| HS Code | 201793 |
| Material | EMS-Grivory Grilamid TR 55 LX Nylon 12 |
| Condition | Conditioned |
| Density | 1.06 g/cm³ |
| Tensile Modulus | 1700 MPa |
| Tensile Strength At Yield | 55 MPa |
| Elongation At Break | 50% |
| Flexural Modulus | 1500 MPa |
| Charpy Notched Impact Strength 23 C | 20 kJ/m² |
| Glass Transition Temperature | 125 °C |
| Melting Point | 205 °C |
| Heat Deflection Temperature 1 80 Mpa | 80 °C |
| Water Absorption 24h | 0.3% |
As an accredited EMS-Grivory Grilamid TR 55 LX Nylon 12, Conditioned factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | EMS-Grivory Grilamid TR 55 LX Nylon 12, Conditioned is supplied as dried pellets in sealed 25 kg moisture-proof bags. |
| Container Loading (20′ FCL) | Load about 20 metric tons of conditioned Grilamid TR 55 LX pellets into a 20-ft container, using palletized FIBCs, secured and ventilated. |
| Shipping | Ships in sealed moisture-barrier bags inside sturdy fiber drums or cartons to protect the conditioned nylon 12 pellets from humidity. Classified non-hazardous for transport (DOT/IMDG), it can move via standard ground or air freight. Store away from heat and moisture; keep containers tightly closed until use. |
| Storage | Store in original sealed packaging in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and UV exposure. Keep containers tightly closed to prevent moisture absorption, as nylon 12 can uptake humidity. Avoid contact with oxidizing agents. Maintain moderate room temperature and stable conditions to preserve material properties. |
| Shelf Life | Store in original sealed container, cool and dry. Shelf life is typically two years from manufacture if unopened. |
When transparent amorphous polyamide 12 is conditioned to equilibrium at 23 °C/50% RH per ISO 1110, absorbed water disrupts intermolecular hydrogen bonding and shifts the stress-strain response away from dry, glassy behaviour. The conditioned value of tensile modulus falls below the dry datasheet value, while elongation at break and notched Charpy impact energy increase. These changes are directly relevant to multi-lumen catheter hubs, luer activators, and stopcock bodies that are inserted onto barbed ports. The lower modulus reduces axial push-on force and lowers the risk of circumferential cracking at the hub base after repeated connection cycles. In small-bore connectors tested under ISO 80369-1:2018 and ISO 80369-7:2018, dimensional checks are performed after conditioning because the absorbed moisture produces measurable diameter and taper movement.
Injection moulding of these components uses valve-gated hot runners with short gate vestiges to avoid blood-contact surface defects. The grade is dried to 0.10% maximum residual moisture in a desiccant dryer at 80 °C for 4–6 h before moulding. Blown-in moisture at the feed throat is a common production-floor fault: dew points above −25 °C produce splay on thin Luer taper walls. Cavitation is typically 8–32 cavities, and clamp force is sized from a projected-area requirement of 0.7–1.0 kN/cm², with higher tonnage reserved for hot-runner manifold balance. The screw is a general-purpose three-zone configuration with 20:1–25:1 L/D; recovery time increases when the barrel temperature is set below 240 °C. Shot volume is maintained at 60–80% of barrel capacity to limit residence. Holding pressure transfers to pack at 95–99% of the fill volume, and holding time is set to freeze the gate. The melt temperature at the nozzle is maintained in the range of 240–280 °C, and the mould temperature is held at 60–90 °C to control surface haze and post-mould shrinkage.
| Application context | Standard / clause | Test parameter | Condition reported |
|---|---|---|---|
| Medical small-bore connectors | ISO 80369-1:2018 | Dimensional and leak tightness | 23 °C/50% RH |
| Cytotoxicity, fluid path | ISO 10993-5:2009 | L929 fibroblast viability | 24 h extract at 37 °C |
| Sensitisation, skin-contact housings | ISO 10993-10:2010 | Maximisation or LLNA | Polar and non-polar extracts |
Dimensional change after conditioning is not isotropic in moulded sensor cover plates. The wall thickness direction absorbs moisture faster than the long flow direction, producing a temporary bow that can exceed 0.05 mm across a 40 mm span when parts are assembled before equilibrium. This is a production issue in automotive camera modules and LiDAR sensor windows where a metal housing is overmoulded or press-fitted. The difference in coefficient of linear thermal expansion between the polymer and aluminium is compounded by hygroscopic swelling after conditioning. For transparent amorphous polyamide 12, linear moisture expansion can produce 0.2–0.4% dimensional increase when moved from dry-as-moulded to equilibrium at 23 °C/50% RH. The design response is to specify radial gaps at insert interfaces that account for both thermal expansion per ISO 11359-2 and moisture-induced elongation per ISO 62.
Optical haze in sensor covers is influenced by mould temperature and post-mould annealing. Mould temperatures below 60 °C freeze the surface skin before the core can relax, leaving residual flow-induced orientation that appears as birefringence under polarised light. Annealing at 80–100 °C for 30–60 min after ejection reduces this orientation and stabilises the part before conditioning. If annealing is skipped, the conditioned part can show anisotropic shrinkage over the first 72 h after moisture exposure. In production, the covers are placed on flat cooling racks during annealing because unsupported panels deform under their own weight at the upper end of the annealing range. Dimensional stability claims must be verified on the conditioned part, not on dry-as-moulded samples.
Coffee machine flow meter housings and water filter sight glasses expose the grade to intermittent hot water at 85 °C, citric acid descaling solutions, and chloramine residuals in municipal water. The conditioned equilibrium water content is lower than that of PA6 or PA66, which limits the reversible swelling that opens sealing gaps around overmoulded O-rings. In transparent shut-off valves used for automatic espresso machines, the material is selected for its resistance to stress cracking after repeated exposure to hot water and coffee oils. It is not a universal food-contact replacement: prolonged exposure to boiling acetic acid or concentrated fruit juice concentrates can etch the surface and reduce transparency, and the material should not be specified for continuous immersion above 95 °C in aggressive cleaning regimes.
Under EU Regulation 10/2011 and FDA 21 CFR 177.1500, the grade is used as a food-contact polymer only when the finished article passes overall migration and specific migration limits for the intended simulant and contact time. The migration test is performed on the conditioned moulded article, not on dried resin pellets. For aqueous food contact, distilled water and 3% acetic acid are typical simulants; for fatty foods, olive oil or the substitute is required depending on the surface-to-volume ratio. Practical failures in this segment are often not chemical but mechanical: hot-water manifold parts with unsupported bosses can creep after prolonged exposure, so boss diameters are increased or metallic inserts are specified when the component is mounted with self-tapping screws.
| Regulatory requirement | Standard | Test condition | Reference value |
|---|---|---|---|
| Overall migration, food contact plastics | EU 10/2011 | Simulant D2 3% acetic acid, 70 °C/2 h | 10 mg/dm² |
| Nylon resin extractives | FDA 21 CFR 177.1500 | Boiling water and heptane extraction | Specified extracted fraction in section 177.1500 |
Quaternary ammonium disinfectant concentrates used in hospital wipe-down protocols are a harsher environment than the diluted use concentration applied to device surfaces. Diluted solutions at 0.1–0.5% active quaternary ammonium compound show negligible visual attack on conditioned transparent polyamide 12 after 1,000 contact cycles in a wipe simulation, but concentrates and prolonged puddling at connector threads can lead to microcrazing under residual moulded-in stress. This behaviour is evaluated using ISO 22088 with a strain jig under constant outer-fibre strain. The conditioned grade has lower modulus than dry material, which can reduce stress magnitude at the same imposed strain and improve resistance in stress-cracking tests against some polar organic compounds. However, it remains incompatible with strong inorganic acids, phenolic disinfectants, and chlorinated solvents that swell the amorphous phase. Published data for this specific configuration is limited for full immersion in concentrated disinfectant.
In spectacle frames and cosmetic packaging closures, repeated contact with ethylhexyl palmitate, oleic acid, and sebum creates a lipid-loaded surface environment. The material is selected over transparent polycarbonate in these applications because of its higher resistance to crazing in emollient-rich formulations, but the trade-off is surface hardness and scratch resistance. Hard coatings are applied by dip or spray after moulding, and the adhesion of the coating is tested after conditioning to 23 °C/50% RH because moisture at the surface may hydrolyse silane coupling agents used in the primer. The production sequence matters: coating adhesion drops if the component is conditioned before corona or plasma pre-treatment, so the line is arranged to coat immediately after drying and annealing.
In thin-wall electronic covers with wall stock below 0.8 mm, the melt temperature at the nozzle is the dominant variable controlling flow length and surface gloss. At nozzle settings below 240 °C, the viscosity of transparent amorphous polyamide 12 increases sufficiently to cause short shots at the end of fill in 0.6 mm ribs and snap-fit windows, particularly in multi-cavity tools with runner lengths above 80 mm. The process window is narrow. Injection speed is set so that the flow front velocity remains above 250 mm/s but below the threshold where shear heating in the gate produces local yellowing. Shear rates in pin gates and film gates exceeding 100,000 s−1 can generate flow marks and optical haze in transparent parts.
Mould temperature in this segment is maintained at 60–80 °C, which is below the glass transition and allows the polymer skin to solidify rapidly. Rapid skin formation freezes orientation and produces birefringence that is visible under polarised light, an issue for light-guiding covers and optical sensor windows. Annealing at 80–100 °C for 30–60 min after ejection reduces birefringence and stabilises the part before conditioning. For electronic connectors, the comparative tracking index and glow-wire ignition temperature are not assumed from resin data sheets; they must be validated on the final part at the minimum wall thickness. The material is not a direct drop-in for polycarbonate in electrical enclosure approvals because flammability grouping and glow-wire performance differ by wall section and conditioning state.
Aircraft ground service equipment uses transparent sight glasses in fuel sampling lines where aromatic content in Jet A-1 remains below 25 vol% under normal fuel specifications. Immersion testing per ISO 175 shows that mass uptake in conditioned transparent polyamide 12 remains below 1.5% after 1,000 h at 40 °C in aliphatic hydrocarbons, but the same material swells measurably when aromatic content exceeds the threshold. In practice, this means the sight glass must not be specified for direct contact with high-aromatic gasoline, chlorinated brake cleaners, or phosphate ester hydraulic fluids. The conditioned state contributes to impact resistance during low-temperature servicing, but does not alter the solubility parameter limit of the polymer matrix.
Hydraulic test stands and fuel drainage carts use the transparent grade for float chambers and visual level indicators because the material retains clarity in contact with mineral oil mists and diesel fuel fractions. The limiting parameter in service is not tensile strength but dimensional fit: when the component is assembled with pressed-in metal sight tubes, the difference in thermal expansion between the metal and polymer creates hoop stress that can cause radial cracking after thermal cycling from −20 °C to 60 °C. The design uses rounded internal corners, a minimum boss radius, and interference limits that account for the conditioned modulus of the polymer. Published data for this specific configuration is limited, so end-use validation includes thermal cycling and leak testing under pressure after the moulded article has reached equilibrium moisture content.
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EMS-Grivory Grilamid TR 55 LX Nylon 12, Conditioned is an amorphous transparent polyamide moulding compound supplied by EMS-GRIVORY. The term “Conditioned” refers to a controlled moisture state equilibrated under ISO 291 at 23 °C and 50 % RH, not to a post-moulding surface treatment. In this state, the polymer contains absorbed water that shifts short-term mechanical response relative to dry-as-moulded specimens: tensile modulus and yield stress decrease, while notched impact and elongation increase. Thermal analysis under ISO 11357-2 does not identify a sharp crystalline melting peak; the glass transition temperature is reported near 155 °C. Light transmission measured on 2 mm plaques is typically 92 % per ISO 13468-1. Density is listed as 1.06 g/cm³ under ISO 1183-1. Conditioned moisture content is approximately 1.5 % by ISO 62 at 23 °C and 50 % RH. The grade is used where optical clarity, dimensional stability under humidity cycling, and chemical resistance to oils, greases, and many aliphatic hydrocarbons must be maintained without the stress-cracking sensitivity of polycarbonate tested by ISO 22088-3 or the higher equilibrium moisture uptake of PA6 under ISO 62.
In transparent amorphous polyamide mouldings, wall thickness is governed by spiral-flow length, gate position, and optical haze development rather than by crystallisation-induced opacity. For Grilamid TR 55 LX, supplier moulding guidelines typically target wall sections between 1.0 mm and 3.0 mm for optical components. Sections above 4.0 mm become more sensitive to sink marks, voids, and visible flow lines because the molten mass cools slowly and the amorphous structure densifies under pack pressure. Optical haze increases with thickness; a 2 mm moulded plaque is used as the standard reference for internal transmission measurements. The glass transition near 155 °C permits short-term service above 100 °C in non-load-bearing optical housings, but load-bearing parts should be evaluated under ISO 75-1/2 deflection temperature instead of relying on Tg alone. Injection moulders running GRILAMID transparent polyamide grades report that thin-wall filling below 0.8 mm requires high injection velocity and gate diameters no smaller than 0.8 mm; published data for this specific configuration is limited below this thickness. In multi-cavity hot-runner tools, the amorphous character gives low mould shrinkage, typically 0.4–0.6 % in flow direction and 0.5–0.7 % transverse, reducing warpage relative to semicrystalline nylon 12 but increasing the need for uniform cooling-circuit layout.
Flowmeter bodies, filter housings, pump sight glasses, and optical sensor windows represent recurring production components for Grilamid TR 55 LX Nylon 12, Conditioned. In these components, the material’s moisture-conditioned impact behaviour and transparency permit continued function after exposure to humid air, cutting oils, and fuel vapours. Environmental stress-cracking resistance is commonly assessed by ISO 22088-3 or ISO 22088-6 under specified chemical media; the amorphous polyamide structure usually shows higher resistance to aliphatic and aromatic hydrocarbons than polycarbonate under similar strain. For medical or pharmaceutical fluid-handling applications, the moulder must establish biocompatibility on the finished device under ISO 10993-1 using extraction conditions that reflect actual contact time and surface-to-volume ratio. Published supplier data for USP Class VI and ISO 10993-5 cytotoxicity can support material screening, but device-level regulatory clearance requires testing on the final moulded component. The use of conditioned test specimens for mechanical property datasheets is relevant because many devices are assembled and tested in ambient indoor conditions, not in dry-as-moulded states.
Sterilization compatibility in transparent polyamide fluid-handling devices is not a single-point property but a function of dose, dose rate, oxygen ingress, and part wall thickness. For Grilamid TR 55 LX Nylon 12, Conditioned, gamma irradiation at typical medical device doses in the range 25–50 kGy is evaluated for yellowing and tensile embrittlement on the actual moulded part; material screening alone is insufficient because stabiliser package, dose rate, and part geometry control oxidative degradation. Validation under ISO 11137-1 and ISO 11137-2 requires bioburden-based dose substantiation; material compatibility is addressed by measuring tensile impact or notched impact after irradiation. EtO sterilisation is widely used with polyamides because the process temperature remains below the deflection temperature; residual ethylene oxide must be controlled under ISO 10993-7 by aeration cycles at 50–60 °C for durations determined by wall thickness and packaging. Steam sterilisation at 134 °C approaches the material’s 155 °C glass transition and can exceed the published HDT/A of 120 °C under ISO 75-1/2, so load-bearing components exposed to repeated autoclave cycles require post-sterilisation dimensional and burst-pressure checks.
Pre-drying in a desiccant dryer with a dew point of −30 °C or lower is specified before melt processing. EMS-GRIVORY processing literature for transparent polyamide grades recommends drying at 80 °C for 4–6 h from sealed packaging to reach a residual moisture content below 0.10 % by Karl Fischer titration. At RH > 60 %, open material hoppers should be protected with dry-air blankets because regranulate stored for more than 30 min can exceed the moisture limit and produce surface streaks, voids, and hydrolysis-induced molecular-weight loss. Melt temperature in the barrel is controlled between 250 °C and 270 °C; nozzle and hot-runner setpoints above 280 °C should be avoided for long residence times because chain scission shifts the molar mass distribution and lowers notched impact. A three-zone screw with L/D ratio between 20:1 and 25:1 and a low-compression profile of 2.0:1 to 2.5:1 is typical for this amorphous polyamide. Mould temperatures in the range 60–100 °C are used; lower mould temperatures reduce cycle time but increase residual stress in transparent parts, while higher temperatures improve replication of polished mould surfaces. Injection speed is set high enough to avoid premature solidification in thin optical sections, but excessive shear above 1000 s⁻¹ can generate melt fronts that appear as silver streaks in clear parts. On production lines using hot-runner systems with valve gates, the shot-to-barrel volume ratio should stay above 50 % and below 80 % to limit melt residence time; moulders running short shots report visible yellowing after 8–10 min at 270 °C in externally heated manifolds. Hold pressure is adjusted between 50 MPa and 80 MPa hydraulic pressure until gate freeze is confirmed by part weight stabilisation. Dimensional checks after conditioning under ISO 291 are required because the amorphous structure absorbs moisture slowly and post-moulding shrinkage can add 0.05–0.15 % change relative to dry-as-moulded measurement.
Relative to semicrystalline nylon 12 grades, Grilamid TR 55 LX Nylon 12, Conditioned does not rely on spherulitic crystallinity for mechanical strength. Semicrystalline PA12 typically shows a melting peak near 175–180 °C and opaque or translucent appearance depending on crystallite size, whereas the amorphous TR 55 LX maintains transparency through the wall section after cooling. Moisture uptake at 23 °C and 50 % RH is measured under ISO 62 and is generally lower than PA6. The conditioned state therefore gives a smaller modulus shift than would be observed in PA6 or PA66, an advantage in dimensionally stabilised clear components. Relative to transparent polycarbonate, the polyamide has higher resistance to many hydrocarbons, but inferior resistance to highly polar solvents, strong acids, and hot water above 60 °C. Relative to PMMA, the material offers lower modulus but higher elongation at break and notched impact, making it more suitable for snap-fit assemblies that must survive assembly-line drops. The LX designation is a supplier-specific stabilised formulation; when replacing an unmodified transparent polyamide, the processor should re-qualify colour after multiple processing passes and sterilisation cycles because differences in lubricant and light-stabiliser package can change injection pressure and yellowing under ISO 4892-2 accelerated weathering.
Table 1 compiles representative values from published EMS-GRIVORY technical data for Grilamid TR 55 LX Nylon 12, Conditioned. The values are typical screening data, not guaranteed lot-release limits. Where a range is shown, the moulder should request the current batch certificate for the specific lot.
| Property | Test standard | Dry as moulded | Conditioned |
|---|---|---|---|
| Density | ISO 1183-1 | 1.06 g/cm³ | 1.06 g/cm³ |
| Tensile modulus | ISO 527-1/2 | 2200 MPa | 1800 MPa |
| Yield stress | ISO 527-1/2 | 75 MPa | 65 MPa |
| Elongation at break | ISO 527-1/2 | >50 % | >50 % |
| Charpy notched impact at 23 °C | ISO 179/1eA | 8 kJ/m² | 10 kJ/m² |
| Glass transition temperature | ISO 11357-2 | 155 °C | 155 °C |
| Light transmission at 2 mm | ISO 13468-1 | 92 % | 92 % |
Optical sensor windows moulded from Grilamid TR 55 LX Nylon 12, Conditioned require low internal haze. Haze is measured by ISO 14782 or ASTM D1003; typical 2 mm moulded plaques used for supplier data report haze below 2 % when polished mould surfaces and the specified melt temperature are maintained. In hot-water washdown environments, the combination of moisture, temperature, and chlorine-bearing disinfectants can initiate microcrazing; parts should be evaluated by ISO 175 immersion at the actual disinfectant concentration and temperature. Automotive interior optical sensors may also require fogging and VOC testing by ISO 6452 or VDA 278 depending on OEM specification. For drinking-water contact components, the moulder must verify extraction at the intended surface-to-volume ratio according to EU 10/2011 or NSF/ANSI 61, because resin compliance alone does not cover regrind layers and mould-release residues.
In chemical service, transparent polyamide mouldings are evaluated by ISO 175 immersion testing under anticipated fluid composition and temperature. Grilamid TR 55 LX Nylon 12, Conditioned is not recommended for continuous exposure to concentrated mineral acids, strong oxidisers, phenols, or high-temperature polar solvents above 50 °C without project-specific data. Chlorinated solvents can cause swelling and stress cracking, particularly when parts are moulded with high residual stress from undersized gates or cold mould surfaces. For outdoor optical covers, ultraviolet stabilisation should be confirmed by accelerated weathering under ISO 4892-2 with a xenon-arc source and measured colour change by ISO 7724-2; the LX formulation may contain light-stabiliser packages, but that does not eliminate yellowing in unpigmented parts after extended UV exposure. Welding and bonding processes require surface preparation because the chemical resistance reduces the effectiveness of solvent-borne adhesives; plasma or corona pre-treatment followed by epoxy or polyurethane adhesives is typical. Snap-fit and threaded closures in transparent parts should be tested after conditioning because moisture reduces modulus and can alter the effective interference fit by a few tenths of a per cent, enough to affect sealing force in small-diameter fluid connectors.
Where initial material screening is required before device-level validation, the checklist in Table 2 identifies standards commonly referenced for transparent polyamide fluid-contact components. Compliance is not transferable from resin certification to finished device; extraction ratio, process history, and secondary operations change the assessment.
| Assessment | Standard or regulation | Specimen condition or comment |
|---|---|---|
| Cytotoxicity | ISO 10993-5 | Extract prepared per ISO 10993-12 on final device |
| Irritation and delayed-type hypersensitivity | ISO 10993-10 | Final device or representative subassembly |
| USP Class VI | USP <88> | Supplier certification from moulding resin |
| Accelerated weathering | ISO 4892-2 | 1000 h xenon-arc, black-panel temperature 65 °C, daylight filter |
| Flammability | UL 94 | 1.6 mm specimen, category HB |
| Food-contact overall migration | EU 10/2011 | Simulant selected by intended food type and contact time |
Threaded closures and barbed connectors moulded from Grilamid TR 55 LX Nylon 12, Conditioned require torque-to-failure testing after conditioning because the moisture-induced modulus reduction alters interference fit. On injection moulding lines, clamp force is calculated from projected area; transparent thin-walled parts are typically moulded at a minimum of 3–5 kN/cm² of projected area to prevent flash and achieve adequate packing. Hot-runner valve gates are controlled independently at 265 °C with tip temperature monitoring. Ejection at a part surface temperature below 80 °C is preferred to avoid post-mould distortion of polished optical surfaces.
