LSR liquid silicone encapsulation of PBT components and PBT insert molding
FEATURES
Hard Infrastructure — Building a Foundation of Trust
Before addressing any client project, we invest in precision equipment that directly translates to part quality, consistency, and production reliability. Our equipment suite answers one fundamental client question: Can you deliver the same high quality, part after part, at scale?
1.1 Mold Machining Equipment
Five-Axis High-Speed Machining Centers — Our five-axis high-speed CNC machining centers achieve machining accuracy down to ±0.002mm on complex curved surfaces. What this means for clients: the parting lines on your finished parts will be smooth, free of flash, and require no secondary de-flashing operations. In automotive connector applications requiring sealing integrity, a smooth parting surface eliminates the risk of leakage paths—translating to approximately 15–20% reduction in post-molding labor costs.
-
Mold Description
Product Materials:
silicone
Soft rubber: LSR
Mold Material:
S136ESR
Number of Cavities:
4
Glue Feeding Method:
Hot runner
Cooling Method:
Water cooling
Molding Cycle
22.5s
- The mold manufacturing process and product material selection
Wire EDM (Slow Wire-Cut) — We deploy slow wire EDM machines capable of cutting micro features down to 0.03mm for fine holes and narrow slots. Critical for PBT insert molding where thin-wall sections are common, this capability prevents wall deformation and cracking during demolding. For medical device components requiring ±0.01mm tolerances, EDM precision ensures the fragile PBT insert geometry remains intact throughout the molding cycle.
Electrode Manufacturing & EDM Workshop — We maintain an in-house electrode processing center and EDM workshop, eliminating reliance on external suppliers. When a mold requires repair, the entire process stays within our facility. Conventional repair cycles of 5–7 days are compressed to 24-hour turnaround—directly reducing production downtime and mitigating supply chain risks.
-
Injection Molding Machine Fleet
Our injection molding machines range from 30 tons to 4,000 tons of clamping force, covering product sizes from micro-scale medical components (e.g., insulin pen seals under 1 gram) to large automotive parts exceeding several kilograms. All machines feature fully servo-electric drives, achieving repeatable positioning accuracy of ±0.1%.
The client value proposition: Whether you need 10,000 units or 10 million units, every shot mirrors the previous one. Batch-to-batch variation—a common pain point with hydraulic machines—is virtually eliminated. This directly translates to consistent dimensional stability, reduced scrap rates, and lower total landed cost per part.
1.3 Inspection and Metrology Equipment
Coordinate Measuring Machines (CMM) — Every mold shipped from Ansix Tech undergoes a full dimensional report comparing as-machined geometry to the original CAD model. Key dimensions are validated with process capability indices (Cpk) maintained at ≥1.33, ensuring that your production process is statistically capable of meeting design tolerances over long production runs.
Optical Inspection Systems — High-resolution optical imaging enables rapid verification of small or complex features not easily accessed by probe-based CMM, including sealing lip geometries and fine edge details critical to PBT-LSR interface integrity.
Section 2: Mold Manufacturing — Core Competencies Measured in Tangible Metrics
Clients ask three fundamental questions about our mold manufacturing: How long will it last? How precise is it? How fast can you deliver it and how much will repairs cost? We answer each with specific, measurable commitments.
Dimension Technical Specification Client Value
Mold Life Premium steel grades: S136/HPM38 for medical-grade molds (>100,000 cycles with hardness ≥48 HRC); P20 for general-purpose mold bases; 2344/2343/8407/SKD11/DC53/M340/4Cr13/9Cr18/NAK80/H13 for demanding applications. For glass fiber–reinforced PBT (30–40% GF), guaranteed ≥500,000 shots; for standard plastics, ≥1,000,000 shots. A high-performance mold that does not wear out mid-production means no unplanned downtime, no retooling costs, and no scrap spikes.
Achievable Tolerances ±0.05mm for standard structural components; ±0.005mm for precision gears and medical components. Design engineers can confidently specify tight tolerances without compromising manufacturability or incurring premium pricing.
Mold Types Hot runner systems (material-saving, ideal for high-volume production); stack molds (double cavity count in same machine footprint); two-shot/multi-material molds for sequential PBT+LSR injection; high-polish molds (Ra<0.05μm) for optical-grade clarity. Application-matched technology maximizes production efficiency for your specific volume and complexity requirements.
Gate & Runner Solutions Cold runner systems for LSR—preferred for their material-saving benefits and consistent shot-to-shot material condition. Mold flow analysis (MFA) predicts weld line and gas entrapment locations upfront, with gates strategically placed to ensure balanced filling across all cavities. No trial-and-error iterations. Your production line goes live faster, with fewer rejects.
Standard Lead Times Simple molds: 10 days; medium-complexity molds: 25–45 days; expedited service available for critical projects (compressed timeline with all validation steps preserved). Predictable timelines enable better production planning and faster time-to-market.
2.1 Steel Selection Rationale — Turning Material Science into Cost Savings
The choice of mold steel has profound implications for total cost of ownership. Standard P20 tool steel loses 10–15% of its hardness after approximately 5,000 thermal cycles under LSR processing conditions (injection temperature 180–220°C, injection pressure 80–150 MPa). By contrast, high-performance grades such as S136/HPM38 maintain hardness ≥48 HRC beyond 100,000 cycles.
Client impact: A medical device manufacturer requiring 100,000 units annually could face mold replacement costs of approximately $20,000 per year using standard steel. With S136 tooling, that cost is spread across 5+ years of production while maintaining tighter dimensional control (±0.015mm versus ±0.03mm drift with standard steel). The upfront investment premium (typically 40–50%) delivers 3–5× longer service life—a compelling ROI proposition for volume production.
Section 3: Injection Molding Process Control — Eliminating Quality Anxiety
Clients fear the same five problems in every project: shrinkage voids, flash, dimensional instability, color inconsistency between batches, and delamination at the LSR-PBT interface. Our process control framework systematically eliminates each.
3.1 Process Standardization — MES-Integrated Parameter Locking
Every injection molding machine is networked to our Manufacturing Execution System (MES). Critical process parameters—temperature, injection pressure, injection speed, holding pressure, and curing time—are locked at approved setpoints. Only authorized process engineers can modify settings, and all changes require documented approval.
Client value: You never worry about an operator inadvertently changing a setting between shifts. Every batch replicates the validated process signature. Quality deviations traceable to process drift are eliminated.
3.2 Dimensional Stability Control
Our molds incorporate zone-controlled mold temperature regulation systems using independent thermal control circuits for core and cavity sides. Temperature differential between core and cavity is maintained within 2°C, minimizing warpage caused by asymmetric cooling.
Real-world validation: In a PBT insert molding application with complex geometry, we demonstrated key hole spacing variations ≤0.02mm across three consecutive production batches over one week—well within typical medical/aerospace tolerance windows.
For critical applications requiring enhanced process control, we offer integration of in-cavity temperature and pressure sensors that feed real-time data to a closed-loop process control system. When a drift is detected, the system automatically compensates by adjusting injection parameters to maintain optimal filling and curing conditions.
3.3 Visual and Surface Quality Standards
Application Type Achievable Standard
Transparent LSR (no bubbles/flow marks) Full optical clarity; no visible defects
Plated/coated PBT surfaces No gas streaks, voids, or surface defects
High-gloss finished parts Surface roughness Ra ≤0.2μm
For parts requiring subsequent printing or coating, we can incorporate compensation features into the mold design to accommodate post-molding shrinkage, achieving print registration accuracy within ±0.1mm.
3.4 Special Material Processing Expertise
Our material processing portfolio includes comprehensive experience across:
Engineering thermoplastics: PC, PC/ABS, PBT (including 30–40% GF–reinforced grades), PA6+GF30, PPS+40%GF
High-performance polymers: PEEK, PEI (Ultem), LCP, PPS
Specialty elastomers: LSR liquid silicone rubber, PTFE, PFA, FKM
Flame-retardant grades: UL94 V-0 rated materials for electrical enclosures and automotive connector housings
Weatherable grades: Validated for UV exposure up to 3,000 hours without measurable color shift
3.5 Addressing the LSR-PBT Bonding Challenge
The fundamental technical challenge in LSR encapsulation of PBT components is achieving reliable adhesion between two chemically dissimilar materials—thermoset silicone and thermoplastic PBT. Poor adhesion leads to delamination, compromising sealing integrity and product reliability.
Our solution integrates multiple strategies:
Material selection: Self-bonding LSR grades (e.g., Momentive Silopren LSR 47X9 series) that achieve primerless adhesion to PBT substrates
Surface activation: Plasma treatment of PBT inserts to enhance surface energy and promote chemical bonding
Mechanical interlocking: Strategic design of undercuts, holes, and grooves in the PBT component to provide physical retention
Preheating: PBT inserts are preheated to 80–120°C before LSR injection, eliminating surface moisture and promoting interfacial crosslinking
Thermal expansion compensation: Our DFM analysis accounts for differential thermal expansion between PBT (CTE ≈ 0.000075 in./in./°C) and cured LSR, preventing internal stress separation
Section 4: Full-Service Integration — Reducing Your Management Overhead
Many suppliers focus solely on manufacturing. Ansix Tech integrates the entire product realization lifecycle, reducing the number of vendor interfaces you manage.
4.1 Early Engineering Engagement — DFM Before Commitment
Before any tooling contract is signed, our engineering team provides a comprehensive Design for Manufacturability (DFM) report that analyzes:
Draft angle recommendations (minimum 1° for LSR demolding; up to 3° for deep PBT features)
Wall thickness optimization (avoiding sudden transitions that cause sink marks and voids)
Gate and runner placement (balanced filling to prevent weld lines and trapped gas)
Ejector pin location and marking allowances (avoiding cosmetic surface damage)
Undercut and mechanical locking features (optimizing LSR-PBT interface retention)
DFM helps you select the right amount and type of silicone material, reducing waste while ensuring the part meets performance requirements. Client value: Problems that would cost thousands to fix after tooling is cut are resolved on paper, for free.
4.2 Trial Molding and Iterative Validation
We provide T0 through T3 trial samples, each accompanied by a detailed improvement report. The T0 trial validates basic filling; T1 addresses gate balance and flash; T2 refines dimensional control; T3 confirms process stability.
Rapid changeover capability: Our mold design incorporates interchangeable inserts, allowing multiple design variants to be tested on the same tool base without rebuilding the entire mold.
4.3 Pre-Production Validation
Before committing to volume production, we offer a 100- to 500-shot trial run that produces statistically valid data on yield rate and process capability (Cpk). We confirm stable performance before approving mass production—eliminating the risk of discovering process problems after 50,000 bad parts have been produced.
4.4 Maintenance and Spare Parts
Every mold is delivered with a set of critical spare components (ejector pins, core inserts, wear plates) included at no additional charge. Scheduled maintenance is performed every 200,000 cycles. For repairs beyond routine maintenance, we offer lifetime service at cost-plus pricing—no surprise repair markups.
Section 5: Competitive Differentiation — Addressing Client Pain Points Head-On
Rather than making general claims about being "better," we address specific frustrations clients commonly experience with other suppliers.
Client Complaint Ansix Tech Commitment
Molds require frequent repairs, causing production delays Every mold undergoes 2,000-shot accelerated wear testing before delivery, with a full wear report documenting expected life. Three-year structural warranty (excluding normal wear components).
Excessive flash requiring costly manual trimming Parting surface fit tolerance controlled to ±0.005mm. Self-locking clamp force compensation ensures flash thickness ≤0.03mm per batch. Manual de-flashing eliminated.
Dimensions drift batch-to-batch In-mold ultrasonic wall thickness sensors provide real-time feedback; closed-loop control adjusts holding pressure to compensate.
Long repair cycles for damaged tooling In-house electrode manufacturing and EDM center. 24-hour restoration for common repairs (patch welding, insert replacement).
Section 6: The Value Proposition Summary — What Ansix Tech Delivers to Your Business
Having detailed our technical capabilities across five domains, the question remains: What does this mean for your business? Below is a direct summary of the client value we deliver.
6.1 Design Development Value: De-Risking Before Production Begins
Problem we solve: Unforeseen manufacturability issues discovered after tooling is cut—delaying launch by weeks or months and incurring rework costs that often exceed 20–30% of the original tooling budget.
Our capability:
We provide DFM reports before any tooling commitment, analyzing draft angles, wall thickness uniformity, gate placement, ejection strategy, and LSR-PBT bonding requirements.
For LSR encapsulation specifically, our DFM review examines cold runner system configuration, venting groove depth control (0.0015–0.005mm), and parting line sealing gap tolerance (5–20μm).
We perform mold flow analysis (MFA) to predict weld line locations, gas entrapment zones, and fill imbalance across multi-cavity tools.
Client value:
Cost saved: 5,000–15,000 avoided in post-tooling modifications (typical industry costs for a medium-complexity mold)
Risk reduced: Probability of launch delay due to manufacturability issues → near zero
Lead time compressed: 4–6 weeks saved compared to discovering problems after steel is cut
6.2 Quality Validation Value: Rigorous, Data-Driven, and Traceable
Problem we solve: Inconsistent quality across production batches leads to field failures, customer returns, and reputational damage. Many suppliers lack robust validation infrastructure.
Our capability:
Each mold undergoes full dimensional inspection on CMM with key dimension Cpk ≥1.33 before shipment
T0–T3 trial samples with iterative improvement reports
Pre-production validation runs (100–500 shots) with statistical yield and Cpk reporting
MES-integrated process monitoring with real-time parameter logging and traceability
Every batch of LSR material undergoes incoming inspection: viscosity variation ≤5%, curing agent ratio tolerance ≤0.1%
For medical applications, validation includes ISO 10993 biocompatibility, sterilization resistance (autoclave/gamma/EtO), and USP Class VI compliance
Client value:
Cost saved: Field failure rates reduced from typical 2–5% to <0.5% → 50,000–200,000 annual savings for volume production (calculated as (failure rate reduction) × (annual volume) × (cost per field failure))
Risk reduced: Complete traceability from raw material certificate to finished part → audit-ready for ISO 13485, IATF 16949, and FDA 21 CFR Part 11 requirements
Time saved: Validation data provided upfront eliminates client's in-house qualification testing delays
6.3 Material Optimization Value: Strategic Selection for Performance and Cost
Problem we solve: Over-specified materials increase cost unnecessarily; under-specified materials cause performance failures. The interface between LSR and PBT is particularly sensitive—wrong material combinations lead to delamination, the most critical failure mode in overmolded parts.
Our capability:
PBT selection: We work with 30% GF–reinforced grades (e.g., PBT GF30) for enhanced rigidity and dimensional stability; standard unreinforced PBT for cost-sensitive applications; flame-retardant V-0 grades for electrical enclosures. PBT shrinkage rate is typically 1.5–2.0%—our tooling compensates precisely for this.
LSR selection: We select from platinum-cured, two-part LSR systems (Part A base polymer + Part B curing agent mixed 1:1). Medical grades meet FDA/USP Class VI/ISO 10993; high-tear-strength grades for sealing applications; self-bonding grades that achieve primerless adhesion to PBT.
Material qualification: Each material batch is tested for hardness, tensile strength, thermal stability (–50°C to +200°C operational range), and chemical resistance before production release.
Client value:
Cost saved: Eliminating unnecessary primers/surface treatments saves
0.05–0.15 per part in material and process costs. For 1,000,000 parts annually, that is 50,000–150,000.
Risk reduced: Primerless LSR grades (e.g., Momentive Silopren LSR 47X9 series) eliminate adhesion-related delamination risk—the #1 cause of field failures in overmolded components.
Performance optimized: Correct material selection extends product life in thermal cycling applications (automotive engine compartments, medical sterilization cycles)
6.4 Process Optimization Value: Efficiency That Lowers Per-Part Cost
Problem we solve: Long cycle times and high scrap rates drive up per-part cost, eroding your margin and making your product less competitive.
Our capability:
Cold runner systems are our standard for LSR processing. Unlike hot runners where material remains heated continuously, cold runner systems maintain uncured LSR at cool temperatures all the way to the gate, preventing premature vulcanization and allowing the runner material to be reused or discarded. The result is nearly zero material waste from runner scrap—critical given that LSR is a relatively expensive raw material.
Conformal heating/cooling channels accelerate curing rates. Research demonstrates that strategically designed heating channels can reduce solidification time by approximately 28%. Our mold designs incorporate similar conformal channel technology where part geometry permits.
Multi-cavity tools multiply output per machine cycle without proportional increases in labor or energy costs.
Automated part handling reduces labor content and eliminates manual handling defects.
Client value (case study example):
Baseline before optimization: 60-second cycle time, 85% yield → 51 good parts/hour
After Ansix process optimization: 40-second cycle time, 97% yield → 87 good parts/hour
Cost impact: 70% productivity increase + 12 percentage point yield improvement → 30–40% reduction in per-part manufacturing cost
6.5 Production Capacity and Delivery Value: Predictable, Scalable, On-Time
Problem we solve: Unreliable suppliers miss delivery commitments, forcing you to carry excess safety stock (tying up working capital) or face production line stoppages (costing thousands per hour of downtime).
Our capability:
Machine capacity: 30-ton to 4,000-ton fleet with redundant capacity for key projects
Tooling capacity: In-house mold manufacturing (no subcontractor delays) with 24-hour emergency repair capability
Supply chain integration: JIT delivery scheduling coordinated with your production plan
Volume scalability: Prototype (10–100 units) → pilot run (100–500 units) → low-volume (1,000–10,000/month) → high-volume (>100,000/month) with seamless transitions
Client value:
Cost saved: Reduced safety stock inventory → 15–25% reduction in working capital tied to raw material and finished goods inventory
Risk reduced: On-time delivery rate >98% eliminates line-stop risk. Typical automotive line-stop cost: 5,000–20,000 per hour.
Lead time compressed: Expedited mold manufacturing (standard 25–45 days compressed to 20 days for critical projects)
6.6 Comprehensive Cost Savings Summary
Cost Category Annual Savings (1M parts) Source of Saving
Material cost 50,000–150,000 Primerless LSR grades; reduced scrap from cold runner systems
Labor cost 30,000–80,000 Eliminated manual de-flashing; automated part handling
Tooling amortization 10,000–20,000 Extended mold life (100k+ cycles vs. industry average 50k)
Quality/field failure 50,000–200,000 Reduced scrap; lower warranty claims
Inventory carrying cost 15–25% reduction Reliable JIT delivery
TOTAL ANNUAL SAVINGS 140,000–450,000 Per 1 million parts produced
Conclusion
At Ansix Tech, we do not view a mold as simply a block of steel. We view it as your revenue-generating asset—designed from the ground up for thermal balance, venting efficiency, and production robustness. Every design decision is made with your production line in mind, ensuring that when the mold arrives at your facility, it runs tooling-free, with minimal flash, maximum uptime, and predictable quality.
We invite you to review a product of your choice through our full DFM process. You will see firsthand how we anticipate and resolve weld lines, gas entrapment, shrinkage, and adhesion risks—before a single gram of material is ever molded.
Ansix Tech Co Ltd
If you have any plans related to LSR liquid silicone encapsulation of PBT components and PBT insert molding , you can contact us at any time. We will turn your ideas into reality, let you realize your dreams, and obtain large orders from the market. Our contact information is info@ansixtech.com. Or contact our CTO, mail: stephen@ansixtech.com
#www.ansixtech.com #ansixtech.com #LSR liquid silicone encapsulation of PBT components and PBT insert molding #LSR Liquid Silicone Cap injection molding companies #LSR Liquid Silicone Cap Canopy Mold injection mold companies #Ansix #Ansix moulds #Ansix china #Ansix tech china #Ansix tech company #Ansix facotry #LSR Liquid Silicone Cap injection molding #LSR Liquid Silicone Cap injection tools #LSR Liquid Silicone Cap injection moulds #LSR Liquid Silicone Cap plastic mould #LSR Liquid Silicone Cap plastic tools #Ansix Tech #Ansix molds #Ansix injection molding #Ansix mold factory #injection molding LSR Liquid Silicone Cap#Ansix mold factory #LSR Liquid Silicone Cap china #LSR Liquid Silicone Cap molds #injection factory #LSR Liquid Silicone Cap injection molding #LSR Liquid Silicone Cap injection molding factory #injection molding company #LSR Liquid Silicone Cap injection mold companies #LSR Liquid Silicone Cap Tooling #LSR Liquid Silicone Cap mold limited #Ansix mold china #Ansix companies #Ansix company China #LSR Liquid Silicone Cap facotry #Ansix Tech #Ansix Tech mould #LSR Liquid Silicone Cap injection moulding #injection moulding company #Ansix LSR Liquid Silicone Cap parts injection mold companies #medical injection molding companieschina #LSR Liquid Silicone Cap china factory #Ansix moulding companies #Ansix molding company #LSR Liquid Silicone Cap injection moulding facotry #Ansix Tech mold #LSR Liquid Silicone Cap mould #LSR Liquid Silicone Cap plastic injection molding #ansix plastic mold #Mold manufacturing #LSR Liquid Silicone Cap parts manufacturing #LSR Liquid Silicone Cap plastic parts factory #LSR Liquid Silicone Cap injection parts mold #LSR Liquid Silicone Cap PRECISION MANUFACTURING #LSR Liquid Silicone Cap #China mold #LSR Liquid Silicone Cap injection moulding china #LSR Liquid Silicone Cap mould china #china precision mold #mold in china #LSR Liquid Silicone Cap mold china #Precision molds #High-precision molds #LSR Liquid Silicone Cap #Injection molds #LSR Liquid Silicone Cap Factory #LSR Liquid Silicone Cap Company #Super Large Injection Mold Factory #Large Tonnage Injection Molding Factory #LSR Liquid Silicone Cap Company #LSR Liquid Silicone Cap Factory #2800T Injection Molding Factory #3000 Ton Injection Molding #4500 Ton Injection Molding Factory #Large Mold Injection Molding #Large Plastic Mold Injection Molding Factory #Large Injection Mold Manufacturer #Plastic Mold Factory #Injection Mold #Plastic Mold