FCFC TAIRISAN SAN NF2200AE is a rigid, amorphous styrene-acrylonitrile copolymer supplied by Formosa Chemicals & Fibre Corporation. The material belongs to the Taïrisan SAN family, in which styrene monomer contributes optical clarity, melt processability, and stiffness, while acrylonitrile comonomer increases resistance to aliphatic hydrocarbons, hardens the surface, and raises heat deflection relative to general-purpose polystyrene. The NF2200AE designation identifies a controlled melt-flow position and additive package that affect mould filling, ejection, and post-mould dimensional stability. Because SAN NF2200AE does not contain a dispersed polybutadiene rubber phase, it differs from ABS terpolymers in the same portfolio by showing higher transparency, higher surface hardness, lower multi-axial impact energy absorption, and a non-impact-modified failure mode. The product is supplied as pellet feedstock with lot-specific melt volume-flow rate, tensile property, and residual monomer documentation. Published numerical values for this specific configuration are limited; the following paragraphs therefore distinguish between manufacturer lot-specific specifications, published reference data for unfilled SAN grades, and production-scale injection moulding conditions.

What Differentiates SAN NF2200AE from General-Purpose Polystyrene and ABS?

In molecular architecture terms, SAN NF2200AE is a random copolymer with a styrene-to-acrylonitrile ratio that the manufacturer does not always disclose on the public grade sheet. General unfilled SAN grades commonly contain between 18 wt% and 35 wt% acrylonitrile; the exact nominal value influences upper service temperature, chemical resistance, and melt viscosity. Compared with general-purpose polystyrene, SAN NF2200AE provides a measurable increase in heat deflection temperature under load, improved resistance to aliphatic oils and dilute aqueous acids, and reduced stress-cracking in contact with surfactants and plasticizers. Compared with ABS, SAN NF2200AE eliminates the rubber-toughening phase. The resulting melt is less shear-sensitive at moderate processing shear rates, while the solid-state behaviour shows higher stiffness and lower notched impact toughness. The absence of butadiene also improves colour stability during indoor weathering and reduces oxidative embrittlement, but low-temperature impact performance remains below that of ABS and high-impact polystyrene. In applications where transparency and dimensional precision take priority over impact toughness, SAN NF2200AE is positioned as an alternative to opaque toughened styrenic compounds or higher-cost transparent engineering resins. Supplier CAE databases for Taïrisan grades typically contain Cross-WLF viscosity coefficients and PVT data; the exact coefficients for NF2200AE should be extracted from the injection moulding simulation file supplied by the manufacturer.

Specification values for melt volume-flow rate are determined in accordance with ISO 1133-1 using a 5 kg load at 220 °C or 230 °C; the exact test temperature for NF2200AE is reported on the certificate of analysis. Tensile stress at yield and tensile elongation at break are measured on type 1A injection-moulded specimens according to ISO 527-2, conditioned at 23 °C and 50% relative humidity for 40 h. Flexural modulus and flexural stress at conventional deflection are determined using ISO 178 at a crosshead speed of 2 mm/min. Heat deflection temperature is measured under ISO 75-2 at 1.80 MPa or 0.45 MPa, and Vicat softening temperature is measured under ISO 306 using method B50. Solid density is reported using ISO 1183-1; unfilled SAN solid density generally lies between 1.07 g/cm³ and 1.08 g/cm³. Water absorption after 24 h immersion at 23 °C is typically 0.2% to 0.3% for unfilled SAN, as determined by ISO 62. Because molecular weight, comonomer ratio, and additive package produce measurable shifts within the SAN family, the manufacturer’s certificate for NF2200AE should be referenced for exact lot values.

Moisture control is critical. SAN resins absorb atmospheric moisture, and processing above 0.1 wt% moisture can generate splay, silver streaking, and surface haze on polished mould surfaces. FCFC TAIRISAN SAN NF2200AE should be dried in a desiccant hot-air dryer at 80 °C for 2 h to 4 h, with a dew point no higher than -30 °C. On production lines using open hopper loaders, batch-to-batch variance in moisture uptake has been observed when ambient relative humidity exceeds 60%; dry-air conveying or closed-loop hopper loading reduces this fault. Melt temperature at the nozzle is maintained between 220 °C and 250 °C. The lower end of that range minimises thermal degradation and yellowing, while the upper end improves thin-wall fill but may increase residual monomer, odour, and colour shift. Mould temperature is set between 40 °C and 70 °C; higher settings improve replication of textured surfaces but extend ejection time. Injection speed profiles are selected to avoid jetting and flow hesitation at abrupt wall-thickness transitions. General-purpose injection moulding screws with an L/D ratio of 20:1 to 24:1 and compression ratio of 2:1 to 2.5:1 are adequate. Shot size should not exceed 80% of barrel capacity to maintain residence time below 5 min when possible; prolonged residence above 250 °C increases yellowing and molecular weight degradation.

When Injection Moulding Requires Controlled Flow and Gate Sizing

For multicavity tools with hot-runner valve gating, SAN NF2200AE is processed with nozzle tip temperatures below 240 °C where drool and stringing are observed. Gate diameter is typically specified between 0.8 mm and 1.5 mm for wall thicknesses from 1.2 mm to 3.0 mm; smaller gates may freeze prematurely and reduce pack pressure transmission in thin sections. At a flow length-to-wall thickness ratio above 180:1, the injection pressure requirement increases sharply, and holding pressure should be switched at 95% to 99% of fill volume to prevent overpacking near the gate. Published data for this specific configuration is limited; mould trials are required to determine the exact pressure-limited fill window on a given tool. Hydraulic injection pressure on medium-flow SAN typically falls between 80 MPa and 140 MPa depending on part thickness and gate geometry. Vent depths in the range 0.02 mm to 0.04 mm are used to avoid burning and short shots.

The solid density and melt compressibility parameters for SAN NF2200AE are used in injection moulding simulation; typical unfilled SAN melt density at processing temperature is approximately 0.95 g/cm³ to 1.00 g/cm³. Mould shrinkage after 24 h post-demoulding generally falls between 0.4% and 0.8% parallel to flow and between 0.5% and 0.9% transverse to flow, depending on wall thickness and pack pressure. These values are not lot-specific; the manufacturer’s grade data sheet should be consulted for shrinkage prediction coefficients for NF2200AE. Failure to account for anisotropic shrinkage causes warpage in flat transparent panels, especially when one side has a textured surface and the other is polished.

FCFC TAIRISAN SAN NF2200AE is used in appliance windows, transparent housings, cosmetic pack components, personal-care jars, water filter reservoirs, battery cases, indicator lenses, and consumer electronics trim. The resin’s gloss and light transmission are suited to parts that require visual clarity without post-mould painting; however, the maximum service temperature is lower than that of polycarbonate or polycarbonate/ABS blends. The grade is not intended for outdoor glazing exposed to continuous UV without protective stabiliser addition. For indoor applications with intermittent chemical contact, SAN NF2200AE provides a balance of stiffness and chemical resistance. In electronically sealed products, the moulded part may require annealing at 70 °C to 80 °C for 1 h to 2 h to relieve moulded-in stress before exposure to aggressive sealing greases or solvents. Failure to anneal can lead to delayed environmental stress-cracking at bosses and weld lines.

Ultrasonic welding, hot-plate welding, and solvent bonding parameters

Ultrasonic welding of SAN NF2200AE is carried out at 20 kHz with near-field horn amplitude from 25 μm to 40 μm; weld pressure between 0.2 MPa and 0.5 MPa is common for unfilled SAN. Joint design requires a shear or energy director configuration; overly large energy directors produce particulate flash and microcracks at the weld interface. Hot-plate welding can be performed with plate temperatures of 220 °C to 260 °C; the upper range risks stringing and surface gloss loss. Solvent bonding with ketones, esters, or chlorinated solvents can be used only with controlled ventilation and customer-specific process validation, because these agents are also stress-cracking solvents for SAN. Aliphatic hydrocarbon adhesives have limited bond strength due to low solvency. Mechanical joining with self-tapping screws should avoid overtorqueing around bosses; moulded-in stress in an unannealed boss combined with thread engagement pressure can cause radial cracking. Boss outer diameter is typically 2.0 to 2.5 times the screw nominal diameter, and wall thickness at the boss base is held below 60% of the adjacent nominal wall to reduce sink marks without sacrificing pull-out resistance.

Chemical resistance boundaries and environmental stress-cracking cannot be inferred from short-term immersion alone

Short-term immersion testing under ISO 175 provides a preliminary indication of chemical attack, but environmental stress-cracking behaviour is more reliably screened under constant-strain methods such as ISO 22088-3 or ASTM D543. SAN NF2200AE generally resists dilute aqueous acids, alkaline solutions, aliphatic mineral oils, vegetable oils, and common household detergents. Concentrated oxidising acids, aromatic hydrocarbons, chlorinated solvents, ketones, esters, and some glycol ethers can swell or craze the surface. The chemical resistance boundary of SAN NF2200AE is different from that of ABS: disappearance of the butadiene phase removes a susceptible site for oxidative attack but also reduces impact energy available to resist crack initiation. Before use with proprietary packaging formulas, the manufacturer’s chemical resistance database or a constant-strain jig test should be applied, because subtle differences in surfactant concentration, plasticiser type, and service temperature can shift the failure threshold. At temperatures above 50 °C, stress-cracking activity of many organic media increases markedly; continuous exposure above the Vicat softening region is not recommended.

The following documentation matrix applies to industrial and electronic applications. Product-specific compliance must be confirmed by the supplier.

Within the Taïrisan SAN portfolio, the NF2200AE grade is most closely aligned with high-flow, thin-wall injection moulding. Lower-flow SAN grades may show better thick-section packing and lower orientation stress, but they require higher injection pressures at equivalent part wall thickness. Higher-flow SAN grades may fill longer flow lengths but can show increased gate stringing and reduced mechanical property retention after repeated processing. The additive package in NF2200AE is formulated for demoulding in polished, high-gloss cavities; the exact lubricant and antistat content is not publicly listed. Published data for this specific configuration is limited, and any direct substitution into an existing tool should be confirmed by mould shrinkage measurements, melt viscosity curve comparison, and a full dimensional capability study on the target machine.

In production-scale quality assurance, incoming resin lots are checked for melt volume-flow rate deviation from the supplier’s target. A lot with MVR outside the agreed control window can alter pack pressure, part weight, and gate-freezing time in multicavity tools; statistical process control charts on part weight and cavity pressure curves are used to detect extended residence or drying faults. FCFC TAIRISAN SAN NF2200AE is distinguishable from lower-flow SAN grades by its mould-filling response at equivalent wall thickness; it is distinguishable from GPPS by its resistance to stress-whitening in the presence of mineral oil; and it is distinguishable from ABS by the absence of a butadiene phase and by a transparent, non-impact-modified failure mode. The operational boundary for this product is established by the grade-specific certificate of analysis, not by generic SAN data.