Solder Paste – In modern electronics manufacturing, precision and reliability are essential for producing high-quality printed circuit boards (PCBs). One of the most important materials used in Surface Mount Technology (SMT) assembly is solder paste.
It plays a critical role in creating durable electrical and mechanical connections between electronic components and the PCB.
Whether you’re manufacturing consumer electronics, automotive systems, industrial equipment, or medical devices, choosing the right solder paste directly impacts product quality, assembly efficiency, and long-term reliability.
At Hiflosolders, we manufacture premium-quality solder paste solutions engineered to deliver consistent printing performance, excellent wetting characteristics, and reliable solder joints for various electronics manufacturing applications.
What is Solder Paste?
Solder paste is a carefully engineered mixture of microscopic metal alloy powder and specially formulated flux. It is applied to PCB pads before electronic components are placed on the board.
During the reflow soldering process, the paste melts at a controlled temperature, allowing the metal particles to fuse with the component leads and PCB pads. As the solder cools, it forms a strong intermetallic bond that provides both electrical conductivity and mechanical strength.
This process ensures secure connections capable of withstanding thermal cycling, vibration, and long-term operational stress.
How Does Solder Paste Work?
The soldering process involves several stages:
1. Precise Printing
Solder paste is deposited onto PCB pads using a stencil printing process, ensuring accurate placement.
2. Component Placement
Surface-mount components are positioned directly onto the printed solder paste.
3. Reflow Heating
The PCB passes through a controlled reflow oven where the solder paste melts uniformly.
4. Bond Formation
Molten solder forms strong metallurgical connections between the PCB and electronic components.
5. Cooling
As the solder solidifies, durable electrical and mechanical joints are created.
Key Features of Hiflosolders Solder Paste
Hiflosolders develops solder paste formulations that are optimized for today’s demanding electronics manufacturing environments.
Excellent Bond Strength
Our solder paste creates reliable intermetallic bonds that maintain mechanical integrity even under high operating temperatures and repeated thermal cycles.
Superior Wetting Performance
Excellent wetting properties allow the solder to spread evenly across solder pads, reducing defects and improving joint reliability.
Long Shelf Life
Unlike conventional adhesives that lose performance over time, Hiflosolders solder paste maintains its stability and printing consistency when stored under recommended conditions.
Flux Cleaning Action
The integrated flux removes oxidation, contaminants, and surface impurities during soldering, allowing cleaner and stronger solder joints.
Consistent Printing Performance
Optimized viscosity ensures smooth stencil printing with reduced bridging, slumping, and insufficient deposits.
Types of Solder Paste Available
Different electronics applications require different solder powder sizes for optimal performance.
Type 4 Solder Paste
Type 4 solder paste is commonly used for medium-pitch PCB assemblies and provides excellent printing resolution for most SMT manufacturing applications.
Best suited for:
- Consumer electronics
- Industrial electronics
- Communication equipment
- Automotive control boards
Type 5 Solder Paste
Type 5 solder paste contains finer alloy particles, making it ideal for higher-density PCB layouts and smaller components.
Suitable for:
- Fine-pitch components
- Compact electronic devices
- Advanced SMT assemblies
Specialized Micro-Pitch Solder Paste Solutions
As electronic devices continue to shrink in size, manufacturers require solder paste capable of handling extremely fine-pitch components.
Hiflosolders offers specialized micro-pitch solder paste solutions that deliver:
- High printing accuracy
- Reduced solder bridging
- Improved transfer efficiency
- Consistent solder joint formation
- Enhanced reliability for miniature electronic assemblies
What is Tacky Cream?
Tacky Cream, also known as Sticky Flux, is a high-viscosity flux material designed to remain exactly where it is applied during soldering.
Unlike liquid flux, Tacky Cream has a thick gel-like consistency that prevents dripping or flowing away from the work area.
Benefits of Tacky Cream
- Excellent adhesion
- Better control during soldering
- Reduced movement during heating
- Improved flux retention
- Cleaner solder joints
Applications of Tacky Cream
Tacky Cream is especially useful for challenging soldering applications, including:
- BGA (Ball Grid Array) rework
- Vertical solder joints
- Overhead soldering
- Precision electronic repairs
- Fine-pitch component assembly
Its strong adhesive properties help maintain component positioning throughout the soldering process.
Advantages of Using Hiflosolders Solder Paste
Choosing the right solder paste offers several manufacturing benefits:
- Consistent solder joint quality
- High electrical conductivity
- Strong mechanical bonding
- Excellent thermal reliability
- Long storage stability
- Reduced oxidation during soldering
- Minimal soldering defects
- Smooth stencil printing
- Improved manufacturing yield
- Suitable for automated SMT production
Industries That Use Solder Paste
Hiflosolders solder paste is trusted across numerous industries, including:
- Consumer Electronics
- Automotive Electronics
- Medical Devices
- Industrial Automation
- Telecommunications
- Aerospace Electronics
- LED Manufacturing
- Power Electronics
- IoT Devices
- Smart Home Products
Storage Tips for Solder Paste
Proper storage helps maintain solder paste performance and extends its usable life.
Recommended storage practices include:
- Store under recommended refrigeration conditions.
- Keep containers tightly sealed when not in use.
- Allow the paste to reach room temperature before opening.
- Avoid contamination with dust or moisture.
- Follow the manufacturer’s shelf-life recommendations.
Why Choose Hiflosolders?
Hiflosolders is committed to delivering premium soldering materials that meet the evolving needs of the electronics manufacturing industry.
Our solder paste products are designed to provide:
- Reliable solder joint performance
- Consistent printing characteristics
- Advanced flux technology
- Excellent wetting capability
- Long shelf life
- Solutions for Type 4, Type 5, Type 6, and micro-pitch applications
- Technical expertise and quality assurance
Whether you’re producing high-volume SMT assemblies or precision electronic components, Hiflosolders provides solder paste solutions that help maximize productivity and product reliability.
Solder Paste with Lead
| Product | Correct Silver % | Notes |
| Sn63/Pb37 Leaded Solder Paste | 0% Silver | Standard alloy is Tin 63% / Lead 37%. No silver in normal Sn63/Pb37. |
| SAC305 Lead-Free Solder Paste | 3.0% Silver | SAC305 = Sn96.5 / Ag3.0 / Cu0.5. |
| SAC0307 Lead-Free Solder Paste | 0.3% Silver | SAC0307 = Sn balance / Ag0.3 / Cu0.7. |
| SnBiAg0.4 Low-Temperature Paste | 0.4% Silver | Common low-temperature lead-free alloy with bismuth and 0.4% silver. |
1. Sn63/Pb37 Leaded Solder Paste
Product Description
Sn63/Pb37 Leaded Solder Paste is a high-performance tin-lead solder paste designed for SMT PCB assembly, reflow soldering, repair, and rework applications. The eutectic alloy composition of 63% Tin and 37% Lead provides smooth melting, excellent wetting, and reliable solder joint formation.
This solder paste is suitable for electronics manufacturing where leaded soldering is permitted. It offers stable printing performance, good solder spread, and consistent solder joint appearance for industrial and electronic PCB assembly.
Specification Notes
| Specification | Details |
| Product Name | Sn63/Pb37 Leaded Solder Paste |
| Alloy Composition | Sn63 / Pb37 |
| Tin Content | 63% |
| Lead Content | 37% |
| Silver Content | 0% |
| Alloy Type | Leaded |
| Powder Type | Type 3 / Type 4 depending on requirement |
| Flux Type | No-Clean / RMA depending on grade |
| Application | SMT, PCB assembly, reflow soldering, repair and rework |
Key Features
- Excellent wetting and solderability
- Smooth and shiny solder joint finish
- Stable melting performance
- Suitable for leaded SMT process
- Good printing and stencil release
- Suitable for PCB repair and rework
- Reliable joint strength for electronics assembly
Applications
- Leaded SMT assembly
- PCB reflow soldering
- Electronics repair and rework
- Industrial electronics manufacturing
- Legacy PCB production
- Prototype PCB assembly
2. SAC305 Lead-Free Solder Paste
Product Description
SAC305 Lead-Free Solder Paste is a premium tin-silver-copper solder paste designed for lead-free SMT assembly and reflow soldering. It contains 96.5% Tin, 3.0% Silver, and 0.5% Copper, making it one of the most commonly used lead-free solder paste alloys in electronics manufacturing.
SAC305 solder paste provides excellent wetting, good solder joint strength, and reliable performance for high-quality PCB assembly. It is suitable for automotive electronics, communication equipment, consumer electronics, industrial control boards, and EMS production.
Specification Notes
| Specification | Details |
| Product Name | SAC305 Lead-Free Solder Paste |
| Alloy Composition | Sn96.5 / Ag3.0 / Cu0.5 |
| Tin Content | 96.5% |
| Silver Content | 3.0% |
| Copper Content | 0.5% |
| Alloy Type | Lead-Free |
| Powder Type | Type 4 / Type 5 |
| Flux Type | No-Clean |
| Application | SMT printing, reflow soldering, fine-pitch PCB assembly |
Key Features
- Lead-free solder paste for RoHS-type applications
- 3.0% silver alloy for strong solder joint reliability
- Good wetting on PCB pads and component terminals
- Suitable for standard and fine-pitch SMT assembly
- Excellent printability and paste release
- Stable reflow performance
- Good solder joint strength and thermal reliability
Applications
- SMT PCB assembly
- Reflow soldering
- Fine-pitch electronics assembly
- Automotive electronics
- Communication systems
- Consumer electronics
- Industrial control PCB assembly
- Electronics manufacturing services
3. SAC0307 Lead-Free Solder Paste
Product Description
SAC0307 Lead-Free Solder Paste is a cost-effective tin-silver-copper solder paste designed for lead-free PCB assembly and SMT reflow soldering. It contains 0.3% Silver and 0.7% Copper, with tin as the balance composition.
Compared with SAC305, SAC0307 has lower silver content, helping reduce material cost while still providing reliable lead-free soldering performance. It is suitable for general electronics manufacturing, industrial PCB assembly, LED boards, consumer electronics, and high-volume SMT production.
Specification Notes
| Specification | Details |
| Product Name | SAC0307 Lead-Free Solder Paste |
| Alloy Composition | Sn balance / Ag0.3 / Cu0.7 |
| Silver Content | 0.3% |
| Copper Content | 0.7% |
| Tin Content | Balance |
| Alloy Type | Lead-Free |
| Powder Type | Type 4 |
| Flux Type | No-Clean |
| Application | SMT PCB assembly, reflow soldering, cost-effective lead-free production |
Key Features
- Lead-free solder paste with 0.3% silver
- Cost-effective alternative to SAC305
- Good solderability and wetting performance
- Suitable for standard SMT stencil printing
- Stable paste performance during production
- Supports reliable solder joint formation
- Suitable for high-volume PCB assembly
Applications
- SMT assembly
- PCB reflow soldering
- LED PCB assembly
- Consumer electronics
- Industrial electronics
- General lead-free soldering process
- Cost-sensitive electronics manufacturing
4. SnBiAg0.4 Type 4 Low-Temperature Lead-Free Solder Paste
Product Description
SnBiAg0.4 Type 4 Low-Temperature Lead-Free Solder Paste is designed for temperature-sensitive PCB assemblies where lower reflow temperature is required. This alloy contains 0.4% Silver and is commonly used with tin-bismuth-based solder systems.
The low-temperature reflow process helps reduce thermal stress on components, minimize PCB warpage, and protect delicate electronic parts. It is suitable for LED modules, display boards, camera modules, flexible PCBs, thin PCB materials, and consumer electronics assembly.
Specification Notes
| Specification | Details |
| Product Name | SnBiAg0.4 Type 4 Low-Temperature Solder Paste |
| Alloy Type | Lead-Free Low-Temperature |
| Alloy System | Tin / Bismuth / Silver |
| Silver Content | 0.4% |
| Powder Type | Type 4 |
| Flux Type | No-Clean |
| Main Benefit | Lower reflow temperature |
| Application | Heat-sensitive SMT assembly, LED, display, camera module, flexible PCB |
Key Features
- Lead-free low-temperature solder paste
- Contains 0.4% silver
- Suitable for heat-sensitive components
- Helps reduce PCB warpage
- Lower thermal stress during reflow
- Good printability and solderability
- Suitable for Type 4 SMT stencil printing
- Helps protect delicate components from high-temperature damage
Applications
- Low-temperature SMT reflow
- LED module assembly
- Display electronics
- Camera module assembly
- Flexible PCB assembly
- Thin PCB assembly
- Heat-sensitive electronic components
- Consumer electronics production
Read More: Solder Sticks & Bars , Solder Wires