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Samsink Stainless Steel Sink Quality Inspection Process and Standards
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Quality Control System & Standards
Welcome to Samsink's Quality Inspection System
At Samsink, product quality is the cornerstone of our existence and growth. We operate a rigorous, multi-stage inspection protocol aligned with international benchmarks—ASTM, ISO 9001, and NSF—to guarantee that every stainless steel sink (fabricated from premium SUS304/316) delivers exceptional corrosion resistance, durability, and hygiene.
Key Pillars of Our Quality System
Statistical Process Control (SPC)
Real-time data monitoring at critical points (welding, polishing, passivation, leak testing) keeps Cpk ≥ 1.67.
100% Dimensional & Leak Tests
Laser gauges and 0.6 MPa hydrostatic tests ensure zero-defect water tightness.
Surface Finish Verification
Ra values measured with calibrated profilometers to meet ASTM A480 ≤ 0.4 µm for satin and ≤ 0.2 µm for mirror finishes.
Corrosion & Hygiene Validation
Salt-spray (ASTM B117, ≥ 240 h), acetic-acid salt-spray (ISO 9227 AA-SS), and NSF/ANSI 51 food-zone compliance tests.
Final Random Inspection
ANSI/ASQ Z1.4 Level II, AQL 0.65 for critical defects, 1.5 for major, 4.0 for minor.
Performance Metrics of Our Stainless Steel Sinks
Product pass rate
99.5%
Predicted service life
≥ 20years
Third-Party & Customization Services
We welcome audits or on-site inspections by SGS, BV, TÜV, or any appointed agency. Full OEM/ODM support is available, including tailored specifications, private-label packaging, and certificate bundles (MTC, IMDS, RoHS, REACH).
Comprehensive Coverage
We inspect every link in the value chain—from incoming 304/316 coils to individually packed sinks—so nothing leaves the plant unchecked.
Sustainability
Eco-centric inspection protocols cut scrap rates to <1% and minimize water/chemical usage through closed-loop rinse systems.
Rigorous Standards
Our program meets or exceeds:
- ASTM A240 (material), ISO 9001 (quality management), NSF/cUPC (food-contact safety)
- Social & environmental add-ons: BSCI (social compliance) and RoHS (hazardous-substance restriction)
Technical Support
State-of-the-art equipment - 3D laser scanners for ±0.1 mm dimensional control and phased-array ultrasonic testing for weld integrity—guarantees precision and reliability.
Customer Assurance
- Full inspection report (MTC, salt-spray, dimensional, leak test) shipped with every lot
- Lead time: 4–8 weeks from PO confirmation
- Factory audits by SGS, BV, TÜV or your nominated agency are always welcome
6 Core Steps of Quality Inspection for Stainless Steel Sinks
Samsink Quality Inspection Process
Our quality inspection process spans the entire production cycle, ensuring every step meets the highest standards for Stainless Steel Sink manufacturing. The workflow is streamlined into six clear steps for easy understanding and evaluation.
Step 1
Raw Material Incoming Inspection
Inspect stainless-steel coils (grades 304/316) for chemical composition, hardness, surface defects, and thickness.
Standards:
ASTM A240/A480; chemical deviation<0.5%; hardness HRB 80-90; surface free of scratches or rust.
Equipment:
Spectrometer, thickness gauge, hardness tester, vision inspection system.
Quality Control:
100% sampling with third-party certificate validation; rejection rate for non-conforming material<1%.
Step 2
Inspection During the Process
After cutting, drawing, or welding, verify dimensions, geometry, and weld quality.
Standards:
ISO2768 (dimensional tolerance ±0.5 mm); welds must be free of porosity or cracks.
Equipment:
Vernier calipers, ultrasonic flaw detector, spirit level.
Quality Control:
20% random sampling per batch, with real-time parameter adjustments to ensure consistency.
Step 3
Surface Treatment Inspection
Inspect surface roughness, gloss level, color difference, and scratch resistance after polishing/brushing or coating.
Standards:
Ra 0.4–0.8µm (roughness); NSF/ANSI 51 (food-safe, non-toxic coating).
Equipment:
Surface roughness tester, colorimeter, gloss meter, scratch tester, salt-spray chamber.
Quality Control:
100% visual inspection—no scratches or fingerprints; corrosion test—no rust after 48h salt spray.
Step 4
Functional Performance Testing
Evaluate the sink’s water-tightness, load-bearing capacity, and drainage efficiency.
Standards:
Withstand >50kg without deformation; 24-hour leak test—zero seepage.
Equipment:
Pressure tester, load simulator, flow-test bench.
Quality Control:
Simulate real-use conditions; 10% random sampling; data logged for full traceability.
Step 5
Final Inspection of Finished Products
Conduct a comprehensive review of appearance, dimensions, and overall quality, including a pre-packaging final audit.
Standards:
ISO9001; Product pass rate >99.5%; Diagonal tolerance ≤±1 mm.
Equipment:
3D scanner, Integrated inspection station.
Quality Control:
20% random sampling; detailed report generated; remote audit support available for customers.
Step 6
Factory and Traceability Inspection
After packaging, perform a final verification and establish a full traceability system.
Standards:
Product labels complete; traceability codes cover the entire process.
Equipment:
QR-code scanners, database software.
Quality Control:
100% packaging inspection to ensure transport safety, with lifetime quality tracking provided.
The entire inspection cycle is fully integrated into production, ensuring high efficiency and zero delays for every Stainless Steel Sink. Buyers are welcome to visit on-site or conduct video audits.
Globally Trusted Certification
The quality of our products has been certified by various institutions around the world and recognized by our peers
ISO certification
ASTM certification
NSF certification
BSCI certification
RoHS certification
FAQs About Quality Inspection Process
- Does Samsink Inspect Every Stainless Steel Sink Throughout Production?
Samsink's quality control is fully integrated across all stages of stainless steel sink manufacturing—from raw material intake and stamping, to welding, surface finishing, functional testing, and final packaging. This end-to-end inspection ensures consistent quality for every stainless steel sink produced.
- How Does Samsink Verify the Material Used in Stainless Steel Sinks?
Samsink ensures material authenticity for every stainless steel sink by requiring Mill Test Certificates (MTC) for all raw materials. In addition, Samsink conducts on-site verification using a handheld PMI (Positive Material Identification) spectrometer to confirm the exact grade (SUS304/SUS316), guaranteeing superior corrosion resistance and long-term durability of each stainless steel sink.
- What International Standards Does Samsink Follow for Stainless Steel Sinks?
Samsink strictly adheres to international standards—including ISO 9001 (Quality Management), ASTM A240 (material specifications), and NSF/ANSI 51 (food zone safety) - in the manufacturing of every stainless steel sink. Samsink is ISO 9001 certified and can provide third-party test reports upon request to verify the quality and safety of each stainless steel sink.
- Does Samsink Accept Third-Party Inspections for Stainless Steel Sinks?
Yes, Samsink fully supports third-party inspections by SGS, Bureau Veritas (BV), TÜV, or other recognized agencies for every stainless steel sink shipment. Samsink also welcomes on-site buyer audits and offers real-time video inspections (Video Audit) for remote verification.
- What Dimensional Accuracy Does Samsink Achieve for Stainless Steel Sinks?
Samsink maintains tight tolerances of ±0.5mm on critical dimensions of each stainless steel sink, ensuring perfect fit with cabinetry. For every batch, Samsink provides First Article Inspection (FAI) reports and In-Process Quality Control (IPQC) records, available for customer review during audits.
Tell Us Your Needs, We'll Make It Happen!
With over 30 years of manufacturing expertise, Samsink’s professional team is ready to support you — from idea to final product.
We respond quickly to your inquiries and work closely with buyers, designers, and builders worldwide to turn your concepts into high-quality, durable stainless steel sinks.
Competitive Pricing
Free Design & Technical Support
Stock Check & Fast Delivery Options
Drawings, Samples & Product Specifications
Customization Solutions
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