|
Parameter |
Technical Standard / Range |
Test Method |
|
Polymer Base |
100% Virgin Natural Rubber (cis-1,4-polyisoprene) |
ASTM D297 |
|
Hardness Range |
40 to 80 Shore A (plus or minus 5 tolerance) |
ASTM D2240 |
|
Tensile Strength |
15 MPa to 25 MPa |
ASTM D412 |
|
Elongation at Break |
400% to 700% |
ASTM D412 |
|
Tear Resistance |
40 kN/m to 60 kN/m |
ASTM D624 (Die C) |
|
Specific Gravity |
1.10 to 1.25 g/cm3 |
ASTM D792 |
|
Temperature Range |
-40C to +80C (Continuous) / +100C (Intermittent) |
ASTM D573 |
|
Standard Thickness |
1.0 mm to 50 mm (Rolls or Sheets) |
ISO 3302-1 Class M |
The compound utilizes raw natural rubber reinforced with active carbon black or mineral fillers, combined with sulfur cure systems and antidegradants.
Polymer Integrity:
High raw polymer content ensures maximum resilience and minimal permanent deformation under heavy load cycles.
Curing System:
Sulfur vulcanization establishes cross-link densities calibrated for tensile strength rather than high-heat endurance.
Environmental Additives:
Wax blends and amine-based antioxidants are integrated to mitigate surface oxidation and ozone degradation during storage and initial deployment.
Ply Reinforcement: Available in unreinforced solid elastomer or single/multi-ply cotton/synthetic fabric insertions (EPDM or nylon duck) to restrict elongation and increase bolt-holding strength in flanged connections.
Surface Finish: Smooth plate finish on both sides, or fabric-impression finish on one side to optimize adhesive bonding surfaces for secondary lamination.
Dimensional Uniformity: Calibrated through precision calendering lines to maintain strict thickness tolerances across full roll lengths.
Resilience:
Rebounds rapidly after mechanical deflection, returning over 70% of impact energy.
Abrasion Resistance:
Exhibits low volume loss (typically less than 100 mm3) in DIN 53516 tests against sharp-edged aggregate and mineral slurries.
Low-Temperature Flexibility:
Retains elasticity down to -40C without micro-fissuring under dynamic bending.
Chemical Limitations:
Degrades rapidly upon contact with petroleum oils, greases, non-polar solvents, and sustained direct sunlight (UV/ozone exposure).
Hardness Grades:
40, 50, 60, 70, and 80 Shore A.
Form Factors:
Continuous rolls (widths up to 2000 mm), cut-to-size sheets, die-cut gaskets, and waterjet-cut profiles.
Color Portfolio:
Standard industrial black, red/tan gum rubber (high purity, 40-50 Shore A), and custom color matching for specific OEM identification.
Backing Options:
Pressure-sensitive adhesive (PSA) backing applied to one side for mechanical positioning during assembly.
Production executes via controlled batch processing to ensure compound homogeneity.
Internal Mixing: Raw polymer, fillers, and vulcanizing agents undergo mastication and dispersion in a 270-liter Banbury mixer.
Calendering: Mixed compound feeds through a 4-roll precision calender to gauge thickness down to sub-millimeter tolerances.
Curing (Vulcanization): Sheeting passes through a continuous rotary drum curing press (Rotocure) under regulated thermal and pressure parameters to complete cross-linking.
Post-Curing Inspection: Material cools, undergoes continuous thickness gauge scanning, and receives visual defect checks prior to trimming and rolling.
Mining & Mineral Processing:
Impact-absorbing wear liners used in 500t ore-transfer chutes, transfer points, and aggregate hoppers to resist sharp mineral abrasion.
Heavy Mechanical Engineering:
High-load vibration damping pads placed beneath industrial stamping presses, large centrifugal pumps, and heavy-duty generators.
Conveyor Systems:
Durable skirting rubber strips installed along conveyor belt edges to contain fugitive dust and fine particulate spillage in high-speed bulk material handling.
Marine & Infrastructure:
Impact-resistant dock bumpers and protective marine fendering elements absorbing high kinetic dock-collision energy.
Standards & Quality Control
Batch Testing:
Every production batch undergoes destructive testing for tensile strength, elongation, and durometer hardness per ASTM standards.
Inspection Protocols:
Dimensional verification occurs at 100-meter intervals along the roll length.
Compliance Documentation:
Material Test Reports (MTR) and Certificates of Analysis (CoA) ship with every production lot, traceable via batch numbers stamped on core tubes.
Production lines support custom configurations based on specific mechanical prints or sample parts.
Custom Formulations: Tailored compounds adjusted for specific tear resistance or lower hardness profiles.
Dimensional Tolerances: Precision-cut widths and thicknesses machined to ISO 3302-1 precision classes.
Prototyping: Small-batch trial runs for engineering validation prior to full-scale manufacturing commitments.
Roll Packaging: Wound onto rigid cardboard core tubes, wrapped in moisture-resistant polyethylene film, and secured with heavy-duty strapping.
Palletization: Fumigated wooden pallets or export-compliant plywood crates designed for containerized ocean or air freight.
Storage Recommendations: Store indoors between 15C and 25C, away from direct sunlight, fluorescent lighting, and ozone-generating electrical equipment.
Specify your required thickness, width, length, durometer hardness, and estimated annual volume to receive a formal quotation with applicable technical data sheets.
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