Across uncoated exterior trim programmes for light vehicles, Shandong Lijin Petroleum ASA LHY6700 is processed as a high-flow weatherable styrenic copolymer for components that must retain dimensional stability and low-gloss surface appearance without paint. The relevant compliance framework includes ISO 4892-2:2013 xenon-arc weathering, ASTM D638-14 tensile testing, ISO 178:2019 flexural property testing, ISO 179-1/1eA Charpy notched impact testing, and ISO 1133-1:2022 melt volume-flow rate verification. EU market requirements additionally reference REACH Regulation (EC) No 1907/2006 and RoHS Directive 2011/65/EU as amended by (EU) 2015/863. A starting formulation for black, grey, and dark automotive trim uses 100 parts LHY6700 pellets with 2–4 parts by weight of weatherable colour masterbatch; if matte surface values below 30 GU at 60° are required, a styrene-based matte modifier may be evaluated at 4–6 parts, with impact retention checked by ISO 179-1/1eA. In production-scale moulding, the pellets are pre-dried in a desiccant dryer at 80 °C for 3–4 h to a residual moisture below 0.05 %; when plant relative humidity exceeds 60 %, pre-drying must not be omitted or shortened. The injection moulding machine uses a general-purpose screw with L/D ratio 20:1–24:1 and compression ratio 2.3:1–2.8:1; barrel temperatures are set between 230 °C and 250 °C, nozzle temperature 240–255 °C, and mould temperature 40–70 °C. Packing pressure is held in the range 60–80 MPa, and clamp force is calculated from a melt pressure of 35–50 MPa over the projected area. Production failure modes observed on multi-cavity tools include brittle knit-line fracture when the mould falls below 35 °C or when plant regrind exceeds 20 wt%; batch-to-batch pellet moisture differences require desiccant bed regeneration verification. Terminal part types include exterior mirror housings, cowl vent grilles, A-pillar claddings, roof ditch mouldings, and wiper arm caps.

Coextruded ASA LHY6700 Capstock Over PVC Profiles: Rheological Mismatch, Layer Thickness and Gloss Retention

In PVC profile coextrusion, Shandong Lijin Petroleum ASA LHY6700 is not used as a bulk additive but as a weatherable cap layer supplied to the feedblock as a separate melt stream. The relevant standard for the finished window and door profile is EN 12608-1, supported by EN 513:2018 for artificial weathering of unplasticized PVC profiles and ISO 4892-2:2013 for colour and gloss retention. EU construction products may also require Regulation (EU) No 305/2011 performance declarations when applicable. The cap-layer formulation addition ratio is set as 100 parts LHY6700 combined with 4–7 parts by weight of outdoor-grade colour concentrate; the substrate remains a separately stabilised PVC compound. The cap layer is not used as a thin coating diluted into the PVC melt, because dilution below approximately 85 % ASA in the cap reduces UV screening and accelerates chalking. Coextrusion equipment splits the streams: the PVC main extruder is a counter-rotating twin-screw unit operating at 180–200 °C, while the ASA cap layer is plasticated in a single-screw extruder of 30–45 mm diameter and L/D 24:1–30:1 at 215–235 °C. The two melts are joined in a multi-manifold die or feedblock; cap layer thickness is controlled at 0.3–0.5 mm. In production-scale runs, interfacial waviness, post-forming delamination, and gloss banding have been traced to viscosity mismatch at the joining plane. Processors should characterise capillary viscosity of LHY6700 per ISO 11443:2021 at shear rates of 100 s⁻¹ and 1,000 s⁻¹ and keep the ASA/PVC melt viscosity ratio at the die temperature within 2:1. Layer thickness below 0.15 mm leads to premature UV screening loss and surface cracking; above 0.8 mm, differential solidification raises interfacial stress and delamination risk. Cap-layer regrind is not reworked into the cap layer because it increases surface defect density and lowers gloss retention. Calibrator water temperature is typically 25–45 °C, vacuum 20–80 kPa, and line speed 1.5–4 m/min. Finished product types include window lineals, fascia, soffit, exterior cladding, and door profiles.

Can LHY6700 Be Used in UL 746C Outdoor Electrical Enclosures Without Flame Retardant Modification?

Outdoor electrical enclosure specifications impose simultaneous weathering and electrical safety requirements. Shandong Lijin Petroleum ASA LHY6700 can be processed into outdoor terminal boxes and meter housings only after the grade-specific UL 746C outdoor suitability and UL 94 burning class are confirmed. The applicable test framework includes UL 746C for UV, water exposure, and cold impact, IEC 60695-11-10 for ignitability, ISO 178:2019 for flexural modulus, and ASTM D256-23 for notched Izod impact. Flame class must not be assumed; unless the LHY6700 technical data sheet and UL Yellow Card explicitly list a flame-retardant package, the grade is treated as a general-purpose weatherable ASA, and any UL 94 V-0, V-1, or 5VA claim requires separate compound qualification. The formulative addition ratio is 100 parts LHY6700 with 2–4 parts of carbon black masterbatch for black UV-resistant enclosures; for custom grey or beige parts, 1–3 parts of outdoor-grade colour masterbatch may be used, but the effect on UL 746C f1 outdoor suitability must be evaluated. Production injection moulding uses a desiccant dryer at 85 °C for 4 h to below 0.05 % moisture, barrel profile 235–250 °C, melt temperature 240–255 °C, mould temperature 40–70 °C, and packing pressure 60–80 MPa. Enclosure wall sections are commonly 2.5–6.0 mm. Insufficient drying or excessive screw recovery speed produces surface splay and corner boss cracking in production lines. Because grade-specific relative thermal index values are product-specific, UL 746B RTI for LHY6700 should be obtained from the UL Yellow Card; published data for this specific configuration is limited. Terminal product types include outdoor junction boxes, electricity meter housings, terminal enclosures, and control cabinet covers.

Portable outdoor power equipment housings moulded from LHY6700 are specified where impact resistance, incidental fuel and oil contact, and multi-year UV exposure must be balanced without secondary painting. The primary electrical safety standard for hand-held motor-operated tools is EN 62841-1:2015, and material qualification generally includes ISO 4892-2:2013 weathering, ISO 179-1/1eA Charpy notched impact, ISO 527-2 tensile properties, and ISO 175:2010 chemical resistance against mineral oil and garden chemicals. The starting formulation is 100 parts LHY6700 with 2–5 parts of colour masterbatch; parts exposed to frequent debris abrasion may incorporate 0.5–1.5 parts of a slip/anti-scratch additive masterbatch, subject to Charpy notched impact retention. Injection moulding requires pre-drying at 80 °C for 3–4 h to residual moisture below 0.05 %, melt temperature 230–250 °C, and mould temperature 40–65 °C. Long handle housings with rib-to-wall ratios above 0.6:1 are produced with sequential valve gating or gas-assisted moulding to avoid weld-line collapse. Operational boundary conditions should exclude continuous exposure to mixed fuels above 40 °C unless chemical resistance data for the specific fuel blend are available. Terminal product types include line trimmer housings, leaf blower cowls, electric mower deck shrouds, and hedge trimmer gear cases.

When LHY6700 Is Extruded into Corrugated Roofing Sheet at Line Speeds Above 3 m/min

Corrugated outdoor sheet extrusion exposes LHY6700 to continuous melting history and high draw rates; the process is controlled by melt strength, residual moisture, and roll stack temperature. Relevant standards for exterior plastic sheets include ISO 4892-2:2013 for weathering, EN 1013:2012 for light-transmitting single-skin profiled sheets, and ISO 8256 for tensile-impact strength; building-facing products may also require reaction-to-fire classification according to EN 13501-1. The formulation addition ratio is 100 parts LHY6700 with 2–3 parts of UV-stabilised pigmented masterbatch; translucent or light-diffusing sheet uses 0.5–1.0 part of a transmission-compatible colour package to retain diffuse transmittance. Extrusion is normally run on a single-screw extruder of 60–90 mm diameter and L/D 30:1–33:1, using a barrier screw and Maddock mixer, melt pump, and coathanger die. Melt temperature is held at 225–245 °C, and the three-roll polishing stack is set to 75–90 °C. Residual moisture in LHY6700 must be below 0.05 %; at higher moisture, longitudinal haze lines and surface splay become visible in sheet above 1 mm thickness. Production-scale sheet lines above 3 m/min exhibit edge sag and melt surging if melt pump inlet pressure is not held stable; sheet thickness is typically 0.8–3.0 mm. Terminal products include corrugated carport panels, outdoor sign boards, farm canopy sheets, and formed cladding inserts.

For Spa Shells and Marine Covers, Chemical Resistance Limits Processing Conditions

In spa, pool, and marine applications, Shandong Lijin Petroleum ASA LHY6700 is specified for weather-holding surfaces, but the operational boundary is chemical resistance: continuous immersion in oxidising sanitizers or hot water above 60 °C can reduce impact properties. The relevant test framework is ISO 4892-2:2013 for UV stability, ISO 175:2010 for chemical resistance of plastics, ISO 179-1/1eA for Charpy notched impact at −30 °C, and ASTM D256-23 for notched Izod. For coextruded spa shells, LHY6700 is run as the outer cap layer at 100 parts with 3–5 parts weather-resistant colour masterbatch over an ABS substrate; total sheet thickness is commonly 4–8 mm. Thermoforming uses sheet surface temperature 150–170 °C, aluminium mould temperature 60–80 °C, and controlled plug assist to prevent wall thinning below 40 % of original sheet thickness. Injection-moulded pool step housings and deck drains use melt temperature 230–250 °C and mould temperature 45–70 °C. Aromatic solvents, ketone-based cleaners, and concentrated bromine tablets should not contact the part during service. Terminal product types include spa shells, pool skimmer lids, deck drain covers, marine instrument housings, and small hatch covers.