Instructions for Use
DOC-IFU-SAC305-T4-EN · Rev. 1 · 2026 · SKU TSP-SAC305-T4-15G
SAC305 Solder Paste · Type 4
Sn96.5 / Ag3.0 / Cu0.5 · 15g Syringe
Lead-Free
No-Clean
Type 4 · 20–38µm
RoHS
ALLOY
SAC305
MELTING
217-220°C
POWDER
Type 4
METAL LOAD
~88.5%
1
Applications
PCB assembly / SMT
Standard pads / general SMD
Board repair & rework
IC / SMD soldering
Consumer electronics
Stencil printing
2
Specifications
Alloy compositionSn96.5 / Ag3.0 / Cu0.5
Solidus / Liquidus217°C / 220°C
Powder type / sizeType 4 / 20–38µm
Flux typeNo-Clean · ROL0
Metal content~88.5% by weight
Halide-free / RoHSYes / Compliant
Net weight15g (0.53 oz) syringe
Typical values — confirm against lot CoA before production.
3
Reflow Profile
SAC305 Recommended Reflow Profile
Liquidus 220°CPeak 245°C25150220°CPreheatSoakReflowCooling→ Time
Preheat
25-150°C
1-2°C/s ramp
Soak
150-200°C
60-120s
Reflow
235-250°C
Peak: 245°C
Cooling
<4°C/s
Natural
Time above liquidus (>220°C): 45-90 s. Do not exceed 260°C peak. Cool naturally — avoid forced air; do not move the board until joints have fully solidified.
6
Troubleshooting
Paste hard to dispense
Paste is too cold. Let the syringe sit at room temperature (20-25°C) for 30-60 min before use. Never heat the syringe.
Solder balls or bridging after reflow
Too much paste applied. Reduce volume, keep pads clean and dry, and verify peak temperature is within range.
Poor wetting / cold joints
Extend soak time or raise peak temperature slightly; ensure pads are free of oxidation.
Paste drying at the needle tip
Clear with a toothpick or replace the tip. Re-cap immediately after every use.
4
Directions for Use
1
Warm the syringe
Remove from the refrigerator and let it reach room temperature (20-25°C) for at least 4 hours before use. Never microwave or heat directly.
Cold paste condenses, spatters & balls up
2
Prepare the workspace & pads
Ensure good ventilation; wear nitrile gloves and safety glasses. Clean PCB pads with 99% isopropyl alcohol (IPA) and let dry completely.
3
Fit the dispensing tip
Screw the tip onto the syringe outlet. Use 18G-20G tips for standard pads; 22G for denser pads.
4
Apply paste to pads
Apply steady, even pressure to deposit a small amount of paste directly onto each pad — just enough to cover it. Avoid bridging between adjacent pads.
Less is more — start small
5
Place components
Place components with tweezers or a vacuum pen. The paste's tack holds them in position before reflow.
6
Reflow & cool
Use a reflow oven or hot-air station per the profile above. Let assemblies cool naturally; do not move the board before joints fully solidify.
7
Inspect joints
Good joints are shiny with a concave fillet and full wetting. Cold joints look dull or grainy. No-clean residue is non-conductive and non-corrosive and may be left in place.
5
Storage
STORE AT
2-10°C
Do not freeze
SHELF LIFE
6 mo
From mfg. date
HUMIDITY
35-70%
Sealed & dry
After use: remove the tip, re-cap tightly and store upright in the refrigerator. Mark the opening date on the syringe; best used within 2 weeks of opening. Do not use past the labeled expiry (EXP).
7
SAFETY INFORMATION
Warning
WARNING
GHS07
Hazard statements — H317 May cause an allergic skin reaction (rosin / colophony).
Precautionary statements — P261 Avoid breathing dust or fumes. P272 Contaminated work clothing must not be allowed out of the workplace. P280 Wear protective gloves. P302+P352 IF ON SKIN: Wash with plenty of water. P333+P313 If skin irritation or rash occurs: Get medical advice or attention. P362+P364 Take off contaminated clothing and wash it before reuse. P501 Dispose of contents and container in accordance with local, regional and national regulations.
KEEP OUT OF REACH OF CHILDREN.
DO NOT
✗ Swallow, or allow contact with eyes — rinse with water for at least 15 minutes.
✗ Discard with household waste — follow local hazardous-waste rules.
✗ Use near open flame, or heat the syringe directly.
FIRST AID — Skin: wash with soap and water. Eyes: rinse with water for 15 minutes. Inhaled: move to fresh air. Swallowed: rinse mouth, do NOT induce vomiting. If symptoms persist, get medical advice. Poison Control 1-800-222-1222 (USA).
STORAGE — Refrigerate 2–10 °C (36–50 °F). Do not freeze. Bring the sealed syringe to room temperature for at least 4 h before opening. Shelf life 6 months unopened; use within 3 weeks after opening.
For professional and hobbyist electronics assembly and repair. Not for human consumption or food-contact use. Transport classification: see SDS Section 14.
DISTRIBUTED BY
LINGSKO LLC
CASPER WY 82609 USA
Full Safety Data Sheet
tinvoa.co/sds/sac305
DOC-IFU-SAC305-T4-EN · Rev. 1 · 2026 · Safety Data Sheet (SDS): tinvoa.co/sds
www.tinvoa.co
[email protected]