Precision Injection Molding Services
High-quality plastic injection molding solutions from prototype to mass production. Wide material selection including ABS, PC, PA/nylon, POM, PP, PMMA, TPU with precision tolerances and competitive China manufacturing costs.
Free Consultation15-25 Days
Tooling Lead Time
±0.02mm
Tolerance Accuracy
300K+ Shots
Tool Life
0.5g - 3kg
Part Weight
Materials
| Grade | Properties | Typical Applications |
|---|---|---|
| ABS (Acrylonitrile Butadiene Styrene) | Tensile Strength: 40-50 MPa, Density: 1.05 g/cm³, Heat Deflection Temp: 95-105°C, excellent impact resistance and surface finish | Consumer electronics housings, automotive interior parts, toys, appliance housings, enclosures |
| PC (Polycarbonate) | Tensile Strength: 55-75 MPa, Density: 1.20 g/cm³, Heat Deflection Temp: 130-140°C, outstanding impact strength and optical clarity | Lighting fixtures, medical devices, safety equipment, electronic displays, automotive lenses |
| PA/Nylon (Polyamide) | Tensile Strength: 60-85 MPa, Density: 1.13-1.15 g/cm³, Heat Deflection Temp: 60-200°C, excellent wear resistance and self-lubrication | Gears, bearings, cable ties, automotive under-hood parts, industrial components |
| POM (Polyoxymethylene / Delrin) | Tensile Strength: 60-70 MPa, Density: 1.41 g/cm³, Heat Deflection Temp: 110-130°C, excellent dimensional stability and low friction | Precision gears, bearings, clips, springs, valve components, conveyor parts |
| PP (Polypropylene) | Tensile Strength: 25-40 MPa, Density: 0.90 g/cm³, Heat Deflection Temp: 90-110°C, excellent chemical resistance and low cost | Packaging containers, automotive bumpers, household items, medical disposables, living hinges |
| PE (Polyethylene) | Tensile Strength: 20-30 MPa, Density: 0.91-0.96 g/cm³, excellent chemical resistance and moisture barrier, FDA compliant grades available | Bottles, caps, containers, medical devices, toys, food packaging |
| PMMA (Acrylic) | Tensile Strength: 55-75 MPa, Density: 1.18 g/cm³, 92% light transmittance, UV resistant, excellent optical clarity | Lighting diffusers, display panels, optical lenses, signage, automotive tail lights |
| TPU (Thermoplastic Polyurethane) | Tensile Strength: 25-60 MPa, Density: 1.10-1.25 g/cm³, Shore Hardness: 60A-75D, excellent elasticity and abrasion resistance | Phone cases, cable sheathing, shoe soles, medical tubing, seals and gaskets |
| PA66+GF (Glass-Filled Nylon) | Tensile Strength: 120-185 MPa (depending on GF content), Density: 1.30-1.50 g/cm³, Heat Deflection Temp: 250°C, superior rigidity | Structural automotive parts, electrical connectors, high-load mechanical components |
| PBT (Polybutylene Terephthalate) | Tensile Strength: 50-60 MPa, Density: 1.31 g/cm³, Heat Deflection Temp: 150-220°C, excellent electrical insulation | Electrical connectors, relay housings, switch components, automotive sensor housings |
Process Parameters
| Parameter | Standard Range |
|---|---|
| Dimensional Tolerance (Precision) | ±0.02mm to ±0.05mm (tight tolerance molding) |
| Dimensional Tolerance (Standard) | ±0.05mm to ±0.15mm (general applications) |
| Wall Thickness | 0.5mm - 5.0mm (optimal: 1.0mm - 3.0mm, material dependent) |
| Draft Angle | 0.5° - 3.0° (recommended: minimum 1.0° for textured surfaces) |
| Part Weight Range | 0.5g - 3,000g (micro to medium-sized parts) |
| Surface Roughness (As-molded) | Ra 0.2μm - 1.6μm (depends on mold surface finish) |
| Tool Life | 300,000 - 1,000,000+ shots (depending on material and mold steel) |
| Injection Pressure | 70 - 200 MPa (depending on material viscosity and part geometry) |
| Mold Temperature | 20°C - 160°C (material dependent) |
| Cycle Time | 10 - 60 seconds (depending on wall thickness and complexity) |
Surface Finishes
SPI A-1 (Mirror Polish)
Diamond buff polishing for mirror-like finish. Achieves Ra 0.012μm. Used for optical parts, lenses, and high-gloss cosmetic surfaces.
SPI A-2/A-3 (High Polish)
Fine buff polishing. Achieves Ra 0.025-0.05μm. Suitable for consumer electronics and premium product housings.
SPI B-1/B-2 (Semi-Gloss)
Stone and sandpaper polishing. Achieves Ra 0.05-0.35μm. General purpose finish for functional and visible surfaces.
SPI C-1/C-2/C-3 (Matte)
Fine to coarse stone finishing. Achieves Ra 0.35-1.6μm. Hides fingerprints and minor defects. Popular for handheld devices.
SPI D-1/D-2/D-3 (Textured)
Sandblasting for textured matte surface. Achieves Ra 1.6-12.5μm. Provides anti-slip properties and hides flow marks.
Chemical Etching / Texture
Custom texture patterns (leather grain, wood grain, geometric patterns) applied via chemical etching. Depth: 0.02-0.15mm.
Painting (Wet Paint / UV Paint)
Automotive-grade wet paint or UV-curable paint. Custom color matching (Pantone/RAL), matte/gloss/soft-touch finishes available.
Vacuum Metallization / PVD
Physical Vapor Deposition for metallic appearance (chrome, gold, titanium). Excellent adhesion on ABS and PC substrates.
Hot Stamping / Foil Transfer
Metallic or holographic foil applied via heat transfer. Ideal for logos, decorative accents, and premium branding elements.
Pad Printing / Silk Screening
Multi-color printing on curved and flat surfaces. Used for logos, labels, instructions, and decorative graphics.
Design for Manufacturing (DFM)
- Design uniform wall thickness (variation within ±25%) to prevent sink marks, warpage, and internal stresses
- Maintain minimum 1.0°-1.5° draft angle on all vertical surfaces; 0.5° additional draft for textured surfaces
- Avoid sharp corners: design minimum 0.5mm fillet radii on interior corners and 0.25mm on exterior corners
- Design ribs at 50-60% of adjacent wall thickness to prevent sink marks on the opposite surface
- Place gates at the thickest wall section to ensure proper filling and packing pressure
- Position ejector pins on non-cosmetic surfaces or along structural features (ribs, bosses)
- Avoid undercuts where possible; use side-actions, lifters, or bump-off features for necessary undercuts
- Design bosses with 60% of the nominal wall thickness at the base, with adequate draft and fillet radius
- Consider knit line locations for multi-gated parts to avoid high-stress or cosmetic areas
- Use mold flow analysis to optimize gate location, filling pattern, and cooling time before tooling
Tooling & Capacity
| Type | Lead Time | Suitable For |
|---|---|---|
| Prototype Tooling (P20/718 Steel) | 10-15 days | Prototype validation (100-5,000 parts), design verification, market testing, bridge production |
| Production Tooling (H13/S136 Steel) | 20-35 days | Mass production (100,000+ parts), long-term projects, high-volume manufacturing with tool life 500K+ shots |
| Multi-cavity Mold (2-16 cavities) | 30-50 days | High-volume production, unit cost optimization, increased throughput, uniform cavity filling |
| Insert Molding / Overmolding Mold | 25-40 days | Metal-plastic assemblies, multi-material parts, soft-touch overmolding, threaded inserts |
| Two-Shot / 2K Mold | 35-50 days | Multi-material parts (hard+soft), bi-color components, reduced assembly, enhanced ergonomics |
Quality Assurance
- First Article Inspection (FAI): Complete dimensional report for all critical features before mass production
- CMM (Coordinate Measuring Machine) inspection for critical dimensions with Cpk ≥ 1.33 capability
- Incoming material inspection: Melt flow index testing, moisture content check, color verification
- In-process inspection: Automated visual inspection, cavity pressure monitoring, weight checks per shot cycle
- Surface quality inspection: Gloss meter measurement, texture depth verification, color matching (Delta E ≤ 1.0)
- Functional testing: Assembly fit testing, pull/push force testing, leak testing for sealed parts
- Environmental testing: UV exposure, thermal cycling, chemical resistance per customer specifications
- Final inspection with AQL sampling, full inspection report with photos shipped with goods
- SPC (Statistical Process Control) monitoring for critical dimensions during production
- Full traceability from raw material batch to finished parts with serialization
Applications
- Consumer electronics: smartphone cases, laptop housings, earphone shells, remote controls, chargers, smart home devices
- Automotive: interior trim, dashboard components, air vents, headlight housings, sensor housings, connectors
- Medical devices: surgical instrument housings, diagnostic equipment parts, drug delivery devices, disposable syringes
- Home appliances: washing machine parts, vacuum cleaner components, coffee machine parts, air purifier housings
- Industrial equipment: pneumatic fittings, valve bodies, sensor housings, cable management, conveyor components
- Packaging: cosmetic containers, food-grade packaging, bottle caps, dispensing pumps, closures
- Toys and hobby: action figures, building blocks, model kits, educational toys, drone components
- Lighting: LED housings, light diffusers, lamp shades, reflectors, connector blocks
Why Choose FHY Precision
High precision: Consistent dimensional accuracy ±0.02mm across large production volumes
Wide material selection: 30+ engineering thermoplastics with various properties to meet specific requirements
Complex geometry: Capable of producing intricate shapes, thin walls, and fine details impossible with other processes
Rapid production: Short cycle times (10-60 seconds) enable high-volume output at competitive costs
Excellent repeatability: Identical parts shot after shot with consistent quality and dimensions
Low unit cost: High-volume production significantly reduces per-part cost, ideal for quantities from 500 to millions
Insert molding capability: Integrate metal inserts, threads, and multi-material features in a single process
Overmolding capability: Combine hard and soft materials for ergonomic grips, seals, and vibration dampening
Mold flow analysis: Simulate filling, packing, and cooling before tooling to optimize part design and reduce defects
China manufacturing advantage: Competitive pricing with full quality control, DFM review, and 24h technical support
FAQ
1. What is the minimum order quantity (MOQ) for injection molding?
Our injection molding MOQ starts from 500 pieces for prototype tooling, suitable for design verification and market testing. For production tooling, MOQ typically starts from 1,000 pieces to optimize cost-effectiveness. We accommodate flexible production volumes from prototype quantities to multi-million unit mass production orders. Low MOQ helps you validate designs and test markets before committing to large-volume production.
2. What is the typical lead time for injection molding tooling and production?
Prototype tooling (P20/718 steel): 10-15 days. Production tooling (H13/S136 steel): 20-35 days. Multi-cavity mold: 30-50 days. First production samples typically ship within 3-5 days after tooling completion. All lead times include our free DFM review, completed within 24 hours of receiving your CAD files.
3. Can you sign a Non-Disclosure Agreement (NDA) before sharing design files?
Absolutely. We offer NDA signing before quotation, not just before production. Your CAD files, product specifications, and business information are treated as confidential assets. We have extensive experience serving clients in aerospace, medical devices, defense, and consumer electronics—IP protection is our standard practice.
4. What is DFM analysis? Do you provide free DFM?
DFM (Design for Manufacturability) is a free engineering review service we provide, completed within 24 hours after receiving your CAD files. Our engineers analyze wall thickness uniformity, draft angles, gate locations, undercuts, potential sink marks, and warpage issues before quotation. This ensures your design is optimized for injection molding before tooling investment, reducing modification costs and accelerating time to market.
5. How is pricing calculated? What factors affect tooling and part costs?
Part price = Material cost + Processing cost + Surface finishing + Volume discount. Tooling price = Mold complexity × Cavity count × Steel grade. Factors affecting cost include: part size and weight, material selection, surface finish requirements, tolerance specifications, and order quantity. We provide detailed quotations within 24 hours. For a rough estimate, send your product description and target quantities.
6. What CAD/CAM file formats do you accept?
We accept: STEP (.stp/.step), IGES (.igs), STL, DXF, DWG, Parasolid (.x_t), SolidWorks, Pro/E (Creo), and PDF drawings. For injection molding, STEP files with 3D solid models are preferred. If you only have 2D drawings or physical samples, we can provide reverse engineering services to create 3D models.
7. Can I get prototypes/samples before mass production?
Yes. Our prototype tooling service delivers 100-5,000 prototype parts within 2-3 weeks at a fraction of production tooling cost. We also offer 3D printing (SLA/SLS) for rapid prototype validation before tooling. All prototypes include dimensional verification reports upon request, helping you validate fit, form, and function before committing to production tooling.
8. What tolerance precision can you achieve for injection molded parts?
Our standard tolerance is ±0.05mm. For precision parts, we consistently achieve ±0.02mm on critical dimensions. Tolerance depends on material selection, part geometry, and wall thickness. Semi-crystalline materials (PA, POM) typically achieve tighter tolerances than amorphous materials (PC, ABS). We provide detailed tolerance analysis in our DFM report.
9. What injection molding materials do you work with?
We process 30+ engineering thermoplastics including: ABS, PC, PA6/PA66 (nylon), POM (Delrin), PP, PE (HDPE/LDPE), PMMA, TPU, PBT, PPS, PEI (Ultem), PEEK, LCP, ASA, PC/ABS blend, PA+GF (glass-filled nylon). We also process commodity resins and specialty materials. Material selection guidance is included in our free DFM service.
10. Do you provide international shipping? How is export packaging handled?
We ship globally via DHL, FedEx, UPS, and ocean/air freight. Export packaging includes: PE bag + bubble wrap + corrugated carton + wooden pallet (for bulk orders). Each shipment includes packing list, Certificate of Origin (COO), commercial invoice, and material test reports. Typical transit time: 3-7 days by express, 3-5 weeks by ocean freight.
11. What surface finishing options are available for injection molded parts?
We offer: SPI standard polish (A-1 to D-3), custom chemical etching/texturing (leather grain, wood grain, geometric patterns), painting (wet paint, UV paint, soft-touch coating), vacuum metallization/PVD, hot stamping/foil transfer, pad printing, silk screening, laser engraving, and in-mold labeling (IML/IMD). Surface finish selection is guided by our DFM team.
12. Can you provide overmolding and insert molding services?
Yes. We specialize in overmolding (molding a soft material over a rigid substrate for ergonomic grips, seals, and soft-touch surfaces) and insert molding (embedding metal inserts, threaded bushings, or electronic components into plastic parts). These processes reduce assembly steps, improve part strength, and enhance product quality. Multi-shot (2K) molding is also available for complex multi-material parts.
13. Do you provide mold flow analysis before tooling?
Yes, mold flow analysis is included in our DFM service at no additional charge. We simulate filling pattern, packing pressure, cooling time, weld line locations, air trap positions, and warpage prediction using MoldFlow/Moldex3D software. This analysis helps optimize gate location, runner system, cooling circuit, and part design before cutting steel, reducing costly mold modifications.
14. How do you ensure consistent part quality in production?
Our quality system includes: Incoming material inspection with melt flow verification, cavity pressure monitoring during molding, automated visual inspection, weight checks per shot cycle, and CMM dimensional verification for critical features. We implement SPC monitoring for key dimensions and maintain full traceability from material batch to finished parts. First article approval is required before mass production, and AQL sampling is used for final inspection.
15. What common injection molding defects should I watch for?
Our DFM review addresses these issues before production: Sink marks → Uneven wall thickness or thick sections. FHY solution: Uniform wall design (±25% variation). Warpage → Differential cooling or fiber orientation. FHY solution: Optimize gate location and cooling circuit. Weld lines → Flow fronts meeting at cosmetic surfaces. FHY solution: Relocate gate or adjust flow balance. Short shots → Insufficient filling pressure. FHY solution: Increase gate size or add vents. Flash → Excessive clamp tonnage or worn parting line. FHY solution: Maintain mold and verify clamp force. Burn marks → Trapped air in deep ribs. FHY solution: Add venting or reduce injection speed.
16. What is the difference between hot runner and cold runner molds?
Cold runner molds: lower mold cost, simpler design, runner waste is generated (recyclable). Hot runner molds: higher mold cost, no waste, shorter cycle time. Hot runner is recommended for high-volume production (>10,000 pieces). We provide YUDO, Synventive, and Mold-Masters systems.