What are transformer insulation materials?
Transformer insulation materials electrically and thermally separate windings, core structures, and conductive parts inside oil-immersed or dry-type transformers. Typical families include polyester and polyimide films, diamond dotted paper (DDP), pressboard laminates, tapes, sleevings, and Class F/H layered composites. Selecting the wrong thermal class or thickness increases the risk of thermal aging and premature failure.
Gala Elektrik (Gala Elektrik İzolasyon Malzemeleri Sanayi ve Ticaret Limited Şirketi) imports, exports, and supplies coil-winding and transformer insulation materials from Avcılar, Istanbul, and offers precision slitting to customer widths.
“As a company open to innovation … we strive to offer the best service through quality products, fair pricing, and on-time delivery.” — Adapted from Gala Elektrik About positioning
Five selection criteria for transformer insulation materials
- Thermal class (B / F / H) — Match continuous operating temperature. Gala presents Filmcutter laminated products in Class F and H.
- Dielectric strength & thickness — Align film/pressboard thickness with voltage and clearance geometry.
- Chemical / varnish compatibility — Impregnation resins must bond without damaging the dielectric.
- Format — Rolls, sheets, DDP, or prepreg must fit your process.
- Supply & converting — Local stock plus slitting reduces scrap and lead-time risk.
Material families commonly used
DDP and pressboard
Diamond dotted paper helps create bonded insulation structures under heat and pressure. Mica and PSP pressboard grades support structural insulation. Examples on site: DDP, Fish paper / flexible laminate.
Polyester and polyimide films
Polyester (PET) films are widely used in Class B contexts; Gala’s product page lists thicknesses from 0.012 to 0.350 mm. Polyimide (Kapton) films and tapes serve higher-temperature zones. See Polyester Film.
Filmcutter laminates and prepregs
Italian Filmcutter layered materials (NMN, DMD, DM, Polistrat, prepreg lines) support coil and transformer insulation stacks. Hub: Filmcutter Products.
Tapes and sleevings
Polyester tape, glass-fiber tape, Kapton tape, silicone/acrylic sleevings, and heat-shrink tubing complete terminations and mechanical hold-downs.
How sourcing works with Gala Elektrik
- Send a bill of materials (type/code, class, thickness, width, quantity) via Contact.
- Confirm stock vs import lead time and slitting dimensions.
- Ship against agreed quality and delivery terms.
Browse the English products hub: Transformer motor insulation products.
FAQ
What are transformer insulation materials?
Films (PET, Kapton), DDP and pressboards, laminates (DMD/NMN), prepregs, tapes, and sleevings are the most common families.
What is the difference between Class F and Class H?
They are thermal classes. Class H generally supports a higher continuous temperature rating; the final choice depends on system design.
Who supplies Filmcutter materials in Türkiye?
Gala Elektrik states that it offers Filmcutter’s Class F and H laminated products across Türkiye.
Does Gala provide slitting?
Yes. The company describes in-house slitting machines for precise customer widths.
Is single-source supply beneficial?
It can simplify compatibility, stock, and converting — subject to engineering requirements.
What data is needed for a quotation?
Material type/code, thermal class, thickness, width, length or quantity, deadline, and preferably the machine application.