| HS Code | 413222 |
| Density As Conditioned 23 C | 1.01 g/cm³ |
| Tensile Modulus 1 Mm Min As Conditioned | 500 MPa |
| Yield Stress 50 Mm Min As Conditioned | 20 MPa |
| Yield Strain 50 Mm Min As Conditioned | 10% |
| Nominal Strain At Break 50 Mm Min As Conditioned | >50% |
| Charpy Impact Strength 23 C As Conditioned | No break |
| Charpy Impact Strength 30 C As Conditioned | No break |
| Charpy Notched Impact Strength 23 C As Conditioned | No break |
| Charpy Notched Impact Strength 30 C As Conditioned | 12 kJ/m² |
| Melting Temperature Dsc 10 C Min | 178°C |
| Vicat Softening Temperature B 50 As Conditioned | 65°C |
| Heat Deflection Temperature A 1 8 Mpa As Conditioned | 30°C |
As an accredited Evonik Vestamid L2121 sw 9.7507 (as-conditioned) Nylon 12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaging: 25 kg moisture-barrier polyethylene bags, palletized and shrink-wrapped, containing Evonik Vestamid L2121 sw 9.7507 as-conditioned Nylon 12. |
| Container Loading (20′ FCL) | 20′ FCL: palletized bags of Nylon 12, securely stowed and braced to prevent shifting during transit. |
| Shipping | Vestamid L2121 Nylon 12 ships as a non-hazardous, non-regulated material. Keep pellets sealed in original moisture-proof bags, protected from heat and humidity. Use dry, clean containers or drums; avoid dust accumulation. No special transport classification required, though standard safe handling and spill prevention apply. |
| Storage | Store Evonik Vestamid L2121 sw 9.7507 (as-conditioned) Nylon 12 in its original, tightly sealed container in a cool, dry, well-ventilated area. Protect from direct sunlight, excessive heat, moisture, and humidity to prevent property changes. Avoid exposure to oxidizers and incompatible materials. Keep away from ignition sources. Follow manufacturer’s recommendations and use within specified shelf life. |
| Shelf Life | Store dry, cool, and in original sealed packaging. Shelf life is typically two years from production date. |
Evonik Vestamid L2121 sw 9.7507 is supplied as a black polyamide 12 extrusion compound in as-conditioned pellet form. The melt temperature during processing is typically held between 220 °C and 245 °C for tubular cross-sections and between 215 °C and 235 °C for thin-wall cable jackets; lower settings inside these bands reduce shear heating, higher settings improve surface finish but narrow the melt-strength window. Because PA12 is hygroscopic, if the pellets are exposed to ambient air above 60 % RH before hopper loading, pre-drying at 80 °C to a residual moisture content of ≤0.10 % by ISO 15512:2019 is mandatory. Unlike plasticized PA12 grades, this material does not require an external plasticizer addition, and the black pigmentation present in sw 9.7507 removes the requirement for a separate carbon black masterbatch in most black end-products. The compound should not be blended with amine-based nucleators or strongly alkaline additive packages unless full production-scale validation shows no oxidative degradation; such additions can shift melt crystallization behaviour and produce die-lip deposit.
Before the melt enters the calibration sleeve, the hopper residence time for coiled air brake tubing is set by the measured residual moisture: if in-plant storage exceeds 24 h at 40 % RH, the pellets are dried at 80 °C for 4 h to 8 h. The formulation is run as 100 % neat as-conditioned pellets; closed-loop regrind from start-up scrap and dimensional changeovers can be added up to 10 wt% only when sieve analysis rejects particles above 2.0 mm and the regrind moisture is verified at ≤0.10 %. No plasticizer or carbon black masterbatch is required. The production line typically uses a single-screw extruder with L/D 24:1 to 30:1 and a compression ratio of 2.5:1 to 3.0:1. Barrel profile from feed to die is commonly set at 210/220/230/235/230 °C, with the melt temperature measured at the die entry between 228 °C and 238 °C. Vacuum calibration at -0.02 MPa to -0.06 MPa holds the outside diameter; water bath temperature is kept between 15 °C and 25 °C. Line speed for tube outside diameters from 6 mm to 12 mm is normally 15 m/min to 60 m/min. Common defect modes on production lines include melt fracture at the die when melt temperature falls below 225 °C, surface bubble formation when residual moisture exceeds 0.10 %, and ovality caused by misaligned puller rollers. Burst pressure, low-temperature impact at -40 °C, tensile elongation, and oil resistance are assessed against SAE J844, ISO 7628-1, and DIN 74324-1. Finished articles include coiled air brake lines, trailer air suspension tubes, and gearbox breather tubes.
The outer jacket in coextruded fuel vapour return lines is specified where low-temperature flexibility, stone-impact resistance, and resistance to road salt must be maintained without increasing permeation. In a typical low-permeation construction, the PA12 outer layer is set at 0.15 mm to 0.30 mm for a total wall thickness of 1.0 mm, corresponding to 15 % to 30 % of the wall. The PA12 layer is run at 100 % neat as-conditioned pellets; a maximum of 15 wt% clean in-house regrind may be returned to the outer layer only after residual moisture is confirmed at ≤0.10 % and the fraction is screened below 1.5 mm. The coextrusion line uses a separate PA12 extruder with L/D 25:1 and melt temperature 220 °C to 230 °C; the barrier layer, typically EVOH, is protected by tie layers, while the inner layer may be a less permeable polyamide or PBT grade. Thickness distribution is controlled by an ultrasonic gauge immediately before vacuum calibration. The PA12 outer layer is not the primary hydrocarbon barrier; its function is mechanical protection and impact resistance, so reducing its thickness below 0.15 mm does not improve permeation but does increase the risk of split outer wall during fitting assembly. Applicable system standards include SAE J2260 for low-permeation fuel tubing, with OEM-specific requalification for high-aromatic and methanol-containing test blends; published permeation data for this specific black compound in aggressive alcohol blends is limited. Terminal components include fuel filler neck vent lines, evaporative emission vapour return lines, and auxiliary vent tubes in commercial vehicle fuel systems.
The production of semirigid PA12 tube for push-in fittings is driven by outside diameter tolerance and retained burst pressure after long-term dry heat exposure. The compound is run at 100 % neat; if a hardness reduction is required, it is preferable to select a lower-hardness PA12 grade rather than adding plasticizer, because external plasticizer migration in compressed-air systems can contaminate seals and change fitting retention. Wall thickness for food-processing pneumatic circuits is usually set to provide a 4:1 to 6:1 burst-to-working-pressure ratio, while high-vibration robot tooling lines may require 8:1. The extruder barrel is set from 210 °C to 235 °C, with die temperature 230 °C; vacuum-sizing pressure is adjusted to hold OD tolerance within ±0.05 mm for 4 mm to 6 mm outside diameters. A dual-axis laser gauge records OD and ovality at 50 Hz, and an in-line pressure test at 1.5 times rated working pressure detects pinholes. Inner surface melt fracture becomes a fitting-leakage defect if line speed is increased without raising melt temperature, because the inner die land cannot recover from frozen-in sharkskin after calibration. Compliance is typically verified against ISO 4414:2010 for system design and the connector-level requirements of ISO 14743:2004 for push-in fitting retention under cyclic pressure. End products include pneumatic tubing for factory automation, vacuum sensing lines, and robotic end-of-arm tooling tube sets.
Because crosshead extrusion over twisted copper conductors sets the insulation or sheath diameter by drawdown rather than fixed wall thickness, the first 10 m to 15 m after start-up are scrapped until in-line eccentricity measurement stabilises below 0.03 mm. The PA12 sheath is run at 100 % as-conditioned pellets; regrind is limited to 5 wt% of same-run sheath scrap, because higher levels shift elongation-at-break after hot-air ageing and complicate lot traceability. Conductor preheat at 60 °C to 80 °C improves adhesion without degrading the twisted pair insulation. Melt temperature at the crosshead is held between 220 °C and 232 °C; drawdown ratio is set from 1.2:1 to 1.5:1 to preserve low-temperature flex behaviour. Water cooling at 15 °C to 25 °C is followed by air wiping and a diameter gauge. For road vehicle cables, the construction is checked under ISO 6722-1:2011 for 60 V DC single-core cable, including cold bending at -40 °C, abrasion resistance, and heat-ageing elongation. The finished articles are low-voltage sensor cable sheaths in ABS wheel-speed circuits, gearbox speed-sensor leads, and knock-sensor harnesses. The carbon black in sw 9.7507 contributes to UV resistance but does not by itself qualify the cable for direct burial or power transmission applications above the voltage class of the applicable ISO 6722 part.
For subsea hydraulic control lines and chemical injection services, PA12 is used as a single-layer pressure containment tube where bending fatigue, seawater corrosion, and installation radius are the controlling design factors. The production specification for this compound is 100 % virgin as-conditioned pellets; no post-industrial regrind is permitted unless the material is incorporated into a separately qualified lot with full mechanical and ageing reconfirmation. Wall thickness for a 6.35 mm outside diameter control line is commonly from 1.0 mm to 1.5 mm, with in-line ultrasonic wall-thickness control at ±0.05 mm. Melt temperature is held between 220 °C and 235 °C, vacuum calibration uses water at 10 °C to 20 °C, and the finished tube is annealed in a hot-water bath at 90 °C to 100 °C for 2 h to 4 h to reduce frozen-in orientation. Subsea operating conditions introduce hydrostatic collapse and gas migration into the annulus as design hazards; wall thickness must therefore account for external pressure at depth and for slow decompression after gas permeation. Applicable qualification documents include API 17E, ISO 13628-5, and NORSOK M-710 for polymer resistance to sour gas and chemical ageing. Water absorption of PA12 under ISO 62 can reach approximately 1.5 % at saturation in 23 °C water, which must be included in bore-diameter and burst calculations. The operational envelope for wet sour service is not unlimited; long-term continuous fluid temperature above 60 °C to 70 °C requires project-specific testing, and published data for this black as-conditioned compound in high-H2S multicomponent effluents is limited. Finished products include hydraulic control lines, subsea chemical injection tubes, and thermoplastic tube elements inside steel-tube umbilicals.
| Qualification area | Standard / method | Test condition or acceptance target |
|---|---|---|
| Polymer sour service resistance | NORSOK M-710 | Simulated produced-fluid ageing with H2S/CO2 at design temperature |
| Subsea umbilical control lines | API 17E / ISO 13628-5 | Burst, collapse, gas permeation, fatigue qualification |
| Water absorption | ISO 62 | Saturation at 23 °C water; approximately 1.5 % for PA12 |
| Residual moisture before extrusion | ISO 15512:2019 | ≤0.10 % |
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VESTAMID L2121 sw 9.7507 is a black-coloured polyamide 12 (PA12) material supplied by Evonik. The abbreviation sw denotes “schwarz,” the German term for black used in polyamide colour nomenclature, and 9.7507 is the internal black colour batch code. The designation “as-conditioned” refers to test specimens that have been brought to moisture equilibrium in a standard atmosphere at 23 °C and 50% relative humidity, as defined in ISO 291:2008 and, for accelerated polyamide conditioning, ISO 1110:2019. This moisture state is not a melt-processing condition; it is the defined basis for reporting mechanical, thermal, and electrical values that more closely approximate service behaviour in humid air.
The polyamide 12 backbone has a lower amide group density than PA6 or PA66, which limits equilibrium moisture uptake and reduces the extent of property change in humid environments. The as-conditioned data set is therefore the most useful reference for designers comparing flexible tubing, cable jackets, or clips with other conditioned thermoplastics. The grade is supplied as black compound, and the colour batch influences near-surface appearance, laser marking response, and weld-line visibility. Published data for this specific configuration are typically lot-dependent, and procurement specifications should reference the current supplier datasheet rather than generic PA12 values.
Polyamide 12 absorbs water more slowly than PA6 or PA66, but moisture still migrates into the amorphous regions of the matrix during conditioning. The absorbed water acts as a polar plasticiser, increasing chain mobility and lowering tensile modulus, while raising elongation at break and notched impact energy. When specimens are tested after conditioning to 23 °C and 50% relative humidity, the tensile modulus is lower than the dry-as-moulded value. For VESTAMID L2121 sw 9.7507, public datasheet values in the as-conditioned state are commonly cited in the range of 250–350 MPa under ISO 527-1:2019 and ISO 527-2:2012. Dry values are typically 10–30% higher. The tensile stress at yield is reported near 16–20 MPa, while nominal strain at break often exceeds 200%. These ranges should be treated as typical lot averages rather than absolute specification minima.
Charpy impact data for the as-conditioned grade are frequently listed as no break at 23 °C and at −30 °C when tested according to ISO 179-1:2010. This response is characteristic of flexible PA12 formulations and indicates that the material can absorb impact energy without splitting under rapid loading. The density is near 1.01 g/cm³ under ISO 1183-1:2019, and water absorption at saturation is approximately 1.2–1.5 wt% under ISO 62:2008. The melting point determined by differential scanning calorimetry under ISO 11357-3:2018 is near 176–178 °C, while the heat deflection temperature at 0.45 MPa is typically below 110 °C under ISO 75-2:2013. Low-temperature flexibility and high elongation are the main differences from unplasticised PA12 compounds, which typically exhibit a dry tensile modulus above 1,000 MPa.
| Property | Test Method | Typical As-Conditioned Value |
|---|---|---|
| Density | ISO 1183-1:2019 | 1.01 g/cm³ |
| Water absorption at saturation | ISO 62:2008 | 1.2–1.5 wt% |
| Tensile modulus | ISO 527-1:2019, ISO 527-2:2012 | 250–350 MPa |
| Tensile stress at yield | ISO 527-1:2019 | 16–20 MPa |
| Nominal strain at break | ISO 527-1:2019 | >200 % |
| Charpy notched impact, 23 °C | ISO 179-1:2010 | no break |
| Charpy notched impact, −30 °C | ISO 179-1:2010 | no break |
| Melting point | ISO 11357-3:2018 | 176–178 °C |
| HDT at 0.45 MPa | ISO 75-2:2013 | <110 °C |
| Shore D hardness | ISO 868:2003 | 55–60 |
The material is not a drop-in substitute for unplasticised PA12 grades such as VESTAMID L1723 or L1940. The lower as-conditioned modulus changes flexural stiffness, hoop stress retention in pressurised tubing, and the clamping force required for injection-moulded clips. Compared with unplasticised PA12, L2121 exhibits lower Shore D hardness, lower tensile modulus, and higher elongation at break. This shift is produced by internal modification of the polyamide 12 matrix; the grade is classified as a flexible or semi-flexible extrusion compound. The retained PA12 chemistry maintains low water absorption relative to PA6 or PA66 and provides resistance to aliphatic fuels, oils, and greases. Compared with PA6 and PA66, the PA12 backbone has a lower density of approximately 1.01 g/cm³ versus 1.13–1.14 g/cm³, and lower equilibrium moisture content, which reduces dimensional movement in humid conditions. Compared with polyamide 11, moisture uptake is similar, but PA12 typically offers a lower density and a slightly lower melting point, although end-use validation is required because grade-specific additives and colour batches influence final performance.
The shift from a rigid PA12 to L2121 also alters extruder pressure generation. A single-screw extruder with L/D 24:1–30:1 and a compression ratio of 2.5:1–3.0:1 can process the material, but the lower melt viscosity of the flexible grade may reduce head pressure relative to unplasticised PA12 at the same screw speed. If a line is configured for rigid PA12 tubing, screw speed and barrel profile should be re-established using a capillary rheometer according to ISO 11443:2021. Published data for this specific configuration is limited; processors should map apparent shear viscosity across 100–1,000 s⁻¹ before committing to tooling.
Pre-drying is required before melt processing. The resin should be dried in dehumidified air at 80 °C for 4–6 h to a residual moisture level below 0.1 wt%, measured by Karl Fischer titration under ISO 15512:2019. At relative humidity above 60%, open hopper residence time should be limited because flexible PA12 can re-absorb surface moisture quickly. In extruded pneumatic tubing and cable sheathing, a rising barrel profile from feed 180 °C to die 210–220 °C is commonly used, with the die held at 210 °C. Overheating above 250 °C risks thermal degradation, while insufficient heating causes melt fracture and surface roughness in thin-wall sections.
Typical production-scale uses include pneumatic and hydraulic tubing, cable sheathing, flexible conduit, automotive fluid lines, and industrial clips where low-temperature impact resistance is required. The as-conditioned impact response makes the grade suitable for coiled tubing that must survive impact at sub-zero temperatures during installation. Because the material is black, laser marking can be used for part identification, but the marking contrast must be validated with the specific colour batch 9.7507 because pigment loading affects laser absorption.
Compliance statements must be confirmed against the supplier’s current certificate for this colour batch. The polyamide 12 base resin is generally within the scope of the European Restriction of Hazardous Substances Directive 2011/65/EU as amended by (EU) 2015/863, but the black colourant system must be included in the supplier’s declaration. Under REACH Regulation EC 1907/2006, the material supplier is obliged to communicate substances of very high concern above 0.1 wt% under Article 33. For food-contact applications, the specific grade and black colour batch must be confirmed against FDA 21 CFR 177.1500 or EU 10/2011; the as-conditioned mechanical data alone do not establish food-contact suitability.
| Requirement | Standard or Regulation | Documentation Basis |
|---|---|---|
| Hazardous substances | 2011/65/EU, (EU) 2015/863 | Supplier conformity declaration |
| SVHC communication | EC 1907/2006, Article 33 | REACH safety data sheet |
| Food contact | FDA 21 CFR 177.1500, EU 10/2011 | Grade-specific compliance letter |
| Standard atmosphere conditioning | ISO 291:2008 | Laboratory test record |
| Accelerated polyamide conditioning | ISO 1110:2019 | Laboratory test record |
| Capillary rheometry | ISO 11443:2021 | Process development report |
Operational boundaries include the need to avoid prolonged exposure to strong mineral acids, concentrated oxidising agents, and certain aqueous zinc chloride solutions, which can attack polyamide 12. The grade should not be combined with unmodified high-melting PA6 or PA66 in melt blends because viscosity mismatch and incompatibility can produce delamination and loss of elongation in extruded profiles. For applications requiring flexural modulus above 1,000 MPa, glass-fibre-reinforced PA12 or unplasticised PA12 should be selected instead. These boundaries should be incorporated into incoming resin specifications and process start-up checklists.
