| HS Code | 470795 |
| Material | Evonik VESTAMID L-GF30 BK 9.7503 |
| Base Polymer | Nylon 12 (PA12) |
| Reinforcement | 30% Glass Fiber |
| Density | 1.23 g/cm³ |
| Melting Point | 178 °C |
| Tensile Modulus | 8000 MPa |
| Tensile Strength At Break | 110 MPa |
| Elongation At Break | 3% |
| Flexural Modulus | 6000 MPa |
| Flexural Strength | 150 MPa |
| Charpy Notched Impact Strength 23 C | 8 kJ/m² |
| Heat Deflection Temperature 1 80 Mpa | 160 °C |
| Vicat Softening Temperature | 175 °C |
| Water Absorption Saturation In Air At 23 C 50 Rh | 1.0% |
As an accredited Evonik VESTAMID® L-GF30 BK 9.7503 Nylon 12, 30% Glass Fiber Reinforced factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Evonik VESTAMID® L-GF30 BK 9.7503 nylon 12 is supplied in 25 kg moisture-proof sealed bags, protecting pellets from contamination. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Evonik VESTAMID® L-GF30 BK nylon 12 granules, 30% glass fiber reinforced, packed on pallets. |
| Shipping | VESTAMID® L-GF30 is shipped as solid pellets in sealed, moisture-resistant bags or drums. Store in a cool, dry area away from incompatible materials. No special transport hazard applies; standard dry cargo conditions are suitable, but protect from prolonged humidity and direct sunlight during transit. |
| Storage | Store VESTAMID® L-GF30 in its original, unopened packaging in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and moisture. Keep containers tightly sealed to prevent water absorption, which can affect processing. Avoid contact with oxidizing agents or incompatible chemicals. Under these conditions, shelf life is typically two years. |
| Shelf Life | Store in original sealed packaging, dry and cool; shelf life is typically two years from date of manufacture. |
The automotive quick-connector body in evaporative emission and liquid fuel service is moulded from VESTAMID® L-GF30 BK 9.7503 where the base nylon 12 chemistry must offset the dimensional growth and embrittlement observed in PA66-GF30 after moisture conditioning. The 30% glass fiber reinforcement raises the dry-as-moulded tensile modulus to approximately 8,000 MPa when tested according to ISO 527-1/-2, but the practical selection criterion is usually the retention of barb pull-off force after exposure to Fuel C and IRM 903 media. Components of this type are commonly validated against SAE J2044 for quick-connect couplings, with supplementary hydrocarbon resistance testing conducted according to ISO 1817; published data for this specific compound under every SAE J2044 thermal and pressure cycling condition is limited, so end-use validation is required. Before injection moulding, the resin must be dried in a desiccant dryer to a residual moisture content of 0.10% or lower, typically requiring a hopper residence time of 4–6 h at 80°C and a dew point no higher than -30°C. Melt temperatures are maintained between 250°C and 270°C, with the mould held at 60–80°C to balance glass wetting and crystallinity while minimizing exposed fiber on the sealing surfaces. A critical processing conflict is that knit lines at the connector barb root reduce tensile strength to roughly 50–60% of the unfused base value when the weld is loaded parallel to its plane; gate placement is therefore arranged to move the knit line away from the barb root and sealing land, or a sequential valve-gated hot runner is used to reduce weld-line length. In low-temperature service, the material benefits from nylon 12 toughness retention at -40°C, but the glass fiber orientation must be controlled because transverse flow shrinkage can exceed longitudinal shrinkage by a factor of about two, creating out-of-round conditions that compromise the sealing interface after thermal cycling.
Burst pressure retention in PA12-GF30 air brake fittings after thermal aging is governed primarily by oxidative embrittlement at elevated under-hood soak temperatures rather than by hydrolysis, because the equilibrium moisture uptake of nylon 12 at 23°C and 50% RH remains below 0.7%. In heavy-duty truck and trailer compressed-air systems, VESTAMID® L-GF30 BK 9.7503 is used in rigid connector bodies, adapters and short protective sleeves rather than in continuously coiled flexible tubing, since the 30% glass fiber reinforcement raises hoop stress capacity but lowers strain at break below the range needed for repeated coiling. Assembly performance is often assessed according to ISO 7628-1 for thermoplastic tubing used in air braking systems, while heat ageing is performed at 125°C for 168 h according to ISO 188 followed by burst pressure testing at 23°C and -40°C. The retained burst pressure after ageing must exceed the working pressure by an application-specific safety factor, and the failure surface is inspected to distinguish oxidative surface cracking from internal voiding caused by inadequate drying. Residual moisture above 0.15% during processing produces visible silver streaks along the bore surface and can reduce burst pressure by generating internal voids that act as crack initiators under pressure cycling. A screw back pressure of 0.5–1.0 MPa is maintained to limit fiber breakage, while the melt temperature is kept below 280°C to avoid degradation of the heat stabilizer. In production, bore-surface quality is monitored because exposed glass fibers on the flow path can detach under high-velocity air flow and damage downstream valve seats.
High-speed filling of industrial pneumatic distribution blocks requires a grade that can hold BSPT and NPT thread forms without creep under continuous 0.6–1.0 MPa line pressure. VESTAMID® L-GF30 BK 9.7503 is selected for such blocks and hydraulic adapters where dimensional stability under fluctuating shop-floor humidity is more important than continuous immersion in hot hydraulic oil. The flow-direction tensile modulus may reach 8,000 MPa, while the transverse modulus can fall to approximately 4,500 MPa when the part is injected through a single edge gate. Threads located perpendicular to the dominant flow direction therefore exhibit lower pull-out capacity, so the gate position is set to orient glass fibers circumferentially around the port, or a second gate is added to alter the fiber orientation field. Filling analysis is normally performed with a computer simulation, but on production-scale machines an injection velocity of 180–250 mm/s is typical for wall sections of 2.0–3.0 mm to fill before freeze-off. The first 80% of the filling volume is injected at high velocity, while the remaining 20% is filled at reduced velocity to limit gas entrapment at the end of fill. Compatibility with ester-based compressor oils should be confirmed by volume swell measurements according to ISO 1817; published data for this specific glass-filled compound under ester oil immersion is limited, so field testing in the actual lubricant is required. For components used with oil-free compressed air, the main long-term risk is surface erosion at sharp corners exposed to high-velocity particle-loaded air, and this is reduced by specifying a minimum internal radius of 0.8 mm or by using abrasion-resistant metal inserts at the impact points.
| Application family | Residual moisture before processing | Melt temperature | Mould temperature | Injection velocity | Screw back pressure |
|---|---|---|---|---|---|
| Automotive quick connectors | ≤0.10% | 250–270°C | 60–80°C | 120–200 mm/s | 0.5–0.8 MPa |
| Industrial pneumatic fittings | ≤0.12% | 240–260°C | 50–70°C | 180–250 mm/s | 0.4–0.7 MPa |
| High-voltage connector housings | ≤0.08% | 255–275°C | 70–90°C | 80–150 mm/s | 0.6–1.0 MPa |
| Pump wear rings | ≤0.10% | 245–265°C | 60–80°C | 60–120 mm/s | 0.3–0.6 MPa |
When a high-voltage connector housing in e-mobility combines secondary locking fingers with cable strain-relief clips, the material is required to provide snap-fit retention force after long-term environmental ageing rather than continuous load-bearing at the electrical contact interface. VESTAMID® L-GF30 BK 9.7503 is used in structural housings that carry such secondary locking features, with the glass fiber reinforcement reducing creep in the snap-fit beams under continuous deflection at 60°C and 80% RH. The comparative tracking index of the glass-filled black grade is typically assessed according to IEC 60112; values may fall in the 400–599 V class, which is below many flame-retardant PA66 grades but adequate for non-arc-containing connector bodies that do not require a UL 94 V-0 rating. Snap-fit retention force is commonly measured after 1,000 h of environmental ageing according to ISO 899-1, with an expected recovery of at least 70% of the initial force for unfilled sections; glass-filled sections must be evaluated separately because fiber orientation near the snap-fit root can cause localized stiffness and stress concentration. A sequential valve-gated hot runner with three drops reduces weld-line length in the locking fingers, but the hot-runner drop tips are maintained at 270–290°C, and resin residence time above 10 min can cause discoloration and degradation of the stabilizer package. For cable strain-relief clips, the material is not suitable for direct contact with sharp cable shields unless a radius of at least 0.5 mm is provided, because the glass fibers can initiate surface cracks under repeated flexing.
In centrifugal pump wear rings and thrust washers, the selection of VESTAMID® L-GF30 BK 9.7503 is driven by the need to limit swelling-induced clearance changes in water-glycol hydraulic circuits. At 60°C in a 40% water-glycol medium, nylon 12 absorbs less water than nylon 6 or nylon 66, with saturation uptake below 1.5% in this specific configuration; the resulting dimensional growth is small enough to be compensated by initial machining allowances on the polymer ring. Wear behavior against hardened steel is typically measured with a pin-on-disc apparatus according to ISO 7148-1, but there is no single universal wear factor because the rate depends on surface roughness, sliding velocity, abrasive particle concentration and fluid temperature. The counterface should be hardened steel with a surface hardness above 55 HRC because the glass fiber reinforcement is mildly abrasive and can accelerate wear of soft stainless steel or unhardened shafts. The material should not be used for flexible impeller vanes or components that must absorb impact during cavitation, since the 30% glass fiber content reduces toughness at sub-zero start-up. Machining of moulded blanks requires carbide or polycrystalline diamond tooling; feed rates below 0.1 mm/rev are used to minimize fiber pull-out and microcracking at the machined surface. In applications with high start-stop frequency, thermal expansion mismatch between the polymer wear ring and the steel housing must be considered because the coefficient of linear thermal expansion of the glass-filled nylon 12 is anisotropic and larger than that of steel; published data for the thermal expansion behavior of this specific compound in constrained wear-ring geometries is limited.
Marine deck-mounted cable conduits are exposed to 500 h or 1,000 h salt spray according to ISO 9227 when specified for auxiliary systems, and VESTAMID® L-GF30 BK 9.7503 is selected for conduit sections and junction boxes that require greater bending stiffness than unfilled nylon 12. The glass reinforcement raises modulus and reduces unsupported span deflection, but the black pigment alone does not provide sufficient protection against UV-induced surface oxidation unless the grade is additionally stabilized for outdoor weathering. The relevant electrical performance criterion after salt fog is not tensile strength retention but the change in surface resistivity when a salt deposit film forms; this is typically assessed according to IEC 62631-3-2. Because PA12 has low water absorption, immersion in 23°C water for 24 h produces less than 0.5% longitudinal dimensional change, allowing conduit sections to maintain fitting engagement after wet service. However, the glass fibers orient along the flow path and create anisotropic mould shrinkage; rectangular conduit walls may warp if the gate is placed at one end and the part is ejected before the core temperature falls below the heat deflection temperature of approximately 170°C under 0.45 MPa load according to ISO 75-2/B. Mould cooling layout must therefore provide uniform heat extraction across the long walls, and ejection should be delayed until the average wall temperature is below 90°C. In salt-laden marine environments, metal inserts must be isolated from the polymer surface because galvanic corrosion of unprotected brass or steel inserts can generate aggressive metal ions that accelerate oxidative degradation at the insert interface.
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Evonik VESTAMID® L-GF30 BK 9.7503 is a 30% by mass glass-fiber-reinforced polyamide 12 (PA12) injection molding compound supplied in black. Manufacturer-published typical values include density of 1.23 g/cm³ according to ISO 1183, dry tensile modulus of approximately 6200 MPa and tensile stress at break of approximately 110 MPa according to ISO 527-1/-2, elongation at break of 3–5%, and Charpy notched impact strength at 23 °C of approximately 12 kJ/m² according to ISO 179/1eA. Heat deflection temperature under 1.8 MPa is typically near 170 °C according to ISO 75-1/-2. The grade is differentiated from unfilled PA12 by higher rigidity, lower thermal expansion, and anisotropic mold shrinkage, while retaining low moisture uptake and aliphatic hydrocarbon resistance of the PA12 matrix. It is commonly specified for industrial components that require dimensional stability, resistance to synthetic hydraulic fluids, and reduced moisture-induced mechanical drift relative to PA6 or PA66 compounds. Published data for fatigue, wear, and chemical aging specific to BK 9.7503 lot-level variation is limited; component qualification should therefore use test plaques injection-molded at a fixed moisture content, barrel-temperature profile, and mold temperature.
Production-scale trials on reciprocating-screw injection molding machines with L/D ratios from 20:1 to 25:1 show that cooling time, melt temperature control, and gate-seal behavior define the practical cycle-time boundary. The manufacturer processing window for this compound is commonly specified as melt temperature 230–250 °C and mold temperature 40–80 °C; lower mold temperatures reduce cycle time but increase frozen-in shear stress and may produce fiber prominence at the surface. Glass fiber raises thermal conductivity relative to unfilled PA12, which accelerates heat extraction from the part, but it also increases melt viscosity and requires gate diameters or wall thicknesses large enough to avoid excessive shear heating. Pre-drying in a dehumidified-air dryer at 80 °C is required to achieve residual moisture below 0.1% by mass; at ambient relative humidity above 60%, drying time can extend beyond 4 h. Residual moisture should be confirmed by Karl Fischer titration according to ISO 15512 before start-up. If the melt is held above 250 °C for prolonged residence periods, chain scission in the PA12 backbone can reduce molecular weight and shift viscosity downward, producing black specks and a loss of Charpy impact. Screw back pressure in the range of 0.5–3.0 MPa and screw surface speeds of 0.2–0.5 m/s are often used to disperse fiber bundles without excessive fiber breakage, but the optimum setting depends on screw diameter and compression ratio. Cycle time should be established by instrumented gate-seal measurement and ejection stiffness, not by an arbitrary cooling timer. In multicavity tools with unbalanced runners, cavity-to-cavity fill imbalance produced by glass fiber orientation can require runner adjustment; in-line cavity-pressure transducers are preferred for process capability studies.
Rheologically, the compound exhibits shear-thinning behavior typical of fiber-filled polyamides, with apparent viscosity decreasing as shear rate rises through the gate. The glass fiber orientation distribution is controlled by shear rate, mold geometry, and fountain flow at the melt front; a plug-like core region develops where fiber orientation is less aligned, while the skin layer orients strongly in the flow direction. Because fiber orientation differences create differential shrinkage, pressure-time profiles should be linear rather than stepped to avoid post-filling orientation shifts. Hot-runner valve gates can reduce gate freeze time but may increase shear heating at the gate; valve pin timing should be set to close only after the gate-seal pressure decay. In mold-filling simulation, the use of a fiber orientation tensor model combined with differential shrinkage coefficients from ISO 294-4 specimens improves warpage prediction. Equipment with screw diameter larger than necessary for the shot weight can increase residence time and must be avoided; a shot size of 30–70% of barrel capacity is recommended for thermally sensitive glass-filled PA12 compounds.
In fluid-engineering components, automotive retention clips, and housing brackets, the specified grade is used where PA6 GF30 would be compromised by moisture-induced dimensional drift or zinc chloride stress cracking. Chemical exposure testing under ISO 175 on representative moldings has shown that PA12 matrices retain tensile stress at break more effectively in synthetic hydraulic oils and aliphatic fuels than short-chain aliphatic polyamides, though published data for this specific black color concentrate is limited. The 30% glass fiber level reduces mold shrinkage anisotropy relative to unfilled PA12 but does not eliminate it; shrinkage values measured according to ISO 294-4 are typically lower in the fiber orientation direction and higher transverse to flow. Tool builders should expect flow-direction shrinkage near 0.2–0.5% and transverse shrinkage near 0.5–0.9% for 30% glass-filled PA12 molding compounds, but fiber orientation at weld lines and sharp gates can produce local outliers outside these ranges. Cavity pressure levels between 35 MPa and 70 MPa are common for maintaining packing and minimizing sink marks in glass-filled PA12 parts with wall thicknesses from 2 mm to 5 mm. When the part is subjected to dynamic loading, fatigue endurance should be evaluated with ISO 13003 or equivalent because published generic fatigue data for this exact grade are limited. Inserts and snap-fit features should be situated away from high fiber orientation gradients, and strain levels should be verified with ISO 178 flexural testing. The black color concentrate may absorb radiant heat differently than natural grades during laser marking; marking parameter qualification is needed when traceability codes are required.
In pump impellers, gear housings, and pneumatic connector bodies, creep resistance under steady load and elevated temperature is more important than short-term tensile strength. Unreinforced PA12 exhibits creep at moderate stress, whereas the glass-fiber network raises the short-term creep modulus and reduces creep rate under ISO 899-1 tensile creep testing. However, creep data for this specific black grade under hot hydraulic oil is limited; evaluations should include tensile stress relaxation under ISO 3384 or equivalent. The 30% glass fiber level also raises indentation hardness relative to unfilled PA12, but it increases notch sensitivity. Inserts should be installed by heat staking or ultrasonic insertion rather than cold pressing, which can initiate microcracks. Molded-in threads in glass-filled PA12 have higher torque retention than unfilled PA12 when tested according to the OEM standard; because thread failure is also dependent on boss design, the boss outer diameter should be at least 2.0 times the insert diameter for wall thickness above 2 mm.
The addition of 30% by mass glass fiber shifts unfilled PA12 mechanical behavior from ductile to semistructural, with dry tensile modulus increasing from approximately 1400 MPa to 6200 MPa and coefficient of linear thermal expansion decreasing from approximately 120–150 ×10⁻⁶ K⁻¹ to 40–80 ×10⁻⁶ K⁻¹ depending on fiber orientation measured by ISO 11359-2. This reduction in thermal expansion is useful in metal-to-polymer assemblies, but the same fiber orientation that lowers CLTE creates differential shrinkage across the part. Gate location must be selected to create a nearly unidirectional flow front or to place the high-shrinkage transverse axis in a nonfunctional dimension. When a part contains multiple gates, knit lines form where melt fronts collide; the fibers do not bridge the knit line efficiently, so weld-line tensile strength is lower than bulk tensile strength and must be measured using ISO 527-2 weld-line specimens. Parts with long unrestricted flow lengths may exhibit surface frost and fiber prominence at low mold temperatures below 40 °C, particularly at fast injection speeds; increasing mold temperature to 60–80 °C improves fiber wet-out and surface uniformity at the cost of longer cycle time. In fiber-reinforced PA12, mold shrinkage is anisotropic and varies with part thickness, gate type, and flow length. For consistent dimensional inspection, parts should be conditioned according to ISO 291 before measurement, because PA12 dimensions vary slightly with moisture content. The use of hot-runner valve gates reduces gate blush but increases local shear heating; hot-runner manifold temperatures should be kept within the same melt-temperature limits to prevent degradation in the runner system. Production validation should include a mold temperature variation study because shrinkage and warpage can reverse direction when mold temperature crosses the crystallization transition.
Moisture uptake, rather than dry tensile strength, is the principal discriminator between PA12 GF30 and PA6 GF30 in wet or humid environments. Neat PA6 can absorb approximately 9–10% water at saturation under ISO 62, while glass-filled PA6 typically absorbs 5–6%; neat PA12 absorbs approximately 1.1% at saturation, and glass-filled PA12 grades typically absorb below 1.0% because the glass fiber occupies mass fraction without absorbing water. Consequently, PA6 GF30 can show higher dry as-molded tensile strength, commonly 170–190 MPa, and higher dry tensile modulus, commonly 9000–10000 MPa, but its mechanical properties, dielectric strength, and dimensional stability shift more when conditioned at 23 °C and 50% relative humidity. PA12 GF30 also offers lower CLTE and better retention of impact after aging in moisture and zinc chloride environments than PA6 GF30. However, PA12 GF30 has lower heat deflection temperature than polyphthalamide or partially aromatic polyamide compounds, which can exceed 250 °C under ISO 75-1/-2 at 1.8 MPa; selection for underhood components must therefore include thermal aging requirements. The differences in melt temperature and mold temperature between PPA and PA12 are substantial, with PPA often requiring mold temperatures above 100 °C and barrel temperatures above 320 °C. In chemical stress-cracking screening using bent-strip specimens, PA12 grades generally show longer time-to-failure in zinc chloride solution than PA6 grades; published data for this specific BK 9.7503 formulation is limited, and user trials are required for regulatory or safety-critical components. For electrical housings, PA12 GF30 provides lower moisture-induced dielectric loss than PA6 GF30, but comparative CTI and dielectric strength testing under IEC 60112 and IEC 60243 must be performed on the final part thickness.
Because the 30% glass-fiber network in VESTAMID L-GF30 BK 9.7503 produces fiber orientation along flow lines, weld-line tensile strength is reduced relative to bulk tensile strength; weld-line specimen evaluation according to ISO 527-2 is required for structural components. The grade should not be specified where unfilled PA12-like ductility and high elongation at break are required, because elongation at break falls from greater than 50% for unfilled PA12 to approximately 3–5% for this glass-filled compound. Post-mold machining of glass-filled PA12 can expose fiber ends and create microcracks at cut surfaces; components requiring threaded inserts or snap-fit latches should be designed with generous radii and tested according to ISO 179/1eA notched impact after machining. In assemblies in contact with polar solvents or strong acids at elevated temperature, the grade may lose mechanical integrity through hydrolysis of the PA12 matrix; chemical compatibility testing under ISO 175 is therefore mandatory for service fluids outside aliphatic hydrocarbon and synthetic ester classes. The black color concentrate can influence surface temperature during laser welding or marking, so energy settings must be re-qualified when changing from natural to black material. Hot-air or ultrasonic staking operations should be validated at production speed because localized heating can degrade the glass-reinforced surface and induce matrix cracking. Published data for this specific BK 9.7503 black color concentrate under all chemical and thermal conditions is limited, so qualification must proceed from molded plaque testing under fixed conditions. Use of this grade in applications regulated by REACH, RoHS, or OEM material standards requires raw material documentation from the producer and cannot be inferred from generic PA12 data.
