CPE-30
Grade
ASTM D6100 · GB GB/T 3830
CPE-30 = 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.
Values for the CPE-30 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 |
|---|---|---|---|---|---|
135ADefault 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-30This page 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-30?
CPE-30 is CPE in the CPE-30 grade — 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. CPE-30 has a tensile strength of 15 MPa (2.18 ksi), weaker than 74% of polymer grades. Elongation at break is 500% and the elastic modulus is 0.15 GPa (0.0218 Msi). CPE-30 has a density of 1.09 g/cm³ (0.0394 lb/in³), lighter than 66% of polymer grades. Its glass-transition temperature is -20°C (-4 °F). 135A is the default condition FabDigit quotes; CPE-30 is available on request or by drawing note.
Advantages
- Forms and bends easily — 90/100, better than 91% of polymer grades
- Ductile — tolerates forming and impact — 500%, better than 90% 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
- Readily welded — 75/100, better than 82% of polymer grades
Limitations
- Hard to polish — 20/100, worse than 95% of polymer grades
- High mold shrinkage — 2.2%, worse than 87% of polymer grades
- Difficult to machine — 35/100, worse than 84% of polymer grades
CPE-30 properties
Typical room-temperature values for CPE-30; 25 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-30 has a density of 1.09 g/cm³ (0.0394 lb/in³), lighter than 66% of polymer grades. Its glass-transition temperature is -20°C (-4 °F).
Mechanical8
CPE-30 has a tensile strength of 15 MPa (2.18 ksi), weaker than 74% of polymer grades. Elongation at break is 500% and the elastic modulus is 0.15 GPa (0.0218 Msi).
Thermal8
CPE-30 is rated for continuous service to 90°C (194 °F). It conducts heat at 0.25 W/m·K (0.144 BTU/hr·ft·°F), better than 72% of polymer grades. Thermal expansion is 170 µm/m·K (94.4 µin/in·°F).
Electrical5
CPE-30 is an electrical insulator with a dielectric strength of 22 kV/mm (558.8 V/mil) and a resistivity of 1×10¹³ Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (82/100), better than 56% of polymer grades. UV resistance is excellent.
Sustainability3
Producing a kilogram of CPE-30 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-30's machinability is fair (35/100, worse than 84% of polymer grades); weldability very good (75/100); formability excellent (90/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with CPE-30
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-30 — frequently asked
What is CPE-30 used for?
CPE-30 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-30?
CPE-30 has a typical tensile strength of 15 MPa (2.18 ksi) — weaker than 74% of polymer grades. Strength varies by condition: see the 9 listed tempers.
Is CPE-30 easy to machine?
Not especially — machinability is rated fair (35/100, worse than 84% 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-30 be welded?
Yes — weldability is rated very good (75/100). 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-30?
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-30 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-30?
CPE-30 is rated for continuous use to about 90°C (194 °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.