Mattress Spring Fatigue Tester，ASTM D3574 ，how to test mattress for sagging
The King Size Foam Fatigue Tester is a single-station pneumatic fatigue testing system designed for evaluating the long-term durability, compression resistance, and structural stability of full-size foam mattresses. The tester accommodates standard King and California King mattress sizes and applies controlled cyclic loading to simulate repetitive human use over an extended service life. The system supports both constant force and constant displacement loading modes and is suitable for laboratory-based durability evaluation and standard compliance testing.
Application
The King Size Foam Fatigue Tester is used for fatigue and durability evaluation of the following products:
Full foam mattresses (polyurethane foam, memory foam)
Latex mattresses
Hybrid mattresses (foam combined with spring or latex layers)
Mattress core foam blocks and assembled mattress systems
Large-size cushioning foam products
Mattress prototypes during product development
Production quality control and type testing of mattresses
Standards
The King Size Foam Fatigue Tester complies with or references the following standards:
ASTM D3574 – Dynamic Fatigue Test by Constant Force Pounding
ISO 2439 – Determination of indentation hardness and deflection
GB/T 26706 – General Technical Requirements for Mattresses (related clauses reference)
Parameters
| Parameter | Unit | Specification |
|---|---|---|
| Test Station | — | Single station |
| Applicable Mattress Size | — | King size, California King |
| Loading Method | — | Pneumatic |
| Loading Mode | — | Constant force / constant displacement |
| Maximum Test Frequency | cycles/min | ≤ 70 |
| Cylinder Stroke | in | 12 (customizable) |
| Indenter Diameter | mm | 250 |
| Load Measurement | — | Fatigue-rated load cell |
| Load Cell Capacity | lb | 500 |
| Positioning System | — | Manual X–Y gantry |
| Sample Retention | — | Four adjustable corner retainers |
| Control System | — | PLC with touchscreen interface |
| Air Supply Requirement | PSI | 80 |
| Power Supply | — | 120 VAC |
Features
Large test platform suitable for King and California King mattresses
Dual testing modes supporting constant force and constant displacement fatigue tests
Pneumatic loading system designed for high-cycle durability testing
Fatigue-rated load cell ensuring stable and repeatable dynamic load measurement
Manual X–Y gantry system allowing fatigue testing at any mattress location
Adjustable four-corner sample retainers for secure mattress positioning
High-frequency operation up to 70 cycles per minute to improve test efficiency
Touchscreen PLC control system for parameter setting, monitoring, and test control
Modular design supporting optional indenter sizes, stroke lengths, and load cell capacities
Accessories
Circular indenter, 250 mm diameter (ASTM D3574 compliant)
Pneumatic loading cylinder and air regulation components
Fatigue-rated load cell
Manual X–Y positioning gantry
Adjustable mattress corner retainers
PLC controller with touchscreen display
Compressed air connection components
Test Procedures
Place the mattress flat on the test platform
Adjust the four corner retainers to secure the mattress position
Select constant force or constant displacement test mode
Set test frequency, load or displacement value, and cycle count
Position the indenter using the X–Y gantry to the target test area
Start the fatigue test and allow the system to operate automatically
The system stops automatically upon reaching the preset cycle count
Remove the mattress after the indenter returns to the home position
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