Custom plastic parts for washing machines serve as core functional and structural components, directly influencing equipment durability, reliability, and user experience. By precisely matching material properties with the hot and humid environment, load-bearing requirements, and structural designs of washing machines, customized processing technologies establish a full-process solution from component design to mass production, meeting diverse needs for moisture resistance, impact resistance, and dimensional accuracy across different models.
Custom Washing Machine Plastic Parts

I. Core Material Properties and Application Advantages

(A) Comparison of Mainstream Material Properties

Material Type
Density (g/cm³)
Temperature Range (℃)
Core Advantages
Typical Certifications
Polypropylene (PP)
0.89–0.91
-30 to 120
Moist-heat resistance, chemical corrosion resistance, cost-effective
LFGB Food Contact Certification
Acrylonitrile Butadiene Styrene (ABS)
1.03–1.07
-20 to 80
High toughness, easy moldability, easy electroplating
UL94 V-0 Flame Retardant Certification
Polybutylene Terephthalate (PBT)
1.31–1.53
-40 to 150
Low hygroscopicity, high abrasion resistance
IEC 60243 Dielectric Strength Certification
PC/ABS Alloy
1.12–1.20
-30 to 120
Balanced high strength and temperature resistance
RoHS Environmental Certification
Glass Fiber Reinforced Polypropylene (PP+GF)
1.05–1.15
-20 to 130
High rigidity, fatigue resistance
ISO 16750-3 Chemical Resistance Test

(B) Driving Forces of Customization Requirements

1. Environmental Adaptability

  • Moist-Heat Resistance: No deformation after 500 hours in 90%RH/50℃ environment, tensile strength retention ≥80%.
  • Detergent Resistance: Swelling rate ≤1.5% after 72-hour immersion in 5% laundry liquid, no surface cracking.

2. Structural Reliability

  • Load-Bearing Capacity: Inner tub components must withstand ≥50kg dynamic load (simulating full-load washing conditions), deformation ≤1mm.
  • Assembly Precision: Positioning accuracy of clips/screw holes ±0.1mm, ensuring assembly gap with metal frames ≤0.3mm.

3. Functional Adaptability

  • Sealing Performance: Waterproof grade IPX4 for sealing components, no leakage under 20kPa pressure test.
  • Control Panel Requirements: Weather resistance (QUV-A irradiation 1000 hours, color difference ΔE ≤3), surface hardness ≥2H.

II. Analysis of Four Core Processing Technologies

(A) Injection Molding: High-Precision Structural Processing

  • Technical Advantages:
    • Enables one-step molding of complex rib structures (e.g., inner tub supports), dimensional accuracy ±0.05mm.
    • Multi-cavity mold design (8–16 cavities per mold), suitable for 50–1000g parts, production efficiency 800–2000 pieces/hour.
  • Process Parameters:
    • Injection pressure 120–180MPa, mold temperature 50–80℃, cooling time 15–25 seconds.
    • Shrinkage control: 1.2%–1.8% for PP, 0.8%–1.2% for PBT, ensuring assembly tolerance ≤0.03mm.

(B) Blow Molding: Custom Hollow Component Production

Process Type
Typical Application Scenarios
Technical Highlights
Extrusion Blow Molding
Washing machine inner tubs, balance rings
Wall thickness uniformity ≥95%, maximum diameter ≤1000mm
Injection Blow Molding
Transparent observation windows, water inlet pipes
Optical-grade precision (transmittance ≥90%), interface accuracy ±0.02mm
  • Technical Advantages:
    • Multi-layer co-extrusion combines wear-resistant (PP) and UV-resistant (PE) layers, extending service life by 40%.
    • Inner tub roundness error ≤0.5mm, ensuring drum rotation balance (vibration amplitude ≤1.5mm).

(C) Surface Treatment Technologies

  • Functional Coatings:
    • Antibacterial Treatment: Silver-ion coating (bacteriostasis rate ≥99.9%), suitable for bacteria-prone components like inner tubs and filters.
    • Detergent-Resistant Coating: Teflon coating (20–30μm thickness), surface tension ≤18mN/m, reducing foam residue.
  • Decorative Treatments:
    • Electroplating: Chrome layer thickness 8–12μm, salt spray test ≥1000 hours, enhancing control panel metallic texture.
    • Matte Treatment: Surface roughness Ra 1.6–3.2μm, fingerprint resistance (cleaning cycle extended by 50%).

(D) 3D Printing: Rapid Prototyping & Small-Batch Customization

  • Process Advantages:
    • Quickly validates irregular structures (e.g., wave-shaped inner tub walls, clip-on filters), samples delivered in 3 days.
    • Nylon 12 material strength up to 80MPa, suitable for load-bearing prototype testing.
  • Application Scenarios:
    • Custom high-end model parts (order quantity ≤300 pieces), delivery cycle reduced by 40%.
    • Reverse engineering for obsolete model parts (3D scanning modeling error ≤0.1mm).

III. Full-Process Customization Solutions

(A) Design and Material Engineering

  1. Multi-Dimensional Design Support:
    • Structural Optimization:
      • Inner tub reinforcing ribs at 8–10 ribs/100mm, reducing stress concentration via ANSYS simulation, fatigue life increased by 30%.
      • Seal ring lip angle designed at 45°±5°, ensuring dynamic sealing pressure ≥5kPa.
    • Functional Customization:
      • Self-cleaning inner tub: 0.5mm-depth  flow channels on inner wall, reducing foam residue by 60%.
      • Anti-vibration foot pads: TPU soft rubber + PP hard plastic composite molding, vibration absorption efficiency ≥70% (10–100Hz frequency band).
  1. Precise Material Selection:
    • Inner Tub & Load-Bearing Parts: PP+30%GF material, bending strength ≥50MPa, adapted to long-term moist-heat environments (water absorption ≤0.05%).
    • Control Panel: PC/ABS alloy, transmittance ≥85% (indicator area), surface scratch resistance (3H hardness).
  1. Pre-Processing Technology:
    • Raw material drying: PBT moisture content controlled ≤0.03% to avoid post-molding hydrolysis cracking.
    • Color matching: Pantone color accuracy ΔE ≤1.0, supporting custom brand-specific gray tones (L* 40–60, a±5, b±5).

(B) Production and Quality Control

  1. Flexible Manufacturing Capability:
    • Rapid Prototyping: 3D printed samples delivered in 48 hours, aluminum mold development cycle 10–15 days (steel mold 35–45 days).
    • Mass Production:
      • High-speed injection lines: Equipped with Kawasaki robots, daily output 10,000 pieces per machine (16-cavity mold).
      • Automated production lines: Integrated visual inspection system, inner tub wall thickness detection accuracy ±0.1mm, defect recognition rate ≥99.5%.
  1. Comprehensive Testing System:
    • Physical Properties:
      • Load-bearing test: Inner tub loaded with 50kg for 24 hours, diameter deformation ≤0.2%.
      • Impact test: 500g steel ball drop from 1m height at -20℃, no surface cracks.
    • Environmental Performance:
      • Moist-heat test: 50℃/95%RH environment for 1000 hours, tensile strength retention ≥75%.
      • Detergent resistance test: 10% laundry liquid cyclic flushing 500 times, no swelling or discoloration.
    • Certification Support: Provides GB 4706, CE, ETL, and other certification reports for global market access.

IV. Multi-Scenario Application Solutions

(A) Core Structural Components

  • Drum Inner Tub: PP+GF blow-molded, inner wall smoothness Ra≤0.8μm, dynamic balance error ≤5g·cm, adapted for 10–12kg washing capacity.
  • Impeller Turntable: Wear-resistant PBT injection-molded, tooth depth 1.5mm, torque transmission efficiency ≥90%, anti-cloth entanglement design.

(B) Functional Parts

  • Water Inlet Valve Housing: High-pressure resistant PP, withstanding 1.6MPa water pressure without leakage, compatible with 3/4″ and 1/2″ interfaces (tolerance ±0.05mm).
  • Filter: Antibacterial ABS material, filter mesh aperture 0.5mm, clip-on design for disassembly in ≤15 seconds, impurity interception rate ≥95%.

(C) Appearance & Control Components

  • Operation Panel: IMD-processed PC/ABS panel, integrated touch buttons (response time ≤5ms), anti-misoperation edge design (chamfer R≥3mm).
  • Outer Side Panels: Matte PP material, surface roughness Ra 2.5μm, anti-fingerprint treatment, scratch hiding ability improved by 40%.

(D) High-End Model Customization

  • Quiet Washing Machine Parts: Inner tub balance ring with liquid silicone-filled PP housing, vibration noise ≤48dB (washing mode), dynamic balance accuracy grade G2.5.
  • Bacteria-Removing Inner Tub: Nano-silver ion-modified PP material, bacteria removal rate ≥99.9% during 60℃ high-temperature washing, compliant with GB 21551.4 standards.

V. Technology Selection Guide

Requirement Type
Preferred Technology
Weight Range
Core Indicators
Delivery Cycle
R&D Validation & Small Batches
3D Printing + Injection Molding
50–500g
Rapid iteration, irregular structures
Prototype in 3 days, batch in 15 days
Moist-Heat Resistant Load-Bearing Parts
Blow Molding + PP+GF
500–2000g
High rigidity, hydrolysis resistance
Prototype in 7 days, batch in 25 days
Large-Scale Standardized Production
Injection Molding + PP
100–1000g
Low cost, high chemical resistance
Prototype in 5 days, batch in 20 days
Custom washing machine plastic parts achieve full-category coverage from 10g precision valves to 2kg large inner tubs through deep integration of material properties, processing technologies, and washing machine operating conditions. Whether meeting the moist-heat resistance needs of core load-bearing components or the aesthetic requirements of control panels, end-to-end technical capabilities ensure each customized solution precisely meets standards for structural strength, environmental adaptability, and functional fitment.
For custom solutions using PP, ABS, PBT, and other materials, certification testing processes, or production capacity data, contact us for professional support from design development to mass production.

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