High-Viscosity Extrusion Polyamide Examid PA6 R40

Description

Examid® PA6 R40 is a high-viscosity extrusion grade of polyamide 6. Designation: R40 — relative viscosity η_rel ≈ 4.0 in 96 % H₂SO₄ (significantly higher than standard injection PA6 with η_rel 2.7–3.3). High melt viscosity is critical for processes where the material must hold its shape after leaving the extruder until it fully cools and crystallizes — extrusion of profiles, monofilaments, pipes and sheet, as well as rotational molding (rotomoulding) of large hollow parts.

The high-molecular-weight structure of PA6 R40 provides increased strength, wear resistance and resistance to repeated flexing — the material does not crack under cyclic loading even after long-term service. It is the workhorse for serial production of engineering PA6 semi-finished products in Ukraine and Europe.

Typical parameters: density ~1.13 g/cm³, η_rel ≈ 4.0, MFR <8 g/10 min (low — normal for extrusion), tensile strength 75–80 MPa (dry), tensile modulus 2.8–3.0 GPa, elongation at break 30–80 %, Charpy notched impact strength 4–5 kJ/m² at 23 °C, Tm 220 °C, continuous service temperature up to 90 °C dry. UL 94 V-2 (standard).

Key advantages

• High melt viscosity (η_rel ≈ 4.0) — stable shape retention during extrusion, minimal sagging, stable profile dimensions along the length
• High molecular weight — increased resistance to fatigue deformation, wear and repeated flexing
• High mechanical strength and stiffness — above standard injection-grade PA6 thanks to the longer molecular chain
• Resistance to oils, gasoline, diesel and dilute alkalis
• Good abrasion resistance — for parts with surface contact and wear
• Processable by profile and pipe extrusion, rotomoulding and blow molding
• Basic flame resistance UL 94 V-2 (self-extinguishing)

Limitations

• UL 94 V-2 — not for FR-critical applications
• The high water absorption of PA6 (~9 % at saturation) remains
• High viscosity requires higher processing temperatures and greater screw torque — injection molding requires powerful equipment and is only suitable to a limited extent (for injection, Promyde® B33L or Examid® PA6 NC are better choices)
• Continuous service above 90 °C is not recommended

Applications

• Monofilament extrusion: fishing lines, trimmer lines for garden equipment, brush filaments for industrial sweepers, braided technical ropes
• Profile and pipe extrusion: conveyor guides, technical profiles, protective tubing for harnesses, corrugated pipes, cable sheathing
• Rotational molding (rotomoulding): large hollow products — fuel tanks for special machinery, medium-size technical reservoirs, protective containers
• Blow molding: technical bottles and canisters for aggressive liquids, expansion tanks for cooling systems
• Sports equipment: tool handles and grips, protective guards, fitness equipment elements
• Insulation components: technical sheathing, extruded medium-duty insulators
• Gears and bearings (machined from rod/sheet): stock shapes for machining large gears, bushings and plain bearings

Global equivalents: BASF Ultramid® B40 / B45, Lanxess Durethan® B 35 F / B 40, DOMO Domamid® 35, Toray Amilan® CM1031M, Radici Radipol® A60. Examid® PA6 R40 is the MW position for serial-scale extrusion and rotomoulding applications.

The stated values are measured by in-house methods close to the corresponding ISO and GOST standards. The information is for reference only and does not constitute an official batch technical data sheet. Please request the TDS and MSDS for a specific batch before industrial use.