| Submitted | Field | Original | Note / Status | |
|---|---|---|---|---|
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Automatic mm / inch conversion · Core engineering specifications
| Overall dimensions | 660 x 610 x 900 mm | |
|---|---|---|
| Maximum adjustable seat height | 530 mm | |
| Minimum adjustable seat height | 420 mm | |
| Backrest height | 410 mm | |
| Seat surface dimensions | 390 x 390 mm | |
| Four-prong base span | 610 mm | |
| Caster diameter | 50 mm | |
| Backrest width | 350 mm | |
| Seat padding thickness | 60 mm | |
| Backrest padding thickness | 50 mm | |
| Lift column diameter | 50 mm | |
| Finished Seat Cushion Thickness | 90 mm | |
| Lumbar Support Zone Height | 240 mm | |
| Clear Width Between Armrests | 540 mm |
Net weight / load capacity / users / durability
| Net weight | 8 kg | |
|---|---|---|
| Maximum static load capacity | 113 kg | |
| Single caster rated load | 20 kg | |
| Suitable child height range | 170 cm | |
| Upholstery abrasion resistance | 30000 cycles | |
| Seat foam density | 35 kg/m³ | |
| Foam rebound rate | 45% | |
| Seam stitch pitch | 8 mm | |
| Seat Foam Density / Rebound Reference | 45 kg/m³ / 65% | |
| Back Foam Density Reference | 38 kg/m³ |
Core acceptance fields · Panels / hardware / frame / upholstery
| Seat cushion core | High-resilience polyurethane foam | |
|---|---|---|
| Backrest cushion core | High-resilience polyurethane foam | |
| Upholstery fabric | Printed woven polyester with snowflake pattern | |
| Lift adjustment columns | Powder-coated carbon steel tubing | |
| Four-prong base | Injection-molded polypropylene with color-matched finish | |
| Caster wheels | Nylon tire with carbon steel mounting bracket | |
| Adjustment locking clips | Reinforced polypropylene | |
| Base support crossbars | Powder-coated steel tube | |
| Seat Internal Support Board Thickness | 14 mm bent plywood or equivalent support board | |
| Backrest Internal Frame Thickness | 14 mm bent plywood/composite reinforced frame | |
| Gas-lift Engineering Specification | Recommended Class 4; outer tube 50 mm; stroke 100 mm | |
| Tilt Mechanism Plate Thickness | 2.5 mm cold-rolled steel |
Adjustment / rotation / tilt / mobility / storage features
| Mechanical seat height adjustment | Segmented lockable adjustment with 110mm total travel | |
|---|---|---|
| Gravity-activated caster braking | Automatic wheel lock under seated load to prevent unwanted movement | |
| 360-degree caster swivel | Smooth omnidirectional rolling when unloaded for easy repositioning | |
| Ergonomic posture support | Contoured separate backrest to encourage upright seated study posture | |
| Screwless quick assembly | Tool-included snap-together assembly for home installation | |
| Anti-tip base design | Four-point wide base footprint to prevent tipping during normal use | |
| Recline Angle / Lock Reference | 125° with 3suggested lock positions | |
| Tilt Tension User-weight Range | Reference adjustment coverage 120 kg | |
| Rotation / Mobility Configuration | 360° swivel with 5-caster multidirectional movement |
Verified carton / gross weight / assembly / loading data
| Reference Package Count | 1 set / 2 cartons | |
|---|---|---|
| Reference Assembly Time | 40 minutes per set | |
| Reference Carton Dimensions | 850× 420× 720 mm | |
| Reference Packaged Gross Weight | 23 kg/set | |
| Reference Carton Volume | 0.26 m³/set | |
| Indicative 20GP Loading | 135 sets at 85% space utilization | |
| Indicative 40HQ Loading | 320 sets at 85% space utilization |
Recommended spaces / users / usage modes
| Home children's study area | Pair with height-adjustable study desk for K-12 student homework use | |
|---|---|---|
| Dedicated home classroom | Provide upright posture support for extended remote learning sessions | |
| Children's bedroom | Compact footprint fits small rooms without occupying excessive floor space | |
| Tutoring center training rooms | Adjustable height fits a wide range of student ages for shared use | |
| Preschool and early elementary spaces | Gravity brake casters prevent rolling while children are seated | |
| Multi-child household use | Multiple color options let parents assign chairs to individual children | |
| Recommended Matching Desk Size | 2.4 m executive desk | |
| Reference Daily Use Duration | 8 hours/day; confirm by ergonomic testing |
EU Market Access Requirements* EN Standards
| EN 1729-1:2015 | Furniture for educational institutions Part 1: Functional dimensions for chairs | |
|---|---|---|
| EN 1022:2018 | Domestic furniture seating, test method for stability | |
| EN 12520:2015 | Domestic furniture seating, strength, durability and safety requirements |
Standards applicable to China-market projects
| GB 28007-2011 | General technical requirements for children's furniture, applicable for structural safety | |
|---|---|---|
| GB/T 3324-2017 | General technical requirements for wooden furniture, applicable for plastic/metal furniture safety | |
| GB 6675.1-2014 | Toy safety Part 1: Basic specification, applicable for child product small parts safety |
This product must meet the following technical requirements: 1. GB 28007-2011: General technical requirements for children's furniture, applicable for structural safety; 2. GB/T 3324-2017: General technical requirements for wooden furniture, applicable for plastic/metal furniture safety; 3. GB 6675.1-2014: Toy safety Part 1: Basic specification, applicable for child product small parts safety; Final delivery parameters, test reports, and acceptance criteria are subject to the purchase contract.
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