High-Temp Resistant Saturated Kraft Paper for PCB (140-150℃)
High-Temperature Resistant Saturated Kraft Paper for PCB is mainly produced with pine pulp under constant temperature and humidity conditions, using processes with urea and other components. Through resin impregnation, surface coating, and fiber modification, the paper achieves stable heat resistance. Unlike regular kraft paper, its production emphasizes environmental control and heat-resistant treatment. It can remain unchanged after 1000 hours at 150 ℃ and withstand 220–230 ℃ during PCB soldering and lamination. Tests such as aging in constant temperature chambers, tensile strength, tear resistance, and TGA analysis verify its durability. This material is widely applied in PCB soldering, copper-clad lamination, insulating liners, and high-temperature packaging.
High-Temp Saturated Kraft: Core Properties for PCB
PCB Soldering and Reflow
Reflow soldering (220–230 ℃) and wave soldering (up to 250 ℃) demand liners that resist heat, prevent deformation, and avoid sticking. High-temp kraft paper cushions the board, protects components on the back, and remains stable without cracking or contaminating solder joints.
PCB Lamination (CCL Production)
In multilayer PCB lamination (130–180 ℃, 800–1200 psi), kraft paper is used between copper foil, substrates, and steel plates. It provides dimensional stability, avoids shrinkage, prevents volatile impurities, and ensures uniform pressure transfer.
PCB Transport and Storage
For automotive or industrial PCBs, packaging must withstand 60–80 ℃ during container transport or hot factory storage. High-temp kraft paper maintains integrity without yellowing or releasing harmful substances, meeting RoHS standards.
It Matches PCB’s 140-150℃ Hot-Pressing Needs
Heat Stability: Withstands 220–230 ℃ short-term, maintains ≥90% tensile strength and ≥85% tear resistance after 1000 hours at 150 ℃.
Anti-Sticking Surface: Silicone-coated layer resists 280 ℃, prevents sticking to PCBs or steel plates, and avoids contamination.
Dimensional Accuracy: Shrinkage ≤0.1% at 180 ℃ and 1000 psi, thanks to 100% pine pulp and thermal setting.
No Impurity Release: High-purity pulp and RoHS-compliant additives prevent harmful emissions, protecting PCB dielectric performance.
Saturated High-Temp vs Regular Kraft: PCB Performance Differences
| Comparison | High-Temp Saturated Kraft Paper | Regular Kraft Paper | Key Difference |
|---|---|---|---|
| Process | Urea crosslinking + phenolic resin + silicone coating | Basic papermaking with light sizing | 3 heat-resistant steps added |
| 150 ℃ Aging | Strength retention ≥90% | ≤50%, brittle & yellowed | 1.8× stronger |
| Max Temp | 220–230 ℃ | 100–120 ℃ | 2.2× higher limit |
| Applications | PCB lamination, soldering, insulation | Packaging, printing | Only high-temp kraft works in electronics |
3 Technologies for Saturated Heat Resistance (PCB-Grade)
Resin Impregnation: Phenolic resin fills fiber gaps, forms a rigid network, and prevents shrinkage or oxidation.
Surface Coating: A 5–8 μm silicone layer boosts temperature limit to 280 ℃ and ensures smooth release.
Fiber Modification: Urea crosslinking and hot-air setting reinforce molecular bonds, securing long-term stability.
140-150℃ Testing: Methods for PCB Kraft Paper
Aging Test: 1000 hours at 150 ℃, verifying ≥85% strength retention.
High-Temp Tensile Test: At 220 ℃, kraft paper must reach ≥2.5 kN/m tensile strength.
TGA Analysis: Weight loss ≤3% under 230 ℃, ensuring no volatile impurities.
Anti-Sticking Test: No adhesion after 10 minutes at 230 ℃ and 0.5 MPa between steel plates.
PCB Applications: 140-150℃ Hot-Pressing & Lamination
Thermal Insulation in PCB High-Temperature Processes
Scenario: In PCB soldering and reflow welding (220–230 ℃), used as an insulating underlay beneath circuit boards. Core Function: Isolates high heat from the workstation, prevents bottom-side components from thermal damage, and avoids solder drops contaminating equipment. Advantages: No carbonization or sticking at 230 ℃, reusable 3–5 times, reducing consumable costs.
Pressing Underlay for Laminate & CCL
Scenario: In the hot-pressing process of HPL decorative laminates and CCL copper-clad laminates (130–180 ℃, 800–1200 psi), used between the steel plate and laminate. Core Function: Ensures uniform pressure transfer, prevents adhesion between board and steel plate at high temperatures, and protects the smoothness of the steel surface. Advantages: Excellent dimensional stability under heat (shrinkage ≤ 0.1%), no volatile impurities, ensuring bubble-free pressed products.
Industrial Thermal Insulation & Packaging
Suitable for high-temperature transport packaging of lithium batteries and electronic components, preventing performance degradation caused by external heat. Used as insulation wrapping for high-temperature pipelines in factories, helping reduce ambient temperature.
The Extreme Heat Tolerance of High-Temperature Resistant Kraft Paper
It lives up to its name by offering remarkable heat tolerance. Manufacturers specially design this material to withstand exposure to high temperatures that destroy regular paper. Companies treat the wood pulp with chemicals that increase heat resistance. As a result, it maintains its integrity even when directly exposed to heat sources.
The high heat tolerance makes it ideal for many industrial applications. Manufacturers frequently select the paper for use as insulation in extreme temperature environments. The material also suits applications like fire-resistant packaging, oven liners, and wrapping hot processed foods. It provides a durable paper barrier against damage from heat exposure during production processes.
While specially formulated to resist high temperatures, it retains the natural look of untreated kraft paper. It provides a moisture barrier similar to traditional kraft paper too. The specialized paper comes at an affordable price compared to other heat-resistant papers. Companies appreciate the material’s combination of special heat tolerance, kraft paper’s versatility, and cost effectiveness. When looking for a heat-resistant paper that protects against extreme temperatures, High-Temperature Resistant Kraft Paper is an excellent option.
Unleashing the Power of High-Temperature Resistant Kraft Paper
Unyielding against extreme heat, high-temperature resistant kraft paper excels in various industrial applications. Crafted with precision, this specialized paper maintains its strength and integrity, ensuring optimal performance. Its unique composition of treated cellulose fibers enables it to withstand intense temperatures while preserving structural integrity.
With exceptional thermal stability, this paper provides reliable thermal insulation and protection in automotive, aerospace, and electrical applications. It acts as a robust barrier, shielding delicate components from the blistering heat generated during manufacturing processes. This ensures smooth operations and maximum efficiency.
In addition to its heat resistance, high-temperature resistant kraft paper offers outstanding dimensional stability. Even under prolonged exposure to extreme temperatures, it remains unchanged, providing consistent performance and durability.
Manufacturers subject high-temperature resistant kraft paper to rigorous testing to guarantee top-notch quality. These assessments evaluate heat resistance, flame spread, and thermal conductivity. Meeting industry requirements, this paper instills confidence and reliability in demanding environments.
Furthermore, this kraft paper upholds environmental sustainability. Made from renewable resources and biodegradable materials, it exemplifies eco-consciousness while delivering unparalleled performance.
In summary, high-temperature resistant kraft paper proves its incredible capabilities in defying extreme heat conditions. Its thermal stability, dimensional durability, and environmental consciousness make it an indispensable tool in high-temperature environments. This remarkable paper safeguards critical components, ensuring their safety, longevity, and optimized industrial operations.
The Extreme Thermal Endurance of High-Temperature Resistant Kraft Paper
High-temperature resistant kraft paper is specially treated to withstand temperatures over 230°F without degrading, making it ideal for insulation, fire barrier and high-temperature filtration applications.
Practice Areas
Electrical Components
An insulating material in electrical components such as motors, generators, and transformers. The paper provides a strong insulation barrier that can withstand high temperatures.
Insulation Material
it can resist heat generated by industrial equipment
Food Packaging
wrap and package food products that require heat treatment during processing and transit
Art Industry
A popular choice for artists as it can be used for the creation of sculptures and structural designs that require high-temperature resistance.
High-temperature resistant Kraft paper
High-temperature resistant Kraft paper is a type of Kraft paper that has been specifically engineered to resist high temperatures and remain strong and durable in high-temperature applications. This paper is commonly made from natural unbleached wood pulp, which is then treated with heat-resistant chemical agents to enhance its thermal resistance properties.