Edge and corner testing

I. Core Purpose of Testing

II. Test Objects

• Children's products: toys, cribs, baby walkers, children's tables and chairs, etc.;

• Household items: tables and chairs, cabinets, door and window frames, kitchenware, etc.;

• Industrial/electronic equipment: appliance housings, mechanical equipment corners, tool handles, etc.;

• Medical devices: contact edges of medical beds, nursing equipment, etc.

III. Key Test Indicators

1. Edge Sharpness:

• Inspect edges for burrs, sharp edges, flash, etc. (e.g., burrs on metal parts after cutting, flash on plastic parts after injection molding);

• Core criterion: whether the edge is sufficiently smooth and whether it can cause skin laceration (typically verified using a "sharp edge tester"; if the tester tape is cut by the edge, the edge is determined to be a "sharp edge" and non-compliant).

2. Corner Curvature Radius:

• Assess the roundness of corners; the smaller the curvature radius (the sharper the corner), the higher the risk;

• Standards generally require corners to have sufficiently large radii (e.g., children's toy corner curvature radius ≥1 mm, furniture corners ≥2 mm; specifics depend on product category and standard).

3. Effectiveness of Protective Measures:

• If product edges/corners incorporate protective design (such as edge binding, rounding treatment, soft rubber wrapping), test whether the protective layer is secure, effectively covers sharp edges, and avoids exposing hazards after detachment or failure.

IV. Common Test Tools and Methods

1. Sharp Edge Tester:

• Used to detect whether an edge is a "hazardous sharp edge"; consists of a standard-compliant tape (e.g., PTFE tape) and a handle.

• Test method: press the tape firmly against the edge and pull it at a specified speed and force; if the tape is cut or torn, the edge is determined to be a "sharp edge" that does not meet safety requirements.

2. Radius Gauge (Fillet Gauge):

• Used to measure the curvature radius of corners by comparing against standard radius templates to determine whether the corner meets the required roundness (e.g., children's toys must meet radius ≥1 mm; otherwise, it is classified as a "sharp corner").

3. Sensory and Physical Inspection:

• Supplementary inspection for burrs, protrusions, or whether protective layers (such as rubber, fabric) have detached or cracked.

V. Key Test Standards

• China: GB 6675.2-2014 Toy Safety - Part 2: Mechanical and Physical Properties (for toy edges and corners); GB 28007-2011 General Technical Requirements for Children's Furniture (edge and corner requirements for children's furniture).

• EU: EN 71-1 Safety of Toys - Part 1: Mechanical and Physical Properties; EN 12520 Furniture - Domestic Seating - Safety Requirements.

• United States: ASTM F963-17 Standard Consumer Safety Specification for Toy Safety; 16 CFR 1500.48/49 (federal regulations on sharp edges and sharp points for toys).

VI. Testing Process

1. Sample Preparation: Identify the edges and corners of the product to be tested (e.g., all exposed edges and accessible corners);

2. Tool Calibration: Calibrate tools such as the sharp edge tester and radius gauge according to standards (ensure accuracy);

3. Item-by-Item Testing:

• Use the sharp edge tester to check whether edges are sharp;

• Use the radius gauge to measure the corner curvature radius;

• Check whether protective measures are secure and effective;

4. Result Determination: Compare against standard requirements to determine compliance (e.g., "no sharp edges, corner radius ≥X mm" is compliant);

5. Remediation Recommendations: Propose optimization solutions for non-compliant areas (e.g., deburring sharp edges, increasing corner radii, adding protective covers, etc.).

Conclusion