CPE 135A
Grade · default condition
ASTM D6100 · GB GB/T 3830
135A = cPE-135A
Pick this 35% chlorine, high-molecular-weight amorphous type as the general impact modifier for PVC profiles, pipe and sheet, where the low-temperature impact gain is largest.
Values for the 135A condition
Other CPE grades and fills
CPE is listed in 9 conditions; see the grade overview at CPE.
Compare all 9 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
135ADefaultThis page CPE-135A | Pick this 35% chlorine, high-molecular-weight amorphous type as the general impact modifier for PVC profiles, pipe and sheet, where the low-temperature impact gain is largest. | — | 8 | 700 | 18 Shore D |
CPE-25/30 | Pick the low-chlorine 25–30% semi-crystalline type to toughen PE/PP and act as a flame-retardant synergist; retained PE crystallinity gives Shore D42 hardness and low elasticity. | 8 | 15 | 500 | 42 Shore D |
CPE-135B | Choose the 35% chlorine version with higher residual crystallinity when powder flow, anti-caking and fast dispersion govern high-speed mixing of PVC pipe and profile formulations. | — | 10 | 600 | 22 Shore D |
FR | Specify the Sb2O3/ATH flame-retardant cured jacket compound when UL 94 V-0, low smoke or high LOI is required; density rises to 1.5 g/cm³ and elongation drops to 250% at 105 °C. | — | 10 | 250 | 30 Shore D |
/ | Choose the carbon-black and hindered-amine stabilized weathering grade for roofing waterproof sheet and geomembrane, where the stabilizer package suppresses HCl loss and photo-ageing. | — | 11 | 350 | 25 Shore D |
CPE-140B | Use the 40–42% chlorine type for flame-retardant cable compounds and flexible blends needing better PVC compatibility, oil and fire resistance; low-temperature performance falls off. | — | 12 | 450 | 28 Shore D |
CM Shore A60 | Choose the peroxide- or thiadiazole-cured Shore A60 compound for soft cable jackets, hose and membranes that must stay flexible in cold weather outdoors, at 12 MPa and 125 °C service. | — | 12 | 420 | 14 Shore D |
CM Shore A70 | Use this Shore A70 cured compound as the default balance of mechanical properties and oil resistance for automotive hose, gaskets and waterproofing sheet, at 14 MPa and 350% elongation. | — | 14 | 350 | 22 Shore D |
CM Shore A80 | Pick the highly filled, hard Shore A80 cured compound for abrasion-resistant linings, roll covers and stiff jackets; elongation drops to 280% at 16 MPa tensile. | — | 16 | 280 | 30 Shore D |
What is CPE 135A?
CPE 135A is CPE in the 135A grade — pick this 35% chlorine, high-molecular-weight amorphous type as the general impact modifier for PVC profiles, pipe and sheet, where the low-temperature impact gain is largest. CPE 135A has a tensile strength of 8 MPa (1.16 ksi), weaker than 81% of polymer grades. Elongation at break is 700% and the elastic modulus is 0.02 GPa (0.0029 Msi). CPE 135A has a density of 1.16 g/cm³ (0.0419 lb/in³), lighter than 55% of polymer grades. Its glass-transition temperature is -20°C (-4 °F).
Advantages
- Ductile — tolerates forming and impact — 700%, better than 96% of polymer grades
- Forms and bends easily — 90/100, better than 91% of polymer grades
- Good UV / weathering resistance — 88/100, better than 90% of polymer grades
- Low embodied carbon — 2.8 kg CO₂/kg, better than 86% of polymer grades
- Low moisture uptake — 0.1%, better than 77% of polymer grades
Limitations
- Hard to polish — 20/100, worse than 95% of polymer grades
- Difficult to machine — 25/100, worse than 93% of polymer grades
- Low stiffness — 0.02 GPa (0.0029 Msi), worse than 75% of polymer grades
- High mold shrinkage — 1.9%, worse than 75% of polymer grades
CPE 135A properties
Typical room-temperature values for CPE 135A; 18 are specific to this condition. Other listed values are CPE reference data and may not represent this condition. Bars are the position among polymer grades.
Physical3
CPE 135A has a density of 1.16 g/cm³ (0.0419 lb/in³), lighter than 55% of polymer grades. Its glass-transition temperature is -20°C (-4 °F).
Mechanical8
CPE 135A has a tensile strength of 8 MPa (1.16 ksi), weaker than 81% of polymer grades. Elongation at break is 700% and the elastic modulus is 0.02 GPa (0.0029 Msi).
Thermal8
CPE 135A is rated for continuous service to 120°C (248 °F). It conducts heat at 0.2 W/m·K (0.116 BTU/hr·ft·°F), worse than 56% of polymer grades. Thermal expansion is 170 µm/m·K (94.4 µin/in·°F).
Electrical5
CPE 135A is an electrical insulator with a dielectric strength of 22 kV/mm (558.8 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 65% of polymer grades. UV resistance is excellent.
Sustainability3
Producing a kilogram of CPE 135A takes about 75 MJ of energy and emits 2.8 kg of CO₂ — less than 91% of polymer grades. Typical recycled content is 0%.
Manufacturability7
CPE 135A's machinability is poor (25/100, worse than 93% of polymer grades); weldability very good (70/100); formability excellent (90/100).
Common Calculations4
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CPE 135A
Is CPE easy to machine?
Vulcanised sheet is die-cut with sharp steel-rule dies or cut on a low-speed bandsaw, with cooling and rigid clamping to stop the stock stretching. Conventional metal-cutting processes do not apply.
Can CPE be welded?
Unvulcanised CPE sheet can be hot-air, hot-wedge or high-frequency welded, as is normal on waterproofing membrane; once vulcanised, joints must be adhesive lap bonds.
Can CPE be formed, bent or molded?
As a modifier it is dry-blended with PVC in a high-speed mixer and extruded at 160-190 C melt temperature. Rubber grades are compounded on a two-roll mill or in an internal mixer and cured with peroxide or thiadiazole systems at 160-180 C mould temperature; vent the tool to release HCl.
What surface finishes work on CPE?
Surfaces can be embossed, coated or printed. Clean with isopropyl alcohol and apply a chlorinated-rubber or polyurethane primer before bonding; the material cannot be plated.
CPE chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| chlorine (bound Cl)random chlorination sets crystallinity; 135A/B ≈35 %, 140 ≈40–42 % | 25 – 45 | 35 |
| residual crystallinityby DSC, %; one basis of GB/T 3830 classification | 0 – 15 | 3 |
| heat stabilizer / anti-caking (Ca-Zn, epadded to prevent powder caking and HCl release | 0.2 – 3 | 1 |
| volatiles (moisture)GB/T 3830 volatiles maximum | 0 – 0.5 | 0.3 |
| polyethylene (HDPE) backboneHDPE base; residual crystallinity approaches 0 as Cl rises | balance | — |
CPE 135A — frequently asked
What is CPE 135A used for?
CPE 135A is typically used for PVC impact modifier, cable jacketing, flexible hose and roofing membrane and rubber blending. In short: standard rigid-PVC impact modifier; weather- and oil-resistant PE rubber; elastomer without cross-linked PE cost.
What is the tensile strength of CPE 135A?
CPE 135A has a typical tensile strength of 8 MPa (1.16 ksi) — weaker than 81% of polymer grades. Strength varies by condition: see the 9 listed tempers.
Is CPE 135A easy to machine?
Not especially — machinability is rated poor (25/100, worse than 93% of polymer grades). Vulcanised sheet is die-cut with sharp steel-rule dies or cut on a low-speed bandsaw, with cooling and rigid clamping to stop the stock stretching. Conventional metal-cutting processes do not apply.
Can CPE 135A be welded?
Yes — weldability is rated very good (70/100). Unvulcanised CPE sheet can be hot-air, hot-wedge or high-frequency welded, as is normal on waterproofing membrane; once vulcanised, joints must be adhesive lap bonds.
What surface finishes work on CPE 135A?
Surfaces can be embossed, coated or printed. Clean with isopropyl alcohol and apply a chlorinated-rubber or polyurethane primer before bonding; the material cannot be plated.
Can CPE 135A be formed, bent or molded?
As a modifier it is dry-blended with PVC in a high-speed mixer and extruded at 160-190 C melt temperature. Rubber grades are compounded on a two-roll mill or in an internal mixer and cured with peroxide or thiadiazole systems at 160-180 C mould temperature; vent the tool to release HCl.
What is the maximum service temperature of CPE 135A?
CPE 135A is rated for continuous use to about 120°C (248 °F), and briefly to 150°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between CPE 135A and CPE-30?
135A is the default condition — pick this 35% chlorine, high-molecular-weight amorphous type as the general impact modifier for PVC profiles, pipe and sheet, where the low-temperature impact gain is largest. CPE-30: pick the low-chlorine 25–30% semi-crystalline type to toughen PE/PP and act as a flame-retardant synergist; retained PE crystallinity gives Shore D42 hardness and low elasticity.
Sources
- ASTM D1418 Standard Practice for Rubber and Rubber Latices—Nomenclature (CM) — ASTM (2022)
- Tyrin CM chlorinated polyethylene elastomer — properties and compounding guide — Dow / Trinseo (2020)
- Engineered Materials Handbook Vol.2: Engineering Plastics / Rubber chapters — ASM International (1988)
- CPE-135A/135B/140B (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.