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Indium Solder Paste
Selection Guide

Answer four questions to find the right Indium paste for your process.

At A Glance
Alloy
Lead-Free / Leaded / Low-Temp
SAC305 (Sn96.5Ag3Cu0.5) is the standard RoHS lead-free alloy. Sn63/Pb37 is eutectic leaded. 57Bi/42Sn/1Ag is a low-temperature alloy (~170°C peak) for sensitive components or step soldering.
Flux type
No-Clean vs Water Wash
No-Clean (NC) residues are safe to leave on the board. Water Wash (WS) must be cleaned with DI water after reflow - required for certain inspection and ionic cleanliness standards.
Powder size
T3 / T4 / T5
Type 3 (25–45 µm) suits standard SMT (0402+). Type 4 (20–38 µm) for fine-pitch (0201, QFN, µBGA). Type 5 (15–25 µm) for ultra-fine pitch and micro-BGA.
Halogen-Free
HF Certification
Tested per EN14582 to IEC 61249-2-21. Required for products destined for markets prohibiting halogenated flame retardants. Look for "HF" in flux name (8.9HF, 6.6HF, 3.2HF, etc.).
Container
Jar vs Cartridge
500g jars are open-top for hand printing or low-volume stencil use. 600–700g cartridges load directly into pneumatic or automatic stencil printers.

Product finder

STEP 1:What alloy do you need?
Recommended products for your process

Complete SKU reference

Pemro SKUIndium P/NFluxAlloyTypeCleanH-FreeContainerSize
IND-1006 82320-500g SMQ92J Sn63/Pb37 T3 NC Yes Jar 500g
IND-1005 800164-600g 3.2 SAC305 T3 WS No Cartridge 600g
IND-1004 800164-500g 3.2 SAC305 T3 WS No Jar 500g
IND-1012 800449-700g 8.9 SAC305 T3 NC No Cartridge 700g
IND-1011 800449-500g 8.9 SAC305 T3 NC No Jar 500g
IND-1119 800495-600g 8.9HF SAC305 T4 NC Yes Cartridge 600g
IND-1084 800420-600g 8.9 SAC305 T4 NC No Cartridge 600g
IND-1002 800463-700g 6.3 Sn63/Pb37 T3 WS Yes Cartridge 700g
IND-1038 800577-500g 6.3 Sn63/Pb37 T4 WS Yes Jar 500g
IND-1083 800420-500g 8.9 SAC305 T4 NC No Jar 500g
IND-1160 800316-500g 3.2 SAC305 T4 WS No Jar 500g
IND-1235 801641-600g 6.6HF SAC305 T4 WS Yes Cartridge 600g
IND-1046 800714-600g 8.9HFA SAC305 T3 NC Yes Cartridge 600g
IND-1363 800662-600g 8.9HF SAC305 T4 NC Yes Cartridge 600g
IND-1120 801065-500g 10.1 SAC305 T4 NC No Jar 500g
IND-1115 800495-500g 8.9HF SAC305 T4 NC Yes Jar 500g
IND-1091 800514-500g 8.9E SAC305 T3 NC No Jar 500g
IND-1126 800550-700g 8.9HF Sn63/Pb37 T4 NC Yes Cartridge 700g
IND-1121 800315-600g 3.2 SAC305 T4 WS No Cartridge 600g
IND-1239 800413-600g 3.2 SAC305 T4 WS No Cartridge 600g
IND-1305 800517-500g 3.2 SAC305 T4 WS No Jar 500g
IND-1306 800517-600g 3.2 SAC305 T4 WS No Cartridge 600g
IND-1277 801641-500g 6.6HF SAC305 T4 WS Yes Jar 500g
IND-1298 801643-500g 6.6HF SAC305 T3 WS Yes Jar 500g
IND-1299 801643-600g 6.6HF SAC305 T3 WS Yes Cartridge 600g
IND-1370 803090-600g 6.6HF SAC305 T5 WS Yes Cartridge 600g
IND-1301 800640-500g 3.2HF SAC305 T3 WS Yes Jar 500g
IND-1302 800640-600g 3.2HF SAC305 T3 WS Yes Cartridge 600g
IND-1303 801159-500g 3.2HF SAC305 T4 WS Yes Jar 500g
IND-1304 801159-600g 3.2HF SAC305 T4 WS Yes Cartridge 600g
IND-1295 800449-600g 8.9 SAC305 T3 NC No Cartridge 600g
IND-1092 800514-600g 8.9E SAC305 T3 NC No Cartridge 600g
IND-1293 800515-500g 8.9E SAC305 T4 NC No Jar 500g
IND-1294 800515-600g 8.9E SAC305 T4 NC No Cartridge 600g
IND-1291 800494-500g 8.9HF SAC305 T3 NC Yes Jar 500g
IND-1292 800494-600g 8.9HF SAC305 T3 NC Yes Cartridge 600g
IND-1088 800595-600g 8.9HF1 SAC305 T3 NC Yes Cartridge 600g
IND-1288 800595-500g 8.9HF1 SAC305 T3 NC Yes Jar 500g
IND-1289 800596-500g 8.9HF1 SAC305 T4 NC Yes Jar 500g
IND-1290 800596-600g 8.9HF1 SAC305 T4 NC Yes Cartridge 600g
IND-1296 801077-500g RMA-155 SAC305 T4 NC Yes Jar 500g
IND-1297 801077-600g RMA-155 SAC305 T4 NC Yes Cartridge 600g
IND-1285 800714-500g 8.9HFA SAC305 T3 NC Yes Jar 500g
IND-1286 800693-500g 8.9HFA SAC305 T4 NC Yes Jar 500g
IND-1287 800693-600g 8.9HFA SAC305 T4 NC Yes Cartridge 600g
IND-1276 801065-600g 10.1 SAC305 T4 NC No Cartridge 600g
IND-1229 PASTEOT-801574-500g 10.8HF SAC305 T5 NC Yes Jar 500g
IND-1166 800728-500g 5.7LT 57Bi/42Sn/1Ag T3 NC Yes Jar 500g
IND-1134 800728-600g 5.7LT 57Bi/42Sn/1Ag T3 NC Yes Cartridge 600g
IND-1007 82320-700g SMQ92J Sn63/Pb37 T3 NC Yes Cartridge 700g
IND-1278 82698-500g SMQ92H Sn63/Pb37 T3 NC Yes Jar 500g
IND-1079 82698-700g SMQ92H Sn63/Pb37 T3 NC Yes Cartridge 700g
IND-1364 800618-600g 8.9HF Sn62.6/Pb37/Ag0.4 T3 NC Yes Cartridge 600g
IND-1076 82453-500g SMQ92J Sn63/Pb37 T4 NC Yes Jar 500g
IND-1077 82453-700g SMQ92J Sn63/Pb37 T4 NC Yes Cartridge 700g
IND-1080 83685-500g SMQ92H Sn63/Pb37 T4 NC Yes Jar 500g
IND-1274 83685-700g SMQ92H Sn63/Pb37 T4 NC Yes Cartridge 700g
IND-1279 801079-500g RMA-155 Sn63/Pb37 T4 NC Yes Jar 500g
IND-1280 801079-700g RMA-155 Sn63/Pb37 T4 NC Yes Cartridge 700g
IND-1003 800463-500g 6.3 Sn63/Pb37 T3 WS Yes Jar 500g
IND-1281 801644-500g 6.6HF Sn63/Pb37 T3 WS Yes Jar 500g
IND-1282 801644-700g 6.6HF Sn63/Pb37 T3 WS Yes Cartridge 700g
IND-1253 801642-500g 6.6HF Sn63/Pb37 T4 WS Yes Jar 500g
IND-1275 801642-700g 6.6HF Sn63/Pb37 T4 WS Yes Cartridge 700g

Glossary

SAC305Sn96.5Ag3.0Cu0.5 - the dominant RoHS-compliant lead-free alloy for reflow soldering.
Sn63Sn63/Pb37 eutectic leaded alloy. Melting point 183°C. Used under RoHS exemptions or for legacy compatibility.
57Bi/42Sn/1AgLow-temperature BiSnAg alloy. Peak reflow ~170°C - for temperature-sensitive components and step soldering over existing SAC or SnPb joints.
Type 3Powder 25–45 µm; standard SMT, 0402 and larger.
Type 4Powder 20–38 µm; fine pitch - 0201, QFN, µBGA.
Type 5Powder 15–25 µm; ultra-fine pitch - micro-BGA, 01005 components. Consult Indium applications engineering before qualifying.
NCNo-Clean - flux residues are non-corrosive and do not require removal after reflow.
WSWater Soluble - flux must be cleaned with DI water after reflow.
ORH1IPC J-STD-004 flux classification: organic acid, high activity, water-soluble. Classification for Indium 6.4R (not included in this guide).
Halogen-FreeTested per EN14582 to IEC 61249-2-21 (<900 ppm Cl, <900 ppm Br, <1500 ppm total halogens).
3.2Water-wash flux for SAC305 lead-free alloys. Excellent wetting, print performance, and stencil life.
3.2HFHalogen-free version of the 3.2 WS flux for SAC305. Verified halogen-free per EN14582 / IEC 61249-2-21. Available T3 and T4.
6.3Water-wash flux compatible with Sn63/Pb37 (and Pb-free alloys). Wide reflow window, excellent wetting, outstanding slump resistance, low voiding.
6.6HFWater-wash, halogen-free. Superior wetting to a variety of surface finishes; best voiding performance. Compatible with both SAC305 and Sn63/Pb37. Available T3, T4 and T5 (T5 for SAC305 only).
8.9Indium's flagship NC lead-free flux. Excellent stencil print transfer efficiency; superior performance under high-temperature and long reflow processes. Available T3 (88.5% ML) and T4 (88.25% ML).
8.9EExtended-performance NC lead-free paste for SAC305. Improved print transfer and oxidation resistance. Available T3 and T4.
8.9HFNC + halogen-free (EN14582). Available T3 and T4, for both SAC305 and Sn63/Pb37. SAC305: halogen-free per IEC 61249-2-21; one of Indium's lowest-voiding pastes; high ICT probe testability minimises false failures. Sn63/Pb37: clear, probe-testable residue.
8.9HF1NC halogen-free paste designed to pair with high-reliability alloys. Enables in-circuit probe testing. Available T3 and T4.
8.9HFANC halogen-free paste. High-speed printing (>100mm/s), eliminates hot/cold slump, advanced rheology for superior print transfer efficiency. Available T3 (88.5% ML) and T4 (88% ML).
10.1High-performance NC lead-free paste. Ultra-low voiding for QFN, BGA, and large ground pads. Eliminates graping and head-in-pillow defects. Type 4 powder only.
10.8HFNC halogen-free ultra-fine-pitch paste (Type 5 powder, 15–25 µm). Addresses non-wet opens (NWOs) on micro-BGA and 01005 components. Consult Indium applications engineering before qualifying.
SMQ92JNC leaded paste (Sn63/Pb37). Industry-leading solder paste with a soft residue that reduces false failures at ICT. Halogen-free.
SMQ92HModified version of NC-SMQ92J that maximizes print performance. Updated next-generation NC leaded paste for Sn63/Pb37. Halogen-free per indium.com product listing. Available T3 and T4.
RMA-155Rosin mildly activated (RMA) flux. No-clean, halogen-free. Low voiding, wide reflow window. Available for both SAC305 and Sn63/Pb37, Type 4 only.
5.7LTNo-clean flux for 57Bi/42Sn/1Ag low-temperature alloy. Peak reflow ~170°C. For temperature-sensitive assemblies, step soldering, or boards with existing SAC/SnPb joints. Not compatible with standard SAC or SnPb reflow profiles.
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