MT668 Steel Cord Conveyor Belt For Coal Mining – JOYTRANS
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, combined with certified flame retardancy and anti-static properties — keeping your operation moving safely, shift after shift.

ST-5400
Max Rating
MT668
Standard
15 MPa
Tensile Strength
FR/AS
Certified
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MT668-2008 Certified Flame Retardant & Anti-Static ST-630 to ST-5400 Available Underground Coal Mining Grade ISO 9001 Quality Assured Factory Direct Supply MT668-2008 Certified 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 at 5,000+ tph throughput
  • Main gate and tail gate conveyor installations in gassy mines
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MT668 steel cord conveyor belt in underground coal mine
MT668
Coal Mine
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.

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Product Structure

Five-Layer Construction

The MT668 steel cord conveyor belt consists of five 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
Edge Rubber
Seals and protects steel cord ends from moisture, acid, and mechanical edge damage underground.
5
Bottom Cover Rubber
Anti-static compound resists drum and idler abrasion while dissipating static electrical charge safely.
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Steel cord conveyor belt cross-section
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.

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BENEFITS
Product Benefits
Why Choose MT668
High-strength steel cord carcass High Strength
High Strength
Steel cord carcass delivers tensile ratings from ST-630 to ST-5400 N/mm — providing the structural capacity to handle long-distance, high-load transport in deep coal mines without belt stretch or creep.
Rubber resilience manufacturing Resilience
Good Resilience
Precision vulcanization creates a rubber matrix that absorbs repeated impact without fatigue. The MT668 recovers its profile after heavy lump-coal drops, reducing idler damage and operating noise.
Conveyor belt trough profile Flexibility
Good Flexibility & Troughability
Optimised cord pitch geometry ensures a stable trough on 20°, 35°, and 45° idler sets — increasing volumetric capacity while maintaining smooth, low-power tracking performance throughout the system.
Heavy impact loading in mining Impact Resist.
Impact Resistance
Engineered cover rubber absorbs high-energy impact at loading points, preventing cord damage and puncture. This directly reduces unplanned belt change-outs and the costly downtime they cause underground.
Abrasion-resistant industrial surface Abrasion Resist.
High Abrasion Resistance
Cover abrasion ≤ 200 mm³ per MT668-2008 specification. Superior wear resistance translates directly into extended belt life — lowering your cost-per-tonne over the belt's full operational cycle.
Belt layer bonding process Adhesion
Excellent Adhesion & Low Elongation
Cover-to-cord separation strength ≥ 10 N/mm holds the structure intact under sustained dynamic tension. Low elongation keeps splice tension predictable and take-up travel minimal.
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.

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Technical Data

Main Technical Indicators

Implementation Standard MT668-2008 《Steel Cord Conveyor Belt For Coal Mining》
Main Technical Indicators
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.

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MT668 in coal mining application
Underground Coal Transport
Steel cord conveyor belt close-up
Steel Cord Construction Detail
Heavy-duty mining conveyor
Heavy-Duty Mining Installation

The MT668 is factory-stocked in standard ratings and available for custom orders. Reach out now and receive a no-obligation quotation from JOYTRANS within 24 hours.

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