| HS Code | 768786 |
| Density | 1.11 g/cm³ |
| Molding Shrinkage | 0.2 - 0.4 % |
| Tensile Modulus | 3000 MPa |
| Tensile Strength | 50 MPa |
| Elongation At Break | 20 % |
| Charpy Notched Impact 23 C | 4 kJ/m² |
| Melting Point | 178 °C |
| Heat Deflection Temperature 1 8 Mpa | 65 °C |
| Vicat Softening Temperature B50 | 145 °C |
| Water Absorption 24h | 0.2 % |
| Water Absorption Saturation | 1.4 % |
As an accredited EMS-Grivory Grilamid® L 20 G HL PA12 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg moisture-proof bags as translucent PA12 granules, ready for injection molding and processing. |
| Container Loading (20′ FCL) | Load 20′ FCL with palletized 25 kg bags of Grilamid® L 20 G HL PA12, ensuring secure, dry, ventilated stowage. |
| Shipping | Grilamid® L 20 G HL PA12 is typically shipped as solid granules in sealed moisture-barrier bags, drums, or bulk containers. Avoid moisture and excessive heat. Transport via standard freight (truck, rail, container) in dry conditions. Non-hazardous per regulations, but keep away from incompatible materials. Handle with care to prevent bag damage. |
| Storage | Store Grilamid® L 20 G HL PA12 in its original, unopened packaging in a cool, dry place. Keep away from direct sunlight, heat sources, and moisture. Reseal partially used containers tightly. Recommended storage temperature is below 30°C; dry conditions prevent moisture absorption that could affect processing. |
| Shelf Life | Store dry, sealed in original packaging, away from heat and moisture. Shelf life is typically two years from delivery date. |
Within low-permeation gasoline fuel systems, EMS-Grivory Grilamid® L 20 G HL PA12 is specified for quick-connect coupling bodies, retainer clips, and fuel filler neck brackets where continuous exposure to 10–25 vol% ethanol-blended gasoline, underbonnet thermal load, and repeated assembly force must not produce dimensional drift or stress cracking. The compound is processed as-supplied; glass content is fixed at 20 wt% by mass and controlled by ISO 1172 residue analysis. In safety-critical fuel couplings, regrind addition is limited to 15 wt% because higher regrind fractions reduce fibre length and notched impact resistance; black masterbatch based on a PA12 carrier is added at 0.5–1.5 wt%, while external release masterbatch must not exceed 2.0 wt% to avoid weld-line strength loss. Injection moulding on 80–120 t hydraulic machines with closed-loop tie-bar force monitoring uses melt temperatures of 245–270°C at the nozzle and mould surface temperatures of 80–100°C; pre-drying at 80°C for 4–12 h to a residual moisture below 0.10% measured by ISO 15512 is mandatory when ambient relative humidity exceeds 60%. A three-zone alloy-steel screw with L/D ratio of 20:1 and compression ratio of 2.2:1 is used, with screw speed held at 80–120 min−1. Hot-runner systems with 0.8–1.2 mm valve gates are preferred, and fill times below 1.2 s for 2.0 mm wall stock are maintained to prevent premature freeze-off. The compliance anchor is SAE J2044 for fuel system quick connectors; when the connector is part of a low-emission fuel vapour line, the assembly is validated to SAE J2260 permeation and emission limits. Terminal parts include quick-connect coupling bodies, retainer clips, canister mounting brackets, and filler neck spacers. Operational boundaries include avoidance of zinc chloride stress-cracking agents from road salt and galvanized counter plates; PVC gaskets containing plasticizer should not be used in direct contact. Long residence times above 10 min at 270°C must be avoided because glass-reinforced PA12 shows surface black specks and viscosity loss under shear heating. Published data for methanol blends above 5 vol% is limited; component-level validation is required before specification.
Compressed-air push-in coupling bodies and manifold blocks produced from the heat-stabilised 20 wt% glass-fibre-reinforced PA12 grade operate in systems where continuous service temperatures of 80–85°C and intermittent temperatures of 100°C intersect with humidity, compressor oil mist, and pressure pulsation. The compound is used without further glass addition; regrind content is limited to 20 wt% for non-safety couplings and 10 wt% for pressure-bearing bodies with a nominal burst safety factor of 4:1. A PA12 carrier masterbatch for UV stabilisation or colour is added at 1–2 wt%, and glass content after moulding is verified by ISO 1172 residue method to remain within 19–21 wt%. Production is performed in multi-cavity hydraulically clamped moulds with 0.6–0.8 mm pin-point gates; melt temperature at the injection nozzle is held at 250–270°C, mould surface temperature at 80–100°C, and hold pressure is profiled from 60 MPa to 80 MPa for 3–5 s to compensate fibre orientation shrinkage. Pre-drying at 80°C to less than 0.10% moisture is required; in plants where regrind is stored in open containers at relative humidity above 60%, drying time is extended to 12 h. Pressure cycling at 0–1.0 MPa and 25–85°C for 500,000 cycles is a standard screening condition for coupling bodies; production-scale failure modes include barb thread shearing at the gate when hold pressure falls below 60 MPa. The parts are verified to ISO 14743:2004 for push-in connectors for thermoplastic tubes and to the compressed-air purity requirements of ISO 8573-1:2010 where oil carryover is limited to 0.01 mg/m³. Terminal products include push-in coupling bodies, threaded adapters, multi-port manifolds, and compressed-air brake system connectors, excluding primary brake circuits unless homologated separately. Heat-ageing screening according to ISO 2578 at 100°C for 1,000 h is used before burst-test validation; published data for this specific coupling geometry and pressure cycling beyond 1.5× rated pressure is limited. Avoid combination with phosphoric acid ester fire-resistant hydraulic fluids during machining trials; prolonged immersion can reduce surface hardness at weld lines.
| Application segment | Compliance anchor | Test standard | Recommended processing window |
|---|---|---|---|
| Fuel quick connectors | SAE J2044 | ISO 1172 | 245–270°C melt / 80–100°C mould |
| Pneumatic coupling bodies | ISO 14743:2004 | ISO 15512 | 250–270°C melt / 80–100°C mould |
| Water-treatment pump components | ISO 1817:2015 | ISO 62:2008 | 250–270°C melt / 100°C mould |
| Electrical connector shells | IEC 60695-2-11:2014 | ISO 294-4:2018 | 245–270°C melt / 80–100°C mould |
| Thin-wall gear covers | ISO 179-1/1eA | ISO 527-2 | 250–270°C melt / 80–100°C mould |
Where process-water pump impellers and dosing-pump valve bodies are converted from bronze, PPS, or PVDF, the low equilibrium water absorption of PA12 at 50% RH—approximately 0.7% for unfilled PA12 and lower for the 20 wt% glass-filled grade under ISO 62:2008 conditions—reduces the dimensional instability caused by water plasticisation. The compound is used as supplied, with no additional glass fibre; carbon black or UV masterbatch is added at 0.5–1.5 wt% for outdoor installations, and regrind is limited to 15 wt% for thick-wall impeller hubs due to void formation and inconsistent shrink. Moulding of 4.0 mm sections uses melt temperatures of 250–270°C, a mould surface temperature of 100°C, screw back pressure of 60–100 bar, and cooling time of 20–30 s to avoid sink marks and crystallinity gradients. Immersion testing per ISO 1817:2015 is used for chemical resistance evaluation; published data for this specific grade in demineralised water at 40°C for 1,000 h is limited, and end-user validation is required before replacing metal parts. Product-specific certification to NSF/ANSI 61 for potable water contact is not assumed and must be confirmed on the finished moulding. Terminal finished parts include centrifugal pump impellers, dosing-pump valve bodies, filter housings, and mechanical seal retainers. Avoid installation with solvent cement containing tetrahydrofuran or concentrated acetic acid; both induce localised swelling and stress cracking at weld lines. Machining trials should not use mineral-oil-based cutting fluids that discolour the glass-reinforced surface; dry or water-mist machining is preferred.
Because the 20 wt% glass-fibre content shifts melt viscosity and creates flow-induced anisotropy, multi-gated electrical connector shells and sensor enclosures require gate placement outside load-bearing snap-fit regions. The material is injection moulded at melt temperatures of 245–270°C and mould surface temperatures of 80–100°C; high injection speeds of 120–180 mm/s and fill times below 0.8 s are used for 1.5 mm walls to maintain an uninterrupted flow front. Glass content is fixed at 20 wt%; colour masterbatch in a PA12 carrier is added at 1–3 wt%, and regrind is limited to 30 wt% only for non-visible, non-load-bearing housing sections. For parts in unattended electrical equipment, glow-wire flammability is evaluated according to IEC 60695-2-11:2014; shrinkage control is specified by ISO 294-4:2018 and should be measured on a 60 mm × 60 mm plaque after 24 h at 23°C. The addition of halogen-free flame-retardant masterbatches changes comparative tracking index and glow-wire ignition temperature; such modifications must be re-certified on the finished part. Terminal products include sensor enclosures, low-voltage connector shells, cable ducts, and terminal block housings. Knit-line impact values measured by ISO 179-1/1eA are typically 40–60% lower than gate-free zones in glass-reinforced polyamide; published data for this specific grade and multi-gated geometry is limited, so prototype validation with flow simulation and short-shot analysis is required. Pre-drying at 80°C to below 0.10% moisture per ISO 15512 is mandatory before processing, especially in Asia-Pacific plants where ambient humidity regularly exceeds 60%.
For glass-filled PA12, fibre attrition during screw plastication increases when screw speeds exceed 150 min−1 and back pressure exceeds 100 bar, producing black specks, melt viscosity drift, and mechanical property drop in thin-wall power-tool gear covers and handle shells. The grade contains 20 wt% glass; no supplementary fibre or impact modifier is added. Regrind from hot-runner sprues is limited to 20 wt% because fibre length reduction below 0.25 mm reduces notched Charpy impact measured by ISO 179-1/1eA. Injection moulding of 1.5–2.0 mm walls uses melt temperatures of 250–270°C, mould surface temperatures of 90–100°C, fill times below 0.5 s, and screw speeds of 80–120 min−1 to balance homogenisation and fibre length retention. Tensile property verification is performed to ISO 527-2; batch-to-batch melt viscosity variation at 235°C/5 kg by ISO 1133-1:2022 should remain within ±10% of the virgin MVR before regrind batches are released. Terminal finished parts include gear covers, handle shells, pump covers, and fan shrouds. Operation is constrained by a practical processing window of ±5°C around the 260°C mid-range: below 245°C gate freeze and short shots occur, while above 270°C surface black specks and gate stringing are observed on production-scale 100 t machines. Published data for this specific grade under power-tool vibration testing is limited; accelerated life testing according to IEC 62841-1 or the ISO 28927 series is required before shipping.
Competitive EMS-Grivory Grilamid® L 20 G HL PA12 prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615365186327 or mail to admin@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8615365186327
Email: admin@ascent-chem.com
Flexible payment, competitive price, premium service - Inquire now!
EMS-Grivory Grilamid® L 20 G HL is a heat-stabilised, 20% glass-fibre-reinforced polyamide 12 injection moulding grade. The material combines the low moisture uptake and broad chemical resistance of PA12 with a dispersed glass-fibre phase that increases stiffness, reduces creep and restricts shrinkage. Under ISO 1043:2011, the designation PA12-GF20 identifies the polymer family and glass-fibre content; the HL suffix denotes the heat-stabilisation package. The grade is supplied as cylindrical pellets and is typically moulded into fluid-handling components, pneumatic connectors, pump housings, valve bodies, snap-fit fasteners and structural brackets where dimensional stability in humid or variable-temperature service is required.
The polymer backbone is a semi-crystalline polyamide 12, produced from laurolactam or ω-aminolauric acid. The glass content is nominal 20% by weight, producing a density of approximately 1.16 g/cm³ by ISO 1183-1. The heat-stabilised variant is intended for applications in which short-term contact with elevated air temperatures or frictional heating would degrade an unstabilised PA12. Representative physical, mechanical and thermal values for natural-grade material are summarised in Table 1. Conditioned values refer to equilibrium at 23 °C and 50% relative humidity per ISO 291 unless otherwise specified.
| Property | Test method | Unit | Dry | Conditioned |
|---|---|---|---|---|
| Density | ISO 1183-1 | g/cm³ | 1.16 | — |
| Water absorption at saturation in water 23 °C | ISO 62 | % | — | 1.3–1.4 |
| Tensile modulus | ISO 527-1/-2 | MPa | 2600 | 1600 |
| Tensile stress at break | ISO 527-1/-2 | MPa | 70 | 45 |
| Elongation at break | ISO 527-1/-2 | % | 6 | 12 |
| Charpy notched impact strength 23 °C | ISO 179-1/1eA | kJ/m² | 9 | 12 |
| Melting point | ISO 11357-1/-3 | °C | 178 | — |
| Heat deflection temperature 1.8 MPa | ISO 75-1/-2 | °C | 160 | — |
| Heat deflection temperature 0.45 MPa | ISO 75-1/-2 | °C | 170 | — |
Pigmented and black variants may shift tensile modulus and impact strength by several percent because of pigment nucleation and fibre sizing. The manufacturer’s current ISO-based certificate should therefore replace representative values for production qualification. The melt volume-flow rate is determined by ISO 1133-1; values should be taken from the delivery certificate because glass-fibre attrition and moisture content influence flow.
The reinforcement phase raises dry tensile modulus from an unfilled PA12 value of roughly 1400 MPa to approximately 2600 MPa, while tensile stress at break is in the range of 70 MPa dry and 45 MPa conditioned. The trade-off is a reduction in elongation at break from ductile values above 200% for unfilled PA12 to approximately 6% in dry moulded specimens. Heat deflection temperature under 1.8 MPa rises from about 50 °C to approximately 160 °C, shifting the short-term thermal deformation limit closer to that of other glass-reinforced engineering plastics.
On a conventional reciprocating-screw injection moulding machine, glass fibres orient in the flow direction during cavity filling. The moulding develops a layered skin-core structure: fibres near the frozen wall align with the flow front, while the core may contain more transverse or random orientation. This morphology produces anisotropic shrinkage. Flow-direction mould shrinkage is commonly lower than transverse shrinkage by a factor of 2 to 3, depending on gate location, wall thickness and packing pressure. Weld lines are strength-limiting zones because fibres align parallel to the interface rather than across it; tensile strength at a weld line should not be assumed to reach the un-welded value without component testing under ISO 527-1/-2.
PA12 has a glass transition in the range of 40–50 °C. Low-temperature impact resistance is nevertheless often better than PA6 or PA66 because the longer aliphatic chain imparts chain mobility at sub-zero temperatures. Published data for this exact glass-filled PA12 formulation under cyclic loading are limited; component-level fatigue testing is therefore required for parts subject to repeated mechanical stress.
The moisture-regain characteristics of PA12 distinguish this grade from PA6 and PA66. Saturation water uptake by ISO 62 for PA12-GF20 is approximately 1.3% to 1.4% by weight, whereas conventional PA6 and PA66 glass-filled grades absorb on the order of 5% to 7% at saturation. The lower equilibrium moisture content reduces dimensional growth and preserves mechanical properties in humid environments that would plasticise short-chain aliphatic polyamides. Water acts as a plasticiser in the amorphous phase; at 50% relative humidity, the conditioned tensile modulus is approximately 60% of the dry value. Design calculations for snap-fit deflection or bolt torque retention should use conditioned modulus rather than dry values for parts exposed to ambient humidity.
Compared with PA66-GF20, the PA12-GF20 HL grade has a lower density and a lower saturated moisture uptake, but it also has a lower dry tensile modulus and a lower heat deflection temperature. PA66-GF20 can exhibit dry tensile modulus above 5000 MPa and HDT/A values above 240 °C; the PA12 grade is positioned below those values with density 1.16 g/cm³ and HDT/A near 160 °C. Selection between these materials should therefore balance the need for dimensional stability in wet environments against the need for high-temperature structural stiffness.
Typical moulded components include pneumatic fittings, fuel-system clips, valve bodies, filter housings, cable glands and mechanical levers. In compressed-air applications, the glass fibres reduce creep under internal pressure; in snap-fit designs, the low moisture uptake preserves retention force after humidity cycling. For pressure-containing parts, long-term hydrostatic strength should be evaluated under ISO 9080 when the component functions as part of a piping system.
Residual moisture must be reduced to below 0.10% by weight before melt processing to suppress hydrolysis and surface splay. A dehumidified-air dryer operating at 80 °C for 4 to 8 hours with a dew point no higher than −30 °C is appropriate. Material stored in open containers above 60% relative humidity for more than 2 hours should be re-dried before moulding. Throat temperature should be maintained low enough to prevent bridging, typically 40–60 °C, because PA12 pellets can soften when heated.
A flat or slightly rising barrel profile is used. Measured melt temperature at the nozzle should be held between 240 °C and 270 °C for natural grade; the upper limit is 280 °C, above which the heat stabiliser is consumed by oxidative degradation and Charpy impact strength can decline. Tool surface temperature should be controlled between 40 °C and 80 °C. Lower tool temperatures may quench the skin and produce post-mould crystallisation and dimensional drift. Higher tool temperatures improve surface gloss and spherulite uniformity but increase cycle time. A tool temperature tolerance of ±5 °C is a practical operating boundary for close-tolerance parts.
Screw selection and residence time are operational boundaries. Low-to-medium compression screws with L/D 18–22 and compression ratio 1.5–2.0 reduce shear heating. On screws from 20 to 40 mm, screw speed is commonly kept below 300 rpm and back pressure below 50 bar to avoid excessive melt temperature rise. Cumulative residence time at melt temperature should remain below 10 minutes; longer residence degrades impact strength and can produce visible yellowing. Clamp force requirements for PA12-GF20 parts are typically 3–5 kN/cm² of projected area. Production-scale experience indicates that glass-filled PA12 grades are mildly abrasive; continuous moulding lines benefit from nitrided screws and bimetallic barrels because screw wear can reduce fibre length and lower tensile modulus in moulded specimens.
The PA12 matrix resists many aliphatic hydrocarbons, oils, greases, fuels and alkaline solutions, but strong mineral acids, phenolic compounds and oxidising media can degrade the polymer. Chlorinated solvents may induce environmental stress cracking in stressed parts through physical swelling; suitability should be tested under ISO 22088-2 or ASTM D1693 on the final moulded article. Because the glass-fibre reinforcement is surrounded by a silane-based sizing, prolonged exposure to hot water or steam above 80 °C can attack the fibre-matrix interface and reduce tensile strength. Hydrolysis of the polyamide backbone is slower than for PA6 or PA66, but it is not zero; continuous immersion in water at elevated temperature should be validated by immersion testing under ISO 1817 or vendor-specific protocols before product release.
Food-contact status is formulation-dependent. Natural PA12 grades may be evaluated under FDA 21 CFR 177.1500 for nylon resins, but glass-fibre reinforcement and the heat-stabiliser package require separate clearance, and migration limits apply under EU Regulation 10/2011. Electrical and electronic equipment uses must satisfy RoHS Directive 2011/65/EU; restricted substances such as lead, mercury, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers are limited to 0.10% by weight in homogeneous materials, while cadmium is limited to 0.01%. Under REACH EC 1907/2006, Article 33 communication is required only if a Candidate List substance exceeds 0.10% w/w in the article. Flammability classification is typically UL 94 HB at 1.5 mm thickness for natural PA12-GF20; the certificate for the exact colour and grade must be consulted.
Moulded parts from this grade are encountered in compressed-air fittings, fluid reservoirs, pump housings, valve bodies, cable glands and clips. Each application should be qualified on the final tool because gate location, fibre orientation and weld-line placement control the achieved mechanical properties. Component-level fatigue characterisation remains necessary for load-bearing applications because published S-N data for this exact glass-filled PA12 formulation are limited.
