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 Consultation
15-25 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)

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
Hot Runner Mold 25-40 days Waste-free production, faster cycle times, gateless parts, multi-gate filling for large parts
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

Applications

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. Hot runner mold: 25-40 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 × Hot runner system (if applicable). 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. What is the difference between hot runner and cold runner molds?
Cold runner molds: Lower tooling cost, simpler design, produces runner waste (regrindable), slightly longer cycle time. Hot runner molds: Higher tooling cost, no runner waste, faster cycle times, gate vestige on part, better for multi-cavity and large parts. Hot runner is recommended for high-volume production (>10,000 parts) where material savings and cycle time justify the investment. We provide both systems with brands like YUDO, Synventive, and Mold-Masters.
15. 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.
16. 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.

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