Insulation Paper Pressboard----[[LIREN ELECTRICAL INSULATION MATERIALS]]

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DDP Diamond Dotted Insulation Paper

Diamond Dotted Insulation Paper (DDP) consists of electrical insulation paper (IEC 60641) coated on both sides with diamond-shape dotted epoxy resin in B-stage. DDP Insulation Paper has high electrical and mechanical strength and shows good adhesive property. The epoxy resin can be cured at medium temperature, forming a stable insulation structure. DDP Insulation Paper is mainly used as turn-to-turn and layer insulation in oil immersed power and distribution transformers.

Nomex ® Paper

Type 410 is the original form of Nomex ® paper, and is widely used in a majority of electrical equipment applications. It is produced in thicknesses from 0.05 to 0.76 mm (2 to 30 mil) with specific gravities from 0.7 to 1.2. As a calendered product, it has high inherent dielectric strength, mechanical toughness, flexibility and resilience. Nomex ® Type 410 is used in almost every known sheet insulation application. (Download PDF) Type 411 is the uncalendered precursor of Nomex ® Type 410. It is available in thicknesses from 0.13 to 0.58 mm, (5 to 23 mil) with a specific gravity of 0.3 and correspondingly lower electrical and mechanical properties. It is used in applications such as motor phase insulation and transformer coil end filler, where high bulk and conformability are of prime importance along with increased impregnability and saturability. (Download PDF) Type 414 is electrically and thermally similar to Nomex ® Type 410, but is calendered under different conditions which produce a strong, but more flexible and conformable sheet with an open surface. It is produced in thicknesses from 0.09 to 0.38 mm (3.4 to 15 mil) with specific gravities from 0.9 to 1.0. It is designed for use as slot insulation in hand-wound motors, for linear wrapping of wire and as main insulation of fluid-filled and dry-type transformers where conformability and impregnability are required. (Download PDF) Type 418 Is produced by adding 50 percent mica platelets, intimately blended with the floc and fibrids during papermaking. It is available in thicknesses from 0.08 to 0.36 mm (3 to 14 mil) and is designed for high-voltage applications, including motor conductor and coil wrap, and transformer ground and layer insulation. Nomex ® Type 418 is a calendered product with high inherent dielectric strength of 30 to 40 kV/mm (760 to 1015 V/mil), but can also be readily impregnated with varnishes where this is desirable. Nomex ® Type 418 offers increased voltage endurance when compared to Nomex ® Type 410. (Download PDF) Type 419 is the uncalendered precursor of Nomex ® Type 418. It is available in two thicknesses, 0.18 mm (7 mil) and 0.33 mm (13 mil), with a specific gravity of 0.5 for applications where conformance and saturability are required. (Download PDF) Type E56 is a medium-density paper (specific gravity 0.7) produced in thicknesses from 0.13 to 0.51 mm (5 to 20 mil). This calendered paper has mechanical and electrical properties intermediate between Nomex ® Type 410 and Nomex ® Type 411. It offers a higher yield and therefore economically a more attractive solution in applications where it is not critical to use to the full extent the mechanical or electrical properties of Nomex ® Type 410. (Download PDF)

High Density Transformer Pressboard

High Density Transformer Pressboard is a high grade precompressed pressboard made with 100% unbleached sulphate wood pulp. This product has been through in-line metal detection during production process. It is according to IEC60641-3-1 Type B3.1 This product has high purity and density, low shrinkage and compressibility, excellent mechanical strength and electrical strength, and optimal oil-impregnability. High Density Transformer Pressboard is widely used in 500KV oil-filled power transformers and distribution transformers, reactors, electric motor, and other electrical machines and appliances.

Transformer Presspaper

Transformer Presspaper is a high grade calendered insulation paper made with 100% unbleached sulphate wood pulp. This product has high purity, mechanical strength and electrical strength, low shrinkage, and good oil-impregnability. Transformer Press-paper is widely used in oil-filled power transformers and distribution transformers, reactors, electric motor, and other electrical machines and appliances.

TOYO Vulcanized Fibre

TOYO Vulcanized Fibre from Japan is a material manufactured by gelatinizing several plies of high purity cellulose papers. It has extremely high internal bond strength, and mechanically excellent punching, forming, machining and many other unique properties. TOYO proudly carries specialtygrades to comply any application required by users, such as water resistant grades, flame retardant grades, combination grades etc. in roll, sheet and coil. Main Types: HB-77 : This fibre uses original cotton fibre sheets as its raw material. The available colors are red, white, gray and black. It is the general used fibre which can be used for motors, speakers and other electrical appliances. NF-77 : NF-77 is a UL listed flame retardant vulcanized fibre with good tracking rate, high ampere-arc, and hot wire ignition rate. It has almost the same workability as the standard grade, but can be easily flexed if slightly pre-heated. K-57 : K-57 is listed in Class E of Japan Electricity Regulation. It has an ideal incorporation of good workability of fibre and dimensional stability.

MIKI Insulation Papers

MIKI insulation papers (Pressboard class 2, Coil Insulating paper Class 2 & LD-Board) are high grade insulation material with 100% wood pulp used for wide insulation field. Main Types: 　1. PB-2 (Pressboard Class 2): principal Applications: Electric motors, transformers, rings, flanges, spacers, gaskets, capacitors, etc, Available colors are brown, red, green. 　2. PI-2 (Coil Insulating Paper Class 2):Principal applications: Speaker coil paper, cable raping, capacitors, etc. 　3. LD-Board: This is a Non-pressed low density fiber paper. It is used when high density is not required. 　　Other insulation papers include "BASE DDP", wrinkling coil paper for transformers and "Senkaski" paper for Speaker coil.

Aramid Paper

LR-AP710 Aramid Paper is a calendered insulation paper made from a synthetic aromatic polyamide polymer. Aramid Paper offers high inherent dielectric strength, mechanical toughness, flexibility and resilience. Its products can extend the life of electrical equipment, reduce premature failures and repairs, and act as a safeguard in unforeseen electrical stress situations. LR-AP710 Aramid Paper is widely used in almost every known electrical insulation application for transformers, motors, coils, and wires.

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