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BP 25192

REV NO. 03

PAGE 1 OF 3

PLANT PURCHASING SPECIFICATIONBHOPAL

SUPERSEDESBP 25192 Rev.02

GLASS BACKED RESIN POOR EPOXYMICA PAPER TAPE/SHEET

1. GENERAL

This specification governs the quality requirements of Epoxy Resin bonded glassbacked mica paper tape suitable for resin poor (VPI) insulation system. The epoxybinder and accelerator in the tape should be compatible with Bisphenol-A andDiglycidylether based epoxy resin and acid anhydride hardener based VPIimpregnation system. The mica paper shall be uncalcined phlogophite grade. Theglass fabric backing shall be linen weave dexol treated. The coils insulated withthese tapes shall undergo VPI process with the above mentioned solvent less epoxyresin and hardener mix and shall have a temperature index of at least 155. Thematerial shall be supplied in bluel pink colour based on Sudan Blackl Sudan Red orequivalent dye.

2. APPLICATION

Used for conductor insulation of stator coils of electrical machines with VPIsystem.

3. COMPLIANCE WITH NATIONAL STANDARDS

There is no Indian Standard covering this material.

4. DIMENSIONS AND TOLERANCES

4.1 Sizes

The thickness, width and length shall be as stated on the order.

4.2. Standard Thickness

0.12 mm:!::0.02 mm

4.3 Standard Width

a)b)

Tape -12 mm:!::0.2 mmSheet -1000 mm:!::2 mm

However any other width can be ordered.

Revision:Reviewed & Brought up to date.CI.1,4.4& 8.1 modified.

Issued by :

Rev. 03 Date: 09.10.2010

STANDARDS AND MATERIALSGROUPTECHNICAL SERVICES DEPARTMENTDate of first Issue: Oct.1993

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PLANT PURCHASING SPECIFICATIONBHOPAL

BP 25192

REV NO. 03

PAGE 2 OF 3

4.4 Length! Roll

200 meter

However, for special applications, any other length may be ordered.

5. SHELF LIFE AND STORAGE

$ 5 DC 24 months, minimum from the date of delivery

> 5 to $ 25 DC: 12 months, minimum from the date of delivery

6. TEST METHODS

Unless otherwise specified all the tests shall be conducted as per the relevantmethods of IEC 60371 - 2.

7. SAMPLE FOR TESTS

Two rolls of tapel two square meter of sheet shall be sent to TSD for testing from everyconsignment.

8. PROPERTIES

8.1 ComQosition

When tested as per conventional method composition shall be as given below:

Total substance: 155::!::14 gm/m2

90 ::!::8 gm/m2

17::!::3gm/m2

48 ::!:: 3 gm/m2

Construction of glass cloth:

Warp EC 5-11 Tex, 24 fdlcm

Weft EC 5-11 Tex, 18 fd/cm

8.2 Accelerator Content (For information only): 13% on Nominal Bond

8.3 Volatile Matter: 0.7% Max.

8.4 Tensile Strenqth at 3% Elonqation: 150 N/cm, Minimum

8.5 Electric StrenQth (BDV) in air at Room Temp. (IS: 2584): 1.5 kV, Minimum

Mica Paper ..

Bond Content .

Glass Content

NOTE

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PLANT PURCHASING SPECIFICATIONBHOPAL

BP 25192

REV NO. 03

PAGE 3 OF 3

9. JOINTS

The material shall be supplied in continuous lengths as stated on the order. Rollshaving joint shall be packed separately and appropriately marked. 90% of theconsignment shall be without joints. Material used for jointing shall not adverselyaffect the properties of the cured insulation. If the material used for jointing is notcompatible with the insulation, the supplier shall notify accordingly. Per roll, maximumonly one joint is permitted.

10. TEST CERTIFICATE

Unless otherwise specified, three copies of test certificates shall be supplied.

In addition, the supplier shall ensure to enclose one copy of the test certificate alongwith their dispatch documents to facilitate quick clearance of the material.

The test certificate shall bear the following information:

BP 25192 Rev 03:Glass Backed Resin Poor Epoxy Mica Paper Tape/Sheet

BHEL Order No.

Manufacturer's/Supplier's Name

Batch No/Lot No.

Date of Manufacture

Test results obtained for the properties and dimensional tolerances as per thespecification.

11. PACKING AND MARKING

Bobbins: The tape shall be supplied wound tightly on rigid plastic bobbins withrounded edges with ID-75 mm. Mica paper shall be on top side. Outer diameter of rollshall not exceed 250 mm. The rolls shall be kept in a polythene bag, which in turnpacked in polystyrene container to avoid damage during transit! storage.

Each container shall be marked with the following:BP 25192: Glass Backed Resin Poor Epoxy Mica Paper Tape/ Sheet

BHEL Order No.

Manufacturer's/Supplier's Name

Batch No/Lot No.

Date of Manufacture

Note: Each roll shall be marked with "USE BEFORE " (Date of Expiry)