Superwool® Felt & Unifelt | Prime · HT · XTRA
Superwool® Felt and Unifelt by Morgan Advanced Materials — thin, semi-rigid substrates for die-cutting, gaskets and expansion joints. Three chemistries: Prime, HT (1300°C), XTRA Unifelt.
Superwool® Felts are thin, semi-rigid high-temperature fiber substrates by Morgan Thermal Ceramics — designed for die-cut parts, gaskets and precision components. Three Superwool® chemistries are available in felt form: Prime Felt (EU), HT Felt (1300°C, widest density range) and XTRA Unifelt (binder-bonded board format, 6–50 mm). All are biosoluble and exonerated from classification as carcinogenic under Note Q of EU Regulation EC/1272/2008 (CLP).
- Chemistry / Variant
- Prime | HT (1300°C) | XTRA Unifelt
- Density (kg/m³)
- 64–288 (HT) | 96–160 (Prime)
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Die-Cuttable Format
Thin, semi-rigid and precisely die-cuttable — ideal for gaskets, expansion joints and precision parts in confined installation spaces.
Biosoluble
All Superwool® felts meet Note Q of EU Regulation EC/1272/2008 (CLP) — not classified as carcinogenic. No GHS warning labels required.
Three Chemistries
Prime Felt (EU), HT Felt (1300°C, density range 64–288 kg/m³) and XTRA Unifelt (binder-bonded, board format 1000×500 mm) cover different application profiles.
PRODUCT TYPE
Superwool® Felts are thin, semi-rigid substrates made from biosoluble high-temperature wool. Unlike flexible blanket roll goods, felts are designed for die-cutting and precision parts: gaskets, expansion joints, sleeves and custom-shaped components. The low thickness (from 6 mm) and defined rigidity enable clean cut edges during die-cutting and plotting. Superwool® XTRA Unifelt uses an organic binder (burnout at 180–200°C) and is supplied in board format 1000×500 mm.
MATERIAL
Alkaline earth silicate fibers (AES) form the basis for Prime and HT Felt: a mix of amorphous fibers based on SiO₂ and CaO/MgO. Superwool® XTRA Unifelt uses a proprietary Al₂O₃/SiO₂/K₂O/ZrO₂ formulation. All three chemistries are biosoluble — the fibers dissolve in the body and meet the criteria of Note Q (EC/1272/2008). Superwool® HT Felt has the highest silicon dioxide content of all Superwool® products at 70–80 % SiO₂.
Morgan Thermal Ceramics
Morgan Advanced Materials plc (Morgan Thermal Ceramics division) is one of the world's leading manufacturers of high-temperature insulation products. The patented Superwool® fiber technology has been developed over more than 20 years and provides biosoluble alternatives to conventional refractory ceramic fibers (RCF). Superwool® Felts and Unifelt complement the blanket range with thin, die-cuttable substrates for gasketing and precision applications.
CHEMISTRY COMPARISON: PRIME FELT · HT FELT · XTRA UNIFELT
Property Prime Felt HT Felt XTRA Unifelt Classification Temperature — 1300°C — Density (kg/m³) 96–160 64–288 — Fiber Chemistry CaO/SiO₂ (AES) SiO₂ 70–80 %, CaO+MgO 18–25 % Al₂O₃/SiO₂/K₂O/ZrO₂ Binder No No Yes (burnout 180–200°C) Format Felt roll Felt roll Board 1000×500 mm Thickness on request on request 6–50 mm Availability EU Global Global Biosoluble (Note Q) Yes Yes Yes Datasheet Code — FL.01 FL.10 Superwool® Plus has no felt variant — Morgan only offers this product form in the Prime, HT and XTRA chemistries.
TECHNICAL DETAILS
Chemical Analysis — HT Felt
SiO₂ 70.0 - 80.0 % CaO + MgO 18.0 - 25.0 % Chemical Analysis — XTRA Unifelt
Al₂O₃ 32.0 - 38.0 % SiO₂ 27.0 - 33.0 % K₂O 23.0 - 28.0 % ZrO₂ 5.0 - 9.0 % MgO 0.5 - 1.5 % Physical Properties — HT Felt
Color White Classification Temperature (°C) 1300 Density (kg/m³) 64–288 (4–18 pcf) Datasheet Code FL.01 CHARACTERISTICS
Superwool® Felts and Unifelt are thinner, semi-rigid alternatives to classic blanket roll goods. While blankets are used as roll stock for large-area insulation, felts are used where precision and dimensional stability are required: die-cut parts for furnace gaskets, expansion joints in kilns, insulation sleeves in confined spaces. Superwool® HT Felt offers the widest density range of all Superwool® felts at 64–288 kg/m³. XTRA Unifelt uses an organic binder for additional rigidity in the raw state — the binder burns out at 180–200°C, leaving the pure fiber structure.
APPLICATIONS
- Gaskets and expansion joints in furnaces, kilns and boilers
- Die-cut and plotted precision parts
- Thermal insulation in confined and thin installation spaces
- Electrical insulation backing
- Filtration media
- Investment casting wrapping
- Exonerated from classification as carcinogenic under Note Q of EU Regulation EC/1272/2008 (CLP)
Frequently Asked Questions (FAQ)
What is Superwool® Felt and how does it differ from Superwool® Blankets?
Superwool® Felt is a thin, semi-rigid substrate made from biosoluble high-temperature wool by Morgan Advanced Materials. While Superwool® Blankets are flexible roll goods used for large-area insulation, Felt is designed for die-cutting and precision parts — gaskets, expansion joints, sleeves and custom-shaped components. The lower thickness and higher rigidity enable clean cut edges.
Which Superwool® chemistries are available as Felt?
Morgan offers Felt in three chemistries: Prime Felt (AES, EU availability), HT Felt (AES with 1300°C classification, widest density range at 64–288 kg/m³) and XTRA Unifelt (Al₂O₃/SiO₂/K₂O/ZrO₂, binder-bonded board format). Superwool® Plus has no felt variant.
What is the difference between XTRA Unifelt and the other felts?
Superwool® XTRA Unifelt uses an organic binder that provides additional rigidity in the raw state. The binder burns out at 180–200°C, leaving the pure fiber structure. Unifelt is supplied in board format 1000×500 mm (thickness 6–50 mm), while Prime and HT Felt are available as felt rolls.
Is Superwool® HT Felt being discontinued?
No. Superwool® HT Felt remains actively available and is not being replaced by Prime Felt. HT Felt offers the widest density range of all Superwool® felts at 64–288 kg/m³ and a classification temperature of 1300°C. The HT chemistry (SiO₂ 70–80 %) differs fundamentally from the Prime chemistry.
What applications is Superwool® Felt suitable for?
Superwool® Felts are suitable for gaskets and expansion joints in furnaces, kilns and boilers, die-cut precision parts, thermal insulation in confined spaces, electrical insulation backing, filtration media and investment casting wrapping. All variants are biosoluble and exonerated from classification as carcinogenic under Note Q of EU Regulation EC/1272/2008 (CLP).
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Data Sheet Superwool® Prime Felt (EU)
Product properties, typical applications and availabilities.
Data Sheet Superwool® HT Felt
Product properties, typical applications and availabilities (Code FL.01).
Data Sheet Superwool® XTRA Unifelt
Product properties, typical applications and availabilities (Code FL.10).
Senn Group Information Catalog
Refractories, seals, foundry supplies, conveyor chains, compensators, plain bearings, lubricants, metal parts, and logistics/FTL
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Since 2001, KS Kneissl & Senn Technologie GmbH
has been producing insulation materials and seals for a wide range of applications up to a temperature range of 1600 °C. A diverse range of machinery (CNC 5-axis milling, plotting, punching, sewing, water jet cutting, vacuum forming, etc.) enables us to shape a wide variety of materials for you. The main materials include: glass fibers, aramid fibers, mineral fibers, biosoluble fibers, ceramic fibers, silicate fibers, vermiculite, calcium silicate, microporous materials, elastomers (rubber, silicone, silicone foam, etc.), etc.
The company has been ISO9001 certified since 2009, currently in accordance with the 2015 revision of the standard.
