Arkema Pebax ES 9002 UV PA11 is specified for vacuum-formed ESD workholding trays that operate under UV-curing lamps in semiconductor assembly and hard-disk handling areas. The raw pellets are dried in a desiccant dryer at 80 °C for 4 h; the drying air dew point is maintained below -30 °C and residual moisture below 0.08 wt% before flat-die extrusion. A single-screw extruder with L/D 24:1 to 30:1 and a barrier screw of compression ratio 2.5:1 to 3.0:1 is run with barrel zones from 170 °C to 215 °C, while die-lip melt temperature is controlled between 190 °C and 215 °C. Sheet thickness between 1.2 mm and 4.0 mm is drawn at a draw ratio below 1.15; excessive draw produces frozen-in stress that later causes corner cracking after vacuum forming. Formed trays are conditioned at 23 °C and 50 % RH for 48 h before electrical verification. Surface resistivity is measured under IEC 62631-3-2 and must remain between 1×10⁶ Ω and 1×10⁹ Ω to fall within the dissipative category of IEC 61340-5-1:2016, Table 2. Static decay from 1 kV to 100 V is recorded below 2.0 s on clean trays. Repeated wiping with 70 % isopropanol does not shift surface resistivity, but alkaline detergents above pH 9 extract low-molecular-weight polyether and raise resistivity into the insulative range. Tensile yield stress of extruded sheet is tested under ISO 527-3:2018; lot reports for this hardness class typically list machine-direction yield stress of 8 MPa to 14 MPa. A process boundary is defined by elastic recovery: when the radius-to-thickness ratio falls below 0.8 on bends exceeding 90°, stress whitening is observed without fracture, but local ESD decay time increases measurably.

What Injection Gate Geometry Prevents Jetting in ESD Wearable Housings?

Injection moulding of Arkema Pebax ES 9002 UV PA11 for wearable electronic housings requires gate geometry that suppresses jetting and prevents weld-line resistivity drift. On a 120-ton hydraulic press with a 2.5:1 intensification ratio, barrel temperatures are set from 200 °C at the feed throat to 235 °C at the nozzle; the nozzle body is held at 225 °C to 235 °C. Mould temperature is controlled between 30 °C and 50 °C. A direct pin gate of 0.7 mm diameter produced jetting in the cavity when ram velocity exceeded 25 mm/s, creating visible flow marks and increasing surface resistivity at the weld line. Replacing the pin with a rectangular edge gate of 1.0 mm thickness and 4.0 mm width suppressed jetting up to 45 mm/s injection velocity. Peak hydraulic pressure during filling is kept below 120 bar. Post-moulding, surface resistivity is conditioned at 23 °C and 50 % RH for 72 h and assessed under IEC 62631-3-2; the target dissipative range is 1×10⁶ Ω to 1×10⁹ Ω per IEC 61340-5-1:2016. Ultrasonic welding with a 20 kHz horn and 40 µm amplitude leads to melt squeezing that can interrupt dissipative continuity at the weld line; a lower amplitude of 28 µm with trigger force 100 N and 0.12 mm joint interference gives lap-shear strength above 4 MPa without shifting weld-line resistivity by more than half a decade. The moulding must not be annealed above 120 °C because polyether segment migration raises surface resistivity. Notched Izod impact strength is measured according to ISO 180:2023; values for this hardness class at 23 °C typically fall from 5 kJ/m² to 10 kJ/m², with a pronounced drop below -30 °C.

Multi-Lumen Microcatheter Shaft Extrusion Through Crosshead Tooling

Medical catheter shafts based on Arkema Pebax ES 9002 UV PA11 are produced on a 20 mm single-screw extruder with L/D 25:1 and a multi-lumen crosshead capable of three to six lumens. The material is predried at 80 °C for 4 h to below 0.06 wt% moisture because polyether-block-amide hydrolysis at elevated moisture reduces lumen concentricity and creates surface voids in walls as thin as 0.15 mm. Melt temperature at the crosshead is set to 210 °C; the barrel ramp is 175 °C, 195 °C, 210 °C. Drawdown ratio is kept between 2.5 and 4.0, while line speed is limited by the requirement to hold outer diameter variation below ±0.02 mm. Distal shaft stiffness is controlled by selecting the hardness class and varying wall thickness, not by changing the grade. Lot certificates report Shore D hardness between 40 and 45 under ISO 868. Tensile strength at break for microcatheter wall specimens is evaluated under ISO 527-2:2012 using type 5 specimens; measured values are generally within 30 MPa to 40 MPa. Biocompatibility assessments follow ISO 10993-5:2009 for cytotoxicity and ISO 10993-10:2010 for skin sensitisation; device-level testing may require USP Class VI depending on patient contact duration. Ethylene oxide sterilisation at 55 °C and 20 % RH does not alter Shore D hardness beyond ±2 points in production lots. Gamma sterilisation above 40 kGy has published data for this specific formulation limited; any gamma terminal sterilisation must be supported by device-level mechanical testing under ISO 10993-1:2018. An operational boundary is that the extruder should not be purged with glass-fibre-reinforced polyamide; residual glass can score the crosshead torpedo and generate lumen defects.

During high-line-speed optical fibre cable processing, Arkema Pebax ES 9002 UV PA11 is applied as a 0.30 mm loose tube buffer over 12-fibre bundles using a 65 mm grooved-barrel extruder with L/D 38:1 and vacuum venting at 0.08 MPa. The resin is dried to below 0.08 wt% moisture and the melt temperature at the extruder head is set to 220 °C. A die temperature of 215 °C is maintained because die temperatures below 205 °C produce sharkskin at line speeds above 150 m/min; the safe die-lip tolerance is approximately ±5 °C. Vacuum sizing and water cooling at 20 °C stabilise the tube outer diameter to within ±0.03 mm. Drawdown ratio is selected between 2.0 and 3.5 to avoid excessive orientation that increases post-extrusion shrinkage. Tube shrinkage is assessed under IEC 60794-1-22:2023; measured values are below 1.5 % after conditioning at 80 °C for 2 h. Low-temperature flexibility is evaluated on completed cable samples using the same standard; no jacket cracking is observed at -40 °C on mandrel bends. ESD surface resistivity of the loose tube body is not the primary determinant for optical tube performance, but control of ionic contamination is required because surface resistivity above 1×10¹² Ω can permit triboelectric discharge during fibre pay-off. The process boundary is set by melt residence time: when the line speed drops below 20 m/min and melt temperature stays above 230 °C, residence time must remain below 8 min to prevent polyether degradation and gel formation. No fluoropolymer processing aids are added; the use of polypropylene regrind above 10 wt% is not permitted in this formulation because low-temperature impact performance becomes non-uniform.

When the Material Is Coextruded with a PA11 Tie Layer in Sports Film

Coextruded film structures for sports equipment shells use Arkema Pebax ES 9002 UV PA11 as the surface layer over a PA11 tie layer. The film is produced on a three-layer blown-film line with 30 mm outer-layer extruders, blow-up ratio 2.2, and die gap 0.8 mm. Melt temperature at the die is controlled from 205 °C to 215 °C. Corona treatment is applied to achieve 42 dyn/cm before lamination with a solvent-based polyurethane adhesive. The tie layer improves adhesion to engineering TPU substrates; peel strength measured under ISO 11339:2022 reaches 3 N/mm with failure occurring in the adhesive rather than film delamination. However, corona treatment above 46 dyn/cm creates surface oxidation that can alter dissipative behaviour; surface resistivity after lamination must be rechecked under IEC 62631-3-2. The UV-stabilised PA11 hard segments are evaluated for colour stability after 1000 h xenon exposure under ISO 4892-2:2013 with a daylight filter; the acceptance threshold for sports equipment is typically ΔE <3 measured with a laboratory spectrophotometer using d/8 geometry. Non-UV-stabilised PA11 regrind must be limited to less than 15 wt% in the outer layer because weathering resistance becomes locally non-uniform. The film must not be stored in contact with release liners containing amine-based slip additives; migration of those additives has been observed to yellow the PA11 surface before lamination and reduce peel strength below the acceptance limit.

Powder Transfer Hose Liner with IEC 61340-5-1 Decay Requirements

Industrial powder transfer hose liners coextruded with Arkema Pebax ES 9002 UV PA11 dissipate static charge in pharmaceutical and food powder conveying. The hose liner is produced on a corrugated pipe extrusion line using a single-screw extruder with vacuum sizing and water cooling at 15 °C. Melt temperature is controlled between 200 °C and 220 °C; the die gap is set at 0.8 mm. Corrugation depth and pitch are adjusted to maintain flexibility without kinking at a bend radius of 2.5 times outer diameter. Electrical resistance across the hose is measured under EN ISO 8031:2020; for dissipative hoses the end-to-end resistance must remain below 1×10⁹ Ω per IEC 61340-5-1:2016. The material retains flexibility at -40 °C, verified by low-temperature bend tests under ISO 4672:2022. Abrasion resistance of the liner is measured under ISO 4649:2021 with a 10 N load; lot values are normally below 120 mm³ loss. A processing limitation is imposed by the outer corrugated cover: if a carbon-black-loaded conductive cover with filler content above 15 wt% is coextruded, the liner surface can show local resistivity hot spots because of carbon particle agglomeration at the interface. The hose liner must not be steam-sterilised at 121 °C for cycles exceeding 30 min; repeated exposure produces hardness loss exceeding 5 Shore D.

Automotive fuel vapour management tubing uses Arkema Pebax ES 9002 UV PA11 as an inner dissipative layer in a multi-layer barrier structure. The trial line is a 45 mm barrier-layer extruder with coextrusion blocks for EVOH and maleated polyamide tie layers. The PA11-PEBA layer is processed at 215 °C to 230 °C with moisture below 0.08 wt%; layer thickness control is held within ±0.02 mm at line speeds near 45 m/min. The outer cover is a UV-stabilised PA12 layer, while the EVOH barrier is 0.10 mm thick and the inner dissipative layer is 0.15 mm thick. Fuel permeation testing is conducted according to SAE J2260:2019; published data for this specific coextruded stack is limited, so end users must validate wall-thickness distribution and tie-layer continuity on production-scale equipment. The inner surface is measured under IEC 62631-3-2 after extrusion; values above 1×10⁹ Ω indicate that the conductive path has been diluted by non-dissipative PA11 carryover, commonly from poor purging at grade change. The line must avoid amine-based heat stabiliser masterbatches in the outer cover because low-molecular-weight amines migrate across the tie layer and interfere with the UV stabiliser in the PA11-PEBA inner layer. Process shutdown requires purging with a low-viscosity polyamide before the barrel cools below 170 °C; otherwise the higher-melting PA11 hard segments solidify in the screw channels and produce start-up torque faults.