Impact-resistant extrusion polyamide Promyde B33 P2 HI

Description

Promyde® B33 P2 HI is an extrusion grade of polyamide 6 (PA6) with impact modification and heat stabilization. Grade designation: B — medium-viscosity extrusion/injection grade, 33 — relative viscosity η_rel ≈ 3.3, P2 — second generation of the processing profile (improved processing stability), HI — High Impact (impact modification).

It is developed for parts and products operating under dynamic, impact and cyclic loads with possible temperature rises or contact with aggressive media. Its key niche is extruded products: monofilaments for technical ropes and nets, mechanical-purpose profiles, and medium-pressure hoses with requirements for burst resistance and repeated flexing.

Typical parameters (PA6 HI grade): density ~1.12 g/cm³, notched Charpy impact strength ~12–15 kJ/m² at 23 °C and ~6–8 kJ/m² at −30 °C (ISO 179-1eA — modified PA6 retains low-temperature impact strength twice as well as unmodified PA6), relative viscosity ~3.3, Tm 220 °C, continuous service temperature up to 90 °C (dry). The stiffness reduction after impact modification is ~20–30 % vs standard PA6 (a typical trade-off).

Key advantages

• High impact strength over a wide temperature range — remains serviceable under impact and cyclic loads from −30 °C to +90 °C
• Heat stabilization: resistance to degradation during prolonged extrusion (1000+ hours in the melt zone without significant molecular weight loss), stable monofilament and profile quality in serial production
• Resistance to oils, gasoline, diesel, dilute alkalis and aliphatic hydrocarbons
• Resistance to repeated flexing and abrasive wear — suitable for ropes and cords with a long service cycle
• Can be colored with masterbatches during extrusion
• Processing versatility: extrusion of monofilaments, hoses and profiles; limited injection molding (due to increased melt viscosity)

Limitations

• Stiffness (tensile modulus) 20–30 % lower vs standard PA6 — for rigid structural parts consider Promyde® B33L or GF-reinforced grades
• High water absorption of PA6 (~9 % at saturation) — dimensions and mechanical properties change in humid environments; for marine and outdoor applications with long exposure consider PA610 or PA12
• UL 94 HB / V-2 depending on the batch — not for applications requiring V-0

Applications

• Fishing nets and ropes: monofilaments for trawl and fixed nets, trawl ropes, lashings — long service in salt water and under impact loads against the hull and gear
• Technical cords and ropes: rigging ropes, cords for exercise machines and sports equipment, sailing rigging, cargo lashings
• Industrial monofilaments: brush filaments for road sweepers, card belts, technical filtration meshes
• Extruded hoses and tubing: medium-pressure pneumatic lines (5–10 bar), low-pressure hydraulic hoses, protective tubing for wiring harnesses and optical fiber
• Technical profiles: bumper trims, protective edges of industrial equipment, impact-resistant conveyor system profiles
• Sports and protective gear: elements of hockey uniforms and boxing protection, shoe lacing, protective nets for sports grounds

Global equivalents: BASF Ultramid® B3K, Lanxess Durethan® B 30 S HI, DOMO Domamid® 27HI, Toray Amilan® TY-500NHI. Promyde® B33 P2 HI is the MW position for serial extruded products prioritizing impact strength and UV resistance. For applications where UV resistance is critical (long outdoor exposure), request the UV-stabilized modification separately.

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