: We support EXW, FOB, CIF, and DDP (for selected regions with door-to-door delivery).
For first-time customers, we usually recommend FOB Guangzhou, as it allows you to choose and control your freight forwarder and manage customs clearance, while we take care of export documentation and loading.
Q3: How are medical-grade silicone components packaged for shipping?
A: Medical-grade and cleanroom-produced components are double-packaged within our Class 100,000 cleanroom before shipment — inner PE bag sealed, outer labeled carton with batch number and inspection report inside.
Packaging specifications (ESD bags, moisture barrier bags, specific labeling requirements) can be customized to your incoming goods inspection requirements.
Q4: Who handles customs duties and import taxes?
A: Under FOB and EXW terms, import duties and customs clearance at the destination country are the buyer’s responsibility.
Under DDP terms (available for selected regions), we handle all customs formalities and delivery to your specified address — duties and taxes included in the quoted price.
We provide complete export documentation including commercial invoice, packing list, certificate of origin, and material compliance certificates to support smooth customs clearance.
7. How do you protect my design and IP?
Trust & Confidentiality
Q1: Do you sign NDA agreements before reviewing files?
A: Yes, without exception. We sign a Mutual Non-Disclosure Agreement (NDA) before opening any CAD files, technical drawings, or proprietary product specifications.
NDA execution typically takes less than 24 hours. We can use our standard NDA template or accept your company’s NDA format. No files are reviewed until NDA is fully executed.
Q2: How is my design data protected internally?
A: Customer design files are stored in restricted-access internal servers — not accessible to unauthorized personnel. Files are used exclusively for the manufacturing program they were shared for.
We do not share, reproduce, or use customer designs for any purpose outside the documented manufacturing program. All staff involved in customer programs are bound by confidentiality obligations.
Q3: Have you worked with customers who require strict IP confidentiality, such as medical device companies?
A: Yes. The majority of our medical and industrial OEM customers require strict NDA protocols before any technical discussion. This is standard practice for us — not an exception.
We have supported customers from concept DFM through to high-volume production without disclosing program details, customer identities, or product specifications to any third party.
The case studies on our website use anonymized industry descriptions (e.g., “Global Tier-1 Medical OEM”) specifically to protect customer confidentiality.
Didn’t find your answer?
Our engineering team is available to answer specific technical questions about your project. Send us your drawing or describe your application — we respond within 24 hours under Mutual NDA, at no charge.