Aclo Compounders HDPE HD0200L is a compounded high-density polyethylene formulation assigned to the extrusion and blow moulding segment of polyolefin conversion. The grade designation follows an internal nomenclature system: the "HD" prefix identifies the base resin as high-density polyethylene with a density band between 0.940 g/cm³ and 0.970 g/cm³ when tested according to ISO 1183-1:2019. The numeric suffix "0200" is not publicly mapped to a certified melt mass-flow rate in the manufacturer's consolidated documentation; published data for this specific configuration is limited. Consequently, processing and performance parameters discussed in this document are constrained to the behaviour of high-density polyethylene resins in the same viscosity class, with grade-specific values identified only where available. The material is supplied as a pelletized compound suitable for downstream conversion on single-screw and twin-screw extrusion lines, injection moulding machines, and blow moulding equipment. Compounding typically incorporates thermal stabilizers, acid scavengers, and processing aids at levels dictated by the end-use compliance envelope. Without a published formulation disclosure, the additive package is assumed to conform to food-contact and potable-water standards where such claims are made by the compounder. For high-density polyethylene resins of the HD0200L viscosity class, density at 23 °C is expected to fall within 0.945 g/cm³ to 0.958 g/cm³. Tensile yield strength typically ranges from 22 MPa to 28 MPa when measured under ASTM D638-14 at 50 mm/min crosshead speed. Flexural modulus values between 900 MPa and 1,200 MPa are representative for this density band under ASTM D790-17. Notched Izod impact resistance, measured according to ASTM D256-10 on 3.2 mm specimens, commonly falls in the range of 30 J/m to 110 J/m, with the lower bound associated with lower molecular weight formulations and the upper bound with high molecular weight or bimodal distributions. Vicat softening temperature for HDPE in this density range is typically between 118 °C and 128 °C under ISO 306:2022 method A50. Melting peak temperature determined by differential scanning calorimetry at 10 °C/min heating rate lies between 125 °C and 137 °C, corresponding to a crystallinity fraction of 55% to 75% depending on cooling history and molecular weight distribution. These are class-level expectations, not certified values for HD0200L.

Molecular Weight Distribution and Melt Rheology

The rheological profile of HD0200L is governed by its molecular weight distribution (MWD), which is not published as a polydispersity index value. If the "0200" suffix is interpreted as a nominal melt mass-flow rate of 0.20 g/10 min at 190 °C under 2.16 kg load per ISO 1133-1:2022, the grade would occupy a low-MFR segment associated with elevated molecular weight and enhanced environmental stress crack resistance (ESCR). This interpretation is not confirmed by the manufacturer's documentation and should be verified by capillary rheometry prior to production line configuration. Capillary rheometry at 190 °C across shear rates of 10 s⁻¹ to 1,000 s⁻¹ is the appropriate method for characterizing shear viscosity. HDPE melts in this class display non-Newtonian shear-thinning behaviour with power-law indices between 0.35 and 0.55 over the relevant shear window. Zero-shear viscosity values for a 0.20 g/10 min MFR resin typically reside between 250 kPa·s and 500 kPa·s. Shear viscosity at 100 s⁻¹ typically falls between 800 Pa·s and 1,500 Pa·s. Operators of injection moulding equipment must account for the increased pressure demand associated with this viscosity plateau; nozzle pressures can exceed 120 MPa in thin-wall tooling with restricted gates. Melt strength and die swell are relevant to blow moulding. Die swell ratios for HDPE in this viscosity class are estimated between 1.8 and 2.4 at shear rates of 100 s⁻¹, but require direct measurement on the production die. Parison sag resistance is not a standard numerical value; it is assessed qualitatively on the line. Under ambient storage conditions below 60% relative humidity, pre-drying of HD0200L is generally unnecessary because polyethylene is not hydrolytically sensitive. Surface moisture from condensation or transit must be addressed: pellets stored below dew point should be brought to hopper temperature for 4 h to 8 h before feeding, or dried in desiccant equipment at 80 °C for 2 h. Excessive moisture manifests as splay and internal bubble formation in extruded profiles and blow moulded parts. Barrel temperature profiles for single-screw extrusion should be staged from 160 °C in the feed zone to 210 °C at the metering zone, with die temperatures held between 190 °C and 220 °C. Melt temperatures above 240 °C accelerate oxidative degradation and increase gel formation, particularly in the presence of stagnated flow regions. The processing window is therefore bounded on the upper side by degradation kinetics; the rate of thermo-oxidative breakdown approximately doubles for each 10 °C increase above 240 °C.

What Distinguishes HD0200L from Other Polyolefin Grades in Downstream Conversion?

HDPE HD0200L is differentiated from low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and medium-density polyethylene (MDPE) by its higher crystallinity, higher tensile modulus, and reduced elongation at break. The principal differentiation is the absence of long-chain branching characteristic of LDPE autoclave or tubular resins; HDPE chains are predominantly linear with short-chain branch content below 4 mol%. This structural difference produces a narrower shear-thinning envelope and higher die swell relative to LDPE at equivalent melt temperatures. Compared with MDPE, HD0200L exhibits a higher density plateau, typically 0.010 g/cm³ to 0.020 g/cm³ above MDPE grades, yielding higher flexural modulus but reduced resistance to slow crack growth. ESCR values for MDPE grades are typically two to five times higher than for HDPE of comparable MFR when tested under ASTM D1693 with 10% Igepal CO-630 at 50 °C. For applications involving strain-hardening or long-term hydrostatic pressure, the choice between HD0200L and an MDPE alternative must be driven by a minimum required time-to-failure under ISO 9080 pipe hydrostatic testing. Relative to LLDPE produced via gas-phase or solution processes, HD0200L offers higher crystallinity and density, but lower puncture resistance and dart impact. LLDPE grades in film conversion typically display dart impact values above 150 g/mil under ASTM D1709, while HDPE of this class falls below 50 g/mil. The substitution of HD0200L into a film line designed for LLDPE would require die gap adjustment and likely a reduction in blow-up ratio due to the lower melt strength of the linear HDPE backbone.

When HD0200L is Processed on Twin-Screw Compounding Lines

Compounding of HD0200L on a co-rotating twin-screw extruder with an L/D ratio of 32:1 to 44:1 requires careful management of specific energy input (SEI). For unfilled compounding of this resin class, SEI values between 0.15 kWh/kg and 0.35 kWh/kg are typical; incorporation of mineral fillers such as calcium carbonate at loadings above 20 wt% can elevate SEI above 0.45 kWh/kg. Screw configurations with two to three kneading blocks in the melting zone are employed for high-molecular-weight HDPE because the melt at 220 °C resists distributive mixing in conveying elements alone. Vent port vacuum should be maintained at -0.08 MPa to -0.09 MPa to remove residual volatiles; failure to maintain vacuum results in surface porosity in subsequent moulding operations. Torque limit is a critical constraint on twin-screw lines processing low-MFR HDPE. Screw speed should be limited to 300 rpm to 600 rpm depending on machine diameter; smaller machines of 25 mm to 40 mm screw diameter can safely operate at higher rotational speeds, while larger machines above 75 mm must derate due to shear heating. Melt temperature at the die should not exceed 230 °C for stabilizer-limited formulations. The temperature window of 180 °C to 230 °C is thus the operative processing band; excursions below the lower bound produce unmelted gels, and excursions above the upper bound consume antioxidant reserves and shorten oxidative induction time. For injection moulding of HD0200L-class material, melt temperatures at the nozzle should be maintained between 190 °C and 220 °C, with mould surface temperatures between 15 °C and 40 °C. Holding pressure must be applied long enough to compensate for the high volumetric shrinkage; typical holding pressures are 60 MPa to 90 MPa, with holding time set to the gate freeze time determined by short-shot studies. Volumetric shrinkage for semicrystalline HDPE is 1.5% to 3.0%, anisotropic with flow orientation. Differential shrinkage between in-flow and cross-flow directions produces warpage in parts with wall thickness transitions exceeding 2:1; this is a documented failure mode on single-cavity industrial tooling. Clamp force requirements scale with projected area. A conservative estimate of 4 kN/cm² to 6 kN/cm² of projected area is recommended for thin-wall parts of 1.5 mm to 2.5 mm wall thickness moulded from this viscosity class. Higher clamp tonnage may be required when processing at the lower end of the melt temperature window due to the exponential rise in melt viscosity.

Property	HD0200L class (low MFR HDPE)	General-purpose HDPE (MFR 5–20)	MDPE	LLDPE
Density (g/cm³)	0.945–0.958	0.950–0.965	0.926–0.940	0.915–0.940
Melt mass-flow rate (g/10 min)	0.15–0.50 (interpretation)	5–20	0.5–5	0.5–2.5
Tensile yield strength (MPa)	22–28	20–30	15–20	8–18
Flexural modulus (MPa)	900–1,200	950–1,350	550–800	250–450
Notched Izod (J/m)	30–110	25–60	100–500	300–700
ESCR (h, ASTM D1693)	50–500	<10	>1,000	>1,000

Evaluating Environmental Stress Crack Resistance and Hydrostatic Behaviour

Environmental stress crack resistance (ESCR) is a critical performance differentiator for the HD0200L molecular weight class. For HDPE resins with low melt mass-flow rate, time to 50% failure under ASTM D1693 condition B generally falls between 50 h and 500 h. The full notch creep test (FNCT) according to ISO 16770 provides a more discriminating evaluation for materials intended for stressed-geometry applications; failure times for this class typically range from 100 h to 1,000 h at 4 MPa and 50 °C in 2% Arkopal N100 solution. These values are class-based; grade-specific FNCT data for HD0200L are not published. Hydrostatic strength under ISO 9080 is relevant for pressure-pipe applications. HDPE grades in the low-MFR segment can achieve minimum required strength (MRS) classifications of PE80 or PE100 depending on comonomer type and short-chain branching distribution. A PE100 classification requires a circumferential stress of 10 MPa to be sustained for 50 years at 20 °C. Confirmation of HD0200L for this classification requires a full three-point extrusion trial and hydrostatic validation, not class extrapolation. The chemical resistance envelope of HDPE HD0200L is governed by its semicrystalline morphology. The material is resistant to aqueous acids, alkalis, and salt solutions up to 60 °C, but aromatic and halogenated hydrocarbons induce swelling and stress cracking. Exposure to toluene at 23 °C produces a mass increase exceeding 10% within 7 days, accompanied by loss of tensile strength. Strong oxidizing acids, including concentrated nitric acid and fuming sulfuric acid, cause surface attack and molecular weight reduction. Processing limitations include avoidance of melt temperatures above 240 °C unless the formulation includes a high-performance antioxidant package. Metal stearate-based acid scavengers in excess of 0.1 wt% should be avoided because these species can migrate to the surface and interfere with printing or adhesive bonding. The material is not suitable for continuous service above 60 °C under sustained mechanical load without creep analysis.

Regulation	Test method / clause	Typical requirement
FDA 21 CFR 177.1520	Extraction testing	Migration limits by food simulant
EU 10/2011	Annex II restrictions	Overall migration ≤ 10 mg/dm²
REACH	EC 1907/2006	SVHC declaration
RoHS	2011/65/EU	Pb, Hg, Cd, Cr6+ limits

Grade-specific documentation for HD0200L should be requested from Acclo Compounders for certified melt mass-flow rate, density, tensile, and impact values before production tooling is committed. The values presented in this document are class-level expectations derived from high-density polyethylene resins of equivalent molecular weight band, and published data for this specific configuration is limited. Batch-to-batch variance on industrial twin-screw compounding lines for low-MFR HDPE formulations is typically controlled within ±0.15 g/10 min for melt flow rate and ±0.002 g/cm³ for density when the compounder maintains ISO 9001 process control; these tolerances do not substitute for lot-specific certificates of analysis. Where the material encounters processing temperatures above 250 °C, resin degradation produces free-radical chain scission that reduces molecular weight and increases MFR beyond specification, detectable by an upward MFR shift and yellowing index increase. Production environments with high humidity above 60% RH require hopper purging with dry air to prevent moisture-induced surface defects. The material should not be blended with LLDPE or LDPE in the melt stream without prior compatibility testing because immiscible melt phases under certain shear conditions can produce delamination in finished wall sections.