PM35 porous breathable steel is an advanced porous metallic material manufactured through precision powder metallurgy technology. Utilizing fine stainless steel powder as raw material, it forms a unique three-dimensional interconnected pore structure via high-temperature sintering processes.

This innovative material perfectly combines metallic mechanical properties with uniform permeability characteristics, demonstrating irreplaceable value in solving gas trapping issues in injection molding.

As a functional mold material, porous steel maintains the mechanical strength and machinability of conventional tool steels while offering controlled gas permeability. The intricate network of micron-sized pores allows gas passage while blocking molten plastic, achieving organic integration of venting functionality and structural integrity.

Products Specifications

Material	PM35 Steel
Porosity	25-30%
Density	5.8-6.3 g/cm³
Linear Expansion Coefficient (20-150°C)	6.67-6.94 in./in·F
Thermal Conductivity (Room Temperature)	16.93-19.35 BTU/ft·hr·F
Flexural Strength	70-75 kgf/mm²
Tensile Strength	45-50 kgf/mm
Hardness (HV)	350-400 (35-40 HRC)
Dimensions	Customizable

Products Features

Excellent Comprehensive Mechanical Properties with Lightweight Characteristics

PM35 porous steel maintains exceptional specific strength and rigidity while preserving its porous structure. The unique three-dimensional network creates uniformly distributed reinforcement points within the material, enabling weight reduction while meeting demanding mechanical requirements for mold applications.

Precisely Controlled Permeability and Filtration Characteristics

Through advanced powder size distribution and sintering process control, PM35 achieves precise porosity and pore size distribution. The interconnected internal pores form efficient micro-gas flow channels that rapidly balance pressure differences between the mold cavity and atmosphere while effectively preventing plastic melt penetration.

Outstanding Thermal Conductivity and Temperature Uniformity

Despite its porous structure, PM35 maintains excellent thermal conduction performance. The continuous metallic framework within the material ensures efficient heat transfer pathways, while the porous structure increases surface area enhancing heat dissipation effectiveness. This helps maintain uniform mold temperature distribution and reduces product defects caused by localized overheating.

Superior Machining Compatibility and Service Life

PM35 is fully compatible with traditional mold machining processes including cutting, grinding, and EDM without requiring special equipment or techniques. The high-strength matrix and uniform pore distribution prevent edge chipping and pore clogging during processing. With proper heat and surface treatments, PM35 achieves service life comparable to conventional tool steels, meeting high-volume production requirements.

applications

1. Precision Injection Mold Venting Systems

Widely used in injection molds for automotive lighting and optical lenses, where high-quality surface finish is critical, particularly in last-fill area venting designs.

2. Large Complex Structural Component Molding

Essential for manufacturing large plastic parts such as automotive bumpers and appliance housings, solving end-of-fill venting challenges caused by high flow-length ratios.

3. Micro-Feature and Thin-Wall Component Molding

Provides effective venting solutions for precision parts with delicate features or thin-wall structures. The fine pore structure prevents flash formation common with traditional venting channels while ensuring complete gas evacuation from micro-cavities.

4. High-Performance Engineering Plastic Processing

Effectively removes decomposition gases when processing glass-filled polymers and high-temperature engineering plastics, reducing corrosive effects on mold surfaces.

5. Mold Cooling System Optimization

The porous structure enables innovative cooling system designs through permeation principles, achieving uniform coolant distribution and improved cooling efficiency for complex cooling channel applications.

6. Special Molding Process Support

Plays a crucial role in gas-assisted injection molding and microcellular foaming processes, providing precise gas management capabilities for advanced molding technologies.