Breplast HDPE TST
- Product Name: Breplast HDPE TST
- Factroy Site: Yinchuan, Ningxia, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Breplast HDPE TST is typically used in formulations when melt flow rate and melt temperature must be controlled within specific ranges.
| HS Code | 107872 |
| Product Name | Breplast HDPE TST |
| Material | High-Density Polyethylene (HDPE) |
| Density | 0.94 - 0.96 g/cm³ |
| Specific Gravity | 0.94 - 0.96 |
| Melt Flow Index | 0.1 - 0.5 g/10 min |
| Thickness Range | 0.5 mm - 3.0 mm |
| Width Range | 1.0 m - 8.0 m |
| Roll Length | 50 m - 200 m |
| Color | Black |
| Surface Finish | Textured both sides (TST) |
| Tensile Strength At Yield | ≥ 15 MPa |
| Tensile Strength At Break | ≥ 25 MPa |
| Elongation At Break | ≥ 700% |
| Tear Resistance | ≥ 100 N |
| Puncture Resistance | ≥ 500 N |
| Carbon Black Content | 2% - 3% |
| Uv Stabilization | Yes |
| Oxidative Induction Time | ≥ 100 minutes |
| Temperature Range | -60°C to +80°C |
| Chemical Resistance | Excellent against acids, alkalis, salts, and hydrocarbons |
| Water Absorption | < 0.01% |
| Friction Angle | > 25° (textured surface) |
| Asperity Height | 0.25 mm - 0.60 mm |
| Service Life | > 20 years |
| Seaming Method | Thermal fusion and extrusion welding |
| Standard Compliance | ASTM D5199, ASTM D6693, GRI GM13 |
As an accredited Breplast HDPE TST factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Breplast HDPE TST is supplied in 25 kg polyethylene-lined paper sacks, palletized, shrink-wrapped, and clearly labeled for safe storage. |
| Container Loading (20′ FCL) | Container loading of chemical Breplast HDPE TST in a 20′ FCL, securely packed in bags/pallets and sealed for sea transport. |
| Shipping | Breplast HDPE TST is shipped as a non-hazardous thermoplastic resin. It is supplied in moisture-resistant bags, boxes, or bulk containers, palletized and shrink-wrapped. Keep dry, away from heat, sunlight, and ignition sources. Not classified as dangerous goods; follow local transport regulations and standard industrial hygiene. |
| Storage | Store Breplast HDPE TST in a cool, dry, well-ventilated area away from direct sunlight, heat, sparks, flames, and strong oxidizers. Keep containers tightly closed, clearly labelled, and upright on stable racks. Protect from moisture, dust, and contamination. Avoid extreme temperatures and incompatible materials. Follow local regulations, use appropriate PPE, and prevent spills or environmental release. |
| Shelf Life | Breplast HDPE TST shelf life: typically 24 months when stored sealed in original packaging in a cool, dry, well-ventilated area. |
What Does UN 1H2 Stack-Load Certification Demand from Breplast HDPE TST?
Breplast HDPE TST is processed in hydraulic injection machines with screw diameters between 60 mm and 90 mm and L/D ratios from 20:1 to 24:1. Melt temperature measured at the nozzle is held at 200 °C to 230 °C; barrel zones are set from 180 °C at feed to 220 °C at metering. Injection pressure is maintained in the range 65 MPa to 90 MPa, with holding pressure between 45 MPa and 65 MPa to eliminate sink marks at thick boss sections and gate areas. Mould temperature is controlled at 15 °C to 30 °C through closed-loop chillers; mould temperatures below 12 °C produce gate blush and weld-line weakening when melt temperature falls below 190 °C. The formulation for UN-rated pails uses Breplast HDPE TST as the 100 phr base resin, carbon black masterbatch at 2.0 wt% to 2.5 wt% for UV resistance, hindered phenolic antioxidant at 0.05 wt% to 0.15 wt%, calcium stearate acid scavenger at 0.05 wt% to 0.10 wt%, and external processing aid at 0.1 wt% to 0.3 wt% to delay melt fracture at thin lip sections. Compliance anchors include UN 1H1 for non-removable-head and UN 1H2 for removable-head packagings, FDA 21 CFR 177.1520 for olefin polymers intended for food contact, EU Regulation 10/2011 for plastic materials in food contact, and REACH Annex XVII restrictions on phthalates and heavy metals. Terminal parts are 5 L to 25 L open-head pails, 60 L bunged drums, and lid/ring closures with stack-load ratings tested under ISO 12048 at not less than 3,000 N.
Extrusion blow-moulding lines running Breplast HDPE TST for 5 L to 25 L jerrycans operate with continuous single-screw extruders of L/D 24:1 to L/D 30:1 and grooved feed sections set at 60 °C to 80 °C. Melt temperature is maintained between 170 °C and 195 °C, with die temperature held 5 °C to 10 °C below melt temperature to reduce die swell and parison sag. Die swell for HDPE in this density range is typically 35% to 50%, requiring die gap settings between 0.8 mm and 1.2 mm for part weights from 250 g to 1,400 g. Blow air pressure is set between 0.6 MPa and 0.9 MPa, while mould temperature is controlled at 8 °C to 14 °C with high-flow water circuits to shorten cooling-limited cycle times. The formulation uses 100 phr Breplast HDPE TST, 0.2 wt% to 0.5 wt% UV stabilizer masterbatch for outdoor agrochemical storage, 0.05 wt% to 0.10 wt% antioxidant, and 0.1 wt% to 0.2 wt% internal lubricant to suppress sharkskin at the die lip. Relevant standards include UN 3H1 for jerricans, ADR/RID packaging instructions P001/IBC05, and EN 12714 for plastic drums and jerricans. Terminal products are 5 L, 10 L, 20 L, and 25 L UN-rated jerrycans for liquid agrochemicals, detergents, and technical-grade solvents. Processing bottlenecks observed on shuttle machines include flash accumulation at the pinch-off zone when die temperature exceeds 190 °C and wall thinning below 0.7 mm when parison programming is not synchronized with mould closing speed.
Corrugated HDPE Pipe and Cable Conduit: Melt Strength, Vacuum Calibration, Ring Stiffness
Breplast HDPE TST is extruded on corrugators with barrel temperatures from 175 °C to 205 °C and melt pump pressure between 15 MPa and 25 MPa. The extruder is typically a single-screw design with L/D 30:1 and a barrier screw, fitted with a melt pump to stabilize output against corrugator vacuum fluctuation. The pipe is formed in continuous mould block systems under vacuum of -0.3 bar to -0.6 bar relative to atmosphere; calibration air is supplied at 0.05 MPa to 0.15 MPa. The formulation contains 100 phr Breplast HDPE TST, carbon black masterbatch at 2.0 wt% to 2.5 wt% to meet UV exposure class A1, antioxidant package at 0.10 wt% to 0.30 wt%, and processing aid at 0.05 wt% to 0.10 wt% to reduce die build-up. Carbon black dispersion must meet ISO 18553 rating ≤ 3. Compliance standards include EN 13476-3 for structured-wall pipes, ISO 9969 for ring stiffness, and EN 61386-24 for buried conduit. Terminal products are DN/OD 110 mm to 800 mm corrugated drainage pipes, slot-perforated land-drain pipes, and corrugated cable duct with nominal ring stiffness SN4 to SN16. A critical threshold exists at melt temperature above 210 °C, which causes sag of unstable corrugation valleys and loss of inner-wall layer adhesion; below 170 °C, weld-line strength at the block-joint interface falls below the 20 kN/m² internal pressure requirement of EN 13476-3.
High-cavitation injection moulding of 28 mm PCO 1881 mineral-water closures from Breplast HDPE TST uses 48- to 72-cavity hot-runner moulds with valve-gated drops and clamp force from 1,500 kN to 3,000 kN. Melt temperature at the nozzle is controlled between 200 °C and 215 °C; mould temperature is set at 8 °C to 12 °C using high-turbulence flow channels, giving cycle times between 4.5 s and 6.5 s. Injection speed is profiled with initial filling at 80 mm/s to 120 mm/s and switch-over to holding pressure at 35 MPa to 45 MPa to avoid flash at the tamper-band undercut. The formulation consists of 100 phr Breplast HDPE TST, 0.05 wt% to 0.15 wt% erucamide slip additive, 0.02 wt% to 0.06 wt% antioxidant, and 0.1 wt% to 0.2 wt% zeolite masterbatch for odour suppression in non-beverage closures. A nucleating masterbatch at 0.05 wt% to 0.10 wt% may be added only when closures are subjected to post-mould hot-fill exposure above 60 °C, because excessive nucleation raises stiffness but reduces ESCR life. Compliance standards include EU 10/2011, FDA 21 CFR 177.1520, and USP 661.1 for pharmaceutical closures. Terminal products are 28 mm water closures, 38 mm aseptic closures, push-in fitments, and child-resistant overcaps. Failure modes include incomplete slit formation in the tamper band when mould temperature falls below 6 °C and ovality above 0.3 mm when holding time is shortened below 0.8 s.
When HDPE Geomembrane Sheet Replaces Flexible PVC in Secondary Containment Liners
Flat-die extrusion of 1.0 mm to 2.5 mm Breplast HDPE TST geomembrane sheet is run on single-screw extruders with L/D 30:1 to L/D 36:1 and a screen changer with 100 mesh to 200 mesh filtration. Melt temperature at the flexible lip die is held between 190 °C and 220 °C; the polished roll stack is operated at 80 °C to 95 °C top roll, 70 °C to 85 °C middle roll, and 50 °C to 60 °C bottom roll to control curl and frozen-in stress. The formulation for a UV-stabilized black geomembrane uses 100 phr Breplast HDPE TST, 2.0 wt% to 2.5 wt% carbon black masterbatch, 0.10 wt% to 0.20 wt% hindered amine light stabilizer additive, and 0.05 wt% to 0.10 wt% antioxidant. Compliance anchors include GRI GM13 for HDPE geomembrane properties, ASTM D5199 for thickness, ASTM D638 Type IV for tensile yield and break, ASTM D1004 for tear resistance, and ISO 527-3. Terminal products are smooth black geomembrane panels of 5.0 m to 7.5 m width, used as secondary containment liners, landfill caps, and pond liners. Process instabilities observed include draw resonance when the draw ratio between die lip and roll nip exceeds 1.15:1, and carbon black dispersion-related micro-perforations when filter pressure rises above 25 MPa.
Accumulator-head blow moulding of 1,000 L IBC inner bottles from Breplast HDPE TST uses machines with clamp force from 3,500 kN to 6,000 kN. The shot size required for an 8.5 kg to 11 kg bottle demands a 120 mm extruder screw with L/D 28:1 to L/D 32:1. Melt temperature is controlled at 180 °C to 200 °C; accumulator head pressure is limited to 25 MPa to prevent memory effects in the parison wall. Parison programming uses a 15 mm to 35 mm die gap with wall-thickness feedback. The formulation contains 100 phr Breplast HDPE TST, carbon black masterbatch at 2.0 wt% to 2.5 wt%, antioxidant at 0.05 wt% to 0.15 wt%, and acid scavenger at 0.05 wt% to 0.10 wt%. Standards include UN 31HA1 for composite IBCs, ISO 16101 for IBC drop testing, and ADR Chapter 6.5. Terminal products are 1,000 L IBC inner bottles, 3,000 L horizontal storage tanks, and closed-loop reuse liners. Operational boundary: post-consumer regrind levels above 20 wt% produce parison surface defects and reduce ESCR life; published data for long-term oxidizer service in this specific configuration is limited, and pre-qualification by permeation testing according to EN 14479 is required.
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- Breplast HDPE TST is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: sales8@ascent-chem.com.
Breplast HDPE TST is a high-density polyethylene resin grade intended for thick-walled pressure pipe, large-part injection moulding, sheet extrusion, and welded chemical tank liners. The product is supplied as natural or carbon-black-compounded pellets with a nominal density of 0.949 g/cm³ according to ISO 1183-1:2019, a melt flow rate of 0.28 g/10 min at 190 °C/2.16 kg according to ISO 1133-1:2022, and a tensile yield stress of 24 MPa according to ISO 527-2:2012. The molecular architecture combines a bimodal molecular weight distribution with controlled 1-hexene comonomer incorporation; the high-molecular-weight fraction contributes slow crack growth resistance, while the lower-molecular-weight fraction enables shear thinning during extrusion. Batch certificates list an oxidation induction time at 210 °C above 20 min under ISO 11357-6:2018, a notched Charpy impact strength at -30 °C of 11 kJ/m² under ISO 179-1:2010, and a Vicat softening temperature of 127 °C under ISO 306:2022 method A50. Flexural modulus is 950 MPa under ISO 178:2019, and Shore D hardness is 62 under ISO 868:2003. These values place Breplast HDPE TST between conventional PE 80 and PE 100 pressure-pipe compounds in stiffness, with deliberately reduced crystallinity to improve resistance to slow crack growth.
What Limits Melt Processing Latitude in Breplast HDPE TST?
Processing is constrained by the thermal window between complete melting of the high-molecular-weight fraction and onset of stabiliser depletion. Capillary rheometry at 210 °C and wall shear rates of 100–1,000 s⁻¹ gives a power-law index of 0.42–0.48; apparent shear viscosity falls from 2.4 kPa·s at 100 s⁻¹ to 0.6 kPa·s at 1,000 s⁻¹. This pronounced shear thinning is characteristic of bimodal high-density polyethylene and requires screw designs that generate sufficient melting without excessive viscous dissipation. Single-screw extruders with grooved feed sections and an L/D of 30:1 to 36:1 are specified; grooved barrels force conveying of the high-molecular-weight powder and permit stable throughput at head pressures between 18 MPa and 25 MPa. Barrel temperature profiles are typically set from 180 °C at the feed throat to 215 °C in the metering section. Melt temperatures above 240 °C increase consumption of the hindered phenol/phosphite stabiliser system, producing melt flow drift and yellowing; the maximum continuous melt residence time at 220 °C is 6 min. Screen packs of 20/40/60 mesh are used to build back pressure and filter char particles. Pre-drying is unnecessary when surface moisture is below 0.05 wt%; if condensation exposure occurs, a desiccant hopper dryer at 80 °C for 2 h is specified. Addition of external process aids is not recommended because changes to die-wall slip can alter wall-thickness control.
Pipe extrusion of Breplast HDPE TST at diameters above 315 mm is generally conducted on grooved-feed single-screw extruders with outputs between 400 kg/h and 700 kg/h, depending on screw diameter and downstream cooling capacity. The die head is maintained at 200–215 °C to limit die swell while preserving melt strength required for open pipe calibration. Vacuum calibration tanks are operated at 0.15–0.25 bar vacuum with counter-current water at 20–30 °C; residual thermal stress is minimised by staged cooling water temperature. For wall thicknesses greater than 60 mm, internal bead cooling is required because the thermal conductivity of HDPE is approximately 0.40 W/m·K under ISO 22007-2:2015. Cooling length should exceed 40 times the pipe diameter for thick-wall sections to prevent centreline voids and density gradients. Regrind from the same production lot may be incorporated up to 20 wt% when regrind particle size is controlled below 4 mm and the material has not been exposed to UV radiation for more than 6 months. Higher regrind fractions reduce the high-molecular-weight chain fraction and increase the probability of notched failure in hydrostatic tests, particularly in the pipe wall centre where cooling rates are lowest.
Slow Crack Growth Resistance Is Governed by the High-Molecular-Weight Fraction
The TST designation is relevant where potable water or wastewater lines carry free chlorine, chlorine dioxide, or monochloramine. Slow crack growth resistance is evaluated with circumferentially notched pipe specimens under ISO 13479:2022; specimens are tested in an aqueous surfactant solution at 80 °C. For PE 100 classification, the material must demonstrate a minimum required strength of 10 MPa at 20 °C for 50 years according to ISO 9080:2012. Published data for this specific configuration is limited, but bimodal high-density polyethylene grades with comparable density and hexene incorporation typically show notched pipe failure times above 1,000 h at 80 °C and 4.0 MPa hydrostatic stress. The formulation includes a hindered phenol primary antioxidant, a phosphite secondary antioxidant, and a high-molecular-weight hindered amine light stabiliser; this combination retards oxidative chain scission that otherwise shortens the slow crack growth stage. Oxidation induction time is measured at 210 °C under ISO 11357-6:2018; values below 10 min after extrusion indicate antioxidant depletion and are treated as a batch nonconformity. In chlorinated water service, addition of carbon black or inorganic anti-chlorine fillers does not replace molecular architecture; the bimodal molecular weight distribution remains the controlling factor in resisting crack propagation through the tie-chain population. Materials with more homogeneous comonomer incorporation in the high-molecular-weight fraction show improved resistance to chlorine-induced degradation, but batch-to-batch variance in comonomer placement should be monitored by thermal fractionation or differential scanning calorimetry.
For large-thickness injection-moulded parts with nominal wall sections between 10 mm and 40 mm, melt temperature is set at 220–235 °C with the upper values used for long flow paths. Clamp force calculations use cavity pressure estimates of 30–40 MPa; packing pressure is maintained at 60–80 MPa to compensate for volumetric shrinkage of 2.0–2.5% measured under ISO 294-4:2018. Injection speed is limited so that flow-front velocity does not exceed 300 mm/s at the gate; shear rates above 10,000 s⁻¹ can raise melt temperature above the 240 °C degradation threshold despite nominal barrel settings. The screw cushion is held at 5–10 mm, and hold time is determined by gate freeze measurement via cavity-pressure decay. Mould temperature is controlled at 15–40 °C; higher temperatures reduce frozen-in orientation but extend cooling time by approximately 1.2–1.5 s/mm of wall thickness. Hot-runner systems require flow channels without stagnant zones, and manifold residence time must not exceed 10 min to prevent gel bodies from appearing on the part surface. Vent depths below 0.02 mm are required to avoid burn marks at the end of fill. For parts with wall thickness above 25 mm, core cooling circuits should be placed no more than 25 mm from the cavity surface to maintain uniform cooling.
Sheet extrusion of Breplast HDPE TST for welded chemical tank liners is performed on single-screw extruders with a melt pump and an adjustable-lip die. Melt temperature at the die is 210–225 °C, and polishing stack rolls are set at 60–80 °C. Sheet thickness above 10 mm requires individually driven rolls in a three-roll stack; roll gaps are set 0.1–0.2 mm narrower than target gauge to compensate for post-cooling expansion. Machine-direction shrinkage is measured at 120 °C for 1 h; values above 2% indicate insufficient melt relaxation and may cause warpage after thermoforming. For thermoforming, heater banks are zoned to bring sheet surface temperature to 150–165 °C; pyrometer verification is required to avoid exceeding 170 °C, at which visible oxidation occurs. Plug materials should be acetal or nylon to reduce sticking; aluminium plugs transfer heat too quickly and cause local chill marks.
When Weld Integrity Governs Joint Design
Butt fusion welding of Breplast HDPE TST pipe is specified according to ISO 21307:2017 procedures. The welding temperature is maintained at 200–220 °C; heater plate surface temperature is verified with a contact pyrometer across at least nine points to ensure a maximum deviation of ±5 °C. Interfacial bead geometry is controlled by fusion pressure, which is calculated from pipe wall area and the melt viscosity of the grade. For a wall thickness of 60 mm, heating time is approximately 6–8 min and cooling time under pressure is 40–60 min; premature release produces centreline cold welds and reduces slow crack growth resistance. Bead dimensions after welding should meet the limits in ISO 21307; excessively large beads indicate overheating, while flat beads indicate insufficient melt penetration. Electrofusion welding is performed at 23–40 °C ambient temperature; terminal voltage and time are taken from the fitting manufacturer’s data, not from generic pipe grades. Scraping of the oxide layer to a depth of 0.2 mm must be completed immediately before assembly to prevent re-oxidation. The material is resistant to stress cracking from weld notches only when the molecular weight distribution retains the high-molecular-weight fraction; overheating above 240 °C during welding destroys this feature and can reduce the weld factor below the 0.8 value assumed in design.
Chemical Resistance, Permeation, and Comparative Material Boundaries
Chemical resistance is assessed by immersion in 98 wt% sulfuric acid, 30 wt% sodium hydroxide, and saturated salt solution at 23 °C for 7 days; weight change typically remains below 1%. The matrix is swollen by aliphatic and aromatic hydrocarbons, and continuous contact with gasoline or toluene lowers yield stress and accelerates environmental stress cracking. Water vapour permeation through a 2 mm sheet is below 0.05 g/m²·day at 23 °C and 85% RH when measured under ISO 15106-2:2005, which is lower than medium-density polyethylene but higher than polyamide or EVOH barrier layers. Standard unimodal high-density polyethylene frequently exhibits ESCR failure times below 100 h under ASTM D1693 condition B, whereas the TST grade is designed for F50 values above 1,000 h. Medium-density polyethylene has better stress crack resistance at the cost of higher permeation and lower tensile stiffness. Isotactic polypropylene offers a higher continuous-use temperature ceiling near 90–100 °C but shows lower impact resistance below 0 °C. Cross-linked polyethylene has superior creep behaviour above 120 °C but cannot be reprocessed or fused with the same welding equipment. PVC offers higher inherent stiffness but is more vulnerable to environmental stress cracking with ester-based plasticisers and has different disposal constraints.
| Property | Test method | Breplast HDPE TST | Conventional high-density PE |
|---|---|---|---|
| Density | ISO 1183-1 | 0.949 g/cm³ | 0.958 g/cm³ |
| Melt flow rate | ISO 1133-1 | 0.28 g/10 min | 0.30 g/10 min |
| Tensile yield stress | ISO 527-2 | 24 MPa | 26 MPa |
| Notched Charpy impact at -30 °C | ISO 179-1/1eA | 11 kJ/m² | 8 kJ/m² |
| ESCR F50 | ASTM D1693 condition B | >1,000 h | <100 h |
Breplast HDPE TST is supplied in pellet form with a bulk density of 0.54–0.58 g/cm³ and is stored at 5–35 °C with relative humidity below 60%. At higher relative humidity, hopper dryers or nitrogen blanketing are specified to prevent surface moisture pickup. Silo residence times above 6 months require nitrogen blanketing to prevent oxidative surface degradation. Food-contact status is not automatic; the base olefin polymer is listed under FDA 21 CFR 177.1520(c) 3.1a and 3.2a when the finished additive package and processing aids are cleared for the intended use. Heavy metals are controlled under RoHS Directive 2011/65/EU Annex II, and phthalate restrictions are governed by REACH Annex XVII entries 51 and 52. Potable water approvals such as BS 6920, AS/NZS 4020, or DIN EN 12873-1 require batch-specific certificates; migration profiles depend on the final formulation and not solely on the base resin. The main operational incompatibility is with amine-based stabilisers and certain flame-retardant additives that can deactivate the phenolic antioxidant package; such combinations should be avoided unless validated by long-term oxidative tests. No post-processing crosslinking is required, and the material remains melt-weldable and recyclable within the same production stream.
