High-viscosity extrusion polyamide Promyde B33L

Description

Promyde® B33L is a medium-viscosity injection molding grade of polyamide 6 (PA6) with an internal lubricant. Grade designation: B — medium-viscosity injection/extrusion grade, 33 — relative viscosity η_rel ≈ 3.3 (96 % H₂SO₄), L — lubricated (internal lubricant to ease part demolding and reduce friction during melt flow).

It is positioned as a universal workhorse PA6 for a broad range of series-produced molded and extruded technical parts: machine building, non-structural automotive components, electrical housings, household appliances. The lubricant shortens the molding cycle time and reduces tooling wear, and also eases the demolding of parts with complex geometry without distortion. Base flammability class UL 94 V-2 (self-extinguishing, but with possible flaming drips) — do not use in FR-critical applications (for V-0, see the dedicated FR grade).

Typical parameters (standard medium-viscosity PA6): density 1.13 g/cm³, η_rel ≈ 3.3, MFR ~12–18 g/10 min (275 °C / 5 kg), HDT/A ~60–75 °C (ISO 75-2, 1.8 MPa; conditioned at 4–5 % H₂O), Tm 220 °C, continuous service temperature ~80 °C (dry), decreasing to ~60 °C at moisture saturation. Water absorption at saturation ~9 % (typical for PA6).

Key advantages

• Processing versatility: injection molding + extrusion from a single compound (simplifies purchasing and warehouse logistics)
• Reduced coefficient of friction thanks to the internal lubricant — easier demolding, longer tooling life
• High impact strength both dry and moisture-conditioned (a typical PA6 characteristic compared with PA66)
• Resistance to oils, gasoline, diesel fuel, dilute alkalis and aliphatic hydrocarbons
• Good electrical insulation properties (dry)
• Can be colored with masterbatches during processing
• Base flammability UL 94 V-2 — self-extinguishing after removal of the flame source
• ISO 9001 compliance at the pellet production stage

Limitations and warnings

• UL 94 V-2, not V-0 — flaming drips of burning material are possible; do not use for parts with FR-critical requirements (electrical equipment requiring V-0/5VA, transport per EN 45545, etc.)
• High water absorption (~9 % at saturation) — parts change dimensions and lose up to 30–40 % of stiffness in service in humid environments; for moisture-resistant applications, consider PA610, PA12 or PPA
• Food contact — the presence of the lubricant requires separate certification of the finished product per FDA / EU 10/2011 (migration testing)
• Gas barrier properties of PA6 are higher than those of PE/PP (on the order of 1 cm³·mm/(m²·day·bar) for O₂) but lower than EVOH and PVDC; multilayer structures or EVOH are needed for high-barrier packaging

Applications

• Molded technical parts: tool housings, medium-load gears, bushings, guides, brackets, fittings for low-pressure pneumatic systems
• Monofilament extrusion: fishing lines, trimmer lines, brush filaments, braided ropes, film monofilaments for textiles
• Extruded profiles: conveyor guides, edge protection, technical profiles for machine building
• Cable industry: technical bushings and sheaths, cable duct components, household extension cords
• Non-structural automotive components: decorative trim, harness holders, interior elements without FR requirements
• Household appliances: attachment housings, handles, internal technical components without food contact
• Construction: fastening elements, bushings in steel structures, non-structural trim

Global market counterparts: BASF Ultramid® B27 / B36, Lanxess Durethan® B30 S, Radici Radipol® A45, DOMO Domamid® 24, Toray Amilan® CM1017. Promyde® B33L is the MW position for general-purpose series injection molding and extrusion applications. For UL 94 V-0 applications, see Promyde® B40 P2 U0T or Promyde® B30 P BL01 (flame-retardant grades in our range).

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