Bada BADAMID PA12 GM30 H natural S2 is a heat-stabilized, 30% glass-fiber-reinforced polyamide 12 injection-molding compound supplied as natural-colored pellets with controlled dry moisture content. The designation sequence identifies the base polymer, the glass-reinforced product family with nominal 30% glass loading, heat stabilization, natural color, and the supplier-specific S2 flow or additive level. The term “dry” refers to the granulate condition at packaging and does not imply that molded parts are hydrolysis-resistant or moisture-free under long-term humid service.

The material is intended for injection molding of structural components that require lower moisture uptake than PA6 or PA66 grades, lower density, and higher stiffness than unfilled PA12. Mechanical, thermal, and processing data are based on dry-as-molded specimens. Finished part performance depends on fiber orientation, weld-line position, wall thickness, and conditioning history.

Mechanical and Thermal Baseline Values Under Dry-as-Molded Conditions

Table 1 compiles the primary physical, mechanical, and thermal baselines from published industrial data for PA12 GF30 dry-conditioned specimens. Use these values for material selection only; critical tooling and dimensioning require lot-specific data measured at the actual wall thickness and fiber orientation state.

Before melt processing, the granulate is predried in a desiccant dryer at 80°C for 4–6 h, or to a residual moisture content below 0.10% by weight. Residual moisture above 0.15% causes splay, nozzle drool, reduced melt viscosity, and weak weld-line strength. The feed throat is maintained below 80°C to prevent bridging of the glass-filled pellets. The melt temperature measured at the nozzle is normally set between 240°C and 280°C; the lower third of this range is used for thick sections and large gates, while the upper third is used for thin-wall fill and long flow paths. Temperatures above 300°C are avoided because oxidative degradation of the heat-stabilized PA12 matrix can become measurable as a drop in intrinsic viscosity and a color shift in natural parts. At 280°C, total melt residence time above 10 min is discouraged.

Standard molding equipment uses a three-zone screw with an L/D ratio of 18:1 to 22:1, a compression ratio of 2.0:1 to 2.5:1, and wear-resistant barrel, screw, check ring, nozzle tip, and shut-off nozzle surfaces. Glass fiber is abrasive, so high-hardness bimetal liners and ceramic check ring seats are specified for long campaigns. Back pressure is maintained between 2 bar and 8 bar, and screw peripheral speed is limited to below 0.4 m/s to reduce fiber attrition. Injection speed is set by wall thickness: moderate for sections above 3 mm, fast for sections below 1.5 mm. Gate velocities above 200 mm/s in small gates can locally reduce fiber length to below 150 µm and lower notched impact. Mold temperature is controlled between 40°C and 80°C; the higher level increases crystallinity, improves knit-line strength, and reduces post-mold shrinkage but extends cycle time. Hold pressure is applied until gate freeze with cushion control between 3 mm and 5 mm.

Hot runner systems require open-bore, low-shear channel geometry and individual nozzle temperature control. A manifold temperature spread above 5°C can produce viscosity differences that shift the flow front and create anisotropic fiber orientation. Vent depths for glass-filled PA12 are typically 0.02–0.04 mm; volatile deposits from the heat-stabilized polymer can clog vents and require defined preventive-maintenance cleaning. For mold-filling simulation, capillary rheometry is recommended at 260°C, 270°C, and 280°C across shear rates from 10 s⁻¹ to 10⁴ s⁻¹. Published data for the exact S2 flow variant is limited; simulation inputs should be generated from the actual production lot, not from a generic PA12 GF30 database.

What Separates a PA12-Based 30% Glass-Fiber Grade from PA6/PA66 GF30 in Humid or Aggressive Fluid Service?

At the same nominal 30% glass loading by weight, the PA12 matrix absorbs less moisture than PA6 or PA66. Equilibrium moisture uptake at 23°C and 50% RH is approximately 0.7–0.8% for PA12 according to ISO 62, compared with roughly 2.2–2.8% for PA66. This lower moisture uptake limits the reduction in tensile modulus after humid conditioning. The dry tensile modulus of this grade is typically 7,500–9,000 MPa; after moisture equilibrium at 50% RH the loss is commonly below 15%. A representative PA66 GF30 may begin at 9,000–10,500 MPa dry but loses 30–40% of its dry value in the same environment. Dimensional change from swelling is therefore smaller, which is significant for snap-fit arms, clip seats, and cylindrical housings requiring clamping force retention.

Component mass is lower because the PA12 GF30 density of about 1.23 g/cm³ is below the 1.35–1.38 g/cm³ typical of PA66 GF30. This supports mass reduction in brackets, connectors, and rotating parts at equal envelope dimensions. The trade-off is thermal deflection temperature: under 1.8 MPa load, PA12 GF30 values are in the range 155–170°C by ISO 75-1/-2, while PA66 GF30 grades often exceed 240°C. Substitution into load-bearing structures above 150°C requires part-specific testing.

Representative values for PA66 GF30 and PA12 unfilled are drawn from industrial datasheets for standard grades. The S2 variant should be compared using its own certificate of analysis. In aggressive fluid service, the glass-fiber-matrix interface can be attacked if the fluid penetrates along the fiber bundle. Parts with exposed glass at the surface should be tested under ISO 175 immersion at the service temperature; a reduction in notched Charpy impact greater than 25% after 7 days is a screening limit. Lower moisture uptake of PA12 reduces the plasticizing effect that accelerates creep under clamp load.

Application cases in automotive fluid handling and industrial drive components expose the part to clamp load, vibration, and intermittent chemical contact. Fluid connectors, cable retainers, pneumatic brake line clips, and structural housings are molded in wall thicknesses from 1.5 mm to 4.0 mm. Gate placement is located away from sealing surfaces and snap-fit arms because weld lines in those regions can reduce burst strength and flexural fatigue resistance. Glass fiber length after molding is generally 200–400 µm, measured after ash at 600°C for 30 min according to ISO 3451-1. High-shear gates can reduce fiber length below 150 µm and lower notched impact by 20–30% relative to low-back-pressure processing.

The grade is used where PA12 resistance to zinc chloride and common automotive road salts prevents stress-corrosion cracking that can occur in PA66 grades under winter salt exposure. Industrial gears, bearing cages, and pump impellers require larger gates and runner systems to avoid surface glass emergence and fiber-poor regions at flow fronts. Because PA12 GF30 melts at 175–180°C, it can be processed at lower barrel temperatures than PA66 GF30, reducing energy input in electric injection machines. Continuous contact with hot water, steam above 121°C, or coolant outside the pH range 5–9 should be evaluated by immersion testing under ISO 175 before selection.

When Heat Aging and Chemical Exposure Coincide, Heat Stabilization and Fiber-Matrix Adhesion Control Failure Onset

Heat stabilization delays oxidative embrittlement in hot-air environments, but the service limit depends on temperature, airflow, wall thickness, and applied strain. For continuous hot-air exposure of heat-stabilized PA12 GF30, the time to 50% tensile strength loss is typically determined by accelerated aging at 150°C according to ISO 188. The exact hours for this S2 grade should be generated from the production lot; published data for this specific configuration is limited. The dry granulate condition does not guarantee long-term thermal stability, and natural uncolored parts may show visual discoloration before mechanical property loss becomes critical.

Chemical compatibility boundaries are defined by the glass sizing as well as the PA12 matrix. Strong mineral acids, phenols, oxidizing agents, and some chlorinated solvents can attack the polyamide backbone or the glass-matrix interface. Avoid combination with amine-based processing aids if they alter the heat-stabilization package. If post-mold annealing is required, it is normally performed at 120–140°C for 2–4 h in a nitrogen atmosphere; air annealing above 150°C can cause surface oxidation and yellowing of natural parts. For laser welding, natural glass-filled PA12 transmits and scatters the diode-laser wavelength, so weld strength should be validated on the actual joint geometry at weld depths of 0.3–0.5 mm. Ultrasonic welding requires pre-drying below 0.10% moisture to prevent steam pockets at the interface.

Lot release documentation for this grade typically includes density, tensile modulus, tensile stress at break, elongation at break, notched Charpy impact, and melt-volume flow rate or melt flow index. The safety data sheet and REACH statements accompany each commercial lot; substances on the REACH Candidate List are not intentionally added above 0.1% by weight, subject to the supplier’s current declaration. The ISO 1043 designation is PA12-GF30, and the ISO 11469 marking code is >PA12-GF30< for molded parts. The product is supplied dry; after opening, the granulate absorbs moisture from high-humidity shop air, so resealant packaging or immediate use after drying is recommended when the ambient relative humidity exceeds 60%.