| HS Code | 133224 |
| Density | 1.03 g/cm³ |
| Melting Point | 185 °C |
| Water Absorption 24h | 1.2 % |
| Tensile Strength | 35 MPa |
| Elongation At Break | 350 % |
| Flexural Modulus | 400 MPa |
| Charpy Impact Strength 23c | No break |
| Shore D Hardness | 72 |
| Abrasion Resistance Taber Cs17 | 6 mg/1000 cycles |
| Dielectric Strength | 30 kV/mm |
| Volume Resistivity | 1e13 ohm·cm |
| Coefficient Of Thermal Expansion | 9e-5 /K |
As an accredited Arkema Rilsan BMNO TLD PA11 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg sealed multi-layer bags, protected against moisture for safe handling and storage. |
| Container Loading (20′ FCL) | Load Arkema Rilsan BMNO TLD PA11 into 20′ FCL on dry, clean pallets; secure tightly, protect from moisture and heat. |
| Shipping | Ship Arkema Rilsan BMNO TLD PA11 in sealed, moisture-proof containers to prevent humidity absorption. Keep dry, cool, and away from direct sunlight. Classified as non-hazardous under normal shipping conditions, but avoid dust accumulation and ignition sources. Use standard freight with secure packaging to prevent spillage during transit. |
| Storage | Store Arkema Rilsan BMNO TLD PA11 powder in its original, tightly sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Protect from moisture and humidity to prevent degradation; avoid dust accumulation. Maintain temperatures below 30°C and use within the recommended shelf life for optimal performance. |
| Shelf Life | Shelf life is typically 2 years from manufacture when stored unopened in original, dry, cool conditions. |
Pre-drying of Arkema Rilsan BMNO TLD PA11 pellets at 80 °C for 4–6 h to a residual moisture content at or below 0.08% by weight is the controlling step before melt processing of heavy-truck coiled air brake tubing. In production, desiccant dryers are operated with a dew point of -40 °C and a bed temperature not exceeding 85 °C to avoid pellet surface oxidation. Residual moisture above 0.15% hydrolyzes the amide backbone during residence at 230 °C or higher, reducing melt viscosity and producing die-flow instabilities that appear as micro-porosity and orange-peel surface roughness on the finished tube. The measured loss in relative viscosity after a single pass through a 45 mm single-screw extruder can exceed 15% when wet resin is processed, and the resulting tube lot often fails SAE J844 burst-pressure scatter criteria because wall-thickness minima coincide with hydrolysis-induced bubble formation.
Extrusion is conducted on a barrier screw with an L/D ratio of 24:1, a compression ratio of 2.2:1, and a Maddock mixing section located in the metering zone. Typical start-up setpoints for a 45 mm barrel are feed 210 °C, compression 235 °C, metering 245 °C, flange 240 °C, and die 235 °C. Melt temperature measured at the die exit is kept between 235 °C and 245 °C. Vacuum sizing follows the die through a calibrator with an internal surface finish of 0.2 μm Ra, water at 18–22 °C, and a negative pressure of 0.2–0.4 bar. Draw ratio is limited to 1.05:1 to maintain circularity within 0.10 mm TIR on a 6.35 mm OD × 4.32 mm ID air brake tubing profile. The tube is coiled after conditioning at 23 °C and 50% relative humidity for 24 h; immediate coiling from water quench can produce ovality excursions above 0.12 mm TIR.
| Stage | Parameter | Setting |
|---|---|---|
| Drying | Desiccant dryer temperature | 80 °C |
| Drying | Residual moisture target | ≤0.08% |
| Extruder zone 1 | Feed setpoint | 210 °C |
| Extruder zone 2 | Compression setpoint | 235 °C |
| Extruder zone 3 | Metering setpoint | 245 °C |
| Die | Melt exit temperature | 235–245 °C |
| Vacuum sizing | Sizing tank pressure | -0.2 to -0.4 bar |
| Finishing | Post-extrusion conditioning | 24 h at 23 °C, 50% RH |
Finished tube testing follows SAE J844 and ISO 7628-1:2021. Cold impact at -40 °C requires no cracking after a 1.0 kg falling-weight impact on a conditioned coil; the PA11 grade retains ductile behaviour at this temperature where short-chain aliphatic polyamides can embrittle. Zinc chloride stress-crack resistance is commonly qualified by immersion in 50% aqueous zinc chloride solution at 50 °C for 200 h, followed by a mandrel bend of 180° over a radius equal to 3×OD. BMNO TLD is selected over PA12 on heavy-truck platforms where this qualification test is embedded in frame rail and trailer air system specifications. Dimensional acceptance after thermal conditioning at 100 °C for 24 h is verified by length change below 2% and OD change below 0.05 mm.
In diesel fuel return and under-hood vapour management circuits, the controlling material properties are aliphatic hydrocarbon resistance, flexural fatigue resistance, and fitting retention after heat ageing. BMNO TLD is extruded as a mono-wall diesel return line in continuous lengths for commercial vehicle engine bays. The line is exposed to diesel at temperature peaks of 120 °C, mixed with condensed water and occasional urea mist from selective catalytic reduction systems. Aliphatic diesel swell is below 2% at 60 °C, and the tubing remains dimensionally stable under ISO 13775-1:2015 heat ageing at 125 °C for 1000 h. Burst-pressure retention after ageing is at least 85% of the unaged value when tested at 23 °C, and fitting pull-off force at 125 °C remains above 150 N on an 8 mm OD line with a ribbed quick-connector interface.
For gasoline carbon canister vapour lines, BMNO TLD is not selected as a mono-wall solution because the evaporative emission limits of CARB LEV III require hydrocarbon permeation below levels attainable with unalloyed PA11 under SAE J2260. A co-extruded structure with EVOH as the centre barrier and BMNO TLD as the outer protective layer is possible only when the EVOH layer is continuous and the tie layers are selected for zinc chloride resistance. Melt pumps are used on each extruder to hold interfacial residence time below 45 s at 230 °C, reducing the risk of EVOH gel formation and layer-thickness variance. When this structure is processed, the BMNO TLD outer jacket provides cut resistance and protects the EVOH barrier from incidental exposure to road salt and zinc chloride spray; without the outer PA11 layer, EVOH rapidly stress-cracks in chloride-laden underbody environments.
Automated warehousing and robotic cell pneumatic control lines use BMNO TLD extruded at 8 mm OD × 6 mm ID because the grade offers higher abrasion resistance and lower moisture regain than PA12 in humid washdown atmospheres. The tube is hot-air bent to a minimum radius of 3×OD at a surface temperature of 180–200 °C; heating time is 1.0–1.5 s per mm of wall thickness. After bending, the bend area is air-quenched to below 80 °C within 5 s to minimize crystallization-induced shrinkage. Push-to-connect fitting retention is governed by OD tolerance of ±0.10 mm and ovality below 0.15 mm. On-line ultrasonic wall-thickness scanning at 2 kHz detects neck-down excursions greater than 0.05 mm before the line is cut.
In cable-track chain suspension, the bent PA11 line is subjected to continuous flexure at frequencies up to 5 Hz over a minimum bend radius of 75 mm. The failure mode observed on production lines is not fatigue in the PA11 wall but rather fitting back-out caused by gradual ovalisation of the tube at the collet grip edge. A post-bend annealing step at 100 °C for 30 min in forced air reduces frozen-in stress and improves ovality retention after 1 million flex cycles. The absence of a plasticizer in BMNO TLD prevents plasticizer migration into nitrile seals in the push-in connector, which is a known cause of elastomer softening and intermittent pneumatic leakage.
In subsea unbonded flexible pipe internal pressure sheaths, BMNO TLD PA11 is considered only after grade-specific qualification because the pipe carcass and pressure armour generate localised shear on the polymer sheath during spooling and bending. Extrusion over a metallic interlocked carcass of 4 in to 12 in nominal ID uses a crosshead die with a melt temperature of 240 °C and a draw ratio below 1.00 to reduce frozen-in orientation. Sheath thickness is typically 3–5 mm, and the outer surface is sized with vacuum or pressure to a tolerance of ±0.2 mm. The sheath is quenched in water at 15–25 °C; rapid cooling freezes a lower crystallinity than slow air cooling, which improves ductility but reduces dimensional stability at elevated spooling temperatures.
Decompression qualification per API 17J Annex G uses methane gas saturation at 100 bar and 60 °C, followed by a decompression rate of 20 bar/min. Published accepted data for BMNO TLD at this specific condition are limited, and end users must confirm that the grade’s molecular weight distribution supports the required saturation time without blistering. The PA11 pressure sheath is not a substitute for a higher-viscosity grade when the carcass gap exceeds 15 mm or when the service fluid contains methanol concentrations above 10% at temperatures above 50 °C; under those conditions, slow crack growth resistance must be qualified using a separate grade-specific test campaign.
| Downstream segment | Normative reference | Critical test condition |
|---|---|---|
| Heavy-truck air brake tubing | SAE J844 / ISO 7628-1:2021 | Burst and cold impact at -40 °C |
| Diesel return line | ISO 13775-1:2015 | Heat ageing 125 °C, 1000 h |
| Pneumatic control line | ISO 14743 | Push-in connector retention after 1 million flex cycles |
| Subsea pressure sheath | API 17J, API 17B | Gas decompression at 100 bar, 60 °C |
| Hydraulic hose core | ISO 6803:2017 | Impulse at 120% working pressure, 100 °C |
Thermoplastic hydraulic hoses with a BMNO TLD PA11 inner core are produced on a crosshead extruder line where the core is extruded over a flexible mandrel, cooled, and then braided with aramid fibre. The inner core thickness ranges from 0.8 mm to 1.2 mm, and the core is sized to an ID of 6.4 mm before braiding. Selection of PA11 over PA12 is driven by mine-site failure investigations where galvanized hose couplings exposed to chloride-containing wash water caused stress cracking in PA12 cores. BMNO TLD resists this cracking and provides adequate hydraulic fluid compatibility with mineral oil and phosphate ester fluids at operating pressures up to 25 MPa. Surface roughness of the core must be below 0.8 μm Ra to ensure adhesion of the braid and outer polyurethane cover; rougher surfaces create trapped air pockets that delaminate during impulse loading.
Impulse testing per ISO 6803:2017 is conducted at 120% of rated working pressure and 100 °C oil temperature for 200,000 cycles. The failure mode of interest is not the PA11 core itself but the interface between core and braid under high-frequency pressure spikes. BMNO TLD must be free from processing aids that migrate to the braid interface and reduce adhesion; melt temperature is therefore limited to 245 °C, and the hold-up time in the screw barrel is kept below 10 min. Continuous service temperature for the PA11 core in mineral oil is limited to 100 °C; above 120 °C, oxidative ageing of unmodified PA11 accelerates and the impulse life drops below the automotive platform threshold. This application is not recommended for phosphate ester fluids above 80 °C, and compatibility with water-glycol hydraulic fluids should be confirmed on a batch-specific basis because hydrolysis of the polymer backbone can proceed slowly at elevated pH.
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Arkema Rilsan BMNO TLD is a polyamide 11 (PA11) extrusion material supplied as moisture-protected pellets. The polymer backbone is synthesized from 11-aminoundecanoic acid derived from castor oil; ten methylene units separate the amide groups in the repeat unit, producing a long-chain aliphatic polyamide with lower amide-group density than PA6 or PA66. Under ISO 1183-1:2019, unfilled PA11 homopolymer typically records a density of 1.04 g/cm³ at 23 °C. Differential scanning calorimetry per ISO 11357-3:2018 at 10 °C/min identifies a melting peak near 189 °C for PA11; the BMNO TLD thermal trace may be broadened by the stabilizer and processing package, so the peak is used as an incoming material identity check rather than as the primary melt-temperature control setpoint. Water absorption at saturation under ISO 62:2008 is approximately 1.9 %, while PA6 and PA66 grades typically absorb 9–10 % under equivalent exposure. This moisture uptake difference makes PA11 suitable for thin-wall tubing and cable jacketing where humid conditioning must not produce large dimensional change. BMNO TLD is not a reinforced grade; it is positioned for flexible tube extrusion, with lower flexural modulus and higher elongation than general-purpose high-stiffness PA11 types.
The primary difference from PA6 and PA66 is chemical rather than additive-based. Conditioned at 23 °C and 50 % RH per ISO 1110:2019, PA11 absorbs about 1.1 % moisture by mass, whereas PA6 absorbs approximately 2.8 % under the same conditions. Moisture absorption depresses the glass transition of PA6 and can lower tensile modulus while increasing elongation; in PA11 the mechanical response is less sensitive to ambient humidity within the normal industrial range. For pneumatic tubing, this translates into more consistent fitting retention and burst pressure after environmental cycling.
Against PA12, the distinction is narrower. PA12 has a density near 1.01 g/cm³ and a melting peak near 178 °C under ISO 11357-3:2018, while PA11 melts near 189 °C. PA12 generally shows slightly lower saturated water uptake, but PA11 provides a different balance of melt strength, longitudinal dimensional stability, and permeation resistance in fuel-vapour and air-brake service. Neither material should be treated as a direct drop-in substitute without verifying wall thickness, fitting compatibility, and the relevant assembly specification. BMNO TLD is also not a glass-fiber-reinforced PA11. A 30 % glass-fiber-filled PA11 grade tested under ISO 527-1:2019 can exhibit tensile modulus above 6000 MPa, whereas a flexible unfilled PA11 grade typically falls below 1500 MPa. The flexible grade compensates with fracture strain values commonly above 200 % and with bending-fatigue behaviour that favours dynamic tubing and cable jacket service. The trade-off is lower tensile strength and higher creep under sustained internal pressure; BMNO TLD is therefore specified where flexibility and repeated motion control the design, not where maximum static burst strength or minimum creep is the dominant requirement.
Notched Charpy impact strength of unfilled PA11 measured under ISO 179-1/1eA:2023 at 23 °C is generally reported above 20 kJ/m²; low-temperature values remain grade-specific. Where a specification requires Charpy data at −40 °C, the exact BMNO TLD value should be requested from Arkema rather than inferred from other PA11 grades.
As-received pellet dryness is not sufficient for stable tubing extrusion. For BMNO TLD, the moisture target should be set at or below 0.08 % by mass determined by ISO 15512:2019. A desiccant-bed dryer with a dew point no higher than −40 °C, an air temperature of 80–90 °C, and a residence time of 4–6 h is standard for sealed material that has been stored at ambient conditions. If bags have been opened in relative humidity above 60 % RH for more than 30–60 min, a dry-air hopper blanket or additional drying should be used. Moisture above 0.08 % accelerates hydrolysis of the amide group during melt residence; the resulting molecular-weight loss appears on the line as low melt strength, difficulty maintaining tube geometry, increased die-lip deposit, and a gradual loss of burst pressure in the finished part.
Production-scale single-screw extruders with length-to-diameter ratio between 24:1 and 30:1 and compression ratio between 2.5:1 and 3.5:1 are widely used for PA11 tubing. Barrier screws with a mixing section improve homogenization and reduce melt-temperature spread. The barrel profile typically starts at 220 °C in the feed zone, rises to 240–250 °C in the compression zone, and reaches 250–260 °C at the die adapter. Melt temperature should be measured in the melt stream after the screw tip; sustained values above 270 °C are associated with gel formation, yellowing, and stabilizer depletion. Residence time above 10–15 min at melt temperature should be avoided by reducing barrel inventory or increasing throughput.
Rheologically, unfilled PA11 at 250 °C and shear rates between 100 s⁻¹ and 1000 s⁻¹ exhibits apparent viscosity in the approximate range of 100–1000 Pa·s, depending on molecular weight and moisture. This shear-thinning response permits thin-wall tube draw-down but also means that small temperature differences across the die land can produce measurable wall-thickness variation. On a spiral mandrel die, melt-temperature variation across the die circumference should be kept within ±5 °C; wider variation typically appears as one-sided wall thinning or eccentricity that fitting tools cannot correct later. Die-head pressure variation in production should remain within ±2 % of the target value; periodic oscillation at intervals corresponding to screw revolution frequently indicates feed bridging or moisture non-uniformity.
At melt temperatures above 270 °C, thermo-oxidative chain scission in PA11 accelerates. The degradation is not linear; increasing melt temperature from 260 °C to 280 °C may shorten the stable processing window from tens of minutes to only a few minutes. The first observable signatures are yellowing of the melt, specks or fisheyes in the tube wall, and deposits on the die exit that require raised die temperature or manual clearing. A melt pump after the screw does not correct the viscosity loss caused by hydrolysis; it only masks short-term pressure variation. When die-head pressure falls by more than 5 % at constant screw speed, hydrolytic or thermal degradation should be suspected, and the moisture content of the feed should be checked immediately.
Cooling water temperature in the sizing sleeve is normally maintained between 20 °C and 60 °C. Lower quench temperatures reduce crystallinity and improve flexibility but increase post-extrusion shrinkage; higher quench temperatures raise crystallinity and dimensional stability but can reduce low-temperature impact. The balance is set by wall thickness and the required post-conditioning dimensions. Published data for online annealing of BMNO TLD is limited; if residual stress is critical, an annealing study with conditioning under ISO 1110:2019 followed by dimensional measurement is required.
Chemical exposure limits must be treated separately from short-term processing performance. Rilsan BMNO TLD is not specified for continuous hot-air service above 120 °C unless the exact heat-stabilized formulation is validated by ISO 188:2023 or ASTM D3045-18 at the intended continuous-use temperature. At 150 °C, unstabilized PA11 can lose elongation rapidly and develop brittleness within 100–500 h depending on stabilizer package, wall thickness, and airflow. This value is a screening guideline, not a service rating for BMNO TLD without Arkema data.
Zinc chloride is a documented environmental stress-cracking agent for polyamides. A stressed PA11 tube exposed to concentrated zinc chloride at 50 °C may crack before the same part immersed in neutral water. Road de-icing salts containing calcium chloride and magnesium chloride present a similar risk; fitting areas where stress concentrates at the barb or insert are the most likely crack initiation sites. Resistance to common mineral oils, greases, aliphatic hydrocarbons, and diluted alkalis is generally good, but strong acids, phenolic compounds, and high-pressure steam should be avoided. For automotive air brake tubing, the material is typically evaluated under SAE J844 or DIN 73378, where alcohol/water brake-fluid conditioning, humidity ageing, and low-temperature impact form part of the qualification. BMNO TLD should not be considered automatically compliant with a vehicle-level performance specification without tube and fitting assembly testing.
For applications involving food contact, cosmetic contact, or potable water, the current Arkema compliance statement should be obtained. Unfilled PA11 may be formulated to comply with the compositional requirements of FDA 21 CFR 177.1500 and EU Regulation 10/2011, but migration testing under the actual food simulant is required before commercial use. Electrical and electronic applications normally require documentation of conformity to Directive 2011/65/EU (RoHS) as amended and Regulation (EC) No 1907/2006 (REACH). The bio-based carbon content of castor-derived PA11 can be measured by ASTM D6866-24; renewable carbon values above 90 % are common for this chemistry.
Application trials on production-scale tubing lines show that die swell and wall-thickness uniformity are sensitive to melt temperature and moisture. A wall-thickness variation of ±0.05 mm on a 6 mm outer-diameter tube is achievable only when the melt temperature is held within a narrow band across the die circumference. In air brake tubing evaluated under SAE J844 and DIN 73378, PA11 grades are chosen for cold-impact resistance, chemical resistance to alcohol/water mixtures, and resistance to brittle fracture after heat ageing. BMNO TLD-specific burst-pressure data at 23 °C and −40 °C should be obtained before substitution into high-pressure hydraulic service; published data for this exact configuration are limited.
