IS 3084 : 1989 ( Reaffirmed 2003 )

Indian Standard

PENCIL SLATS miifs iif;fw Th

SPECIFICATION
.. STFTW v--i

( Second Revision )
f?fVfk

( `zum y+bml )

UDC

674'032.3/`4-415

: 686.863.3

@ BIS 1989

BUREAU
MANAK

OF
BHAVAN,

INDIAN

STANDARDS
ZAFAR MARG

9 BAHADUR SHAH NEW DELHI 110002

October 1989

Price Group 1

`Limber

Stores Sectional

Committee,

BDC 33

This Indian Standard ( Second Revision ) was adopted by the Bureau of Indian Standards on 4 <January 1989, after the draft finalized by the Timber Stores Sectional Committee had been approved by the Civil Engineering Division Council. This standard was originally published in 1963 and the first revision lvas brought out in lYi,i. this second revision, Amendment No. 1 issued to the standard has been incorporated. IS 1373 : 1959 covers black lead pencils. their casing have not been specified. However, the species of timber for the nlanufacture In of

To a very limited extent, the requirements of timber for pencil slats are still being met by import However, the bulk of production is now based on indigenous of African and American cedar. The indigenous sllccies incluc!etl in this standard al-e based on investigations on species of timber. their suitability for making pencils carried out by the Forest Research Institute, Debra Dun. Tllis standard contains resuits of investigations a revised list of species suitable done and a quality classification for pencil slats in accordance with the latest of the species has been included.

This standartl contains a revised Annex U recommending a t\vo-step and an alternative single-step waxing ant1 dyeing treatment procedure. Also it includes Annex A for recommended sawing The dimensional tolerances to be allowed for slats prepared from green or practice for slats. insufficiently seasoned timber are also included in Kate 2 below 5. In the formulation of this standard, among the standards and practices practices in the field in this country. due weightage has been given to international co-ordination prevailing in different countries in addition to relating it to the

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test of analysis, shall be rounded 011` in accordance with IS 2 : 1960 `Rules for rounding off numerical values ( mi.scd )`. The number of significant places retained in the rounded off value should be tllc same as that of tile specified value in this standard.

IS 3084 : 1983

Indian Starzdard

PENCIL SLATS- SPECIFICATLON ( Second Revision )
1 SCOPE 1.1 `l~lli~ stantlartl of
(1 Second pencil slats. Revision ) Covers the

1~c~71irctricnts

4.3 The timber and reasonably ,grain. It sliall
shall tions not and chip shall

for pencil Slats sllall IN> hoIt, ligllt strong b\,ith 5trajgllt ;III(I ~.lo.~ have good niachining ])rcj,)cl I i(,.q,
off tIllring wllictle man7tGctu~irq ~\,cll in melldirtl;. oIl(~t`aII1

2 REFERENCES 2.1 `1`11~G~llo~virlg Indian acljtlncts to tliis stantlard: IS "Vf,.
IS

addition, polish. Standards are necessary

it shall

take

a strlootlr

finish

and

good

5 DlMENSlONS
Tifle

5.1 `rhe len~tll, pencils
sliall a) be as follow3:

I\-idtli

ant1

thickticss

of

lx'",

11

ltj7.5 : 19.59

Specification

R)r black

IS 707

: 1976

Glossary of terms applicable to timber technology and utilization ( SCc'o?Id Yfi'isiO7l )

Length:

184

-,

2 I~I~I,
111111 ( 8 ply ),

b) IVidth:

70
55

-;m 2
-`-

63'3 .) 2 3 TERMINOLOGY 3.1 I'or tlie purpose of this stan(lard, the definitiolrs given in IS 707 : 1!)76 shall apply. 4 SPECIES OF TIMBER from 1. any
cj Thickness

mm

( 7 ply

),

2 mm

( 6 ply 1,
),

47

-)m 2

111111 ( 5 ply

5.5 *

0.5 nlm.

NO'I`ES

4.1 Ycncil slats sliall be manufactured of the species of timber given in Table 4.2 Other species of timber may <,ibject to prior agreement bet\\*een and the supplier. Table 1 Species of Timber Manufacture
1,Claws
4.1 and 7

2 For conver.~ion of pt,ncil slats, the log shr~ulcl firat I,e sawn into pencil slat blocks of adequate thickllcss,

also be used the purchaser

allowing margin for subhequent shrinkage and tlrpelldillg LIpon the `pl!" of slats desired Cset.\nnes ;I ). I'ur ljrst results, the blocks should firyt be air heasunetl to the
requirctl
Oversizes nloisture content before lirial sawing 0f sl`its. ill the width of slats. inclusive> of shrinkage

for Pencil

)

during drying and the sawing tolerances mcntionetl in 5.1 shall, however, he provided as follows if slats :irr sawn from green or insufliciently sea~onctl bloch3: Width: 70 `. 5 *n*n 63'5

( 8 ply j, 5 mnl ( 7 ply j, 55 5 mm ( 6 1'1) ), ;incl 47 j 4 nlm : 5 ply ).

l:xtrx tolcranccs over those pre&lxd in 5.1 arty I,,,, required in the length and IhicLnesi c,f slat\.

6 REQUIREMENTS 6. 1 `I'he moisture e\ xeed 11! percent. Nc)`rE moisture contcnl into slats. ,2 `I'lre
content of tilt: Slats shall llot

?`llis is actlie\-ed

4, not esceedlng

se.ksoning tllc tinllll,l to it 12 l)erwnt before sawing

slzlls shall be f'ree frown centre tie;ut pith ), any kind of decay, splits, checks, CI.;IC~S, jots, splinters, borer holc~, Lvarp and any other efect which is likely to impair their utility.

1

IS 3084 : I989
7 TREATMENT 7.1 Slats of all timbers given in `l'able 1 shall be either with treatment or without treatment.
of pencils, however, it is NOTE - Before manufacture to improve the wilting property of wood by essential If desired, the colour of wood may also be waxing. by dyeing treatment ( see Annex B ). iIl~p~0VCcl

9 MARKING 9.1 Each bundle of pencil slats sllail I)(\ Irgil)ly and indelibly marked with the followiI>g:
a1 b)

Quantity

packed-number name. used,

of' slats and ply:
initials

Manufacturer's cd trade-mark,

or recogniz-

8 PACKING 85. Pencil slats shall be bundled together suitable numbers as agreed to between purchaser and the supplier. in
tl1e

c) Species of timber d) \Vhether treatment

is given

or not, anti

Year of nianufalcture.

ANNEX A ( ClaLw 5 )
SAWING A-l
air

PROCEDURE

FOR SLATS

`The green saw11 pencil s!at blockj should IX seasoned to appropriate moisture content of slats to avoid warping of sawn before sawing slats. Sawing of slats is a precision job owing to the xrery close tolerances demanded in slat thickness. Slat saws ( band or circular ) need accurate

setting antI lnaintenancc to avoid taper iti \vicllll and len3tli of sawn slats. The saL\yIl slats necrl proper stacking lvith restraint during storage to avoid warping and should finally be allo~ccl to dry to m,,isture content below l:! percent.

ANNEX B ( t,`lause 7 )
WAXING B-l PROCEDURE B4.B Either a two-step or a single-step waxing and dyeing procedure shall be used for the slats B-l.2 Two-Step Process AND DYEING TREATMENT ccl to cool through a suitaiJle I augc of' tenlpelatur c to ensure 8 to 15 percent of wax absorption OII the basis of the dry weight of slats, depending The superficially lvaxed slats upon the species. shall bc finally given a heat treatment in a kiln at 70 to 80°C for 12 to 24 hours to allo\v the l\`ax to penetrate uniformly into the slats. B-l.3 Single-Step Process ) Process ( Alternative

B--1.2.1 In the two-step procedure, partially ail dried slats shall be first charged into a vacuumpressure treating cylinder and subjected to a vaccum for about half-an-hour. The water solution of dye shall then be admitted without breaking the vacuum. A suitable hydraulic pressure shall then be applied for adequate period, depending upon the permeability of the species, to ensure impregnation. N01`L - In cast of dcodar, cypress and juniper, a vacuum of 55 cm of mercury is applied for 30 minutca followed by a hydraulic pressure of 0.85 to 0.95 N/mm' The schedule is suitably varied for treating for 1 hour. timbers other than deodar, cypress and juniprzr. B-1.2.2 The dyed slams shall then percent moisture content in open `l'hey shall then be dipped in wax at 80 to 100°C and the wax be dried to 12 air or in a kiln. molten paraffin shall be allolv-

The dyeing and waxing of air dried slats ma) alternatively be carried out in a single step using a suitabje water emulsion or tlispersion of w;\x to which dye shall be added provided an absoll)tion of wax bctwcen 8 to 15 percent of the dry weight of slats is attained. The impregnation \vith wax cululsion or dlspclsion shall be carrictl treating procedlut* out by a vacuum-pressure similar to that r!escribed in B-1.2.1 keeping the treating solution heated above the melting point of wax, if necessary. The treated slats shal! theta be finally dried and conditioned in a kilt1 for adequate period and the temperature finall) raised to 70 to 80°C.

2

-.
Standard Mark

_

Standard Mark is governed by the provisions of the Bureau of Indian the Rules and Regulations made thereunder. The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, testing and quality control which is devised and supervised by BIS and operated by the producer. Standard marked products are also continuously checked by BLS for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards. The use of the
Standards ht, 1986 and

I

Bureau of Indian Standards 111s is a statutory institution established under the Bureau

of

Indian Standards

Act,

IV?6 to l>lonlote

harmonious development of the activities of standardization, goods and attending to connected matters in the country. Copyright BlS has the copyright any form without grade designations. of all its publications. permission the standard, relating

markin g and quality

certification

ul

No part of these publications of BIS. of necessary details, such

may be reproduced and sizes, type

in or BIS.

the prior Enquiries

in writing to copyright

`This does not preclude as symbols to the Director

the free use, in

the course of implementing

be addressed

( Publications),

Revision of Indian Standards periodically and revised, when necessary and amendments, if any, Users of Indian Standards should ascertain that they are in are issued from time to time. Comments on this Indian Standard may be se;lt possession of the latest amendments or edition.
Indian

Standards

are reviewed

(0 BIS giving I)oc : No.

the folIowing

reference

:

BDC 33 ( 4481 )

Amendments Amend No.

Issued Since Publication Date of Issue Text Affected

BUREAU Headquarters: Manak Bhavan, 9 Bahadur Shah Zafar Telephones : 331 01 31, 331 13 75

OF

INDIAN

STANDARDS

Marg,

New Delhi

110002 Telegrams : Manaksanstha ( Common to a11 Offices ) Telephone

Regional Central

Offices: : Manak Bhavan, NEW DELHI 9 Bahadur 110002 Shah Zafar Marg

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BHOPAL. BHUBANESHWAR. JAlPUR. KANPUR. PATNA. l'rinted at l+;ntograph,
&mIndla