Soft Felt

Carbon & Graphite Soft Felt for High-Temperature Thermal Insulation

Semicera's carbon and graphite soft felt is engineered for the extreme thermal environments found in vacuum furnaces, crystal growth systems, and high-temperature industrial processes. Unlike general-purpose insulation, our soft felt is manufactured under strict purity control to meet the demands of semiconductor, photovoltaic, and advanced materials manufacturing — where trace contamination or dimensional instability can compromise an entire production run.

Soft felt sits alongside our Rigid (Hard) Felt and C/C Composite product lines, giving customers a full range of carbon-based thermal insulation solutions from the same purity-controlled supply chain. Where rigid felt provides structural support, soft felt offers flexibility and easy formability for wrapping, lining, and sealing irregular hot-zone geometries — making the two product types complementary rather than interchangeable.

Key Properties

Exact specifications vary by grade — see individual product pages or contact our technical team for a full datasheet.

Across our soft felt range, customers consistently look for:

• ● Outstanding thermal stability across repeated heating/cooling cycles
• ● High mechanical strength for handling and installation without tearing
• ● Good electrical and thermal conductivity where required by the process
• ● Excellent resistance to thermal shock and corrosion
• ● High material purity, with GDMS reports available on request
• ● Uniform temperature profile to reduce hot-spot-driven insulation failure

Available Grades

Semicera's soft felt is offered in multiple purity and density grades to match different process temperatures and budget requirements — from standard-purity felt for general vacuum/inert-gas furnace insulation, up to ultra-high-purity grades for semiconductor crystal growth hot zones where particle and metallic contamination must be tightly controlled. Our technical team can help match the right grade to your furnace type and operating temperature.

Fields of Application

• ● Vacuum furnaces
• ● Inert gas furnaces
• ● Heat treatment (hardening, carbonization, brazing, etc.)
• ● Carbon fiber production
• ● Hard metal (cemented carbide) production
• ● Sintering applications
• ● Technical ceramic production
• ● CVD/PVD coating equipment
• ● Semiconductor and crystal growth hot-zone insulation

Why Source Soft Felt from Semicera

• ● Purity control built for semiconductor supply chains — the same quality system we use for our SiC and TaC coated components extends to our carbon fiber felt products, not a separate lower-tier process.
• ● Multiple forms, one supplier — rolls, cut-to-size parts, and pre-rolled felt tubes, so you're not sourcing insulation from one vendor and structural felt from another.
• ● Custom fabrication — width, length, density, and purity grade can be tailored to your specific furnace or hot-zone design; ODM/OEM projects welcome.
• ● Global logistics experience — established export packaging and documentation workflows for customers across Asia, Europe, and the Americas.

Browse our current soft felt product range below, or contact our technical team with your furnace specifications for a tailored recommendation and quotation.