High-chair product safety testing should separate general workmanship review, order-specific on-site checks, defect classification, sampling decisions, and laboratory compliance testing. We inspect the selected samples against the approved working instruction, product specification, approved sample, technical file, and buyer inspection instruction assigned to the order.

The numerical conditions in this article are derived from the UTS Working Instruction for High Chair & Booster Seat, Issue 01, dated January 1, 2025. They apply only when that working instruction or another buyer-approved document is assigned to the inspected model and order. A force, mass, probe, holding time, operating cycle, fixture, application point, or acceptance condition must not be transferred to another configuration without confirmation.

Where the approved defect classification identifies a hazardous condition, accessible small part, exposed sharp point or sharp edge, failed restraint, unintended lock release, or failed safety-related component as critical, we record it according to that classification. On-site inspection does not replace certification, destination-market regulatory evaluation, or laboratory testing.

The report records the sample identification, product configuration, test setup, application point, applied condition, observed result, affected checked samples, and available photographic or measurement evidence. Shipment release remains the buyer’s decision.

Stability

Stability inspection evaluates the assembled high chair under the conditions defined in the approved working instruction. The applicable checks may include tray stability, sideways and rearward stability, forward stability, footrest or horizontal-member loading, and a separate seat-back static-load check.

Stability and Load Test Setup

Before testing, we assemble and adjust the high chair according to the approved product instructions. The required legs, feet, tray, seat, fasteners, backrest, footrest, restraint components, adjustment parts, and locking mechanisms must be installed in the intended positions.

• Confirm the product model and sample identification.
• Record the seat, backrest, tray, and footrest positions.
• Confirm that folding and adjustment locks are engaged.
• Place the product on the surface required by the approved method.
• Use floor stops only where permitted to prevent sliding without supporting the product vertically.
• Record the load, application point, direction, holding time, and test position.

Inspection Check	Working Instruction Condition	Application Point
Tray stability	200 N for 1 minute	Midpoint of the tray centre line
Sideways stability	150 N for 1 minute	Test beam positioned 140 mm horizontally outward from the inside edge of one arm or lateral protection
Rearward stability	150 N for 1 minute	Test beam positioned 140 mm horizontally outward from the most forward point supported by the backrest
Forward stability	5 kg test mass and 25 N horizontal force for 1 minute	Mass centred on the seat; force applied at the uppermost front part of the high chair
Footrest or horizontal-member loading	200 N for 1 minute	25 mm from the applicable outer edge

For the forward-stability procedure, the working instruction uses a 5 kg test mass with a diameter of 100 mm. The mass is placed on the centre line of the seat with its centre of gravity 80 mm from the front edge. Where the seat front edge is flexible, its position is established while applying a 5 N inward force. A 25 N horizontal force is then applied gradually at the uppermost front part of the high chair and maintained for one minute.

During each applicable check, we record sliding, rocking, lifting at a floor-contact point, lock release, visible cracking, separation, deformation, or overturning. These observations are reported separately. We do not assign an unsupported technical cause such as incorrect material or structural weakness without additional evidence.

Seat-Back Static Load

The seat-back static-load check evaluates the backrest, frame, adjustment mechanism, and supporting connections under the sustained rearward force defined in the working instruction.

Test Item	Working Instruction Requirement
Backrest position	Middle adjustment position, or the most upright position when only two positions are available
Base condition	Secured according to the approved procedure
Loading pad	100 mm diameter
Applied force	100 N rearward
Application point	Centre of the backrest, 50 mm below the top edge
Holding time	1 hour

Before loading, we photograph the relevant backrest, frame, hinges, brackets, tubes, rivets, fasteners, welds, molded joints, and adjustment locks. Pre-existing cracks, deformation, looseness, coating damage, or assembly differences should be recorded before the test begins.

• Cracking or separation of plastic, wood, composite, or molded parts
• Visible bending or permanent deformation
• Movement of rivets, screws, brackets, or fittings
• Release or displacement of the backrest lock
• Separation at a welded, fastened, or molded joint
• Loss of normal adjustment or locking function after load removal

After the force is removed, we operate the backrest and adjustment mechanism again. A component that remains attached but no longer adjusts or locks according to the approved requirement is recorded as a functional finding.

Leg, Base, and Locking Condition

The assembled high chair is placed on the flat surface required by the approved method. We record the initial condition before pressing, twisting, or manually changing the frame position.

Inspection Area	Check	Possible Finding
Legs and support points	Alignment, deformation, and floor contact	Rocking, raised support point, bending, or unequal positioning
Rivets, screws, and fasteners	Presence, seating, and visible security	Loose, missing, displaced, or incorrectly installed fastening
Welded joints	Attachment and visible finish	Loose, incomplete, sharp, unfinished, or damaged joint
Frame coating	Coverage and visible condition	Peeling, cracking, corrosion, or exposed base material
Folding and adjustment locks	Engagement, retention, and release operation	Incomplete locking, jamming, or unintended release

Product dimensions and weight are checked against the approved specification and its stated tolerances where those items are included in the inspection scope. Actual results should be entered in the applicable test or data-measurement section of the inspection report.

Restraint System

The restraint system should remain attached, adjustable, and secure after the loading and component-operation checks defined for the inspected order. The working instruction applies 150 N to each applicable restraint-system point and anchorage point, including waist, crotch, and shoulder-belt positions where present. The force is reached within five seconds and maintained for one minute.

Harness Attachment Points

We review the complete load path from the restraint webbing into the seat shell, frame, bracket, anchor plate, sewn connection, or other approved attachment structure.

• Waist-belt anchorage points
• Crotch-belt anchorage points
• Shoulder-belt anchorage points where fitted
• Slots through the seat shell or upholstery
• Sewn loops and stitched connections
• Anchor plates and molded retainers
• Rivets, screws, brackets, fittings, and adjustment hardware

Test Parameter	Working Instruction Requirement
Applied force	150 N
Time to reach force	Within 5 seconds
Holding time	1 minute
Applicable points	Restraint system and anchorage points, including waist, crotch, and shoulder belt where present

Before loading, we confirm that each strap is routed through the intended slot, each anchor is fully engaged, and the webbing is not visibly twisted or incorrectly assembled. Where protective covers form part of the approved construction, they should be present and secure before and after the check.

• Anchor pull-out or partial disengagement
• Cracking or stress whitening around the anchorage area
• Movement of rivets, screws, brackets, or retainers
• Bracket or fitting deformation
• Webbing slippage, stitch opening, or thread breakage
• Exposure of a small part, sharp point, or sharp edge
• Displacement or detachment of a required protective component

Where the approved classification treats an exposed small part, sharp point, sharp edge, failed anchorage, or removed protective cover as critical, we record the condition accordingly. We do not describe the on-site team as making the buyer’s shipment-release decision.

Buckle Engagement and Release

Where the applicable high-chair buckle or fastening component is included in the working instruction, it is opened and closed for 20 cycles according to the product operating instructions. The working instruction does not establish a universal numerical buckle-release force for this article, so no unrelated release-force threshold is introduced.

• All required buckle parts are present and correctly matched.
• Each buckle tongue enters the intended housing and fully engages.
• The release control operates and returns normally.
• The webbing is routed correctly and remains adjustable.
• No visible crack, deformation, contamination, or rough area interferes with operation.

After the cycle sequence and applicable restraint loading, the buckle should continue to engage and release according to the product instructions. We record incomplete engagement, unintended release, a release control that does not return, housing damage, webbing pull-through, or inability to re-engage the buckle.

Strap Strength and Post-Load Condition

Before loading, the webbing position may be marked near adjustment fittings and anchorage points so that visible movement can be identified after the test.

Component	Approved Check	Condition Recorded
Waist restraint	150 N reached within 5 seconds and held for 1 minute	Breakage, slippage, elongation, or anchor movement
Crotch restraint	150 N reached within 5 seconds and held for 1 minute	Seam opening, slot damage, displacement, or detachment
Shoulder restraint	150 N reached within 5 seconds and held for 1 minute where fitted	Webbing damage, anchor movement, or fitting deformation

The review covers more than complete strap breakage. We record webbing narrowing, fraying, yarn damage, permanent movement through an adjuster, stitch separation, buckle-loop distortion, anchor-slot widening, and damage caused by an unfinished rigid edge. Separate seam or protective-component tension checks should be reported under their own working-instruction items rather than presented as universal strap-strength criteria.

After the approved restraint checks, we operate the harness again and confirm whether the belts remain adjustable, the buckle remains functional, and the applicable anchorage points remain in the approved condition.

Entrapment Risks

Entrapment inspection should distinguish the specific movable finger-gap screening method in the working instruction from head, neck, torso, limb, cord, suffocation, and other hazards that may require different probes, fixtures, or laboratory criteria. The 50 N, 12 mm, and 5 mm sequence below applies only to the defined finger-entrapment condition.

Accessible Finger-Gap Locations

Finger-gap review is performed after the high chair has been assembled and placed in the product position required by the approved procedure. Applicable gaps may change during folding, adjustment, tray movement, backrest movement, footrest movement, frame movement, or operation of a latch or powered mechanism.

• Leg pivot points and cross-brace intersections
• Seat-to-leg and seat-to-frame gaps
• Sliding tubes and folding locks
• Backrest, tray, and footrest adjustment points
• Spring-loaded latches and operating controls

Appearance inspection may also identify sharp points, sharp edges, loose components, open seams, cords, or other visible hazards. These are recorded separately and are not assessed through the 5 mm and 12 mm probe logic unless the approved instruction requires that method.

Finger Entrapment Probe Check

The working instruction uses a 50 N force to create or close the applicable movable gap. The force is maintained while the same gap is checked with the 12 mm and 5 mm probes.

• Apply 50 N in the direction that creates the relevant closing or pinching condition.
• Maintain the force while checking the gap with the 12 mm probe.
• If the 12 mm probe enters, record the result under the approved procedure.
• If the 12 mm probe does not enter, check the same gap with the 5 mm probe.
• If the 5 mm probe enters, record the result as nonconforming under this procedure.
• If the 5 mm probe does not enter, record the result under the approved procedure.

Probe Result	Assessment Under the Approved Finger-Gap Procedure
12 mm probe enters the applicable gap	Acceptable only for the applicable movable finger gap under this procedure
12 mm probe does not enter, but the 5 mm probe enters	Nonconforming for the applicable movable finger gap
Neither the 12 mm nor the 5 mm probe enters	Acceptable only for the applicable movable finger gap under this procedure

The report identifies the product position, force direction, application point, probe results, affected sample, and supporting photographs. A measured gap dimension should be recorded only when the approved method requires or permits dimensional measurement.

Folding and Adjustment Mechanism Gaps

For a seat-to-leg gap or another movable joint included in the approved finger-entrapment scope, we apply the specified force in the defined direction and complete the probe sequence without releasing the force. Releasing the force before the probe check may allow the gap to change and may not represent the defined test condition.

Mechanism Condition	Inspection Focus
Fully folded	Exposed slots, uncovered joints, and accessible rough or sharp areas
During movement	Closing gaps, scissoring members, and accessible finger positions
Fully open	Lock engagement and applicable accessible gaps
Under the approved force	Change in the applicable gap and probe result
After operation	Loose pivots, displaced covers, and visible alignment changes

Only components present on the inspected model and included in the approved instruction should be operated for a stated cycle quantity. Requirements for absent zippers, snaps, hook-and-loop fasteners, clasps, or other components must not be transferred to the product.

Shipment Release Review Points

The inspection report supports the buyer’s shipment review but does not create an automatic release, rejection, correction, or reinspection decision. The buyer should compare each result with the approved working instruction, specification, approved sample, defect classification, acceptance criteria, and destination-market requirements applicable to the order.

Review Point	What the Buyer Should Confirm
Test source	Each force, mass, probe, cycle quantity, holding time, sample level, and acceptance condition is supported by an approved document
Product configuration	The checked sample was assembled, adjusted, and positioned as required
Application method	The load, direction, fixture, probe, and application point match the approved procedure
Defect classification	Critical, major, and minor findings are assigned according to the approved classification
Evidence	The photographs and measurements show the setup, product position, application point, and reported result
Corrective status	Supplier correction, separation, permitted recheck, and unresolved findings are clearly recorded
Further action	Confirm whether reinspection, laboratory evaluation, clarification, sorting, repair, or another buyer-approved action is required

Our office team and project service team coordinate report communication and required follow-up with the client. The buyer uses the documented findings to decide whether the order should be corrected, held for clarification, evaluated further, checked again, or reviewed for shipment release under the approved requirements.