SKW Engineers Reveal How to Spot Substandard Roofs in 10 Minutes (With Free Quality Checklist)
Test 1: The Magnet Betrayal – Steel Core Deception
▍Inferior Product Warning Signs
- 🧲 Strong magnetic attraction = Low-carbon steel (230-275MPa tensile strength)
- 🔴 Visible rust spots after 24hr salt spray test (ASTM B117)
- ⚖️ Weight fraud: Sand-filled glue increases weight by 15% but reduces durability
▍SKW Premium Standard
Steel Composition:
ZnAlMg alloy coating (AZ150)
Tensile strength: 550MPa
Salt spray resistance: 3000hrs (ISO 9227)
Magnetic response: Weak attraction
DIY testing method: Testing samples with magnets – Strong adsorption=Poor quality steel!
Test 2: Granule Adhesion Death Test
▍Industry Failure Threshold: ≤3.5kg/cm²
| Testing method | Poor quality tile results | SKW basalt tile results |
|---|---|---|
| Scrape the wire brush 50 times | >2.5g of crushed stone falls off | <0.1g falls off |
| Boiling water immersion | Water becomes turbid (glue dissolves) | Water quality is clear |
| QUV UV aging 2000hr | Δ E>8 (severe fading) | Δ E<2 (ISO 4892) |
Field Trick: Watering the sample with boiling water – water discoloration=glue failure!
Test 3: Locking System Warfare
Hurricane Simulation Laboratory Data (ASTM D7158)
┌───────────────┬───────────────┐
│ Poor quality lock buckle │ SKW hurricane lock buckle │
┌─────────────┼───────────────┼───────────────┤
│ 150km/h │ 5mm lift │ 0mm displacement │
├─────────────┼───────────────┼───────────────┤
│ 210km/h │ Catastrophic detachment │ 1.2mm elastic displacement │
└─────────────┴───────────────┴───────────────┘ Test 4: Thermal Betrayal – Infrared Exposes Truth
Florida sun exposure test (ambient temperature 45 ° C)
| Roof type | Surface temperature | Thermal conduction | Energy cost |
|---|---|---|---|
| Poor quality metal tiles | 78 ° C | Fast | Air conditioning cost+41% |
| SKW CoolRoof | 49 ° C | Barrier | Energy saving $220/year |
| Core technology: Ceramic microspheres in coatings reflect 89% infrared radiation |
Test 5: The Weight Scam
Density deception detection formula
Poor quality method : Adding quartz sand to the glue increases weight by 15% → brittleness increases by 300%
SKW standard: precise control 4.3kg/m ² ± 0.2kg
Test 6: The Sound Deception
Measured rainstorm noise (dB)
| Product type | Niveau sonore | Subjective perception |
|---|---|---|
| Poor quality colored stone tiles | 52 dB | “Iron sheet drumming” |
| SKW Silent Tile | 34 dB | “Gentle Rain Sound” |
| Noise reduction technology : 1.2mm acoustic foam backing+wave buffer |
Test 7: Edge Corrosion – The Silent Killer
Microscopic cutting edge analysis
graph LR
A [Original Edge Cutting] - Poor Quality Process ->B (Bare Steel Base)
A -- SKW laser edge banding -->C (ZnAlMg alloy self-healing)
Salt spray proof : Rust time after spraying with 3% salt solution:
-Poor quality product: 3 hours
-SKW: 300 hours+
SKW Global Quality Agreement
12th level inspection checklist (excerpt)
- Steel certification: requires EN 10346:2015 certificate
- Glue application amount: ≥ 280g/m ² epoxy resin
- Gravel composition: 70% basalt+30% ceramic particles
- Lock buckle strength:>750N pull-out resistance (UL 580 Class 4)
[Download the complete detection table]（ https://skwroof.com/download/)
Decryption of Global Failure Cases
| Location | Failure Mode | Root Cause | Solution SKW |
|---|---|---|---|
| Miami, USA | Hurricane debris falling off | Adhesive+No UV protection | StormLock+UV400 |
| Jeddah, Saudi Arabia | 70 ° C glue melting | Low Tg polymer | Ceramic modified adhesive |
| Osaka, Japan | 2-year edge corrosion | Unscented cutting | Laser edge sealing technology |
Consumer Fraud Prevention Guide
Five questions about purchasing soul:
1.Could you please provide a report on the thickness of the ZnAlMg coating on the steel? (Should be ≥ 20 μ m)
2.What is the Δ E value for QUV aging for 6000 hours? (Should be<3)
3.Can you view the video of the anti pull force test for the lock buckle? (requires>700N)
4.What is the sealing process for edge cutting? “(Refusing ordinary cutting)
5.Does the warranty include the shedding of crushed stones? “(Beware of word games)