Compartment Plastic Storage Box | Global OEM & Distributor Sourcing Guide

Technical Specifications & Standard Models

Model Number	External Dimensions (L x W x H)	Material & Grade	Compartment Configuration	Latch Type	Hinge Type	MOQ (Units)
CSB-301	275 x 180 x 45 mm	Virgin PP (High Impact)	18 Removable Dividers	Dual Snap-Latch	Living Hinge	1,000
CSB-402	335 x 220 x 55 mm	Virgin PP / ESD-Safe Variant	24 Fixed & Adjustable Slots	Dual Polycarbonate	Steel Pin Hinge	500
CSB-503	380 x 300 x 80 mm	Copolymer PP	Multi-Tier / Deep Well	Heavy-Duty Slide Latch	Mechanical Pin	500

Custom Engineering Options: Custom dimensions, color masterbatches (Pantone matching), custom foam inserts, and CAD/technical cross-section drawing integration are available upon engineering review.

Product Selection Guide

For Electronics Assembly (ESD Control): Specify ESD-Safe (Static Dissipative) PP. Surface resistivity must test between 10^6 and 10^9 ohms/sq to protect sensitive microchips and PCB components from electrostatic discharge.

For Heavy Hardware & Fasteners (MRO): Choose High-Impact Copolymer Polypropylene (PP). Standard homopolymer PP shatters under heavy steel bolt impacts; copolymer blends absorb kinetic energy and resist stress-whitening.

For Visual Inventory Audits (High Clarity): Select Polycarbonate (PC) or crystal-grade SAN lids. PC offers superior impact resistance coupled with optical transparency, allowing technicians to verify part counts without opening the lid.

For Harsh Chemical Environments: Opt for chemically resistant grades rated against cutting fluids, machine oils, and isopropyl alcohol without degrading or leaching plasticizers.

Application Suitability Matrix

Application Sector	Recommended Material	Critical Performance Requirement	Standard Validation Test
Automotive MRO Service	Copolymer PP	Drop-impact resistance at -10 deg C	Drop test: 1.5m onto concrete floor
Electronics Manufacturing	ESD-Conductive PP	Surface resistivity & charge decay	ANSI/ESD STM11.11
Medical Device Kitting	USP Class VI PP / ABS	Autoclavability / Chemical sterilization	ISO 10993 biocompatibility screening
Field Technician Tool Kits	High-Density PP	Hinge fatigue life & secure lid seal	10,000-cycle continuous opening test

Material, Manufacturing & Quality Control

Resin Selection & Traceability
All production runs utilize 100% virgin thermoplastic resins sourced directly from petrochemical tier-1 suppliers (e.g., ExxonMobil, Formosa Plastics, LyondellBasell). No degraded post-consumer regrind is used in structural enclosure molding, ensuring consistent tensile strength and predictable thermal performance. Material Lot Traceability Certificates are provided with every master shipment.

Injection Molding Infrastructure
Production is executed on closed-loop, servo-driven injection molding machines ranging from 160T to 550T clamping force. Process parameters-including melt temperature, injection velocity, holding pressure, and cooling time-are computer-monitored in real time to eliminate internal voids, sink marks, and gate stress.

Mold Tooling & Tolerance Control

Machining: Molds are precision-machined via CNC high-speed milling and EDM wire cutting.

Lid-to-Grid Tolerance: Maintained within +/- 0.15 mm to ensure complete surface contact between internal grid walls and the closed lid, preventing component migration between compartments during transit.

Draft Angles: Optimized at 1.5 deg to 2 deg for smooth part ejection without surface drag marks.

Quality Testing & Verification

Each production lot undergoes rigorous quality assurance protocols:

Hinge Fatigue Testing: Mechanical test fixtures cycle container lids through 10,000 open-close arcs to verify structural integrity of living hinges or pin joints.

Drop Impact Testing: Loaded containers (filled to maximum rated weight capacity) are dropped from a 1.2-meter height across six spatial orientations to confirm structural impact resistance.

Dimensional Inspection: CMM (Coordinate Measuring Machine) verification of locking tabs, hinge alignment, and grid slot tolerances.

Supplier Verification & Manufacturing Compliance

Facility Certifications:

ISO 9001:2015 Quality Management System certified manufacturing plant.

Environmental & Regulatory Compliance:
RoHS Directive (EU 2015/863): Restricted heavy metals and phthalates eliminated from all raw material formulations.

REACH Regulation: Full SVHC (Substances of Very High Concern) disclosure available upon request.

FDA 21 CFR: Food-contact compliant raw material grades available for food-processing and medical kitting sectors.

Packaging & Logistics Standards: Export-grade 5-layer corrugated master cartons reinforced with edge protectors. Palletized loads are stretch-wrapped and strapped to prevent transit shifting and carton compression.

Procurement Decision & Ordering Workflow

Specification Review:

Match application requirements against our standard model matrix or submit engineering drawings (STEP/IGES) for custom tooling.

Sample Evaluation:

Request physical pre-production samples (Lead time: 3-5 business days via DHL/FedEx) for destructive testing and assembly fit checks.

Commercial Terms:
MOQ: 500 units per standard SKU; 1,000 units for custom Pantone color matching.

Incoterms: Standard terms include FOB (Port of Loading), EXW (Ex Works), or CIF upon request to accommodate global freight routing.

Payment Terms: T/T (30% deposit, 70% balance against Bill of Lading copy) or L/C at sight for qualifying volume accounts.

Lead Time: 15-25 business days for standard bulk production runs.

Order Confirmation & QC Report: Pre-shipment inspection (PSI) reports conforming to AQL 2.5 standards are issued prior to final balance settlement.

FAQ

Q: What is the difference between living hinges and steel-pin mechanical hinges for bulk ordering?

A: Living hinges are molded as an integrated continuous piece of thermoplastic resin, offering cost-effective performance for standard commercial storage. Steel-pin mechanical hinges utilize a metal rod inserted through interlocking barrels, providing superior structural rigidity, alignment stability, and endurance for heavy-duty industrial environments subject to frequent high-cycle usage.

Q: Can you mold custom compartment layouts without creating an entirely new mold tool?

A: Yes. For custom internal layouts, we can modify existing mold inserts or supply boxes featuring a high-density vertical/horizontal slot matrix paired with removable injection-molded divider strips. This allows customized compartment sizing without incurring full tooling development costs.

Q: How do you prevent small parts from sliding between compartments when the box is closed?

A: Our tooling design incorporates a precision clearance tolerance (<= 0.15 mm) between the underside ribs of the lid and the top edges of the internal compartment walls. When latched, the lid exerts uniform downward pressure across the entire grid network, securely sealing each individual compartment.

Q: Are your plastic storage boxes resistant to industrial solvents and cutting oils?

A: Standard Polypropylene (PP) and Copolymer PP exhibit excellent resistance to water, dilute acids, alkalis, and most aliphatic hydrocarbons. However, exposure to aromatic hydrocarbons or strong oxidizing agents requires specialized engineering thermoplastics such as ABS or Polycarbonate. Consult our engineering team with your specific chemical exposure list for material recommendation.

Q: What is your standard procedure for private label branding on bulk orders?

A: We offer two primary branding methods: Hot Stamping / Pad Printing: Directly applying company logos, part numbers, or barcode serialization onto the flat exterior lid surface. Custom Mold Insert (Texturing): Integrating an interchangeable steel logo insert directly into the mold cavity, creating a permanent, debossed corporate logo during the injection molding process.

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