Overview
Low-temperature solder paste is a specialized material used in electronics manufacturing where conventional soldering temperatures risk damaging components. It consists of powdered solder alloy (commonly Sn-Bi or Sn-In based) suspended in flux. Unlike standard pastes melting at 220°C+, these formulations liquefy between 138-183°C, reducing thermal stress on substrates. The technology gained prominence with the miniaturization of electronics and proliferation of temperature-sensitive materials like flexible PCBs and plastic connectors.
Physical and Chemical Properties
These pastes exhibit lower viscosity than standard formulations to accommodate delicate dispensing. Their flux systems are optimized for activity at reduced temperatures, often incorporating carboxylic acids or amine-based activators. Alloy compositions vary: Sn42Bi58 (melting point 138°C) is common for general applications, while Sn51In49 (120°C) serves ultra-sensitive assemblies. Lead-free variants comply with RoHS directives. The pastes maintain stable rheology for 4-8 hours at room temperature before requiring refrigeration.
Main Applications
Primary use cases include LED module assembly where high heat discolors phosphor coatings, and step soldering of multi-layer boards requiring sequential reflows. Medical electronics favor them for polymer component compatibility. Emerging applications encompass flexible hybrid electronics (FHE) on PET substrates, and repairs on vintage electronics with heat-vulnerable components. Some automotive sensors employ low-temp pastes for aluminum-to-copper bonding where thermal expansion mismatch is critical.
Safety and Storage
Store unopened containers at 5-10°C with desiccant to prevent moisture absorption and oxidation. Post-thawing, use within 12 months; repeated temperature cycling degrades performance. Workplace precautions include local exhaust ventilation due to potential fume emission during reflow. Wash hands after handling—some fluxes contain skin irritants. Dispose of waste per local regulations, particularly for lead-containing variants.
B2B Procurement Guide
Specify alloy composition, flux type (ROL0/ROL1 for low residue), and particle size (Type 3-5 for fine-pitch components). Request viscosity data at your application temperature (typically 150-300 kcps). Bulk buyers should validate batch-to-batch consistency through wetting balance tests. Consider pre-baked samples for high-volume production to assess performance after storage. For automated dispensing, verify the paste's slump resistance and tack time match your equipment parameters.
Related Manufacturers
- 主营：[]
- 主营：[]
- 主营：锡膏、锡渣回收、锡回收、锡条回收
- 主营：焊接印刷、无铅焊锡膏、助焊剂、导热介质
- 主营：防腐漆、三防剂、锡废料、焊锡膏、防潮油、清洁剂、焊锡丝、锡焊条、清洗剂、剥离剂、保护油、去除剂、铝合金、导热膏、三防漆、助焊剂、除油剂、焊锡条、散热膏、无铅锡线、电动玩具、电子元件、三防涂料、绝缘硅脂、镀锡支架
- 主营：固晶锡膏、MiniLED锡膏、mini固晶锡膏、系统级SIP封装焊锡膏、中温锡膏、倒装固晶锡膏、无铅高温锡膏、miniled锡膏、Mini锡膏、激光锡膏、高温高铅锡膏、倒装锡膏、激光焊接锡膏、水溶性锡膏、系统级封装锡膏、COB锡膏、二次回流锡膏、光通讯锡膏、8号粉锡膏、光模块锡膏、6号粉锡膏、7号粉锡膏、散热器锡膏、水溶性助焊剂、水溶性助焊膏
- 主营：焊锡线、热压焊、焊锡环、固晶锡膏、回流锡膏、焊接锡膏、环保锡膏、激光锡膏、激光焊锡膏、环氧胶粘剂、水基清洗剂
- 主营：电子电路板、SMIC锡线、SMIC锡条、低温锡膏、无铅锡膏、贴片焊接材料、贴片焊接耗材、电子焊接锡浆、稳定免清洗锡膏、田村锡膏、SMIC锡膏、KOKI锡膏、阿尔法锡膏、环保锡膏、日本田村焊锡膏、千住无铅锡膏、弘辉无铅锡膏、KOKI锡线、Alpha助焊膏、助焊膏、阿尔法助焊膏、阿尔法锡线、阿尔法锡条、SMIC千住锡条、Alpha工业锡线
- 主营：润膜胶、导热硅胶、环保水基型清洗剂、激光焊接锡膏、固晶锡膏、水洗型锡膏、铟锡合金锡膏、阿尔法射线锡膏、点涂锡膏、喷射锡膏、硅咪划线锡膏、低温高强度锡膏、高温高铅锡膏、二次回流锡膏、低温锡线、松香型锡膏、阿尔法锡膏、千住锡膏、甲酸锡膏、UV胶、硅酮胶、瞬间胶、散热膏
- 主营：焊锡条、焊锡丝、无铅锡锭、锡膏、免洗锡线
- 主营：废锡灰、锡焊条、锡箔纸、锡膏回收、锡箔灰、锡制品、今日锡、公司四、无铅锡、焊锡线、锡合金、焊锡丝、焊锡一、焊锡条、灰锡丝、氯化锡、锡废品、涂锡带、0307锡渣、锡制茶漏、业收购锡、锡业焊锡、兴鸿泰锡、特级焊锡、收购锡渣
- 主营：锡膏、锡条、锡丝、废锡回收
- 主营：无铅锡膏、有铅锡膏、高温锡膏、SMT锡膏、锡膏订制、水洗锡膏、激光锡膏、户外屏锡膏、中温锡膏、低温锡膏、LED锡膏、QFN锡膏、高活性锡膏
- 主营：led锡膏、焊锡膏、smt锡膏、snbi锡膏、snsb锡膏、固晶锡膏、高温锡膏、锡膏用法、针筒锡膏、中温锡膏、锡膏定制、焊镍锡膏、陶瓷锡膏、焊金锡膏、锡膏环保、洗板水、清洗剂、科技点涂
- 主营：锡丝、无铅锡线、环保锡丝、中温锡膏、环保锡条、无铅焊锡丝、无铅焊锡条
- 主营：中温锡膏、有铅锡膏、低温锡膏、高温锡膏、环保锡膏、有铅锡线、有铅锡条、环保焊锡浆
- 主营：gc10锡膏