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Zhejiang Joysun Advanced Material Co., Ltd. has been developing and manufacturing specialty plastic additives since 2005, operating from a 32,000 m² production campus in the Dushangang Chemical Industrial Park, Pinghu, China. With an annual output capacity exceeding 70,000 metric tons and more than 600 active clients worldwide, Joysun supplies both raw additives and integrated technical solutions to processors working across PVC, PE, PET, CPVC, and engineering polymer systems. The company holds ISO 9001 certification, multiple national invention patents, and has been recognized as a Zhejiang Province High-Tech Enterprise, a National Innovative SME, and a Provincial "Hidden Champion." Its R&D infrastructure includes a provincial-level postdoctoral research station and ongoing industry-university collaborations with Zhejiang University and Zhejiang University of Technology. Inquiries and technical consultations can be directed through the contact page, and the full product range is listed under the product catalog.
Thermoplastic polyether ester elastomer (TPEE) is a block copolymer that alternates rigid polyester hard segments with flexible polyether soft segments. The resulting material delivers a combination of mechanical strength, chemical resistance, and elastic recovery that conventional rubber or TPU cannot always match across a broad temperature range. Joysun's TPEE manufacturer portfolio currently covers eight standard hardness grades — 3016, 4016, 4320, 45211T, 5518, 6319, 72213, and 8218 — spanning Shore D values from approximately 30D to 82D. The naming convention encodes hardness and melt index so formulators can quickly identify candidates for a given application without running full trials on every grade.
From a processing standpoint, TPEE is compatible with injection molding, extrusion, and blow molding. Melt temperatures typically sit between 200 °C and 240 °C depending on grade, and the material is hygroscopic, so pre-drying at 100–110 °C for 4–6 hours is standard practice before processing to prevent hydrolytic degradation and surface defects. Because hard-segment content governs modulus and heat deflection temperature while soft-segment molecular weight controls low-temperature flexibility, Joysun's range allows processors to dial in the balance needed for automotive connectors, cable jacketing, air intake hoses, industrial couplings, and flexible tubing. Grades with a "T" suffix, such as 45211T, are typically tuned for higher melt stability in thin-wall or long-flow applications. For engineers comparing TPEE to TPU or COPA, key differentiators include TPEE's superior hydrolysis resistance, lower moisture absorption, and retention of elastic modulus at elevated temperatures. Additional application guidance is available on the R&D page.
A chemical foaming agent decomposes at a defined temperature range to release gas — predominantly nitrogen or carbon dioxide — within a polymer melt, creating a cellular structure that reduces part weight, improves sound insulation, controls sink marks in thick-section injection molding, and lowers raw material cost per unit volume. The decomposition temperature, gas yield, residue characteristics, and decomposition rate all determine which foaming agent is correct for a given process and resin.
Joysun's foaming agent program is one of the broadest in China's specialty additives sector. Product families include ADC (azodicarbonamide)-based grades optimized for PVC foam board, wall panels, and advertising boards; low-VOC, low-formamide, low-ammonia ADC variants meeting tightened indoor air quality and export compliance requirements; OBSH and TSH endothermic or exothermic grades for rubber and EVA footwear foam; PE foaming agents for crosslinked and non-crosslinked polyethylene foam sheet; PS foaming agents for polystyrene structural foam; IXPP/IXPE foaming agents for irradiation-crosslinked foam; automotive lightweighting foaming agents formulated for PP, ABS, PA, and engineering polymer injection applications; 3D printing foaming agents for additive manufacturing of lightweight lattice parts; light diffusion board foaming agents for LED back-panel extrusion; and dust-free granular foaming agents designed for clean-room compatible extrusion and injection molding sink-mark prevention. Joysun also synthesizes and supplies pre-dispersed foaming agent masterbatch on a custom basis, which simplifies dosing, eliminates dust exposure on the production floor, and ensures even dispersion in high-viscosity or filled compounds. Foaming agents for advertising board and bathroom cabinet production are covered in detail on the dedicated foaming agents for advertising boards & bathroom cabinet boards page, while wall panel and carbon crystal board applications are addressed on the foaming agents for wall panels page.
Key technical parameters buyers should request when evaluating foaming agents include decomposition onset temperature (Td onset), peak decomposition temperature (Td peak), gas volume at standard conditions (mL/g), particle size distribution (D50, D90), and residue type — since zinc oxide or calcium oxide residues from some ADC formulations interact with tin or lead stabilizer systems and must be accounted for in stabilizer package design.
Lead-free thermal stabilization of PVC has been a regulatory and market-driven transition across Europe, North America, and progressively throughout Asia. Calcium-zinc stabilizer systems have emerged as the dominant lead-free alternative because they offer good early-color performance, acceptable long-term stability, and compatibility with the broad range of co-stabilizers, lubricants, and processing aids used in rigid and flexible PVC formulas. Joysun's PVC Ca-Zn stabilizer product line addresses both one-component powder and liquid systems tailored to specific processing routes and end-use requirements.
Technically, calcium stearate provides primary stabilizer function by displacing labile chloride ions and forming calcium chloride, while zinc stearate acts as a faster-reacting secondary stabilizer to suppress discoloration but must be balanced carefully — excess zinc can trigger zinc burn, a phenomenon where the compound darkens irreversibly due to zinc chloride accumulation. Effective Ca-Zn formulations incorporate auxiliary co-stabilizers such as beta-diketones, polyols (pentaerythritol, dipentaerythritol), hydrotalcite, zeolites, and antioxidants to extend the stability plateau, neutralize HCl evolved during processing, and prevent early zinc burn.
For rigid PVC applications — profiles, pipes, window frames — the stabilizer loading is typically 1.5–3.0 phr with emphasis on long-term oven stability and low plate-out tendency. For flexible PVC calendering of light box fabrics, tent fabrics, and flooring, liquid Ca-Zn systems are often preferred because they integrate easily with plasticizer pre-blends. Stabilizers for foam board applications must also be compatible with the foaming agent selected, as discussed above. Joysun offers application-matched stabilizer grades for advertising boards, bathroom cabinet boards, wall panels, and rigid profiles and pipes — with corresponding technical notes available on the stabilizers for advertising boards, stabilizers for wall panels, and additives for rigid profiles & pipes pages.
PET-based luxury vinyl and rigid core flooring substrates have gained market share over PVC in segments where dimensional stability, low thermal expansion, and scratch resistance are prioritized. However, PET processing for flooring is more demanding than standard bottle or fiber-grade PET because the substrate must be extruded at high throughput, achieve precise density and cell structure if foamed, maintain adequate impact resistance for walking loads, and bond reliably to decorative film layers and UV-cured wear layers. Joysun's PET floor one-pack additive systems are designed to address these simultaneous requirements in a single pre-blended package.
A one-pack format combines chain extenders or branching agents (to restore molecular weight lost during melt processing), nucleating agents (to accelerate crystallization and control crystal size), lubricants (to manage melt viscosity and release), and impact modifiers into a single dosing component. This reduces weighing errors on the production floor, ensures batch-to-batch consistency, and simplifies operator training. The chain extender component is particularly critical in PET flooring because recycled PET — frequently blended into flooring substrates for cost and sustainability — has degraded molecular weight that reduces melt strength and foamability. Chain extenders rebuild the MW distribution and improve melt elasticity. Full manufacturing and process details are available on the PET flooring additive manufacturing & comprehensive technical solutions product page.
Stone plastic composite (SPC) and wood plastic composite (WPC) flooring substrates are among the highest-volume applications for PVC-based compounding globally. SPC core consists of PVC resin, a high proportion of calcium carbonate (typically 60–70 phr), plasticizer (often no external plasticizer in rigid SPC), stabilizer, impact modifier, and processing aids, all extruded through a calendar line to produce a dense, dimensionally stable core. WPC core uses a similar base but incorporates wood flour or natural fiber, which requires careful moisture management and lubricant selection to avoid fiber degradation, porosity, and poor surface quality.
Joysun's SPC/WPC floor one-pack additive systems consolidate the stabilizer, lubricant package, processing aid, and impact modifier into a single component, calibrated for the high-filler loading typical of SPC production. When CaCO₃ loading exceeds 50 phr, internal and external lubrication balance becomes critical — insufficient internal lubrication causes excessive fusion torque and motor overload, while insufficient external lubrication leads to plate-out on die lips and rolls, resulting in surface defects and line downtime. The one-pack approach ensures the lubricant system is pre-optimized at factory level, reducing the variable that most frequently causes quality problems in new SPC lines or when switching CaCO₃ supplier. The PE wood-plastic composite comprehensive technical solutions page covers PE-based WPC formulation in parallel depth.
Chlorinated polyvinyl chloride (CPVC) is a post-chlorinated PVC resin containing 63–69% chlorine by weight, versus approximately 56% in standard PVC. The additional chlorine raises the glass transition temperature and heat deflection temperature by 15–25 °C compared to PVC, making CPVC suitable for hot and cold water distribution pipes, fire sprinkler piping, and industrial fluid handling where service temperatures approach or exceed 90 °C. However, the higher chlorine content also makes CPVC more thermally sensitive during processing — it degrades at lower residence times and at temperatures closer to standard pipe-grade processing conditions, meaning stabilizer and lubricant design is substantially more demanding than for PVC.
Joysun's CPVC one-pack additive formulations address the specific requirements of CPVC pipe and fitting extrusion and injection molding: high thermal stability to cover the broader processing window needed to achieve complete gelation of CPVC resin (under-gelled CPVC pipe fails pressure tests and shows poor impact strength), carefully balanced internal and external lubricants compatible with CPVC's different solubility profile compared to PVC, and stabilizer systems that do not impair the UV resistance or chlorination integrity of the final product. CPVC pipe intended for potable water contact must also use stabilizer and lubricant components that comply with relevant health-based standards. The CPVC comprehensive application solutions page provides additional formulation guidance and product selection criteria.
Polyethylene-based wood-plastic composites differ from PVC WPC in that PE is a non-polar, semi-crystalline thermoplastic with no inherent compatibility with polar wood fiber. Achieving acceptable dispersion, mechanical properties, and surface quality in PE WPC therefore depends on coupling agents (typically maleic anhydride grafted PE, MAPE) to create interfacial bonding between PE matrix and wood flour, as well as lubricants that reduce die pressure, manage melt temperature, and prevent wood fiber scorching at processing temperatures.
Joysun's PE WPC composite lubricant products are designed specifically for the demands of PE/wood extrusion: high thermal stability to resist degradation at 160–190 °C processing temperatures where wood flour begins to discolor and emit odor, compatibility with MAPE coupling agents without reducing coupling efficiency, and sufficient external lubrication to allow high throughput in twin-screw extruders handling 50–70% wood flour loading. A poorly selected lubricant can either inhibit MAPE grafting efficiency (reducing tensile strength and water absorption performance) or cause excessive plate-out that shortens die cleaning intervals. Joysun provides lubricant grades recommended for specific wood flour particle sizes and moisture contents, recognizing that fine flour (80–100 mesh) behaves differently in the melt than coarse flour (40–60 mesh) in terms of compaction and void content. Reference formulations and processing recommendations appear on the PE wood-plastic composite solution page.
PVC by itself has a limiting oxygen index (LOI) of approximately 40–45, which classifies it as inherently flame retardant compared to polyolefins. However, when PVC is plasticized with organic plasticizers such as DEHP or DINP at 40–80 phr — as is common in cable jacketing, flooring, coated fabrics, and artificial leather — the LOI of the compound drops significantly, and meeting UL94 V-0, EN 50575, or IEC 60332 fire classification standards requires additional flame retardant loading.
Joysun's PVC flame retardant products are formulated to address both the gas-phase and condensed-phase flame retardancy mechanisms relevant to plasticized PVC. Antimony trioxide (Sb₂O₃) is a classical synergist with halogen-containing polymers, functioning in the gas phase by forming antimony trihalide and oxyhalide species that interrupt combustion chain reactions. Phosphate ester flame retardants contribute both gas-phase radical scavenging and condensed-phase char promotion, and can partly replace plasticizer volume (acting as reactive or non-reactive plasticizing flame retardants). Aluminum hydroxide (ATH) and magnesium hydroxide (MDH) are endothermic fillers that release water vapor on decomposition, diluting combustible gases and cooling the condensed phase — useful in low-smoke, low-halogen or halogen-free formulations. The selection between halogenated and non-halogenated flame retardant systems depends on the smoke toxicity and corrosivity requirements of the end product, which vary between building wire, automotive interior wiring, railway cable, and marine applications. Detailed flame retardant product grades and corresponding fire classification data are available on the flame retardants solution page.
Noise, vibration, and harshness (NVH) control is a critical performance dimension in automotive body-in-white design, body panel assemblies, and HVAC duct systems. Expandable sealants — also referred to as baffles or acoustic cavity fillers — are applied as uncured or semi-cured solid pucks or tapes at body shop stage, then expand during the vehicle's e-coat oven cycle (typically 170–190 °C for 20–30 minutes) to fill hollow cavities in sills, pillars, roof rails, and A/B/C pillars, blocking the transmission of airborne noise, water ingress paths, and road-borne vibration.
Joysun's NVH expandable sealant products are formulated to activate within the e-coat oven temperature profile without pre-expanding during room-temperature storage or early-stage handling. Expansion ratios, adhesion to oiled steel, aluminum, and primed substrates, and the density profile of the cured foam determine the acoustic insertion loss and structural contribution of the baffle. Key technical considerations for automotive engineers specifying expandable sealants include the activated expansion ratio (typically 2× to 5× by volume), operating temperature range of the cured material, adhesion peel strength to relevant substrates, whether the sealant is compatible with the full e-coat chemistry used in the body plant, and whether it is free of substances of very high concern (SVHC) under REACH. Joysun's automotive-grade sealants are also aligned with the broader lightweighting trend in vehicle manufacturing, where minimizing the density of sound-blocking materials while maintaining acoustic performance is a key design objective — a goal shared with the automotive lightweighting foaming agents in the chemical foaming agent range.
When processors source individual additive components from commodity distributors, formulation optimization is left entirely to the processor's own technical staff, and interactions between stabilizers, lubricants, foaming agents, and impact modifiers may only become apparent during production trials at significant cost. A specialist plastic additives manufacturer with application-specific compounded systems — such as one-packs for SPC flooring, CPVC pipe, or PET substrates — transfers a substantial part of the formulation burden to the supplier, where decades of application testing and patent-backed technology can be applied before the product reaches the factory floor.
Joysun's technical team provides support at the level of raw formulation recommendation, processing parameter optimization, and troubleshooting of surface defects, dimensional instability, and color issues in production. The company's dual-factory structure allows it to fulfill large-volume orders without lead time risk, while its in-house synthesis capability for foaming agents and TPEE means supply chain exposure to third-party raw material disruptions is reduced. For processors evaluating new additive systems, Joysun's R&D center can provide application trials, analytical data, and regulatory documentation support. Company background, certifications, and site information are available on the about us page. Industry news, exhibition schedules, and technical updates are published through the news section. Processors interested in flexible PVC compound additives for calendering, coated fabric, and film applications can also review the additives for flexible PVC products and additives for door panels & door frame profiles pages, while window and venetian blind profile processors will find grade-specific recommendations on the additives for ventilation windows, venetian blinds & tool pegboards page.
