| HS Code | 838108 |
| Product Name | Tin Plating Solution (MacDermid Tin Max 100) Electronic/EL Grade |
| Chemical Family | Acid tin electroplating electrolyte |
| Appearance | Clear to slightly turbid liquid |
| Color | Colorless to pale yellow |
| Odor | Slight acidic/characteristic odor |
| Ph | < 1 |
| Specific Gravity | 1.18 – 1.25 at 20°C |
| Boiling Point | Approximately 100°C (212°F) |
| Melting Freezing Point | Approximately 0°C (32°F) |
| Solubility In Water | Miscible in all proportions |
| Vapor Pressure | Similar to water (~23 hPa at 20°C) |
| Vapor Density | Approximately 0.7 (air = 1) |
| Stability | Stable under normal storage and handling conditions |
| Incompatibility | Reactive with strong alkalis, cyanides, and oxidizing agents |
| Hazardous Decomposition Products | Sulfur oxides, tin oxides, and acid mist |
As an accredited Tin Plating Solution (MacDermid Tin Max 100) Electronic/EL Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in a 5 L HDPE jerrican with tamper-evident closure, labeled for electronic/EL grade use, ensuring safe handling and storage of Tin Plating Solution. |
| Container Loading (20′ FCL) | 20′ FCL of Tin Plating Solution (MacDermid Tin Max 100) Electronic/EL Grade, securely packed in sealed drums on pallets. |
| Shipping | Tin Plating Solution (MacDermid Tin Max 100) Electronic/EL Grade is hazardous and ships as UN1760 Corrosive Liquid, N.O.S. (methanesulfonic acid/tin salt), Class 8, Packing Group II. Use UN-approved, corrosion-resistant closed containers with proper venting. Affix corrosive labels. Segregate from cyanides, bases, oxidizers. Follow applicable TDG, 49 CFR, IMDG, or IATA rules for transport. |
| Storage | Store Tin Plating Solution (MacDermid Tin Max 100) Electronic/EL Grade in its original, tightly sealed container in a cool, dry, well-ventilated area away from direct sunlight and heat. Keep separate from incompatible materials, such as strong oxidizers, and use secondary containment to prevent spills. Avoid freezing; maintain stable temperatures and follow the manufacturer’s SDS. |
| Shelf Life | Shelf life: 6 months from manufacture when stored unopened in the original sealed container, protected from freezing and contamination. |
In high-density leadframe strip plating lines running above 8 m/min on copper alloys C19400 and C70250, Tin Max 100 Electronic/EL Grade MSA-based electrolyte is operated at a stannous tin concentration of 22–28 g/L, methanesulfonic acid 140–170 g/L, proprietary grain-refining additive 40–60 mL/L, and antioxidant 2–4 mL/L; replenishment is indexed to ampere-hours at 0.8–1.2 L/10,000 A·h, with the exact figure corrected for drag-out loss, air agitation evaporation, and rinse return. Deposit compliance is governed by ASTM B545-13 for thickness, solderability, and porosity, JEDEC JESD201A for tin whisker susceptibility in lead-free surface finishes, and RoHS 2011/65/EU Annex II for lead content below 0.1 wt%. The strip undergoes alkaline electrocleaning, sodium persulfate microetch, sulfuric acid activation, selective plating through adjustable masking belts using insoluble iridium-tantalum oxide anodes, drag-out recovery, DI rinsing at <0.5 µS/cm, and hot-air drying. Cathodic current density is maintained between 10 A/dm² and 35 A/dm² at bath temperature 45–55 °C; line speed is commonly 6–15 m/min to deposit 3–6 µm of matte tin on leadframe pads and leads. The primary process conflict is edge overplating on stamped leadframes: where solution flow falls below 0.5 m/s across raised features, stannous ion depletion produces local current-density amplification and gross roughness. Terminal product forms include QFN, DFN, SOIC, and TSOP leadframes subsequently singulated or reeled for packaging.
Reel-to-reel selective tin plating of phosphor bronze and brass connector terminals imposes a deposition-rate ceiling set not by electrolyte conductivity but by mass transport, anode passivation, and additive decomposition within the cathode boundary layer. In connector plating, Tin Max 100 working baths are configured at stannous tin 18–24 g/L, methanesulfonic acid 120–160 g/L, grain refiner 30–50 mL/L, and antioxidant 2–3 mL/L; the lower tin metal concentration relative to leadframe baths reduces drag-out on high-surface-area strip and improves rinse-water recovery. Production equipment typically includes a reel-to-reel strip coater with controlled-depth cells, insoluble DSA anodes, and solution delivery nozzles producing 1.0–3.0 m/s cross-flow. Cathodic current density is held at 10–25 A/dm² for stripe widths of 1.0–3.5 mm, yielding deposit thickness of 1.5–4.0 µm at line speeds from 4 m/min to 12 m/min. Compliance verification uses EIA-364-53B nitric acid vapor porosity testing, USCAR-2 automotive electrical terminal performance requirements, IEC 60512-2-1 contact resistance measurement, and J-STD-002 solderability after steam aging. The dominant failure mode on high-speed connector lines is burnt deposit at the trailing edge of the stripe when rectifier ripple exceeds 5% or when additive breakdown products accumulate above 8 g/L total organic carbon. Terminal product types include automotive sensor terminals, USB Type-C connector contacts, board-to-board contacts, and wire-to-board crimp terminals.
Barrel plating of 0402 and 0603 MLCC terminations with pure tin deposits requires control of barrel rotational speed, solution exchange, and component loading because shadowing at the contact point produces variable thickness. The electrolyte for passive-component barrels is maintained at stannous tin 15–25 g/L, methanesulfonic acid 100–150 g/L, Tin Max 100 grain refiner 20–40 mL/L, and wetting agent 1–2 mL/L; the reduced additive level relative to strip plating prevents excessive foam inside enclosed plating barrels. Process compliance follows AEC-Q200 Rev D passive component stress qualification, IEC 60384-1 fixed capacitor generic specification, ASTM B545-13 for deposit requirements, and JEDEC JESD201A for tin whisker risk assessment. The main downstream operation is barrel plating at 0.2–0.8 A/dm², bath temperature 40–50 °C, barrel rotation 8–12 rpm, and submerged barrel fill 30–50% by volume. A representative parameter matrix is shown below. The key process boundary is low-current-density coverage inside the barrel load; below 0.2 A/dm², deposition becomes non-uniform and termination coverage at the inner contact zone falls below 95%, while above 0.8 A/dm² under high barrel loading, localized heating causes organic inclusion and porosity. Filtration through 1 µm polypropylene cartridges and continuous carbon treatment control additive breakdown. Terminal products include 0402, 0603, and 0805 MLCCs, 0402 and 0603 chip resistors, and small-outline passive arrays with matte tin terminations.
| Package size | Barrel loading ratio | Cathodic current density | Plating time | Deposit thickness |
|---|---|---|---|---|
| 0402 MLCC | 30–35% by volume | 0.2–0.5 A/dm² | 50–70 min | 3–5 µm |
| 0603 MLCC | 35–40% by volume | 0.3–0.6 A/dm² | 45–65 min | 3–6 µm |
| 0402 chip resistor | 30–35% by volume | 0.2–0.5 A/dm² | 50–70 min | 3–5 µm |
| 0603 chip resistor | 35–40% by volume | 0.3–0.6 A/dm² | 45–65 min | 3–6 µm |
When press-fit compliant pins for automotive ECU connectors are plated with matte tin, the acceptable thickness window is bounded on the lower end by solderability and corrosion resistance and on the upper end by insertion force. For rack and barrel plating of machined copper alloy pins, Tin Max 100 is maintained at stannous tin 22–28 g/L, methanesulfonic acid 150–180 g/L, grain refiner 40–70 mL/L, and antioxidant 2–4 mL/L; the higher additive concentration preserves ductility after forming and reduces whisker-prone bright deposits. The applicable compliance set includes IEC 60352-5:2020 for press-in connections, IEC 60068-2-20 solderability testing, ASTM B545-13 for tin coating thickness and porosity, and IATF 16949 for automotive production control. The production sequence involves alkaline soak cleaning, electrolytic degreasing, sulfuric acid/hydrogen peroxide microetch, acid activation, tin plating at 5–15 A/dm² and 40–50 °C, drag-out recovery, DI rinsing, anti-tarnish dip, and forced-air drying. A post-plate annealing step at 150 °C for 1 h within 24 h is required on pins destined for high-reliability automotive modules to reduce tin whisker risk under JEDEC JESD201A. The critical operational boundary is hydrogen embrittlement: high-strength copper alloys with hardness above 180 HV may require stress relief before plating, and current density above 15 A/dm² increases hydrogen uptake at blind holes. Terminal product types include backplane compliant pins, ECU header pins, sensor connector pins, and power module press-fit contacts with matte tin thickness of 3–8 µm.
Hydrogen embrittlement in high-strength copper alloys used for EV busbars is governed by alloy condition, plating current efficiency, and the presence of pre-existing cold work from bending. In busbar plating, the Tin Max 100 electrolyte is held at stannous tin 20–26 g/L, methanesulfonic acid 130–170 g/L, grain refiner 30–60 mL/L, and antioxidant 2–4 mL/L; continuous filtration through 5 µm cartridges and carbon polishing limits organic breakdown product accumulation. Compliance for plated busbars is assessed against ASTM B545-13, IEC 60068-2-14:2009 thermal cycling with upper temperature 125 °C to detect adhesion loss, IEC 60664-1:2020 insulation coordination requirements, and RoHS 2011/65/EU Annex II. The downstream production operation is continuous selective plating on copper busbar profiles with insoluble anodes, cathodic current density 5–20 A/dm², bath temperature 40–55 °C, line speed 0.5–2.0 m/min, and deposit thickness 5–15 µm. On rectangular busbar cross-sections, current-density concentration at edges raises local thickness by 20–50% unless conforming anode shields or auxiliary cathodes are used. The limiting production defect is plating out of spec on formed high-strength alloys where hydrogen uptake at the heat-affected zone can exceed 2 ppm and reduce bend performance. Terminal product types include battery interconnect busbars, power distribution unit busbars, and high-voltage module current carriers.
When copper-clad steel component leads require ductile tin deposits after forming operations, the plating bath must sustain low carbon incorporation and fine-grain growth without organic brightener carryover. For axial component leads and jumper wires, Tin Max 100 is operated at stannous tin 18–22 g/L, methanesulfonic acid 100–140 g/L, grain refiner 30–50 mL/L, and wetting agent 1–3 mL/L; the lower MSA level reduces acid attack on steel substrates exposed at cut ends. Compliance is verified by J-STD-002 solderability testing after 8 h steam aging at 93 °C, ASTM B545-13 for minimum tin thickness, JEDEC JESD201A for whisker risk after forming, and RoHS 2011/65/EU Annex II. The downstream process is continuous reel-to-reel or barrel plating, with electrocleaning, copper strike on exposed steel edges, acid activation, tin plating at 5–10 A/dm² and 35–45 °C, drag-out recovery, anti-tarnish treatment, and hot-air drying. Deposit thickness is held at 3–6 µm to withstand lead bending and crimping without exposing the intermetallic layer; post-plating bend testing at 180° on a mandrel diameter equal to lead diameter is performed according to IEC 60068-2-21. Terminal products include axial capacitor leads, diode leads, resistor leads, and tin-plated jumper wires.
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MacDermid Tin Max 100 Electronic/EL Grade is an acidic, methanesulfonic acid-based electrolytic tin plating electrolyte supplied for pure tin deposition in electronics finishing. The product identifier combines the process model Tin Max 100 with a grade qualifier, Electronic/EL, that denotes a contamination-controlled material intended for solderable coatings, connector leads, semiconductor leadframes, and printed circuit board edge contacts. Independent published performance data for this exact formulation are limited; the numerical ranges presented here are therefore representative operating windows for high-speed methanesulfonic acid tin systems unless the current supplier technical data sheet is explicitly cited as the controlling document. The working bath is not a simple stannous salt solution. It contains stannous tin, free methanesulfonic acid, and a proprietary additive package that regulates grain refinement, current-density tolerance, and deposit appearance. For solderable finishes, coating thickness is commonly specified in the 3–15 µm range, and acceptance is evaluated against ASTM B545-13 for electrodeposited tin, J-STD-002 for component lead solderability, or IEC 60068-2-20 for solderability under controlled thermal conditions. The electrolyte itself is not a coating specification; adhesion, thickness, porosity, and solderability are properties of the finished deposit.
Exact lot-release limits for trace cations, anionic residues, and particulate levels are supplier-controlled. Users must obtain the certificate of analysis and the current technical data sheet before qualifying the process. Table 1 lists representative operating windows and analytical controls applied to high-speed methanesulfonic acid tin systems.
| Parameter | Representative window or value | Control method or standard |
|---|---|---|
| Stannous tin concentration | 40–60 g/L | Iodometric titration |
| Free methanesulfonic acid | 150–200 g/L | Acid-base titration |
| Bath temperature | 35–50 °C | Calibrated resistance thermometer in recirculation loop |
| Cathode current density | 5–20 A/dm² | Rectifier current integration and cathode area |
| Deposit thickness for solderable finishes | 3–15 µm | X-ray fluorescence per ASTM B568 |
| Solderability | Wetting after steam aging | J-STD-002 or IEC 60068-2-20 |
| Adhesion | No delamination after bend or tape | ASTM B571 |
In continuous reel-to-reel tin plating, deposit distribution is mass-transport-limited once cathode current density exceeds approximately 10 A/dm². Stannous ion depletion in the near-cathode diffusion layer becomes the controlling variable, and the limiting current density is proportional to bulk stannous tin concentration and the mass-transfer coefficient. Production cells therefore use flooded or jet-plating configurations rather than simple stagnant bath immersion. Solution velocities in the cathode gap typically must be maintained at 2–5 m/s; below this range, edge burning and nodular growth appear first in the highest current-density regions. This constraint is not unique to Tin Max 100 but is inherent to high-speed methanesulfonic acid tin chemistry and cell hydraulics.
On production-scale reel-to-reel lines, the first visible sign of inadequate mass transport is usually a dull or rough deposit at the down-web edges, observed before thickness measurement shows a significant shift. Because the failure is local, increasing average flow rate without addressing flow distribution may not correct the defect. Flood cells, eductor nozzles, and shaped cathode shields are used to redistribute solution velocity. Cathode current density and line speed are then balanced so that the deposition cell reaches the specified thickness within the available plating length.
Temperature also affects bath viscosity and diffusivity. Operation below 35 °C reduces the mass-transfer coefficient and can narrow the bright window, while operation above 50 °C accelerates organic additive breakdown and increases evaporation loss of water and methanesulfonic acid. High-speed cells typically control temperature through external plate-and-frame heat exchangers or cooling coils on the recirculation loop. A recirculation flow rate of 5–10 times the working bath volume per hour is common, but the exact value is dictated by bath volume, heat load, and cell geometry.
Cathode efficiency in methanesulfonic acid tin is high but not 100%. At high current density, hydrogen evolution competes with tin reduction and can produce pitting or roughness. Organic additive concentration must be maintained within the supplier-defined window. Overdosing grain-refining additives can reduce current efficiency, while under-dosing produces coarse, poorly leveled deposits. Hull cell testing at 1 A for 5 min remains a practical qualitative process window check, but it is not a substitute for production-scale thickness mapping and solderability testing.
Anode selection interacts with these mass-transport limits. High-speed methanesulfonic acid tin systems may use soluble tin anodes or insoluble anodes. With insoluble mixed-metal oxide anodes, usually iridium-tantalum coated titanium, anodic current density is commonly maintained below 5 A/dm². Above this threshold, anode passivation can occur, increasing cell voltage and accelerating oxidative degradation of organic additives. On equipment without membrane-separated anolyte compartments, the resulting oxidation byproducts increase carbon loading and may require more frequent carbon filtration. Membrane-separated anodes reduce organic oxidation but add cell voltage and maintenance complexity.
Electronic/EL grade is defined more by impurity exclusion than by tin concentration alone. In semiconductor and connector plating, trace metals from drag-in of acid copper electrolyte, nickel strike, or substrate dissolution accumulate in the tin bath. Copper is particularly detrimental because it can codeposit and reduce solder joint reliability. Iron can degrade additive efficiency and produce rough deposits. The standard control strategy is physical segregation of rinses and dedicated bath equipment. Cross-drag from cyanide or fluoride-containing systems is incompatible with the acidic methanesulfonic acid electrolyte and must be excluded.
Published impurity tolerance data for Tin Max 100 specifically are limited. In acid tin plating generally, copper contamination above 50 ppm may reduce solder wetting, while iron contamination above 100 ppm can promote roughness; the applicable limit for this product must be taken from the supplier quality specification and verified by lot analysis. Unlike carbon-sensitive organic impurities, copper and iron cannot be removed by carbon filtration. Prevention through rinse segregation and low-current dummying is the primary control.
Organic additive breakdown products increase total organic carbon over time. As total organic carbon rises beyond the formulation-specific threshold, deposit brightness may remain acceptable while solderability after steam aging degrades because organic inclusions become embedded in the deposit. Carbon polishing with activated carbon at 1–2 g/L is a standard maintenance practice for methanesulfonic acid tin baths. However, carbon treatment removes both breakdown products and active additives, so it must be followed by additive replenishment and a Hull cell or production panel confirmation. Continuous carbon bypass filtration may be used on high-throughput lines, but the supplier maintenance protocol controls the exact schedule.
Oxygen ingress converts stannous tin to stannic tin. Elevated stannic tin increases turbidity and can reduce cathodic efficiency. Air agitation is generally avoided because it accelerates stannous oxidation. Nitrogen inerting, solution jet agitation, or closed recirculation loops are preferred. The bath should not be treated with hydrogen peroxide unless directed by the supplier, because uncontrolled oxidation can precipitate tin oxides and strip the additive system.
Compared with fluoroborate-based acid tin, Tin Max 100 and other methanesulfonic acid systems eliminate fluoride and boron from the electrolyte, removing the requirement for fluoride precipitation in wastewater and lowering corrosivity toward certain substrates. Fluoroborate tin is capable of high cathode current density but introduces occupational hydrofluoric acid hazards if mixed with acid or heated. Sulfate-based acid tin systems are generally restricted to lower current density and show narrower bright ranges because tin sulfate solubility limits metal concentration and mass transport. The Electronic/EL grade is further differentiated from commodity methanesulfonic acid tin by supplier control of particulate matter, ionic impurities, and organic additive degradation products that are relevant to high-reliability electronic assembly. Table 2 summarizes family-level differences.
| Feature | Tin Max 100 Electronic/EL: methanesulfonic acid tin | Fluoroborate tin | Sulfate tin |
|---|---|---|---|
| Cathode current density | High; representative 5–20 A/dm² | High; often 5–20 A/dm² | Lower; typical 1–4 A/dm² |
| Operating temperature | 35–50 °C typical | 20–40 °C typical | 20–35 °C typical |
| Fluoride or boron waste | None | Fluoride precipitation required | None |
| Additive control | Proprietary brightener and grain refiner; electronic-grade impurity limits | Grain refiner and brightener; high-purity salts required | Grain refiner; limited brightening |
| Primary electronics use | Solderable finishes, leadframes, connectors, high-speed cells | High-speed tin where fluoride handling is acceptable | Lower-speed functional or decorative tin |
Pure tin electrodeposits from acidic methanesulfonic acid electrolytes are lead-free and are used where tin-lead finishes are prohibited under EU RoHS 2011/65/EU and 2015/863. Solderability is a deposit property rather than an electrolyte property alone. It depends on thickness, underlayer, contamination, aging, and post-treatment. Steam aging before solderability testing is controlled by J-STD-002; the required duration depends on the product class and end-use specification. The tin layer must remain free of oxide and organic inclusions at the surface after aging, not only immediately after plating.
Pure tin deposits are subject to tin whisker formation under mechanical stress, temperature cycling, and long-term storage. The electrolyte cannot eliminate whisker risk; deposit stress, substrate, underlayer, and post-plating thermal treatment dominate. High-reliability applications may require whisker testing under JEDEC JESD201 or customer-specific thermal cycling profiles. When whisker risk is unacceptable, a nickel underlayer or an alternative finish may be required by the end-use specification.
For package-level alpha emission, low-alpha tin may be specified to reduce soft-error risk in semiconductor packaging. Package specifications often require 0.05 alpha particles/cm²·h or lower, but the exact limit is package-specific. The user must obtain lot-specific certification from the supplier and verify that the tin feedstock and deposited layer meet the applicable specification. The plating solution alone is not a guarantee of deposit alpha emission.
Pure tin is not generally used where wire bonding is performed directly to the plated finish. Its low hardness and thermal instability make nickel/gold or nickel/palladium/gold finishes more suitable for bond pad service. This limits the use of Tin Max 100 in semiconductor packaging applications where wire bonding directly to the tin deposit is required. Surface insulation resistance after assembly is evaluated at the assembled board level using IPC-TM-650 2.6.3.7, not on the plating electrolyte alone.
