HD 307.2.2 S1:1986

SLOVENSKI STANDARD
SIST HD 307.2.2 S1:1998
01-oktober-1998
Specification for solventless polymerisable resinous compounds used for

electrical insulation -- Part 2: Methods of test - Test methods for coating powders

Specification for solventless polymerisable resinous compounds used for electrical

insulation -- Part 2: Methods of test -- Test methods for coating powders for electrical

Bestimmungen für Reaktionsharzmassen und -formstoffe in der Elektrotechnik -- Teil 2:

Spécifications relatives aux composés résineux polymérisables sans solvent utilisés

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in

utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,

procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in

copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.

Pour de plus amples renseignements, consulter les rapports de vote mentionnés dans le tableau ci-dessus.

Further information can be found in the Reports on Voting indicated in the table above.

1) The formal decisions or agreements of the I EC on technical matters, prepared by Technical Committees on which all the National

Committees having a special interest therein are represented, express, as nearly as possible, an inte rnational consensus of opinion

2) They have the form of recommendations for inte rnational use and they are accepted by the National Committees in that

ational unification, the I EC expresses the wish that all National Committees should adopt the text of

the I EC recommendation for their national rules in so far as national conditions will permit. Any divergence between the I E C

recommendation and the corresponding national rules should, as far as possible, be clearly indicated in the latter.

This standard has been prepared by Sub-Committee 15C: Specifications, of I EC Technical Committee No. 15: Insulating

Further information can be found in the Repo rt on Voting indicated in the table above.

Publications Nos. 79-7 (1969): Electrical Apparatus for Explosive Gas Atmospheres, Pa

93 (1980): Methods of Test for Volume Resistivity and Surface Resistivity of Solid Electrical Insulating

112 (1979): Method for Determining the Comparative and the Proof Tracking Indices of Solid Insulating

212 (1971): Standard Conditions for Use prior to and during the Testing of Solid Electrical Insulating

216-1 (1974): Guide for the Determination of Thermal Endur ance Properties of Electrical Insulating Mate-

rials, Part 1: General Procedures for the Determination of Thermal Endurance Properties,

243 (1967): Recommended Methods of Test for Electric Strength of Solid Insulating Materials at Power

250 (1969): Recommended Methods for the Determination of the Permittivity and Dielectric Dissipation

Factor of Electrical Insulating Materials at Power, Audio and Radio Frequencies including

394-2 (1972): Varnished Fabrics for Electrical Purposes, Pa rt 2: Methods of Test.

455-1 (1974): Specification for Solventless Polymerisable Resinous Compounds Used for Electrical Insula-

ISO Standard 60 (1977): Plastics — Determination of Apparant Density of Material that Can be Poured from a Speci-

683-1 (1968): Heat-treated Steels, Alloy Steels and Free-cutting Steels, Part 1: Quenched and Tempered

This standard is one of the series which deals with solventless polymerisable resinous compounds used

This standard gives methods of test for thermo-setting coating powders as defined in Sub-

clause 3.7 of IEC Publication 455-1: Specification for Solventless Polymerisable Resinous

To be determined in accordance with ISO Standard 60: Plastics — Determination of Apparent

Funnel according to Figure 1, page 35, provided with means for placing it in a vertical

Work powder sample on a sheet of paper until there is no tendency for the material to pack or

cake. Place the funnel in a vertical position and close the small end with the hand or with a suitable

strip and pour a 100 g sample of powder lightly into the funnel, avoiding any tendency to pack it.

Then quickly open the bottom of the funnel and at the same instant start the stop watch or timer.

Allow the powder to run freely from the funnel, and stop the watch or timer at the instant the last of

State the time, in seconds, required for the funnel to discharge, to the nearest 0.5 s or, if necessary,

1.3.1 Dry sieving in accordance with ISO Standard 2591: Test Sieving, with sieve numbers and sizes

The vacuum sieving device shall be capable of maintaining a vacuum of 125 ± 12.5 mm of water

as measured by a manometer. The slit nozzle which rotates below the sieve shall revolve at a speed

Increasingly higher vacuums up to 700 mm of water are maintained for smaller sized sieves.

If the coating powders are not to be transferred for weighing, weigh each of the selected sieves and

sample to 0.1 g. If samples are to be transferred from the sieves, weigh sample to 0.0001 g. For sieve

size 32 gm and larger weigh 10.0 g samples. For sieve sizes less than 32 gm, weigh out 1.0 g samples

and transfer to sieve. Put the transparent cover on the sieve and place the sieve in the vacuum

sieving apparatus. Operate the sieving apparatus for 10 min ± 15 s in a vacuum of 150 mm of water

for sieve sizes larger than 74 .trn, a vacuum of 250 mm of water for sieve sizes 74 gm to 20 gm and

Remove the sieve and cover from the apparatus and weigh to 0.1 g the quantity of material

retained on the sieve or adhering to the cover, then subtract the tare weight from the total. If the

material is transferred to the balance, the sieve shall be carefully brushed on both sides as well as the

Repeat the procedure for each sieve used. Calculate the percentage of powder retained for each

This is determined in accordance with the requirements Clause 6 of I EC Publication 455-2:

Specification for Solventless Polymerisable Resinous Compounds Used for Electrical Insulation,

If the surface of the hot plate becomes pitted, it should be polished smooth or replaced.

— Wood spatula approximately 2 mm X 10 mm X 150 mm or similar non-heat conducting

Place the hot plate in a draught-free area or a three-sided 305 mm high draught shield.

Allow at least 30 min for the hot plate to warm up so as to maintain the surface temperature to be

Coat the plate with a thin coat of mould release. Wipe off the excess with a clean towel.

Keep rubbing the molten resin in a circular motion until the resin ceases to flow and forms an

After the test is completed, clean the resin from the plate with the metal putty knife.

Repeat the test three times with fresh resin. The results should agree within a 2 s range.

The sample size should be 2.0 ± 0.1 g, and the heating times are 1 h at 105 °C and 5 min at

Heat the dish at 105 ± 3 °C for 1 h or at 230 ± 3 °C for 5 min. Cool to room temperature, then

Report the mass of the non-volatile matter as a percentage of the mass of the sample to the

Specimens shall be prepared in accordance with the instructions of the supplier using one of the

— Type A: 150 mm X 200 mm X 1 mm (approximate) clean cold rolled steel plates in accordance

with ISO Standard 683-1: Heat-treated Steels, Alloy Steels and Free-cutting Steels.

— Type B: 10 mm X 10 mm X 150 mm steel bars in accordance with ISO Standard 683-1.

Prior to coating, the steel should be carefully cleaned with 1,1,1-trichloroethane or any other

Note. — The dimensions given are preferred, others may be used subject to agreement between purchaser and supplier.

Fluidized bed coating is one of the acceptable coating processes for laboratory use.

Special specimens are required for testing properties described in Sub-clauses 2.5.1, 2.5.4,

To test properties described in Sub-clauses 2.10, 2.13, 2.15, the specimen description is given

All specimens shall be examined by normal eyesight for adequate wetting of the substrate, general

2.3.1 A micrometer as described in Sub-clause 2.1 of I EC Publication 394-2: Vanished Fabrics for

The high-voltage generator shall generate a d.c. test voltage which is adjustable between + 5% and

The internal resistance shall be chosen so that the steady state short-circuit current has an average

During a high voltage flashover the maximum value of the current shall be between 10 mA and

One pole of the high-voltage generator shall be connected to the protective conductor or to the

body of the high-voltage generator. The other pole of the high-voltage generator shall lead to the

high-voltage testing head through a screened high-voltage cable. The high-voltage generator shall be

provided with a device which optically and/or acoustically clearly indicates each spark discharge at

The testing head shall be provided with an electrically conductive sheath which is connected to

A protective resistor shall be mounted in the testing head for limiting the current (from 10 mA up

The electrodes shall consist of either flexible metal brushes whose bristles closely fit the surface of

the specimen without leaving any free space during brushing of the surface or conductive

The test voltage of 15 kV/mm is adjusted and the test electrode having a large contact area is

moved with a maximum speed of 4 cm/s across the surface of the specimen. During this time, the

test voltage is to be observed. The test voltage may drop by no more than 10%. Pores and flaws are

indicated by visible sparks on the test electrode and simultaneously by an optical and/or acoustic

This is determined in accordance with either Method 1 of ISO Standard 1518: Paints and

2.5.1 ISO Standard 1518 specifies a test procedure for determining under standard conditions the

resistance to penetration by scratching with a needle of a single coating or a multicoat system of

paint, varnish or related product. Either a single specified load is applied to the needle (go/no-go

test) or increasing loads are applied to the needle to determine the minimum load at which the

This test determines the mechanical resistance of the surface of a specimen coated with a pow-

dered resinous compound against the penetration of a sharp object under the effect of a load.

2.5.3.1 A scratch hardness testing apparatus permitting the determination of the force, in newtons, at

which a scratch diamond of defined dimensions causes a scratch — recognizable by means of a

magnifying glass — on the steel substrate surface. The scratch diamond has the following dimen-

The apparatus consists essentially of a rotating turntable (1 rev/min) and a scale arm which rests

on the specimen. A scratch diamond is horizontally positioned on the arm which may be loaded by

Three steel plates (2 mm X 100 mm X 100 mm) of the type of steel as described for Type A

The specimen is placed on the turntable and is lightly pressed to it by means of a knurled nut. The