|
Property |
Test Standard |
Typical Value / Range |
|
Polymer Base |
ASTM D1418 |
CSM (Chlorosulfonated Polyethylene) |
|
Durometer Hardness |
ASTM D2240 |
50 to 85 Shore A (+/- 5) |
|
Tensile Strength |
ASTM D412 |
12.0 to 20.0 MPa |
|
Elongation at Break |
ASTM D412 |
300% to 500% |
|
Temperature Range (Continuous) |
ASTM D573 |
-30 deg C to +120 deg C (Spikes to +150 deg C) |
|
Specific Gravity |
ASTM D792 |
1.15 to 1.35 g/cm3 |
|
Compression Set (22h at 70 deg C) |
ASTM D395 Method B |
25% to 40% |
|
Ozone Resistance (50 pphm, 40 deg C, 20% strain) |
ASTM D1149 |
No cracking after 500 hours |
Compound performance is dictated by base polymer selection and cross-linking chemistry. We utilize virgin CSM polymers matched with heavy-metal oxide cure systems (primarily litharge or magnesia) rather than standard sulfur systems, establishing stable carbon-carbon and ionic cross-link networks.
Chlorine Content:
Controlled strictly between 29% and 43% to balance low-temperature flexibility, chemical inertness, and flame retardancy.
Filler Matrix:
Reinforced with high-structure furnace blacks and precipitated silicas to control tear propagation and tensile modulus without sacrificing dynamic fatigue performance.
Plasticizer Integration:
Low-volatility ester and polymeric plasticizers prevent plasticizer migration and long-term durometer creep.
Calendered Sheets: Produced in smooth or fabric finishes, with options for single or multi-ply polyester and aramid reinforcement inserts to limit elongation under high operational loads.
Extruded Profiles: Solid and sponge-density configurations manufactured to tight cross-sectional tolerances for structural glazing gaskets, cable entry seals, and protective rub rails.
Molded Components: Custom-engineered parts produced via compression and transfer molding with optimized gate designs to eliminate internal knit lines and micro-voids.
Weather & UV Stability:
Chlorosulfonation creates a stable, saturated polymer backbone that prevents surface chalking, micro-fissuring, and mechanical embrittlement under continuous direct sunlight.
Fluid & Chemical Resistance:
Demonstrates low volumetric swell when exposed to mineral-based hydraulic oils, animal fats, concentrated alkalis, and inorganic acids.
Flame Retardancy:
High chlorine concentration imparts inherent self-extinguishing properties, complying with key industrial fire safety standards.
Dielectric Strength:
Maintains high electrical insulation performance, suitable for medium-voltage cable jackets and protective substation boots.
Durometer Spectrum:
Formulations adjustable from 50 Shore A (high compliance, soft seal) to 85 Shore A (rigid, structural load-bearing).
Color Capability:
Standard industrial black and white, with custom Pantone pigment matching available for safety coding or visual asset identification.
Surface Modification:
Post-cure surface chlorination or low-friction coatings applied to lower the coefficient of friction for automated assembly lines.
Adhesive Interlayers:
Pressure-sensitive adhesive (PSA) backings applied to flat strip profiles for positioning during installation.
Production follows a tightly monitored workflow to ensure absolute batch-to-batch repeatability:
Internal Banbury Mixing:
Polymers, fillers, and curatives are processed in automated internal mixers with real-time temperature and torque logging to verify uniform dispersion.
Calendering & Extrusion:
Mixed compounds pass through multi-roll calenders for precise gauge control (+/- 0.1 mm) or steel-machined extrusion dies.
Curing & Vulcanization:
Continuous vulcanization (CV) lines or multi-daylight hydraulic presses apply calibrated thermal and pressure cycles aligned with compound rheometer curves.
Post-Cure Thermal Stabilization:
High-performance compounds undergo secondary oven baking to drive off volatile residuals and stabilize final cross-link density.
Chemical Transfer Systems: Inner tube linings and protective covers for aggressive chemical hoses.
Waterproofing Membranes: Single-ply roofing sheets and flashing exposed to ponding water and constant solar radiation.
Marine Engineering: Fender facings, inflatable collar fabrics, and expansion joints resistant to salt-water immersion.
Electrical Infrastructure: Substation insulating gaskets, transformer seals, and high-voltage cable accessories.
Standards & Quality Control
Every production lot is audited against rigorous internal protocols and international standards before release.
Dimensional Verification:
Laser micrometers monitor extrusion cross-sections; manual vernier calipers and CMM equipment verify molded geometries.
Physical Testing:
In-house laboratory analysis verifies tensile strength, elongation, and durometer on every mixed batch.
Regulatory Compliance:
Raw materials comply with REACH and RoHS substance restrictions. A formal Certificate of Analysis (CoA) accompanies every shipment.
OEM & Custom Manufacturing
Engineering collaboration is available for custom part development. We accept standard CAD data formats (.STEP, .IGES) and 2D engineering drawings to review wall thickness transitions, draft angles, and parting line placement. Tooling production and prototype sample delivery are completed within 15 business days, backed by full dimensional inspection reports and material test sheets.
Roll Goods: Wound onto rigid cardboard cores, wrapped in moisture-barrier polyethylene film, and secured on fumigated wooden pallets or inside protective crated boxes to eliminate edge damage.
Profiles & Molded Parts: Packed in anti-static, moisture-sealed bags within heavy-duty double-wall corrugated cartons.
Logistics: Dispatched via air or ocean freight with complete export documentation, including packing lists, commercial invoices, and Certificates of Origin.
To initiate a technical review or request a commercial quotation, please share your 2D/3D drawings, estimated annual usage, required durometer, and operating environment parameters. Our engineering team responds within 24 hours with a comprehensive technical proposal and material data sheet.
We're well-known as one of the leading csm rubber manufacturers and suppliers in China. If you're going to buy good quality csm rubber, welcome to get more information from our factory.
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