Mica Insulation Foils for Induction Furnaces
NEWFORM COMBI G
Newform Combi G is a flexible, cold-formable mica roll laminate designed for high-performance thermal and dielectric insulation in coreless induction furnaces, offering a durable, asbestos-free barrier with a slip-plane effect between coil grout and refractory linings. Newform Combi G performs as ...
Slip-Plane | Glass fiber reinforced mica with high tensile strength
Safety-Layer | protecting the coil against refractory movements
Separating-Layer | gas diffusion barrier
Insulation-Layer | electrical and thermal protection
Protection Layer | compensates bath movements (mainly vertical)
KEY TECHNICAL DATA FOR COMBI G
Technical Data
1.100°C
Temperature Limit
Combi G has a temperature limit of 1100°C
2,4mm
Thickness
Combi G has a total thickness of 2.4mm ±0,05
0,1W/mK
Thermal Conductivity (400 °C)
Combi G has a thermal conductivity of 0.1W/mK at 400°C
25KV/mm
Dielectric Strenght
Combi G provides dielectric strength of 25kV/mm (IEC 243 at 20°C)
KA 3c
Tracking Resistance
Combi G is rated KA 3c for tracking resistance (VDE 0303/1)
1m x 25m
Availability
Combi G is available in rolls of 1.0m × 25.0m
Why Use A Mica Slip Plane
Application of a Mica Slip Plane
Newform Combi G is a flexible, cold-formable mica foil, glass fiber reinforced for enhanced mechanical strength, silicon binded with CaSi-Paper Layer (2mm) designed for use in coreless induction coil furnaces. It is applied as a slip-plane between compacted refractory material and the coil grout. It is used in larger furnaces (>2ton).
Combi G is composed of phlogopite mica, reinforced with a glass fiber matrix, and is asbestos-free, non-toxic and biodegradable binded with a CaSi-Paper. The material is suitable for operating temperatures up to 1,100°C, whereas at its position max 300°C are expected. Combi G delivers stable performance under thermal and mechanical stress.
Combi G comes in rolls; 25m long, 1m wide and a thickness of 2,4mm ± 0.05mm. Its technical characteristics include thermal conductivity of 0.5W/mK at 400°C, dielectric strength of 25kV/mm (IEC 243), and tracking resistance KA 3c (VDE 0303/1).
Installation is straightforward: the foil is cut to hight, and wrapped on top around the coil grout. It is fixed in place (top only required) using halogen-free glue or scotch tape. The material’s flexibility and tear resistance make it ideal for curved surfaces and tight furnace geometries.
Combi G offers multiple functional benefits: it acts mainly as a slip plane during removal of the used refractory material. It further serves as a gas diffusion barrier and is preferably used in furnaces larger than 2ton.
Combi G • Four-in-One Protection
One Layer, Multiple Functions
Slip-Plane Effect
The mica layer acts as a slip plane between the coil grout and refractory. It allows controlled movement during thermal cycling and ensures clean separation during refractory removal.
Safety-Layer
Combi G forms a mechanical barrier that protects the induction coil and grout from direct contact with sintered refractory reducing wear and structural stress. The CaSi-Paper layer compensates for unevenness in the wall.
Separating-Layer
The dense, layered structure of Combi G acts as a gas diffusion barrier, limiting the penetration of process vapors and fine particles into the wall.
Insulation-Layer
With high dielectric strength and low thermal conductivity, Combi G provides effective electrical and thermal insulation in high-temperature furnace environments.
STEP 1
Surface Cleaning & Preparation
Scratch of residual sticking materials from the coil grout. The flexible mica roll laminate adapts to small surface irregularities - no preheating, grinding, or special surface treatment required.
STEP 2
Cutting & Positioning
Cut Combi G to furnace height with slight (10-20cm) overlapping for proper fixing at top. Mount the sheet vertically on the coil grout. The mica side of the biodegradable insulation must face outward where the (later sintered) ramming mass will be.
STEP 3
Secure Fixing
Fix the top edge using watery, halogen-free glue or scotch tape. Ensure full surface contact to prevent shifting during refractory installation.
STEP 4
Refractory Installation
Install and compact the ramming mass between placed metal crucible and the mica insulation along the coil grout. The mica slip-plane effect allows clean separation of refractory during installation protects the coil grout, and extends furnace service life.
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