| HS Code | 549090 |
| Density | 0.960 g/cm³ |
| Melt Flow Rate | 0.30 g/10 min (190°C/2.16 kg) |
| Tensile Strength At Yield | 24 MPa |
| Tensile Elongation At Break | 600% |
| Flexural Modulus | 1.10 GPa |
| Notched Izod Impact Strength | 80 J/m |
| Shore D Hardness | 66 |
| Vicat Softening Temperature | 125°C |
| Deflection Temperature At 0 45 Mpa | 70°C |
| Melt Temperature | 190–230°C |
| Mold Temperature | 20–40°C |
| Linear Mold Shrinkage | 0.015–0.025 cm/cm |
As an accredited Birch Plastics HDPE PIR-HD69BK factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Birch Plastics HDPE PIR-HD69BK black recycled pellets are supplied in 25 kg bags, forty per 1,000 kg pallet. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): Birch Plastics HDPE PIR-HD69BK, palletized bags or bulk, securely loaded and braced for safe ocean shipment. |
| Shipping | Birch Plastics HDPE PIR-HD69BK ships as non-hazardous, solid thermoplastic pellets in sealed bags, boxes, or bulk sacks, palletized and stretch-wrapped. Standard freight applies; no UN number or DOT hazard class required. Store and transport cool, dry, and away from ignition sources. Follow local rules and the supplier’s SDS. |
| Storage | Store Birch Plastics HDPE PIR-HD69BK in a cool, dry, well-ventilated warehouse, using sealed original bags or containers on pallets. Protect from direct sunlight, heat, flames, moisture, dust, and strong oxidizers. Keep away from ignition sources. Avoid physical damage and stack securely. Maintain clean indoor conditions, prevent pellet release to drains or environment, and follow local regulations and manufacturer guidance. |
| Shelf Life | Recommended shelf life is 24 months from date of manufacture when stored in original unopened packaging under cool, dry conditions. |
When Birch Plastics HDPE PIR-HD69BK is introduced into non-pressure corrugated drainage pipe and non-pressure rigid conduit, the first qualification barrier is slow crack growth retention under wet-soil service, not melt flow alone. For gravity-flow storm sewer and subsurface drainage products specified under ASTM F2306 and AASHTO M294, extrusion plants typically blend the PIR at 20 wt% to 40 wt% into a virgin HDPE grade that carries the required ASTM D3350 cell classification. The upper PIR share is set by creep-rupture behavior and notched slow crack growth; a recycled stream that has not been qualified by ASTM F1473 PENT or an equivalent notched constant tensile load test should not be pushed beyond the lower part of that range. On a grooved-feed single-screw extruder with 30:1 L/D and a screen pack of 60/80/120 mesh, fused cap fragments and label residues are removed without excessive melt pressure oscillation. Melt temperature is held between 180 °C and 225 °C; a die-head setting above 240 °C accelerates oxidative chain scission and creates carbonized specks in the corrugated wall. Moisture is normally not a bulk issue for HDPE, but if silo relative humidity exceeds 60%, surface condensation on pellets from outdoor storage can cause splay at the die; a hopper-air dryer set at 65 °C for 2 h is sufficient. The recycled fraction must not be assumed to qualify for pressure-rated PE 4710 or PE 100 pipe classes; that requires separate hydrostatic design basis testing and full traceability of the PIR stream. Lot acceptance should include density by ISO 1183-1:2019, melt flow by ISO 1133-1:2022 at 190 °C and 21.6 kg, and oxidation induction time by ISO 11357-6. If OIT drops below the value accepted for the virgin control blend, antioxidant top-up must be evaluated before the lot is committed to a corrugator.
The limiting parameter for PIR-HD69BK in blown film is defect density, not the melt index of the blend. A three-layer geomembrane support or silage cover line can run the recycled HDPE in the core layer at 15 wt% to 25 wt% of total film weight, while the skins use virgin LLDPE or UV-stabilised virgin HDPE. Machine-direction tear strength under ASTM D1922 declines before dart impact under ASTM D1709 because hard particulates in the post-industrial stream become crack-initiation sites at the edge of a tear test specimen. Core-layer melt filtration should be no coarser than 100 mesh (150 µm); a die gap between 1.5 mm and 2.2 mm helps control head pressure while preventing unmelts from passing into the bubble. Film tensile yield is measured under ASTM D882 at 23 °C; if the product is sold into the EU construction sector, the converter will further require REACH SVHC screening and a RoHS 2011/65/EU Annex II audit of the recycled feed. For agricultural silage covers, UV stabilizer addition is mandatory because black film surface temperatures can exceed 60 °C in outdoor storage, and carbon black alone does not prevent oxidative embrittlement at the exposed skin. The recycled layer should remain hidden in the core; placing PIR-HD69BK in the outer layer increases surface roughness that accelerates wear during deployment and creates printing defects if the film is marked. If the PIR lot shows a large drop in oxidation induction time by ISO 11357-6 relative to the virgin reference, the film should be limited to short-life construction film or the antioxidant masterbatch let-down should be adjusted according to the additive supplier’s recommendation. Blown film lines that process PIR at the high end of the range should use an online surface-contamination detector or an agreed gel-count sampling plan because manual gel inspection is too operator-dependent for release testing.
For black distribution crates, pallet feet, and dunnage trays produced on 800–1,200 t hydraulic injection moulding machines, a practical starting formulation is 50 wt% PIR-HD69BK with 50 wt% virgin HDPE whose melt-flow rate lies within 0.2 g/10 min of the recycled lot under ISO 1133-1:2022 at 190 °C, 2.16 kg. Higher PIR fractions are feasible in thick-walled distribution crates when the service temperature remains above 0 °C and the part geometry avoids sharp notches. Notched Izod impact is evaluated under ISO 180/A at 23 °C and −20 °C; low-temperature impact is normally the first property to fail as PIR increases because rigid contaminants and mixed-polymer particles act as stress concentrators. Converters running PIR in pallet tools observe gate blush around hot runner tips when the recycled lot has a flow variation greater than 0.3 g/10 min from the baseline; this is a batch-to-batch variance signal that should trigger a short-shot study before full production. Melt temperature is maintained in the 210–250 °C band; higher temperatures can reduce fill pressure but increase odour and surface streaking. Cooling water at 15–20 °C and staged packing pressure reduce warpage in long pallet ribs, but cycle time should not be shortened below the point where the part is dimensionally stable at ejection. Material traceability is supported by ISO 15270 and ASTM D4976; EU converters typically request REACH SVHC screening and RoHS 2011/65/EU Annex II compliance for the recycled feed. If the PIR stream carries oil, solvent, or alkali residues, the moulded product is not suitable for food-contact packaging, cosmetic trays, or toys.
A multi-layer sheet line can bury PIR-HD69BK between virgin HDPE cap layers at 30 wt% to 60 wt% of total sheet mass for industrial dunnage trays, tote dividers, and reusable box liners. The cap layers maintain surface gloss and hide regrind-related pigment specks, while the core supplies stiffness. Core-layer extrusion on a vacuum-vented twin-screw line with 36:1 L/D removes residual moisture and volatile residues that would form pinholes during downstream thermoforming. Flat-die melt pressure should be held within 3% of set point across the width, and roll-stack temperatures between 60 °C and 80 °C are used to build sheet stiffness without embossing defects. Tensile yield is measured under ISO 527-2/1B at 23 °C, flexural modulus under ISO 178, and creep in structural dunnage under ISO 899-2. Thermoformed parts should be checked for pinholes at corner draw ratios above 3:1; walls below 0.8 mm can expose agglomerated particles from the recycled core. The black PIR core is acceptable only for non-food and non-pharmaceutical dunnage. For outdoor service, UV stabilizers are required because carbon black does not fully prevent surface embrittlement after prolonged UV exposure. If the sheet is formed into heavy-duty trays for automated warehouses, loaded creep tests should be performed on the actual tray geometry rather than relying on the virgin material datasheet.
| Conversion route | Relevant standard or method | Typical PIR control band | Observed rejection mode |
|---|---|---|---|
| Corrugated drainage pipe | ASTM F2306, AASHTO M294, ASTM F1473 | 20–40 wt%; melt 180–225 °C | Carbonised specks; slow crack growth loss |
| Blown film core layer | ASTM D882, ASTM D1922, ASTM D1709 | 15–25 wt%; filtration 150 µm | MD tear loss; gel tear from unmelts |
| Injection-moulded pallets | ISO 180/A, ISO 15270, ASTM D4976 | 50 wt%; melt 210–250 °C | Low-temperature notch sensitivity |
| Thermoformed sheet core | ISO 527-2/1B, ISO 178 | 30–60 wt%; roll stack 60–80 °C | Draw-ratio pinholes |
| Rotational moulding powder | ISO 6603-2 | 15–25 wt%; oven internal 190–220 °C | Pinholes from incomplete sintering |
In extrusion blow moulding of non-food industrial bottles and containers, parison sag limits the usable PIR content more than tensile strength. A starting concentration of 25 wt% PIR-HD69BK is suitable for containers up to 5 L produced on shuttle blow moulders with clamp forces of 200–300 kN. For larger drums above 20 L, the PIR fraction is usually kept at 15 wt% or lower because the heavier parison elongates before mould closing and causes wall-thickness variation. Die-head temperature should not exceed 220 °C; above 230 °C the viscosity reduction is sufficient to widen the programmed die gap on the parison controller and increase flash. Drop impact testing follows ASTM D2463 or ISO 11173; failure at the pinch-off weld is more likely than a top-load crack. Dangerous goods packaging that carries an existing UN certification is not automatically accepted with PIR content; the finished package must be retested under the applicable UN Model Regulations. Non-food detergent, automotive fluid, and industrial agricultural chemical bottles are typical outlets when the PIR lot is screened for odor and taint by extraction under EU 10/2011 migration conditions as a conservative quality check. The pellets should be dry and free of surface condensation; if storage relative humidity exceeds 60%, hopper drying at 65 °C for 2 h prevents elongated air bubbles in the parison wall. This application boundary excludes containers for oxidizing chemicals and long-term fuel storage unless the recycled fraction is fully traceable and stress-crack resistance is verified on the final container.
Rotational moulding with PIR-HD69BK requires the pellet to be pulverised to a powder passing 35 mesh (500 µm) before charging; whole pellets can produce localized over-sintering and pinholes. Blending ratios from 15 wt% to 25 wt% with virgin rotomoulding HDPE are a conservative starting range for black agricultural tanks and buoyancy floats. A ribbon blender or high-speed mixer should homogenise the powder; the post-industrial fraction may contain trace dust and label fragments that cling to electrostatic mould surfaces and must be removed before charging. Peak internal air temperature should be held between 190 °C and 220 °C; temperatures above 220 °C increase oxidative embrittlement of the recycled fraction. Instrumented puncture under ISO 6603-2 at −20 °C is the most sensitive release test for outdoor tanks. Published data for this specific configuration is limited, so tank producers must validate wall-thickness distribution and weathering on their own mould geometry before accepting repeated lots.
In dark wood-plastic composite profiles, PIR-HD69BK can serve as the matrix polymer where post-industrial HDPE offers lower processing temperature than polypropylene and adequate melt encapsulation of dried wood or natural fibre. A typical extrusion formulation contains 40–60 wt% recycled HDPE, 30–50 wt% dried wood flour below 150 µm, and 2–4 wt% maleic anhydride-grafted polyethylene coupling agent. Full-scale compounding is performed on a counter-rotating twin-screw extruder with 28:1 to 36:1 L/D; torque limits rather than barrel temperatures govern throughput because variable fractional melt material in the PIR stream can create torque spikes that shear the coupling agent from the fibre surface. Melt temperature near the die should remain below 190 °C to avoid wood flour darkening and processing odors. Mechanical testing follows ASTM D7031 or customer-specific bending and creep protocols; water absorption is screened by ASTM D570. The black pigmentation in PIR-HD69BK reduces the amount of carbon black masterbatch required for black and brown decking or fence profiles. This application is not suitable for light-coloured WPC surfaces or for profiles that require food-contact or drinking-water compliance.
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Birch Plastics HDPE PIR-HD69BK is a black post-industrial recycled high-density polyethylene grade supplied for non-food and non-pharmaceutical polymer conversion. The alphanumeric designation identifies a high-density polyethylene substrate, a black color package, and an internal grade code; it is not a substitute for a certificate of analysis. Because the feedstock is recovered from manufacturing scrap rather than municipal waste, the contamination profile is generally narrower, but it is not absent. Incoming quality control should require a lot-specific certificate reporting melt flow rate, density, ash content, moisture content, and tensile screening values. Published independent data for this specific grade configuration is limited, so all processing and application decisions should be anchored to measurements obtained under ISO 1133-1:2022, ASTM D792-20, and ASTM D5630-13.
Recycled HDPE grades with fractional-melt flow are particularly sensitive to molecular weight distribution drift because high-molecular-weight fractions control melt elasticity while low-molecular-weight fractions control melt flow. Melt flow rate should be measured at 190 °C with a 2.16 kg load following ISO 1133-1:2022 or ASTM D1238-20. For a black recycled HDPE, the melt index may appear lower than a comparable virgin HDPE if carbon black or inorganic residues increase melt viscosity. A single melt flow point does not describe shear response; capillary rheometry across 100 s-1 to 1000 s-1 is recommended when the material is intended for high-shear processes such as profile extrusion or thin-wall injection molding.
Density should be measured on compression-molded plaques conditioned at 23 °C per ASTM D792-20 or ISO 1183-1:2019. High-density polyethylene typically falls between 0.941 g/cm³ and 0.965 g/cm³; a grade-specific tolerance must be obtained from the supplier because recycled feedstocks may contain less than 2 wt% polypropylene or ethylene-vinyl acetate contamination that alters density and crystallization behavior. Ash content per ASTM D5630-13 should be interpreted as a contamination indicator: values above 0.5% by mass may signal pigment agglomerates, filler residues, or tramp inorganic contamination. Carbon black content per ASTM D1603-14 should be reviewed when ultraviolet stabilization or lot-to-lot color consistency is required.
| Verification domain | Test method | Condition or equipment | Purpose in recycled HDPE acceptance |
|---|---|---|---|
| Melt flow rate | ISO 1133-1:2022 / ASTM D1238-20 | Melt indexer at 190 °C, 2.16 kg | Detects chain scission and low-viscosity drift |
| Density | ASTM D792-20 / ISO 1183-1:2019 | Conditioned plaque at 23 °C | Confirms high-density classification and contamination dilution |
| Ash content | ASTM D5630-13 | Controlled muffle furnace per method | Estimates inorganic residues from pigments, fillers, or tramp material |
| Carbon black content | ASTM D1603-14 | Tube furnace method | Verifies black concentrate loading and dispersion |
| Moisture | ASTM D6980-17 | Loss-on-drying | Prevents surface splay and internal voids during conversion |
| Tensile yield and elongation | ASTM D638-14 Type IV | Testing speed 50 mm/min | Screens for contamination-induced embrittlement |
| Oxidative induction time | ASTM D3895-19 | Oxygen flow at 200 °C | Monitors residual stabilizer depletion |
During pellet-to-part conversion on a co-rotating twin-screw extruder with an L/D ratio of 40:1, the feed throat should be maintained below 45 °C to prevent pellet bridging. Barrel setpoints for recycled HDPE typically begin near 180 °C in the feed zone and increase to 220 °C to 240 °C at the metering section; melt temperature measured by an immersion thermocouple should remain below 250 °C to limit chain scission and black speck formation. Backpressure from a melt pump and screen changer should be monitored continuously. Screen packs starting at 60/80/100 mesh are used to capture non-melt particulates; a pressure rise above 80 bar across the screen typically triggers a screen change.
Lot-to-lot bulk density variation in recycled HDPE requires gravimetric feeder calibration for each incoming lot. If the feeder is volumetric, throughput errors between 3% and 8% can occur when bulk density shifts by more than 5%. Extruder torque should be trended against melt temperature and head pressure; a torque increase without a corresponding melt temperature increase often indicates high-molecular-weight tails or solid contamination. In such cases, raising the feed zone temperature by 5 °C to 10 °C may reduce viscosity, but only if downstream melt temperature remains below the degradation threshold. The viscosity ratio at shear rates of 100 s-1 and 1000 s-1 is a better control parameter than melt flow ratio for recycled HDPE because it captures non-Newtonian behavior. A shear viscosity ratio above 3.0 may indicate a broad molecular weight distribution and should be compared with the virgin HDPE baseline used for the part.
Fractional-melt high-density polyethylene generates higher injection pressure than general-purpose blow molding grades. When PIR-HD69BK is substituted into an existing tool designed for a 1.0 g/10 min melt-flow virgin HDPE, clamp force demand may rise by 10% to 20% because of higher melt viscosity and packing pressure. Actual values require a pre-production trial with a cavity pressure transducer; short-shot defects in long flow paths are often caused by low melt temperature or check-ring wear rather than the recycled fraction itself. A melt temperature near 230 °C, a packing pressure between 600 bar and 1000 bar, and a screw rotation speed below 120 min-1 are common starting conditions for black recycled HDPE. Hot-runner manifold temperatures should not exceed 260 °C, and residence time above 8 minutes at that temperature should be avoided because oxidative degradation accelerates and black spec formation increases.
Gate freeze-off time may be shorter in carbon-black-filled recycled HDPE because the filler increases thermal conductivity and nucleates crystallization. Therefore, hold-pressure time should be adjusted using cavity pressure curves rather than virgin HDPE defaults. Mold surface temperature between 20 °C and 40 °C is typical for polyolefin solidification, but rapid cooling may increase warpage in thick sections. For containers or crates with wall thickness above 4 mm, cooling time should be verified with an in-mold thermocouple to avoid premature demolding and post-mold dimensional change.
For corrugated drainage pipe, conduit, and industrial crates, qualification of PIR-HD69BK should compare incoming melt flow rate, density, and notched impact performance to the application-specific virgin HDPE baseline. Pipe-grade formulations often require a notched Izod impact above 6 kJ/m² at 23 °C per ISO 180/1A:2019 or ASTM D256-23, and an environmental stress-crack resistance exceeding 50 h under ASTM D1693-15 Condition B. These values are qualification thresholds, not published grade properties. The purchaser should also evaluate tensile elongation at break; values below 200% on a Type IV specimen may indicate contamination-induced embrittlement in a recycled fraction that would otherwise be expected to retain ductility.
Blending with virgin HDPE is commonly used to reduce variability. Letdown ratios of 20%, 40%, and 60% by mass should be prepared on a weight-controlled blender and compared for tensile yield, elongation, and environmental stress-crack resistance. Because black recycled HDPE may contain more than 2 wt% carbon black, the blend can alter weld-line strength and lower light transmission; visual checks alone are inadequate for structural components.
Post-industrial recycled HDPE differs from post-consumer recycled material primarily in contaminant source, odor, and melt-history uniformity. PCR grades commonly contain residual detergent, food, label adhesive, and polyolefin cross-contamination that require extensive washing and melt filtration; PIR streams are generated before consumer exposure and therefore exhibit lower polar contamination. However, PIR-HD69BK should not be regarded as equivalent to virgin HDPE. Virgin high-density polyethylene is polymerized to a controlled molecular weight distribution, whereas recycled fractions combine multiple original resin grades, additive packages, and pigment systems. Consequently, lot-to-lot melt flow rate and density can drift even when the supplier applies controlled blending.
Compared with broad-specification recycled HDPE, the black designation generally indicates a carbon-black-containing formulation. Carbon black improves ultraviolet resistance and masks color variation but can act as a nucleating agent, shifting crystallization onset to higher temperatures. Differential scanning calorimetry per ASTM D3418-15 may show a crystallization peak between 112 °C and 118 °C depending on cooling rate, but product-specific thermograms have not been published. In applications requiring consistent shrinkage, molders should compare the crystallization exotherm rather than rely solely on melt flow rate.
On a 25:1 L/D single-screw extruder with a barrier screw, PIR-HD69BK may show higher head pressure than virgin HDPE at the same screw speed because recycled molecular weight distribution is often broader and carbon black raises low-shear viscosity. Processing adjustments should be made using head pressure and melt temperature readings from the adapter, not by increasing screw speed alone.
After multiple extrusion passes, recycled HDPE fractions can carry residual thermal history from previous processing. Repeated extrusion passes lower the oxidative induction time and shift the melt flow rate upward. A single-pass addition rate of 100% PIR-HD69BK may be acceptable in thick-wall parts with low surface-area-to-volume ratios, but multiple regrind loops should be monitored by melt flow rate and oxidative induction time per ASTM D3895-19 or ISO 11357-6:2018. A decline in oxidative induction time below 20 minutes at 200 °C indicates that the stabilizer package is depleted and thermal degradation initiators are accumulating.
Cumulative exposure to high shear from melt pumps and screen changers can shift the molecular weight distribution toward lower viscosity, reducing environmental stress-crack resistance. Processing stabilizers should be selected for thermo-oxidative stability, and the use of amine-based antistatic additives should be avoided without compatibility testing because they can antagonize phenolic antioxidants and accelerate melt viscosity drift. Melt filtration through a screen pack of 60/80/100 mesh removes only coarse contamination; if film or sheet clarity is required, finer filtration and a gear pump are necessary.
High ambient humidity imposes a pre-drying requirement on recycled HDPE pellets. At atmospheric relative humidity above 60%, desiccant drying at 80 °C for 3 h to 4 h is common when moisture exceeds 0.05% by ASTM D6980-17. Storage should avoid direct sunlight or temperatures above 40 °C for extended periods because black pellets absorb heat and can agglomerate in bulk bags. Silo residence times above 6 months should be reviewed for antioxidant migration and surface oxidation. The material is not intended for food-contact or pharmaceutical packaging unless the supplier provides a specific regulatory letter; general post-industrial recycled HDPE does not typically carry FDA 21 CFR 177.1520 clearance for direct food contact. Regulatory documentation should be verified against REACH Article 33 and RoHS Directive 2011/65/EU if the converted part is sold into regulated markets. Recycled feedstock may contain legacy substances that are not present in virgin polymer, so a full substance declaration is required when export to the European Union is planned.
