The material buffer performance test for urban outdoor children's seats is critical for ensuring safety and durability in public playgrounds. This evaluation primarily follows international standards such as ASTM F1917 (Standard Safety Performance Specification for Playground Equipment for Public Use) and EN 1176 (European Standard for Playground Equipment). Key test methods include:
1. Impact Absorption Test: A hemispherical impactor (typically 6.7 kg) is dropped from specified heights (e.g., 100 mm to 1000 mm) onto seat materials. The measured G-force must not exceed 200g (acceleration of gravity) to prevent traumatic injuries.
2. Compression Resistance Test: Materials undergo cyclic loading (5000+ cycles at 1500N force) to simulate long-term use. Deformation should be ≤5% after recovery period.
3. Environmental Simulation: Samples are subjected to UV exposure (1000 hours per ASTM G154), temperature cycling (-40°C to 60°C), and water immersion to test degradation effects on buffer performance.
4. Hardness Measurement: Using Type A durometer (ASTM D2240), materials should maintain 50-70 Shore A to balance comfort and impact resistance.
Test results must demonstrate consistent energy absorption (60-80% impact reduction) and permanent deformation resistance. Compliance with these standards ensures seats provide adequate protection while withstanding urban outdoor conditions like rain, temperature extremes, and prolonged UV exposure. Regular retesting every 12-24 months is recommended for maintained safety certification.