Why Your Transformer Insulation Supply Chain Needs an Upgrade
Procurement engineers face critical challenges in sourcing reliable insulation materials.
Here's how SIDA solves the most common pain points in transformer manufacturing.
⚡
Dielectric Failure Risks
Substandard insulation materials cause partial discharge, breakdown, and catastrophic transformer failure — resulting in warranty claims and reputational damage.
Certified ≥8.0 kV/mm electrical strength — every batch tested
📦
Inconsistent Batch Quality
Thickness variation, density fluctuation, and chemical impurity in alternative suppliers' materials cause production line rejections and scrap costs.
<0.3% defect rate with full batch traceability & test reports
⏱️
Unreliable Lead Times & MOQ Barriers
Long delivery cycles, high minimum order quantities, and inflexible suppliers disrupt production planning and tie up working capital.
3-7 day dispatch · No MOQ · Consignment inventory available
Product Portfolio
Complete Insulation Material Range
From standard kraft paper to high-density transformerboard and premium pressboard — all
manufactured under ISO 9001:2015 quality systems with full batch traceability and certified test reports.
Click any product below to view detailed specifications, images, and application notes.
Each product is manufactured under ISO 9001:2015 with full batch traceability.
Kraft Paper
30–150 g/m² · 0.05–0.30mm · All voltage classes
Kraft Paper
Insulation Kraft Paper
Manufactured through a controlled sulfate pulping process preserving natural cellulose fiber strength while achieving exceptional purity and uniform density. Delivers consistent dielectric performance across all voltage ratings with roll widths up to 1200mm and custom slitting available.
40–100 g/m² · Controlled porosity · Power cable grade
Cable Paper
Electrical Cable Paper
Made from 100% pure cellulose with high oil absorption and low dielectric loss. Uniform thickness, excellent mechanical integrity, and high chemical purity (acid-free). Compatible with mineral oil and synthetic ester oils for power cable insulation systems.
Insulating pressboard components for transformer winding support and oil duct formation. Precision-fabricated from IEC 60641-2 compliant pressboard with controlled thickness tolerance, high tensile strength, and excellent electrical properties for reliable oil flow and winding geometry.
High-performance insulation solution designed for transformer windings and leads, providing reliable mechanical and dielectric properties in oil-immersed electrical systems. Manufactured from high-quality crepe paper with excellent conformability for conductor covering and lead insulation.
High-extensibility insulating paper with 20–80% elongation for flexible wrapping of irregular-shaped conductors, taping applications, and stress relief in transformer windings. Excellent conformability without tearing.
Kraft paper coated with a diamond-pattern modified epoxy resin for heat-bonding applications. Single-sided coating with precise weight control (4.0–8.0 g/m²) and consistent adhesive thickness (6–12 μm). When heated, epoxy dots melt and bond adjacent layers — maintains structural integrity under short-circuit electromagnetic forces while allowing complete oil penetration between layers.
Premium-grade cable insulation paper manufactured to IEC 60554 standards. Available in thicknesses from 0.10mm to 0.55mm with controlled tolerance, high tensile strength (MD & CMD), and excellent electrical strength both in air and oil. Designed for high-voltage power cable applications with reliable dielectric performance.
Premium cellulose-based pressboard manufactured from 100% high-purity sulfated wood pulp, engineered specifically for EHV and UHV transformer applications. Exceeds IEC 60641-3-1 Type B 3.1A with density ranging 1.15–1.35 g/cm³ and thermal classification Class A (105°C per IEC 60085). Oil absorption >10% for enhanced dielectric and thermal conductivity.
High-grade electrical pressboard manufactured with hot-air drying and precision calendering. Manufactured to IEC 60641-2 and IEC 60641-3-1 B.2.1 B standards. Outstanding dielectric performance, superior mechanical strength, excellent oil compatibility, and high chemical purity — the preferred choice for critical insulation components rated 1–35kV.
SIDA insulation materials are engineered for the most demanding electrical applications
across power generation, transmission, and distribution.
EHV / UHV Power Transformers
110kV–750kV+ oil-immersed transformers
Distribution Transformers
Up to 36kV class — urban & industrial networks
Power Cables
HV & MV oil-filled & mass-impregnated cables
Instrument Transformers
CT / PT insulation for metering & protection
Reactors & Inductors
Shunt & series reactors, filter inductors
Switchgear & Bushings
HV & MV switchgear, transformer bushings
Quality Assured
Certifications & Compliance
Every SIDA product is manufactured, tested, and certified to the highest international
standards — giving you complete confidence in every shipment.
ISO
ISO 9001:2015
Quality Management Systems — full production traceability with certified test reports
IEC
IEC 60554
Cellulosic papers for electrical purposes — specification & test methods
IEC
IEC 60641
Pressboard & presspaper for electrical purposes — Types B 2.1 / B 3.1A
ASTM
ASTM D202 / NEMA
Standard test methods & NEMA electrical insulation material specifications
Request Quotation
Get Your Custom Quote Today
Tell Us What You Need
Our engineering team will review your requirements and respond with
a detailed quotation, technical datasheets, and lead time within
one business day. Sample requests welcome — no minimum order.
Response within 24 hours
Free sample for first-time buyers
Technical datasheet included with every quote
EXW / FOB / CIF / DDP pricing available
Your information is secure and will never be shared. We reply within 1 business day.
Why SIDA
Manufacturing Excellence, Engineered Reliability
In a market where material consistency directly impacts transformer performance and
lifespan, SIDA delivers measurable quality that procurement engineers can rely on.
From R&D to quality control, production to global logistics — our dedicated
team ensures every shipment meets the highest standards for transformer
insulation materials.
SIDA's G4 transformerboard consistently meets our stringent requirements for 500kV transformer
production. Batch-to-batch consistency and complete test documentation give us confidence
in every shipment.
Senior Procurement Engineer
Leading Transformer OEM, Europe
We switched to SIDA for our kraft paper supply two years ago. Their technical support team
helped us optimize material selection, and their on-time delivery has been outstanding.
Highly recommended for any serious transformer manufacturer.
What products do you manufacture and what standards do they meet?
SIDA manufactures Kraft Paper (30–150 g/m², 0.05–0.30mm), Cable Paper (40–100 g/m²), Diamond Dotted Paper (0.05–0.13mm base, 0.15–0.30mm dot), Crepe Paper (20–80% extensibility), Crepe Paper Tube, Ladder Duct & Strip, PSP 3055 SL Cable Paper, G4 Transformerboard High Density (1.15–1.35 g/cm³, up to 30mm), and Pressboard PSP-3050. All comply with IEC 60554, IEC 60641-3, ASTM D202, and NEMA standards. ISO 9001:2015 certified manufacturing.
What are your lead times, MOQs, and how do I place an order?
Lead times: 3–7 days for stocked items, 15–25 days for standard production, 20–30 days for custom specifications. MOQ: Flexible — as low as 1 roll for sampling, 500–1,000 kg for standard production. To order: Submit an inquiry via the form above, email jessie.feng@sidanm.com, or call +86-15958243831. We provide a detailed quotation within 24 hours including pricing, lead time, and delivery terms.
How do you ensure consistent quality across batches?
Quality control is integrated at every production stage: premium high-alpha cellulose pulp (>92% purity), climate-controlled manufacturing (20–25°C, 50–65% RH), real-time Statistical Process Control monitoring, and comprehensive finished-product testing. Every batch receives a certified test report covering electrical, physical, chemical, and purity parameters. Our defect rate consistently remains below 0.3%.
Do you provide custom processing and technical support?
Yes. We offer precision slitting and rewinding (±0.5mm tolerance), guillotine sheet cutting, die-cutting of complex shapes, special treatments (pre-drying, surface enhancement, cleanroom packaging), CNC machining for transformerboard components, and custom packaging. Our engineering team provides complimentary consultation on material selection and application optimization. Custom processing adds 5–10 days to lead time.
What payment terms and delivery conditions do you offer?
Delivery terms: EXW, FOB, CIF, and DDP available. Payment: T/T 30% deposit for new customers (balance before shipment), 30–60 day net terms for established relationships, L/C at sight accepted. Pricing: Tiered volume discounts at 5+ tons, preferential contract pricing for 100+ tons annual volume. All prices quoted include complete test certification.
Start Your Order
Ready to Upgrade Your Insulation Presspaper & Pressboard Supply?
Join 200+ transformer and cable manufacturers who trust SIDA for consistent quality,
certified reliability, and responsive service. Send us your requirements today —
we'll respond with a complete quotation within 24 hours.
Fill out our inquiry form and our engineering team will respond with pricing, technical datasheets, and lead time within one business day. Samples available — no minimum order.
