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Solid Insulation Materials | Brand: Trafo Tech BD | Factory Certified & Tested

Diamond Dotted Paper

SKU: TRF-6 Copied!
• IEC 60076 & IEEE Compliant • Nationwide Delivery • 4 Suggested Products
Product Name
Diamond Dotted Insulation Paper (DDP)
Thickness
0.08 mm
Roll Width
1000 mm (1000 mm master roll)
Base Material
Electrical-Grade Cellulose Kraft Paper

High-grade Diamond Dotted Paper (DDP) - 0.08mm x 1000mm (ডায়মন্ড ডটেড ইনসুলেশন পেপার) engineered for inter-layer coil insulation in oil-immersed distribution and power transformers. Manufactured from electrical-grade Kraft paper coated on both sides with B-stage heat-curable epoxy resin in a precise diamond dot pattern. During transformer coil baking (100°C–120°C), the epoxy resin melts and bonds the winding layers permanently together while leaving open channels for fast transformer oil flow and air release.

1 Variants Available
Commercial Pricing
All rates ex-factory Gazipur. Standard VAT 7.5% applicable.
WhatsApp
Hotline: +880 1335-235190
12-24M WARRANTY
Official factory backing
IEC COMPLIANT
60076 Spec certified
FACTORY TESTED
Full FAT certified
TURNKEY SETUP
Delivery across BD

Verified Engineering Ratings & Parameters

Laboratory tested ratings compliant with IEC 60076 & factory acceptance benchmarks.

9 Parameters
Engineering Parameter Specification Rating / Value
Product Name Diamond Dotted Insulation Paper (DDP)
Thickness 0.08 mm
Roll Width 1000 mm (1000 mm master roll)
Base Material Electrical-Grade Cellulose Kraft Paper
Epoxy Coating Pattern Diamond Grid / Both Sides
Curing Temperature 100°C - 130°C
Thermal Class Class A (105°C) / Class F (155°C) Option
Bonding Strength (After Curing) ≥ 450 kPa (at 100°C)
Breakdown Voltage (in Oil) ≥ 4.40 kV/layer

Engineering Scope & Design Overview

Manufactured with high-grade electrical steel, electrolytic copper, and industrial-duty enclosures.

Premium Diamond Dotted Paper (DDP) for Transformer Insulation in Bangladesh

At Trafo BD, we supply high-performance Diamond Dotted Paper (DDP) designed to enhance the mechanical strength and short-circuit resistance of transformer coils. Made from  100% unbleached sulfate cellulose Kraft paper, our DDP is coated on both sides with heat-curing B-stage epoxy resin dots.Unlike standard flat Kraft paper, the diamond dot resin structure creates open oil impregnation channels. When subjected to thermal drying, the dots melt, fuse adjacent conductor turns, and cure into a rigid composite structure. This prevents axial coil movement and displacement during high fault currents and sudden electromagnetic surges.

Key Benefits for Local Transformer Manufacturers & Repair Workshops:

  1. Superior Short-Circuit Withstand: Fuses the winding layers into a solid block, preventing coil deformation during grid fault conditions.
  2. Optimal Oil Flow & Void Elimination: The uncoated spaces between the diamond dots allow transformer oil to completely saturate the insulation layer without trapping air pockets or moisture.
  3. High Tensile & Dielectric Strength: High breakdown voltage in oil ensures long service life for distribution transformers under continuous heavy load.
  4. Clean Slitting & Handling: Easy to unroll and cut to custom widths without flaking or losing epoxy coating particles during manual or automated winding.

Common Applications:

  • Layer-to-layer insulation in distribution transformer coils.
  • Inter-turn bonding for power transformer windings.
  • Shielding and insulation for dry-type and oil-immersed transformers.
  • High-voltage motor coil inter-layer taping.

Looking for Diamond Dotted Paper (DDP) price per kg in BD (ডায়মন্ড ডটেড পেপার দাম)? Contact Trafo BD's sales team today for technical datasheets, pricing quotes, and fast delivery across Dhaka, Chattogram, Gazipur, Bogura, and Narayanganj.

Target Industrial Use Cases & Sectors

Designed to withstand rigorous commercial and industrial electrical environments across Bangladesh.

01

Heavy Steel & Induction Smelting

Built to endure violent load swings, harmonic distortions, and repetitive short-circuit stresses in arc furnaces and rolling mills.

02

Textile, Garments & Spinning Mills

Guarantees zero-dip power continuity, low operational temperature rise, and strict fire-safe dielectric protection.

03

Utility & Commercial Substations

Fully approved for 11kV/33kV distribution networks under DPDC, DESCO, BREB, WZPDCL, and high-rise commercial towers.

Quality Assurance & Factory Acceptance Testing (FAT)

Every unit is validated on high-precision test benches before customer dispatch.

✓
Turns Ratio & Vector Group Verification Confirms accurate transformation ratio on all tap positions as per IEC 60076 specifications.
✓
Winding Resistance Measurement Balanced micro-ohmmeter testing across all phases to guarantee symmetrical current distribution.
✓
Oil Breakdown Voltage (BDV) Dielectric Test Automated 80kV gap breakdown test ensuring dielectric oil strength exceeds 60kV before delivery.
✓
Factory Acceptance Testing (FAT) Comprehensive routine and type testing witnessed at our modern testing bay prior to dispatch.

Frequently Asked Engineering & Procurement Questions

Essential details regarding procurement, custom fabrication, and delivery in Bangladesh.

For standard ratings (100kVA to 3000kVA), our estimating team issues formal quotation letters with datasheets within 2 to 4 hours. For turnkey substations, please provide your Single Line Diagram (SLD) for complete engineering estimation.
Yes. Client representatives, electrical consultants, and EPC project managers are welcome to visit our testing bay in Dhaka to witness ratio, vector group, loss, and dielectric insulation tests.
Trafo Engineering provides a complete 12 to 24 months manufacturer warranty against manufacturing defects, paired with 24/7 on-site emergency mobile service across Dhaka, Gazipur, Narayanganj, and Chattogram.
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