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Product Summary
Model: DR-J802 | Test Type: Dynamic Fatigue — Constant-Load Pounding | Standards: ASTM D3574 I3 / ISO 3385 / GB/T 18941
Force Range: 10–750 N (Adjustable) | Cycle Frequency: 30–120 CPM | Max Cycles: 999,999
Warranty: 12 Months | Lead Time: 15–20 Working Days | Price Range: $3,500 – $5,500
DR-J802 Foam Dynamic Fatigue Tester — Repeated Compression Durability Testing
10–750 N adjustable force | ASTM D3574 I3 & ISO 3385 | Servo drive | ≤65 dB
Every foam cushion, mattress, and automotive seat will be compressed, released, and compressed again hundreds of thousands of times during its service life. The question is: how much of its original thickness and hardness does it retain after 80,000 cycles? The Derui DR-J802 foam dynamic fatigue tester answers that question with repeatable, standards-compliant constant-load pounding tests per ASTM D3574 I3 and ISO 3385 — giving you quantitative data on thickness loss and hardness reduction before your foam ever reaches the customer.
Key Takeaways
- The DR-J802 performs constant-load pounding fatigue tests at 10–750 N force, 30–120 CPM frequency, and up to 999,999 programmable cycles — covering ASTM D3574 I3 and ISO 3385 with room to spare.
- Dual-standard compliance (ASTM D3574 I3, ISO 3385, GB/T 18941) means the same machine serves foam manufacturers exporting to North America, Europe, and China.
- The machine measures two critical degradation metrics: thickness loss (%) and hardness reduction (ΔIFD) — both essential for predicting real-world foam service life.
- Interchangeable indenters (25 mm, 50 mm, 75 mm) and 1–2 station options allow flexible throughput for production QC.
- A PLC touch-screen with auto cycle counting, USB data export, and noise-reduction design makes the DR-J802 suitable for continuous 19-hour fatigue runs.
What Is a Foam Dynamic Fatigue Tester?
A foam dynamic fatigue tester repeatedly compresses foam specimens under a constant load to simulate cumulative mechanical stress during actual use. The test produces two critical data points: thickness loss — how much the foam’s original height is permanently reduced — and hardness reduction — how much the IFD value drops, indicating loss of load-bearing capacity.
Constant-Load vs Constant-Stroke Fatigue
| Type | Controlled Variable | Application |
|---|---|---|
| Constant-load pounding | Force held constant; stroke varies with degradation | ISO 3385, ASTM D3574 I3 — closest to real-world wear |
| Constant-stroke fatigue | Displacement fixed; force varies | Simplified QC checks |
The DR-J802 uses constant-load pounding, which more accurately simulates real-world conditions — a seated person’s body weight doesn’t change as the foam degrades.
Why Dynamic Fatigue Testing Matters
Without dynamic fatigue testing, you’re essentially guessing how your foam will perform after six months of use. A foam formulation might pass initial IFD hardness checks, yet collapse after 10,000 compression cycles in the field.
Mini Story: A furniture factory in Guangdong received a large order of sofa cushions from a Scandinavian retailer. Initial IFD readings looked fine — 180 N at 40% deflection. But the factory had no dynamic fatigue testing. Six months later, returns started arriving: cushions had lost 22% of original thickness. The retailer cancelled the contract. A simple 19-hour fatigue test on a DR-J802 would have revealed that the foam formulation’s cell structure collapsed under sustained cycling. The factory now runs fatigue testing on every new formulation before scale-up.
Key Features of the DR-J802
PLC Touch-Screen with Programmable Cycles (1–999,999)
The 7-inch touch-screen PLC allows operators to select test standards, set cycles, program force and frequency, and view real-time data. The software automatically manages the Phase 1/2/3 sequence per ISO 3385.
Adjustable Pounding Force (10–750 N) & Frequency (30–120 CPM)
| Parameter | DR-J802 Range | ISO 3385 | ASTM D3574 I3 |
|---|---|---|---|
| Force | 10–750 N (adjustable) | 750 N (fixed) | 750 N ±20 N |
| Frequency | 30–120 CPM (adjustable) | 70 ±5 CPM | 70 CPM (1.17 Hz) |
| Max Cycles | 999,999 | 80,000 | 8K/80K/12K (3 programs) |
Multiple Indenter Sizes & Multi-Station Option
Ships with 250 mm (ISO 3385), plus 75 mm and 50 mm interchangeable indenters. Optional 2-station configuration allows simultaneous testing of two specimens — doubling throughput for production QC.
Auto Cycle Counting, Test Termination & Noise Reduction
Runs unattended overnight for 80,000-cycle tests (~19 hours). Fault detection with safe pause. Servo motor drive keeps noise at ≤65 dB(A) — quieter than pneumatic systems. USB data export in CSV format.
Technical Specifications
| Parameter | Specification |
|---|---|
| Force Range | 10–750 N (adjustable) |
| Force Accuracy | ±1% of reading |
| Force Resolution | 0.1 N |
| Cycle Frequency | 30–120 CPM (adjustable) |
| Max Cycle Count | 999,999 (programmable) |
| Indenter Diameter (Standard) | 250 mm (ISO 3385 compliant) |
| Additional Indenters | 75 mm, 50 mm (interchangeable) |
| Specimen Size (Max) | 380 × 380 × 50 mm |
| Test Stations | 1 (2-station optional) |
| Control System | PLC + 7-inch color touch screen |
| Pre-loaded Standards | ASTM D3574 I3, ISO 3385, GB/T 18941 |
| Data Export | USB flash drive (CSV format) |
| Display Metrics | Force, cycle count, elapsed time, pass/fail |
| Drive System | Servo motor (brushless, sealed) |
| Noise Level | ≤65 dB(A) at 70 CPM / 750 N |
| Dimensions (W×D×H) | 750 × 650 × 900 mm |
| Weight | 120 kg |
| Power Supply | 220 V / 50 Hz (110 V / 60 Hz optional) |
| Power Consumption | 600 W |
| Warranty | 12 months (extended available) |
Standards Compliance
ASTM D3574 Test I3 — Dynamic Fatigue
Three program options: Program A (8,000 cycles, ~2 hrs), Program B (80,000 cycles, ~19 hrs), Program C (12,000 cycles, ~20 hrs for viscoelastic foams). Loading force: 750 N ± 20 N. Frequency: 70 CPM. Specimen: 380 × 380 × 50 mm. The DR-J802 supports all three programs.
ISO 3385 — Fatigue by Constant-Load Pounding
Phase 1: Initial measurement (thickness + IFD) under 5 N preload. Phase 2: 80,000 cycles at 750 N / 70 CPM. Recovery: 10 ± 5 min. Phase 3: Final measurement. Reports thickness loss % and hardness reduction.
GB/T 18941 — Chinese Standard
Equivalent to ISO 3385. Required for foam products in the Chinese domestic market. Pre-loaded in the DR-J802.
Applicable Testing Standards
| Standard | Scope | Key Tests |
|---|---|---|
| ASTM D3574 I3 | Flexible cellular materials — urethane foams | Constant-load pounding at 750 N, 70 CPM; 8K/80K/12K cycle programs |
| ISO 3385 | Flexible cellular materials — fatigue by pounding | Phase 1/2/3: 80,000 cycles at 750 N, 70 CPM; thickness + IFD measurement |
| GB/T 18941 | Flexible cellular materials — fatigue determination | Identical to ISO 3385; China certification |
Applications
PU foam manufacturers (R&D formulation development, batch release testing), furniture and mattress producers (incoming foam durability verification), automotive seating suppliers (OEM fatigue compliance), and third-party testing laboratories (ISO 3385 / ASTM D3574 I3 certification).
Why Choose Derui DR-J802?
Adjustable Parameters Beat Fixed-Force Competitors. The DR-J802’s 10–750 N adjustable range handles everything from lightweight packaging foams to high-density automotive seat pads.
Multi-Standard Coverage Without Upgrades. Ships with ASTM D3574 I3, ISO 3385, and GB/T 18941 pre-loaded. No paid upgrades, no software licenses.
Multi-Station Option for Higher Throughput. Optional 2-station configuration doubles testing throughput for production QC labs.
Mini Story: A third-party testing lab in Shanghai had been outsourcing foam fatigue testing because their pneumatic fatigue tester kept failing after 30,000 cycles — the air compressor couldn’t maintain consistent pressure. They replaced it with a DR-J802. In the first six months, the machine ran over 60 complete 80,000-cycle tests without a single fault. The lab’s QS manager: “The servo motor system is night-and-day compared to pneumatic. We set it Friday afternoon, and it’s finished Monday morning. No compressed air, no pressure drops, no false stops.”
Frequently Asked Questions
How many cycles does ISO 3385 require?
ISO 3385 specifies 80,000 cycles at 70 ± 5 CPM (~19 hours of continuous operation). ASTM D3574 I3 offers three programs: 8,000 (2 hrs), 80,000 (19 hrs), and 12,000 cycles (20 hrs).
What is the difference between constant-load and constant-stroke fatigue?
In constant-load pounding, the machine applies the same force on every cycle — as the foam softens, the indenter travels further to maintain that force. Constant-load more accurately simulates real-world seating. The DR-J802 uses constant-load pounding.
How does fatigue test data correlate with real-world lifespan?
80,000 cycles roughly corresponds to 2–5 years of residential seating use or 1–2 years of automotive seating use. Thickness loss >15% or hardness reduction >25% indicates the formulation needs optimization.
Can the DR-J802 test multiple samples at once?
Standard configuration is single-station. An optional 2-station configuration is available for simultaneous testing of two specimens.
What data does the DR-J802 export?
CSV file with specimen ID, test standard, initial/final thickness, initial/final IFD, thickness loss (mm and %), hardness reduction (N and %), cycle count, date/time, and pass/fail status.
What is the warranty and expected service life?
12-month standard warranty. Servo motor and PLC rated for minimum 10 years of typical use (est. 1,000–2,000 tests/year). Extended warranty up to 36 months available.
Contact Derui’s foam testing team for current pricing, configuration options, and lead time.
