| HS Code | 397644 |
| Materialtype | High-Density Polyethylene (HDPE) |
| Recycledcontent | 100% Post-Consumer Recycled (PCR) |
| Color | Black |
| Form | Pellets |
| Density | 0.955 g/cm³ |
| Meltindex | 6.9 g/10 min (190°C/2.16 kg) |
| Tensilestrengthatyield | 24.8 MPa (3,600 psi) |
| Tensilestrengthatbreak | 20.0 MPa (2,900 psi) |
| Elongationatbreak | 100% |
| Flexuralmodulus | 1.24 GPa (180,000 psi) |
| Notchedizodimpact | 53 J/m (1.0 ft-lb/in) |
| Heatdeflectiontemperature | 80°C (176°F) at 0.45 MPa |
| Vicatsofteningtemperature | 120°C (248°F) |
| Shoredhardness | 65 |
| Moldshrinkage | 0.015-0.025 in/in |
| Moisturecontent | <0.1% |
| Processingmethod | Injection Molding |
As an accredited Birch Plastics HDPE PCR-HD69BK factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg (55 lb) multiwall bags; 40 bags per pallet, totaling 1,000 kg. |
| Container Loading (20′ FCL) | 20′ FCL loading of Birch Plastics HDPE PCR-HD69BK: post-consumer recycled black HDPE pellets in 25 kg bags, palletized, shrink-wrapped, secured. |
| Shipping | Birch Plastics HDPE PCR-HD69BK ships as a non-hazardous, inert thermoplastic resin in moisture-resistant bags or boxes, palletized and shrink-wrapped. Transport in clean, dry trucks or containers at ambient temperature. Avoid heat, direct sunlight, moisture, and contamination. Not DOT/IMDG regulated; follow SDS and local requirements. |
| Storage | Store Birch Plastics HDPE PCR-HD69BK in original sealed bags or containers in a cool, dry, well-ventilated area. Protect from direct sunlight, moisture, heat, and contamination. Keep away from strong oxidizers, acids, and ignition sources. Avoid dust generation and stack securely to prevent package damage. Keep containers closed and labeled when not in use. Follow the manufacturer’s SDS and local regulations. |
| Shelf Life | Shelf life is typically indefinite under cool, dry, dark storage in sealed packaging, away from moisture, heat, and direct sunlight. |
Where a 400 t hydraulic injection press is configured for stackable distribution crates in a non-food reverse-logistics loop, Birch Plastics HDPE PCR-HD69BK is dry-blended at 30–70 wt% with a virgin fractional-melt HDPE. The virgin fraction is selected to hold the blend melt flow rate within the supplier’s lot-specific ISO 1133-1:2022 window at 190 °C/2.16 kg, because post-consumer black feedstock shifts the low-shear viscosity curve more than standard pellet-flow checks indicate. Melt temperature at the nozzle is maintained at 200–225 °C, while feed throat temperature is kept below 55 °C to prevent pellet softening and bridging above the screw. A 50 mm general-purpose screw with 20:1 L/D operates at 80–120 rpm, with backpressure of 0.7–1.4 MPa to homogenize carbon black and residual colourant without excessive shear heating. Mould circuits are run at 15–35 °C, and clamp force is set between 400 t and 650 t depending on cavity number and projected area. Packing pressure of 40–60 MPa is held for 5–8 s before switchover to cooling so that sidewall deflection remains within interlocking stack tolerances. The moulded crate is conditioned for 24 h at 23 ± 2 °C and 50 ± 5 % RH per ISO 291, class 2, before specimens are machined from flat sections and tested for tensile yield stress per ASTM D638-22. Long-term stack creep on the bottom crate is assessed over 3,000 h at 23 °C under compressive loading per ASTM D2990-17. Because recycled HDPE contains trace polyolefin fragments, paper label residues, and occasional metal fines, a short-shot study is required at each lot change, and hot-runner gate diameter is maintained at 1.2–2.5 mm to avoid cold-gate blockage. The finished reusable crate enters a returnable asset pool, and its end-of-life is designed for re-shredding at 60–80 °C below the oxidation threshold of the recycled stabilizer package.
In 60 L monolayer jerrican production on a shuttle blow moulding machine fitted with an 80 mm accumulator head and a 25:1 L/D feed screw, HD69BK is initially introduced at 25 wt% in dry blend with a virgin HDPE blow moulding grade. The limiting specification is not tensile yield; it is low-temperature drop impact after conditioning at −18 °C. Parison swell and sag are re-mapped after every lot change because the post-consumer fraction alters high-load melt index more than standard melt index. The lot release check should include ISO 1133-1:2022 at 190 °C/21.6 kg and ISO 1183-1:2019 density on the melt-blend, not on the pellets alone. Melt temperature at the accumulator head is held at 180–200 °C; mandrel and die are set 10–15 °C below melt temperature to stabilize parison geometry. Blow mould clamp force is 120–180 t for a 60 L jerrican, and blow air pressure is 0.6–0.8 MPa. Cycle time is 90–110 s, but the cooling station may require an additional 15–20 s when PCR content exceeds 40 wt% because black-filled HDPE releases heat more slowly under the higher carbon black content typical of recycled black grades. The finished non-food container is tested under 49 CFR 178.603 drop impact at 1.2 m for Packing Group II, 49 CFR 178.604 leakproofness, and 49 CFR 178.605 internal hydraulic pressure. HD69BK is not used in direct food-contact; a virgin HDPE or EVOH functional barrier would be required because this grade does not carry an FDA 21 CFR 177.1520 reuse position unless explicitly declared in the supplier compliance letter. Final end products are industrial chemical canisters, automotive fluid bottles, and concentrated cleaner packagings labelled as non-food recycled-content containers.
On a 60 mm grooved-feed single-screw extruder producing dual-wall corrugated drainage pipe at 130–160 kg/h, HD69BK is metered at 30–100 wt% of the pipe wall, with the remainder being virgin medium- to high-density polyethylene selected for weld-line and bell-and-spigot puncture resistance. Barrel zones are 180–200 °C, the die head is 190–210 °C, and melt pressure at the breaker plate is maintained below 28 MPa to protect the corrugator block from pressure pulsation. Vacuum sizing pressure of 0.06–0.08 MPa holds the parison against the corrugator mould blocks at 2.0–3.5 m/min line speed. The recycled stream passes through a 60/80/120 mesh continuous screen pack to remove residual paper fibre, aluminium fragments from cap liners, and sand; screen changes are recorded per shift because contaminant load in post-consumer black HDPE is more variable than in plant regrind. The finished pipe is tested for pipe stiffness at 5% deflection per ASTM D2412-21 and is qualified to ASTM F2306/AASHTO M294, which permit recycled HDPE when performance testing replaces a fixed ASTM D3350 cell classification. The limiting failure location is the joint rather than the corrugated body, because recycled carbon black particles can concentrate at the weld line and reduce slit tear resistance. Typical end products are agricultural field drains, stormwater culverts, and underground cable-ducting subject to pedestrian or light-vehicle loading.
| Standard designation | Test condition | Purpose for HD69BK-containing dual-wall pipe | Acceptance input |
|---|---|---|---|
| ASTM F2306 / AASHTO M294 | 23 ± 2 °C conditioning | Qualifies corrugated HDPE pipe with post-consumer recycled content | Profile dimensions, void dimensions, and joint fitment per project drawing |
| ASTM D2412-21 | 5% deflection, test speed 12.5 mm/min | Pipe stiffness of dual-wall corrugated cross-section | Project-specific stiffness class; acceptance determined by purchasing authority |
| ISO 1183-1:2019 | Method A immersion in 23 ± 0.5 °C distilled water | Confirms density of recycled blend remains in the HDPE range after compounding | 0.940–0.965 g/cm³ typical HDPE window, but lot certificate governs |
| ASTM D638-22 | Type IV specimen, 50 mm/min test speed | Tensile yield of welded joint material | Minimum yield stress prescribed by pipe design; lot-to-lot shift tracked |
Sheet production on a 120 mm vented single-screw extruder with 33:1 L/D uses HD69BK at 60–100 wt% blended with a virgin high-density sheet grade. The melt pump holds die pressure at 8–14 MPa; polished roll stack temperatures are 85–95 °C on the top roll and 80–90 °C on the middle roll to prevent surface haze created by carbon black agglomerates. Thickness variation across a 1.6 m sheet is controlled to ±0.05 mm by a motorized flexible-lip die. The hot sheet is conditioned to 135–160 °C surface temperature before entering a shuttle thermoformer with ceramic heaters set at 300–320 °C. Aluminium water-cooled tooling at 20–30 °C forms reusable trays with draft angles of 2–5° and draw ratios up to 1.5:1. The final dunnage tray is impacted at −20 °C in notched Charpy per ISO 179-1:2023 to verify that post-consumer contaminants do not create brittle crack initiation points. Dimensional stability is checked after 48 h at 23 ± 2 °C per ISO 291. Because the recycled material may contain trace paper fines, the melt-filtration system includes 80/120/150 mesh screens; pressure drop across the screen changer is recorded and a change is triggered at 6–8 MPa differential. The produced sheet is not intended for direct food contact or outdoor weathering without a cap layer, because the carbon black loading and recycled stabilizer package are not formulated for long-term UV resistance under ISO 4892-2 testing. End products are returnable material-handling trays, kitting trays, and interlayer dunnage used in automotive part logistics.
On a 50 mm co-rotating twin-screw line with 40:1 L/D and a side stuffer at zone 6, HD69BK is evaluated as a carrier resin for talc and calcium carbonate masterbatches used in rigid packaging compounds. Filler loading is raised in 10 wt% increments from 30 wt% to 45 wt% until specific energy input reaches 0.18–0.25 kWh/kg or die pressure exceeds 14 MPa; above that point, the recycled HDPE carrier is adjusted rather than increasing filler level. The pelletized masterbatch is tested for melt flow rate per ISO 1133-1:2022, ash content per ISO 3451-1:2019, and density per ISO 1183-1:2019. The final compound is injection moulded into pails and crates, where the blend must retain notched Charpy impact of the unfilled reference within 15% at 23 °C per ISO 179-1:2023. Published data for this specific recycled black HDPE configuration is limited, so plant trials are required to map lot-to-lot variation in low-shear viscosity before locking the formulation. The masterbatch is not a finished consumer product but a process intermediate; it is extruded as 3.0 mm cylindrical pellets and dried at 70–80 °C for 2 h when exposed to humidity above 60% RH.
For corrugated electrical conduit extruded on a 45 mm grooved-feed single-screw line at 60–80 kg/h, HD69BK is blended at 80–100 wt% with a virgin HDPE having a bimodal molecular weight distribution to maintain collapse resistance during cable pulling. Barrel zones are 185–195 °C; corrugator vacuum is 0.04–0.06 MPa; line speed is 3–6 m/min for 16–25 mm nominal outside diameter. The recycled compound must contain 2.0–2.5 wt% carbon black for UV stabilization, and dispersion is checked by a pressure-rise method on a 150 mesh screen pack. The finished conduit is tested for dimensional stability, impact, and crushing resistance per NEMA TC 7 and, when applicable, to IEC 61386-24 for buried installations. The product is used as a raceway for buried fibre-optic and low-voltage cable and as non-pressurized drainage conduit for building entrances, not for direct potable-water pressure pipe. Because the grade is black recycled HDPE, it is not suitable for colour-coded circuit identification; surface print adhesion may be lower than virgin HDPE due to contaminants and should be verified by tape-peel adhesion per ASTM D3359.
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Birch Plastics HDPE PCR-HD69BK is a black post-consumer recycled high-density polyethylene resin supplied in pellet form for extrusion and injection molding. The designation identifies an HDPE base polymer, a post-consumer reclaimed feedstock source, and carbon black pigmentation indicated by the BK suffix. Incoming qualification should not rely on nominal datasheet values alone; because post-consumer feedstock blending can shift the melt flow rate by several tenths of a gram per 10 minutes between lots, certificate-of-analysis results should be compared with internal incoming tests. Melt flow rate is determined in accordance with ASTM D1238 at 190 °C under 2.16 kg piston load, density is measured by ASTM D792 or ASTM D1505, and ash content is quantified by ASTM D5630. Carbon black content, where relevant for outdoor service, can be tested by ASTM D1603. Published data for this specific configuration is limited to lot-release documentation and application-specific qualification trials; process windows should be established from the supplier certificate of analysis rather than generic HDPE reference values.
Unlike virgin HDPE, post-consumer recovered high-density polyethylene carries a different thermal history profile. The recycled feedstock has passed through at least one melt processing step and an end-use service life, producing a broader molecular weight distribution and a higher concentration of non-polymeric residues than an equivalent virgin grade with the same nominal melt flow. This difference influences shear-thinning response, die swell, and melt fracture onset. Unlike post-industrial regrind, PCR-HD69BK is derived from end-of-life articles such as crates, containers, and non-food packaging, which can introduce label fragments, barrier residues, and mineral fillers. The BK designation indicates carbon black pigmentation; this addition, typically in the 2.0–3.0 wt% range for UV-resistant HDPE, masks moderate color variation from mixed post-consumer feedstocks and contributes ultraviolet screening.
Comparative acceptance testing should include ASTM D5630 ash analysis, ASTM D638 tensile property verification, and ASTM D1238 melt flow stability across at least three lots. Mixed-color post-consumer HDPE grades often expose wider pigment chemistry and inconsistent visual appearance; HDPE PCR-HD69BK narrows color variation to black but does not by itself narrow melt flow variation. Processors switching from a virgin HDPE grade should anticipate higher filter-pressure accumulation on screen packs, a greater tendency for gel formation in thin films or sheet, and reduced oxidative induction time unless the supplier has incorporated stabilizer additivation. The product difference is therefore not limited to color; it extends to melt filtration requirements, odor threshold, and the allowable stress design of finished parts.
| Parameter | Virgin HDPE | HDPE PCR-HD69BK | Mixed-color PCR HDPE |
|---|---|---|---|
| Feedstock origin | Ethylene polymerisation | Post-consumer recovered HDPE | Post-consumer recovered mixed-color HDPE |
| Color consistency | Natural or lot-specific | Black via carbon black addition | Variable pigment blend |
| Ash content by ASTM D5630 | Typically 0.02–0.10 wt% | Lot-specific; higher than virgin HDPE | Lot-specific; higher than virgin HDPE |
| Melt flow lot-to-lot stability | Tight control | Wider variation | Wider variation |
| UV screening | Requires stabilizer package | Carbon black contributes screening | Pigment-dependent |
For odor, recycled feedstock can retain volatile organic compounds from product residues and labels. Gas chromatography–mass spectrometry headspace analysis may be used to compare total volatile organic compounds; vented extrusion or vacuum devolatilization at -0.08 MPa to -0.09 MPa is commonly required when residual volatiles are detected. Post-industrial regrind generally contains fewer contaminants and more uniform melt flow because it is generated before consumer use, but it is often limited to a single manufacturing source. In contrast, PCR-HD69BK is obtained from broader municipal or retail collection streams, which increases the value of lot-specific ash, moisture, and odor panels.
Before melt processing begins, lot-specific melt flow analysis should be completed for HDPE PCR-HD69BK because the material does not provide the tight viscosity control of virgin polymerization-grade HDPE. For an extrusion-grade high-density polyethylene with a fractional melt index below 1.0 g/10 min, barrel set points between 180 °C and 230 °C are common, but the feed throat must remain water-cooled below 50 °C to prevent pellet bridging. On a 30:1 L/D extruder with a 3:1 compression screw, a screen pack sequence of 40/60/80 mesh provides mechanical filtration without excessive pressure loss. A pressure rise greater than 15 % from the cleaned steady-state value at constant screw speed signals contaminant accumulation on the screen pack; continued operation without changing screens can raise melt temperature by viscous dissipation and can create gel streaks in the extrudate.
Injection molding of recycled HDPE pellets can require melt temperatures near 200 °C and injection pressures in the 600–900 bar range for thin-wall sections. Published HD69BK-specific spiral flow data is limited; tool trials should determine fill time, pack pressure, and cooling time from short-shot studies. Pre-drying at 80 °C for 2 h is recommended only when the resin has been exposed to condensation or relative humidity above 60 %. Because HDPE is not hygroscopic, extended drying is unnecessary and may oxidize the pellet surface. Where blow molding is contemplated, parison sag should be measured on the specific machine; published data for this specific configuration is limited, and tool trials should compare sag behavior at 190 °C against a qualified virgin HDPE reference.
In continuous extrusion, batch-to-batch melt flow variation can originate from the proportion of blow-molded bottles, injection-molded crates, and extrusion pipe scrap in the incoming bale blend. A gravimetric blender at the extruder throat can damp short-term fluctuations when a lot contains segregated pellet fractions; however, blending cannot fully homogenize differences in molecular weight distribution. Melt pressure oscillation greater than ±5 bar at constant screw speed after warm-up indicates inconsistent melt viscosity. Adjusting barrel zone set points or increasing back pressure may reduce the symptom within narrow limits but does not replace proper lot qualification.
Fourier transform infrared spectroscopy serves as an incoming identification check for polyolefin composition but cannot quantify polypropylene contamination at low levels. Differential scanning calorimetry can reveal a melting peak near 165 °C corresponding to polypropylene contamination; a shoulder or secondary melting endotherm above the main HDPE melting peak near 130 °C should prompt further evaluation. Retention of tensile elongation after accelerated weathering is assessed by ASTM D638 following ISO 4892-2 exposure; this is particularly relevant for outdoor profiles and drainage pipe where color alone does not guarantee long-term mechanical integrity. Laboratory-scale extrusion through a 100 µm screen pack can provide an equipment-specific contaminant mass retained per fixed throughput, but no single ASTM method quantifies gel content in recycled HDPE; internal methods must be validated against a reference material.
When carbon black is dispersed below the specification limit, outdoor performance is controlled by loading level and particle size distribution. Carbon black loading in black HDPE for outdoor pipe and profiles commonly falls between 2.0 wt% and 3.0 wt%; HDPE PCR-HD69BK may be formulated within this range, but lot-specific carbon black content must be confirmed by ASTM D1603. Well-dispersed carbon black attenuates photo-oxidation by absorbing ultraviolet radiation and quenching radical species; poorly dispersed agglomerates act as stress concentrations that reduce elongation at break and slow crack growth resistance. Dispersion quality is evaluated under ISO 18553 by preparing thin film samples and counting agglomerate size classes; specifications typically limit agglomerates above 60 µm in critical outdoor applications.
For corrugated drainage pipe and extruded profiles, accelerated weathering can be performed according to ASTM G154 or ISO 4892-2, followed by tensile property retention testing under ASTM D638. Specific exposure duration depends on the product specification; pipe and automotive durability programs may require 2,000 h of accelerated weathering before lot approval. Oxidative stability of the recycled polymer carrier may be lower than virgin HDPE due to residual metal-ion contaminants; oxidative induction time should be determined by ASTM D3895 at 200 °C if sustained thermal endurance is required. Where slow crack growth resistance is a design variable, ASTM F1473 or ISO 13479 testing should be performed because carbon black dispersion alone does not ensure pipe durability.
Because compliance for post-consumer recycled HDPE depends on jurisdiction and end-use contact conditions, HDPE PCR-HD69BK should be evaluated under the following framework. Supplier certificates, test reports, and lot-traceability records are required for each production family group. RoHS compliance is not assumed; when the black polyolefin is used in electrical and electronic equipment, total cadmium and lead screening by X-ray fluorescence should be validated by inductively coupled plasma optical emission spectrometry according to IEC 62321-5. EU REACH communication obligations apply to substances of very high concern above 0.1 wt% at article level. In the absence of a food-contact authorization, HDPE PCR-HD69BK must not be used in direct or indirect food-contact packaging.
| Regulation or standard | Scope and applicability to HDPE PCR-HD69BK |
|---|---|
| EU REACH Regulation (EC) No 1907/2006, Annex XVII | Restricts heavy metals, polycyclic aromatic hydrocarbons, and other dangerous substances; supplier declaration required for each lot. |
| EU RoHS Directive 2011/65/EU | Applicable to electrical and electronic equipment; limits lead 0.1 wt%, cadmium 0.01 wt%, mercury 0.1 wt%, hexavalent chromium 0.1 wt%. |
| US FDA 21 CFR 177.1520 | Olefin polymers used in food contact; post-consumer material is not automatically permitted and requires specific authorization. |
| ASTM D3350 | Polyethylene pipe material designation system; cell classification requires density, melt index, flexural modulus, and slow crack growth testing. |
| ISO 17855-1 | Designation system for polyethylene molding and extrusion materials; recycled content may be declared but does not alter property-class testing requirements. |
For storage and handling, HDPE PCR-HD69BK requires controls against contamination, static accumulation, and moisture uptake. Pellets should be stored in sealed gaylord containers or bags away from direct sunlight and at temperatures below 40 °C. Pneumatic conveying systems should be grounded because carbon black pigmented HDPE pellets can carry static charge; grounding reduces dust adhesion and ignition potential. If storage exposure to relative humidity above 60 % occurs, surface moisture removal at 80 °C for 2 h before melt processing prevents splay in molded parts and bubbles in sheet. Cross-contamination with polypropylene must be controlled because HDPE and PP are incompatible; even small amounts can reduce impact strength measured by ISO 179-1 and can create delamination in extruded sheet. Published data for this specific configuration is limited; processors should therefore validate handling procedures with incoming lot testing and process trials.
