MT 668-2008
Flame-resistant steel cord conveyor belt reference for coal mining. Supplied comparison data includes surface resistance up to 300 MOhm and maximum drum surface temperature of 325 C.
Steel Cord Conveyor Belt
MT668
Steel Cord Belt
For Coal Mining
MT668-2008 · Flame Retardant & Anti-Static
Engineered for the harshest underground coal mining environments. The MT668 delivers exceptional tensile strength up to ST-5400 N/mm, with flame-retardant and anti-static performance requirements selected for the applicable project standard — keeping your operation moving safely, shift after shift.
ST-5400
Max Rating
MT668
Standard
15 MPa
Tensile Strength
FR/AS
Certified
MT668-2008 Reference
Flame Retardant & Anti-Static
ST-630 to ST-5400 Available
Underground Coal Mining Grade
ISO 9001 Quality Assured
Factory Direct Supply
MT668-2008 Reference
Flame Retardant & Anti-Static
ST-630 to ST-5400 Available
Underground Coal Mining Grade
ISO 9001 Quality Assured
Factory Direct Supply
Application
Built for
Underground
The MT668 steel cord conveyor belt is flame retardant and anti-static, purpose-built for underground coal mine applications where safety regulations demand the highest levels of fire suppression and electrical discharge control.
Its superior steel cord carcass enables long-distance, high-capacity transport of lump and granulate coal — even under the demanding conditions of deep underground heavy-duty operations where standard belts fail prematurely.
- Underground longwall and room-and-pillar coal mining operations
- Long-distance, high-inclination coal transportation systems
- High-capacity bulk material handling based on the engineered conveyor design
- Main gate and tail gate conveyor installations in gassy mines
MT668
Coal Mine
Certified
Certified
Not sure which belt rating fits your conveyor system? Our engineers are standing by to match the right MT668 specification to your exact mine layout.
Talk to an EngineerSAFETY STANDARDS & COMPLIANCE
SELECT THE REQUIRED UNDERGROUND SAFETY REFERENCE
MT 668-2008, GB 21352-2008 and EN 14973 C1 are separate technical references. The required edition, approval scope and laboratory testing must be confirmed for each mine and jurisdiction.
GB 21352-2008
Reference for flame-resistant steel cord conveyor belts used in underground mines, with its own test and approval framework.
EN 14973 C1
Safety category for restricted escape conditions where explosive gas, combustible conveyed material or dust may be present and no auxiliary safety system is provided.
These references are not represented as equivalent certifications. Confirm the applicable current standard and required third-party evidence before ordering.
Product Structure
4-Layer Construction
The MT668 steel cord conveyor belt consists of four precisely engineered layers, each contributing to its exceptional longevity and underground safety performance. This multi-layer architecture delivers the tensile strength of steel with the flexibility needed for troughed conveyor systems.
1
Top Cover Rubber
Flame retardant, anti-static compound. Primary wear surface rated for heavy coal impact loads.
2
Skim Rubber Layer
Bonding interface between cover and steel cord carcass. Ensures maximum adhesion under dynamic load cycling.
3
Steel Cord Carcass
High-tensile galvanized steel cords, precisely pitched for uniform load distribution across full belt width.
4
Bottom Cover Rubber
Anti-static compound resists drum and idler abrasion while dissipating static electrical charge safely.
Steel Cord Cross-Section — MT668 Construction
Need custom cover thickness, width, or special compound formulations? JOYTRANS engineers can configure the MT668 to your exact operational parameters.
Request Custom ConfigurationBENEFITS
Product Benefits
Why Choose MT668
High Strength
High Strength
Steel cord carcass delivers tensile ratings from ST-630 to ST-5400 N/mm — providing structural capacity to handle long-distance transport.
Resilience
Good Resilience
Precision vulcanization creates a rubber matrix that absorbs repeated impact without fatigue.
Flexibility
Good Flexibility
Optimised cord pitch geometry ensures a stable trough on 20°, 35°, and 45° idler sets — increasing volumetric capacity.
Impact Resist.
Impact Resistance
Engineered cover rubber absorbs high-energy impact at loading points, preventing cord damage and puncture.
Abrasion Resist.
Abrasion Resistance
Cover abrasion ≤ 200 mm³ per MT668-2008 specification. Superior wear resistance translates directly into extended belt life.
Adhesion
Low Elongation
Cover-to-cord separation strength ≥ 10 N/mm holds structure intact. Low elongation keeps splice tension predictable.
Flame Retardant (FR) Certified
Anti-Static (AS) Certified
Electrical Conductivity ≤ 3 × 10⁶ Ω
Ready to put the MT668's performance advantage to work in your mine? Contact JOYTRANS for a no-obligation engineering review and competitive factory pricing.
Request Factory PricingENGINEERING SELECTION
SELECT THE BELT AS A COMPLETE SYSTEM
Required conveyor data
- Capacity, belt speed and conveyed coal characteristics
- Conveyor length, lift height, inclination and trough angle
- Pulley diameters, take-up arrangement and splice requirements
Required belt construction
- ST rating, belt width and cord arrangement
- Top and bottom cover thickness and compound
- Safety standard, testing, inspection and documentation
Technical Data
Main Technical Indicators
Main Technical Indicators
Swipe horizontally to view the complete specification table.
| Belt Rating |
Belt Strength (N/mm) |
Cord Pitch (mm) |
Cord Diam (mm) |
Top / Bottom Cover Thickness (mm) |
Pulling Out Strength ≥ (N/mm) |
|
|---|---|---|---|---|---|---|
| Before Aging | After Aging | |||||
| ST-630 | 630 | 10 | 3.0 | 5+5 | 67 | 50 |
| ST-800 | 800 | 10 | 3.5 | 5+5 | 75 | 69 |
| ST-1000 | 1000 | 12 | 4.0 | 6+6 | 82 | 77 |
| ST-1250 | 1250 | 12 | 4.5 | 6+6 | 90 | 84 |
| ST-1600 | 1600 | 12 | 5.0 | 6+6 | 97 | 90 |
| ST-2000 | 2000 | 12 | 6.0 | 8+8 | 112 | 105 |
| ST-2500 | 2500 | 15 | 7.2 | 8+8 | 130 | 122 |
| ST-2800 | 2800 | 15 | 7.5 | 8+8 | 134 | 124 |
| ST-3150 | 3150 | 15 | 8.1 | 8+8 | 143 | 135 |
| ST-3500 | 3500 | 15 | 8.6 | 8+8 | 151 | 140 |
| ST-4000 | 4000 | 15 | 8.9 | 8+8 | 155 | 144 |
| ST-4500 | 4500 | 16 | 9.7 | 8+8 | 168 | 157 |
| ST-5000 | 5000 | 17 | 10.9 | 8.5+8.5 | 186 | 175 |
| ST-5400 | 5400 | 17 | 11.3 | 9+9 | 192 | 180 |
Grade & Performance Requirements
| Specification | Grade / Requirement |
|---|---|
| Tensile Strength MPa ≥ | 15 |
| Elongation at Break % ≥ | 350 |
| Abrasion mm³ ≤ | 200 |
| Tensile Strength & Elongation after Aging (70°C × 168h) | No less than 75% of values before aging |
| Separation Strength between Cover and Core Rubber ≥ N/mm | 10 |
| Electrical Conductivity Ω | ≤ 3 × 10⁶ Ω |
| Ignition S ≤ (with cover) | Aggregate of each set of 6 test pieces (with cover) shall be less than 18s; no individual result shall be greater than 10s |
| Ignition S ≤ (without cover) | Aggregate of each set of 6 test pieces (without cover) shall be less than 30s; no individual result shall be greater than 15s |
| Drum Friction °C ≤ | The temperature of drum surface shall be less than 325°C |
| Laboratory Scale Tunnel Test | The length of test pieces that remains undamaged shall be not less than 600mm across the whole width of the conveyor belt |
Have a specific belt rating, cover gauge, or width in mind? Get a factory-direct quotation with lead time and pricing within 24 hours.
QUALITY CONTROL & TEST EVIDENCE
DOCUMENTATION SHOULD MATCH THE ORDERED STANDARD
Material checks
Cover tensile strength, elongation, abrasion and cover-to-core adhesion.
Safety tests
Electrical resistance, burner test, drum friction and gallery flame-propagation testing as applicable.
Construction checks
Cord diameter, pitch, pull-out strength, belt thickness, width and finished-belt inspection.
Underground Coal Transport
Steel Cord Construction Detail
Heavy-Duty Mining Installation
The MT668 is available in standard ratings and project-specific constructions subject to technical review. Reach out now and receive a project-specific technical quotation from JOYTRANS.
Get Factory Quote — 24 hr ResponseTECHNICAL FAQ
MT668 SELECTION QUESTIONS
Is MT 668-2008 the same as EN 14973 C1?
No. They are separate references with different scopes and test frameworks. Specify the exact required standard and approval for the project.
Which ST rating should be selected?
The rating must be calculated from conveyor length, lift, capacity, belt speed, operating tension, safety factors and splice design. Use the table for reference, then confirm the engineered selection.
Can belt width and cover thickness be customized?
Yes, subject to engineering review, manufacturing capability and the required standard. Provide the conveyor and material data in the RFQ form.
What documents can be requested?
Request the applicable product specification, inspection plan, test documentation and manufacturing records required by the purchase contract.
ENGINEERING RFQ
REQUEST A TECHNICAL QUOTE
Provide the known conveyor and operating data. JOYTRANS will use it to review the belt rating, cover construction and required safety reference.