Bada BADAMID PA12 FM-Z3 natural S3 PA12, Dry is a natural-colour, dry-state polyamide 12 compound supplied under the BADAMID product designation. The model identifier FM-Z3 is supplier-specific; no compositional inference about the modifier package is made in the absence of a lot-specific datasheet. The suffix natural S3 denotes the colour state in the supplier’s colour code system, not a separate polymer grade. The term Dry indicates that the material is packaged with residual moisture controlled to ≤ 0.10 % as determined by ISO 15512:2019 unless the certificate of analysis states otherwise. Because PA12 is hygroscopic, the dry state refers to the as-packaged condition and not to an indefinite shelf-life after opening.

The base polymer is a long-chain polyamide synthesized from laurolactam or ω-aminolauric acid; its repeating unit contains 12 carbon atoms between amide linkages. This structure produces a density close to 1.01 g/cm³, a melting point near 175–180 °C, and a water-saturation plateau of 1.5–2.0 % at 23 °C per ISO 62:2008. In comparison, PA6 reaches approximately 9.5–10.0 % water saturation under the same conditions, and PA66 reaches approximately 8.5 %. The lower amide-group density of PA12 limits the equilibrium moisture uptake and reduces moisture-induced dimensional change in humid service. Published property values for the FM-Z3 configuration specifically may differ from these PA12 family values; the supplier’s lot certificate remains the controlling source for acceptance limits.

Where Does the FM-Z3 Designation Sit Within the PA12 Product Range?

The FM-Z3 grade belongs to the BADAMID PA12 series, which is intended for injection moulding and extrusion where PA12 is selected for moisture resistance, low-temperature ductility, and chemical resistance. Because the FM-Z3 package is supplier-specific, direct mechanical comparison with unmodified PA12 requires a lot-specific datasheet. However, the dry natural S3 PA12 base typically occupies the lower end of the polyamide modulus range. Representative dry-state PA12 properties from published ISO test data are shown in Table 1; these values are not lot-specific guarantees.

The tensile modulus of dry PA12 is typically 1400–1600 MPa, which is below the 2900–3200 MPa range of dry PA66. This lower stiffness is accompanied by a higher strain at break and lower water affinity, which makes PA12 useful for snap-fits, clips, and housings that must tolerate repeated deflection and humid environments. The notched impact of dry PA12 at 23 °C is typically 4–6 kJ/m². Generic PA12 data show better retention of ductility at sub-zero temperatures than many short-chain polyamides, although the exact value for FM-Z3 should be confirmed by ISO 179-1:2010 on the actual batch.

Non-isothermal differential scanning calorimetry at 10 °C/min cooling typically places the PA12 crystallisation peak near 150–160 °C. Rapid cooling in thin walls suppresses crystallinity and reduces modulus; slower cooling in thick sections increases crystallinity, stabilises dimensions, and raises density slightly. The melt volume-flow rate of unfilled PA12 is commonly 10–30 cm³/10 min at 235 °C and 2.16 kg according to ISO 1133-1:2022. The FM-Z3 value must be read from the lot datasheet because supplier-specific stabilisation and lubricant packages can shift melt viscosity without altering the base polymer density.

Drying and Melt Preparation Limits for Natural S3 Feedstock

Before melt processing, the resin must be dried to ≤ 0.10 % residual moisture. A desiccant dryer with a dew point of ≤ -30 °C and inlet air temperature of 80 °C is standard. Drying time of 4–12 h is typical for material initially below 0.20 % moisture; material exposed to ambient air above 60 % relative humidity for more than 1 h should be re-dried. Hot-air-only drying without desiccant is not recommended because dew-point control is required to achieve the target moisture in open-loop systems. The dry-state packaging does not remove the need for machine-side drying after bag opening.

For injection moulding, barrel temperature profiles from feed to nozzle are typically 220 °C, 230 °C, 240 °C, and 240–250 °C. The melt temperature should not exceed 260 °C; residence time above 10 min at the upper setpoint can produce yellowing and a measurable loss of Charpy notched impact due to thermal oxidative degradation. Mould temperatures between 40 °C and 60 °C produce satisfactory crystallinity for unfilled PA12. A mould temperature of 80 °C improves surface replication and post-mould dimensional stability but extends cooling time. For hot-runner moulds, thermal uniformity in the manifold should be maintained within ± 5 °C to avoid local solidification or degradation; published data for this specific FM-Z3 configuration in heated-tip systems is limited.

For profile or tubing extrusion, a general-purpose screw with L/D 18–22 and compression ratio 2.0:1–2.5:1 is adequate. Melt temperature 220–250 °C, die temperature 230–250 °C, and vacuum calibration are typical. No high-shear dispersion is required because the natural PA12 base does not contain glass fibre or mineral filler. The use of barrier screws or intensive mixing sections may increase shear heating and should be avoided unless validated for this grade. Pre-blending of colour masterbatch or additives is performed with a low-shear tumble mixer.

When Fuel or Aqueous Chloride Service Is Specified, Chemical Resistance Boundaries Apply

PA12 is used in automotive fuel lines, compressed-air tubing, cable jackets, and fluid connectors because of resistance to aliphatic and aromatic hydrocarbons, diesel fuel, lubricating oils, refrigerants, and alkaline salt solutions. Immersion testing under ISO 175:2010 shows limited property change in these media at room temperature. The grade is not resistant to concentrated mineral acids, formic acid, phenols, cresols, or strong oxidizing agents. Exposure to zinc chloride solutions above 50 °C may induce environmental stress cracking in PA12; parts under internal pressure or moulded-in stress are more sensitive. Published data for the FM-Z3 package under specific fuel blends containing ethanol or methanol above 15 % is limited; validation with the actual medium and temperature is required. Prolonged contact with strong bases at elevated temperature can hydrolyze the amide linkage, reducing molecular weight and tensile strength.

In direct comparison with PA6 and PA66, PA12 FM-Z3 natural S3 dry grade offers a lower density and lower equilibrium moisture content but also a lower tensile modulus and strength. This trade-off is relevant for parts that must maintain geometry in humid or wet environments. A PA6 component may absorb 2.5–3.0 % moisture at 50 % relative humidity, while PA12 absorbs approximately 0.7–0.8 %. The resulting dimensional change is smaller for PA12, which is useful in precision clips and housings. However, when higher stiffness is required, PA66 or glass-filled PA12 is usually selected. The FM-Z3 grade is therefore not a direct substitute for high-modulus PA66 in load-bearing structural ribs.

Compared with PA11, PA12 has a slightly lower melting temperature and broadly similar water absorption. PA11 is often bio-based, whereas commercial PA12 grades are predominantly petrochemical. The choice between PA12 and PA11 in flexible tubing or cable protection is usually driven by supplier-specific approvals, processing consistency, and cost rather than by large differences in moisture resistance. Compared with polyoxymethylene, PA12 has lower modulus and lower creep resistance at room temperature but is less prone to sharp property loss in acidic hydrolysis conditions; material selection should follow the actual chemical environment and load history.

Application records for PA12 dry natural grades include pneumatic tubing, cable sheathing, automotive fuel and vent lines, industrial hoses, snap-fit clips, gear wheels, and conveyor wear strips. Natural S3 colour is suitable where pigmentation is not required or where colour masterbatch is added at processing. The dry form is preferred for direct extrusion because residual moisture is already low, but it does not eliminate the need for pre-drying after bag opening. In medical or food-contact applications, the natural colour should not be interpreted as a regulatory approval; compliance with EU Regulation 10/2011, FDA 21 CFR 177.1500, or ISO 10993-1:2018 must be established for the specific grade and final article.

The unpigmented natural state of this grade means that UV stabilisation is not inherent. Outdoor exposure can lead to surface oxidation and embrittlement unless carbon black or a UV stabiliser is added. Lot-to-lot variation in melt viscosity and colour should be monitored by incoming quality control using ISO 1133-1:2022 melt flow testing and spectrophotometric colour measurement. Mould shrinkage values for unfilled PA12 typically lie between 0.7 % and 1.2 % parallel to flow and 0.8 % to 1.3 % transverse according to ISO 294-4:2018; actual values depend on mould temperature and wall thickness. Compliance statements for RoHS Directive 2011/65/EU and REACH Regulation EC 1907/2006 must be confirmed against the supplier’s lot-specific declarations. Unpigmented natural PA12 is not a declaration of food-contact, medical, or drinking-water suitability.