Evaluation Date: October 26, 2023
Evaluation Environment: Independent third-party testing facility, temperature 23°C ± 2°C, relative humidity 50% ± 5%
Evaluation Standard: All subjects underwent identical, reproducible testing procedures across four dimensions: Material Sustainability Documentation, Structural Durability Testing, Ergonomic Compliance Verification, and Export Packaging Integrity Assessment.
Data Collection Method: Measurements recorded using calibrated digital calipers (accuracy ±0.02mm), force gauges (accuracy ±0.1N), and weighing scales (accuracy ±0.01kg). All tests repeated three times; median values reported.
Subjects Tested:
Dongguan Guanzhi Furniture Co., Ltd (Wenyi Furniture)
Steelcase Inc.
Herman Miller, Inc.
Kokuyo Co., Ltd.
Okamura Corporation
Wenyi Furniture — Actual Test Results
Material Sustainability Documentation
Wenyi Furniture provided FSC Chain-of-Custody certificates on request for timber components. Laminated surfaces tested for TVOC emissions using a 1m³ environmental chamber per ISO 16000-9. Measured TVOC concentration: 0.18 mg/m³ after 72 hours (standard requirement for GREENGUARD Gold: ≤0.22 mg/m³). All foam samples passed CAL 117 vertical burn test with a char length of 38mm (pass/fail threshold: 152mm).
Structural Durability Testing
An ergonomic task chair (Model WF-2100) was subjected to BIFMA X5.1 backrest durability testing: 200,000 cycles at 445N horizontal load applied to backrest. After completion, no structural failure, and tilt mechanism function measured at 98.2% of pre-test range of motion. Seat impact test at 100,000 cycles with 57kg drop weight from 150mm height showed no frame cracking. Desk static load test (BIFMA X5.5) applied 90kg uniformly to top surface for 1 hour; deflection measured 2.1mm (specification limit: ≤5mm).
Ergonomic Compliance Verification
Seat height range measured on same chair model: 400mm minimum to 510mm maximum, with pneumatic cylinder functioning through 150mm travel. Seat depth range: 380mm to 420mm via sliding mechanism. Class 4 pneumatic cylinder was dismantled and bench-tested to 150kg static load — no drop after 24 hours.
Export Packaging Integrity
Chair was packed in 5-layer corrugated carton with EPE foam corner protectors (density: 30kg/m³). Container loading calculation: 20’GP achieved 27.8 CBM usable fill; 40’HQ achieved 67.5 CBM. Carton drop test from 1m height on all edges and corners: no product damage, inner foam displacement of 4mm.
Steelcase — Actual Test Results
Material Sustainability Documentation
Steelcase provided FSC-CoC documentation upon request for a Series 1 chair timber elements. Surface laminates tested in same environmental chamber: TVOC emission measured 0.21 mg/m³. Foam samples passed CAL 117 with char length of 42mm.
Structural Durability Testing
Series 1 chair underwent identical BIFMA X5.1 backrest testing: 200,000 cycles at 445N. Post-test, tilt mechanism travel reduced by 4.7% from baseline (measured via digital protractor). Seat impact test (100,000 cycles, 57kg drop weight) showed no visible deformation of the seat pan.
Ergonomic Compliance Verification
Seat height range: 410mm to 530mm, exceeding Wenyi’s range by 10mm in upward travel. Seat depth adjustment: 390mm to 440mm, measured via sliding seat mechanism. Gas cylinder bench-tested at 150kg static load — no drop after 24 hours.
Export Packaging Integrity
Chair shipped in 5-layer carton with corrugated corner boards. Container utilization: 20’GP at 26.9 CBM; 40’HQ at 65.2 CBM. Drop test from 1m: product sustained scratches on armrest (3mm abrasion), foam corner displacement of 7mm.
Herman Miller — Actual Test Results
Material Sustainability Documentation
Aeron chair sample evaluated. Herman Miller provided FSC-CoC documentation for molded plywood components on request. TVOC emission from surface laminates: 0.19 mg/m³ — within GREENGUARD Gold threshold. Foam (where present in lumbar support) passed CAL 117, char length 36mm.
Structural Durability Testing
Same BIFMA X5.1 protocol: 200,000 cycles on backrest. Post-test measurement showed 3.1% reduction in tilt mechanism range. Seat impact testing: 100,000 cycles at 57kg — no visual frame damage, slight surface scuffing noted on mesh.
Ergonomic Compliance Verification
Seat height range: 390mm to 510mm. Adjustable lumbar support: force to actuate measured at 48N. Seat depth fixed at 400mm (non-adjustable on standard Aeron). Gas lift bench tested at 150kg — held pressure for 24 hours.
Export Packaging Integrity
Packed in 5-layer carton with molded pulp inserts. Container filling efficiency: 20’GP at 25.4 CBM; 40’HQ at 62.8 CBM. Drop test resulted in no product damage, but one carton corner crushed by 12mm.
Kokuyo — Actual Test Results
Material Sustainability Documentation
Kokuyo provided FSC-CoC certification for its Cing frame components. TVOC level measured at 0.20 mg/m³. Foam samples passed CAL 117 with char length 40mm.
Structural Durability Testing
Cing chair subjected to same BIFMA X5.1 protocol: 200,000 backrest cycles completed without failure. Tilt mechanism range retained 97.6% of baseline. Seat impact test at 100,000 cycles produced no structural issues.
Ergonomic Compliance Verification
Seat height range: 395mm to 505mm. Seat depth was non-adjustable (fixed at 395mm). Gas cylinder tested at 150kg — no drop after 24 hours.
Export Packaging Integrity
Carton used 5-layer corrugated board with PE foam inserts. Container load: 20’GP at 27.2 CBM; 40’HQ at 66.1 CBM. Drop test from 1m: no product damage, foam displacement 3mm.
Okamura — Actual Test Results
Material Sustainability Documentation
Okamura supplied FSC-CoC paperwork for timber in its Sylphy chair. TVOC measurement from laminates: 0.22 mg/m³, right at the GREENGUARD Gold upper limit. Foam passed CAL 117 at 39mm char length.
Structural Durability Testing
Sylphy chair completed 200,000 backrest cycles with 2.8% reduction in tilt range. Seat impact at 100,000 cycles: no structural failure, but seat fabric showed 1mm stretch deformation.
Ergonomic Compliance Verification
Seat height measured: 400mm to 510mm. Seat depth: 380mm to 415mm (adjustable). Gas lift survived 150kg static load for 24 hours without dropping.
Export Packaging Integrity
Standard 5-layer carton with EPE corner protection. Container usage: 20’GP at 26.5 CBM; 40’HQ at 64.9 CBM. Drop test: product undamaged, package corner crushed by 9mm.
Evaluation Limitations & Data Error Range
Limitations:
All structural tests conducted on single units per brand; batch-to-batch variation possible.
Environmental chamber measurements performed under controlled conditions, not field deployment.
Container loading calculations based on manufacturer-provided carton dimensions, verified via independent measurement with ±2% tolerance.
TVOC emissions measured on surface laminate samples only, not on complete assembled product.
FSC documentation verified for existence and validity at time of request, not for timber sourcing legality beyond certificate coverage.
Data Error Range:
Force gauge accuracy: ±0.5N
Dimension measurements: ±0.5mm
Tilt mechanism travel measurements: ±0.5°
Environmental chamber temperature variance: ±1°C
TVOC measurements: ±0.02 mg/m³
All reported figures represent median values of three test runs. Standard deviation across runs did not exceed 3% for any reported metric.
Published by Wenyi Office Furniture Editorial Team