FINAL DRAFT UGANDA 
STANDARD  
  FDUS 1875  
First Edition  
2018-02- 12  
 
 Reference number 
FDUS 1875: 2018 
© UNBS 2018  
  
Wooden door shutters— Test methods  
 FDUS 1875:2018 
ii © UNBS 2018 – All rights reserved
 Compliance with this standard does not, of itself c onfer immunity from legal obligations 
A Uganda Standard does not purport to include all n ecessary provisions of a contract. Users are 
responsible for its correct application  
© UNBS 2018   
All rights reserved. Unless otherwise specified, no  part of this publication may be reproduced or util ised in any 
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permission from UNBS. 
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The Executive Director 
Uganda National Bureau of Standards 
P.O. Box 6329 
Kampala 
Uganda 
Tel: +256 417 333 250/1/2 
Fax: +256 414 286 123 
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  FDUS 1875:2018 
© UNBS 2018 – All rights reserved  iii
 Contents Page  
Foreword .......................................... ................................................... ................................................... ............. v  
1 General ......................................... ................................................... ................................................... .............. 1  
1.1 Tests ......................................... ................................................... ................................................... ............... 1  
1.2 General Precautions............................ ................................................... ................................................... ... 2 
2 Measurement of Dimensions and Squareness ........ ................................................... ................................. 2  
2.1 Procedure ..................................... ................................................... ................................................... ........... 2  
2.2 Measurement of Height ......................... ................................................... ................................................... . 2 
2.3 Measurement of Width .......................... ................................................... ................................................... . 2 
2.4 Measurement of Thickness ...................... ................................................... ................................................ 2  
2.5 Measurement Squareness ........................ ................................................... ................................................ 2  
3 Measurement of General Flatness ................. ................................................... ............................................. 3  
3.1 Procedure ..................................... ................................................... ................................................... ........... 3  
3.2 Measurement of Twist .......................... ................................................... ................................................... .. 3 
3.3 Measurement of Warping and Cupping ............ ................................................... ...................................... 3  
4 Local Planeness Test ............................ ................................................... ................................................... .... 4 
4.1 Procedure ..................................... ................................................... ................................................... ........... 4  
5 Impact Indentation Test ......................... ................................................... ................................................... ... 4 
5.1 Steel Ball Impact Tests. ...................... ................................................... ................................................... ... 4 
5.1 .2.Procedure .................................. ................................................... ................. Error! Bookmark not defined.  
6 Flexure Test .................................... ................................................... ................................................... ........... 5  
6.1 Procedure. .................................... ................................................... ................................................... ........... 5  
7 Edge Loading Test. .............................. ................................................... ................................................... ..... 5  
This part of the standard specifies a method of tes t to determine the deflections on door shutters 
due to load applied at the edges. ................. ................................................... ..................................... 5  
7.1 Procedure ..................................... ................................................... ................................................... ........... 5  
8 Shock Resistance Test. .......................... ................................................... ................................................... .. 5 
8.1 Soft and Light body impact test ............... ................................................... ................................................ 5  
8.1.2 Procedure ................................... ................................................... ................. Error! Bookmark not defined.  
8.2 Soft and Heavy Body Impact Test ............... ................................................... ............................................ 6  
8.2.1 Procedure ................................... ................................................... ................. Error! Bookmark not defined.  
9 Buckling Resistance Test ........................ ................................................... ................................................... . 6 
9.1 Procedure ..................................... ................................................... ................................................... ........... 7  
10 Slamming Test .................................. ................................................... ................................................... ....... 7  
10.1 Test I ....................................... ................................................... ................................................... ............... 7  
10.1.1 Procedure .................................. ................................................... ................ Error! Bookmark not defined.  
10.2 Test II ...................................... ................................................... ................................................... ............... 7  
10.2.1 Procedure .................................. ................................................... ................................................... ......... 7  
11 Misuse Test .................................... ................................................... ................................................... .......... 8  
11.1 Procedure .................................... ................................................... ................................................... .......... 8  FDUS 1875:2018 
iv © UNBS 2018 – All rights reserved
 12 Varying Humidity Test .......................... ................................................... ................................................... ...8 
12.1 Procedure .................................... ................................................... ................................................... ..........8  
13 End Immersion Test.............................. ................................................... ................................................... ...9 
13.1 Procedure .................................... ................................................... ................................................... ..........9  
14 Knife Test ..................................... ................................................... ................................................... .............9  
14.1 Procedure .................................... ................................................... ................................................... ..........9  
14.3 Teat for glue adhesive between core and adjoin ing veneers. ...................................... .........................9  
14.4 Procedure .................................... ................................................... ................................................... ..........9  
15 Glue Adhesion Test ............................. ................................................... ................................................... . 10  
15.1 Procedure .................................... ................................................... ................................................... ....... 10  
16 Screw Withdrawal Resistance Test................ ................................................... ........................................ 10  
16.1 Procedure .................................... ................................................... ................................................... ....... 10  
 FDUS 1875:2018 
© UNBS 2018 – All rights reserved  v
 Foreword 
Uganda National Bureau of Standards (UNBS) is a par astatal under the Ministry of Trade, Industry and 
Cooperatives established under Cap 327, of the Laws  of Uganda, as amended.  UNBS is mandated to co-
ordinate the elaboration of standards and is  
(a) a member of International Organisation for Stan dardisation (ISO) and  
(b) a contact point for the WHO/FAO Codex Alimentar ius Commission on Food Standards, and  
(c) the National Enquiry Point on TBT Agreement of the World Trade Organisation (WTO). 
The work of preparing Uganda Standards is carried o ut through Technical Committees. A Technical 
Committee is established to deliberate on standards  in a given field or area and consists of key stake holders 
including government, academia, consumer groups, pr ivate sector and other interested parties.  
Draft Uganda Standards adopted by the Technical Com mittee are widely circulated to stakeholders and th e 
general public for comments. The committee reviews the comments before recommending the draft standard s 
for approval and declaration as Uganda Standards by  the National Standards Council. 
The committee responsible for this document is Tech nical Committee UNBS/TC 12, Furniture .   FINAL DRAFT UGANDA STANDARD FDUS 1875 :2018 
 
1 © UNBS 2018  – All rights reserved
 Wooden door shutters — Test methods 
1 Scope 
This standard covers the various test methods which  shall be followed to subject the door shutters to evaluate 
their quality . 
2 Tests 
2.1 General 
2.1.1  The door shutters shall be subjected to the follow ing tests, in the order listed below: 
a) dimensions and squareness test 
b) general flatness test; 
c) local planeness test; 
d) impact indentation test; 
e) flexure test; 
f) edge loading test; 
g) shock resistance test; 
h) buckling resistance test; 
i) slamming test; 
j) misuse test; 
k) varying humidity test; 
l) end immersion test; 
m) knife test; 
n) glue adhesion test; and 
o) Screw withdrawal resistance test. 
2.1.2 It may be noted that while all tests on all types o f doors may not be necessary, only the required tes ts 
on different doors may be performed for performance  evaluation, which are given in the individual 
specification on door shutters. The door shutters f or the tests shall not be painted or varnished.  
2 © UNBS 2018 – All rights reserved
 2.2 Precautions 
2.2.1  The test specimens shall not have been exposed to a temperature below 4°C for 24 h immediately 
preceding the test and shall be free from all visib le moisture. The specimen shall be inspected and an y 
specimen with visible flaws shall be discarded. 
2.2.2  If any test specimen fails because of mechanical r eason, such as failure of testing equipment or 
Improper specimen preparation, it shall be discarde d and another specimen taken. 
3 Measurement of dimensions and squareness 
3.1 General 
This clause specifies a method for measuring the di mensions and the squareness of door shutters . 
3.2 Procedure 
3.2.1 Measurement of height 
Measure the height along the lines A-A and B-B (see  Figure 1) each of which is parallel to and 20 mm or  less 
from a longitudinal edge. The height shall be measu red with an accuracy of 1 mm. The measuring points shall 
be 20 mm ± 5 mm from the edges. It shall be measure d to an accuracy of 0.1 mm. 
3. 2.2 Measurement of width 
Measure the width along the lines C-C and D-D (see  Figure 1) each of which is parallel to and 20 mm or  less 
from a transverse edge. The width shall be measured  with an accuracy of 1 mm. 
NOTE In the case of a door shutter with rebated edg es, the dimension of height or width should be meas ured to the 
inner edges of the rebate. 
3.2.3 Measurement of thickness 
Measure the thickness at six points which are locat ed approximately 20 mm from the edges, at the middl e of 
the width of the door shutter and at each one-third  of the height (see Figure 1). The thickness shall be 
measured with an accuracy of 0.1 mm . 
3. 2.4 Measurement of squareness 
Determine the deviation from squareness of adjacent  edges of the door shutter at all the four corners of the 
door leaf with a square with arms 500 mm long (see Figure 2). The deviation from squareness shall be 
measured to an accuracy of 0.1 mm . 
 
 FDUS 1875:2018 
© UNBS 2018 – All rights reserved  3
 
 
 
 
  
4 Measurement of general flatness 
4.1 General 
This clause specifies a method for measuring the ge neral flatness of door shutters. 
4. 2 Procedure 
4. 2.1 Measurement of twist 
The door shutter is held freely in a vertical plane  or mounted vertically so that there is no external  restraint. 
Any three comers of this face determine a plane of reference. The deviation of the fourth corner is me asured 
with respect to this plane with a plumb bob or any other suitable device (see Figure 3). The measuring  points 
shall not be more than 20 mm from the edges. It sha ll be measured to an accuracy of 0.1 mm. 
4.2.2 Measurement of warping and cupping 
The door shutter is held as given in 3.2. Measureme nt(s) of warping and cupping on one of the faces of  the 
door shutters is measured with respect to straight lines parallel to each edge and located 20 mm or le ss from 
the edge. The distance of the face from these strai ght lines is measured (see Figure 2). The deviation  shall be 
measured to an accuracy of 0.1 mm.  
4 © UNBS 2018 – All rights reserved
 
  
  
The reference plane is defined by the three points P,, P, and 
P,. P, is also situated on this plane. The measurem ent of the distance P.-P’, (g) gives the value of twist . 
Figure 3 — Measurement of twist 
5 Local planeness test 
5.1 General 
This clause specifies a test method to ascertain th e general smoothness of the surface of the door shu tters. 
5.2 Procedure 
The door shutter shall be positioned or held freely  and in placed in a horizontal a convenient positio n. Squares 
of 200 mm x 200 mm shall be drawn, spread over the entire area of the shutter for measurement purposes . A 
suitable measuring device suitably fixed at the cen tre of a straight edge of 200 mm length shall be pl aced on 
the different squares on the face of the door shutt er. The depth at each point shall be measured to an  
accuracy of 0.05 mm. The procedure shall be repeate d for the other face. 
6 Impact indentation test 
6.1 General 
This clause specifies two tests to determine the im pact indentation on door shutters. 
6.2 Steel ball impact tests 
The door shutter shall be placed horizontally resti ng on a suitable frame equally on all the four edge s. A steel 
ball of about 50 mm diameter and weighing 500 g ±10  g, shall be allowed to fall freely from a height o f 750 
mm ±-5 mm at any randomly selected 10 different poi nts on both the surfaces of the door shutter leavin g 
distance of 75 mm from the edges. The depth of inde ntation shall be measured to an accuracy of 0.1 mm.  FDUS 1875:2018 
© UNBS 2018 – All rights reserved  5
 7 Flexure test 
7.1 General 
This clause specifies a test method for flexure res istance of door shutters. 
7.2 Procedure 
The door shutter shall be held firmly along one lon g edge and the adjacent short edge and it shall be ensured 
that the three fixed corners are in one horizontal plane. Loading shall be done on the top corner of t he door 
shutter 50 mm from the free edge, resulting deforma tion in the vertical plane of the door shutter. The  loading 
shall be done in steps of 100 N (10 kgf) up to a ma ximum of 500 N (50 kgf) and unloaded after 15 min i n the 
same steps. The deflection shall be measured initia lly and after 15 min with the load and finally afte r 3 min of 
the removal of the load. All deflections of the fre e corner shall be measured to an accuracy of 0.1 mm  with 
reference to the diagonally opposite fixed corner. 
8 Edge loading test 
8.1 General 
This clause specifies a test method to determine th e deflections on door shutters due to load applied at the 
edges . 
8.2 Procedure 
The door shutter shall be hung vertically, bearing or with 12 mm dia pivot supported at the top and bo ttom or 
hinged on one longitudinal edge. The test set up sh all be sufficiently rigid to withstand the test loa d without 
deflecting to an extent likely to impair jointing o r to impose bending stresses on the test specimen. If 
installation conditions are known, the specimen sha ll wherever practical, be installed to simulate the se.  
The door shall be opened at an angle of 45° or 90° and measurements taken at the lower corner of the d oor 
shutter, to the nearest 0.1 mm. The load shall be a pplied on the top of the other longitudinal edge pa rallel to 
the plane of the door shutter at a distance of 50 m m from the edge. The loading shall be done in steps  of not 
more than 200 N (20 kgf) at a time until a load of 1 000 N (100 kgf) is reached and kept constant for a period 
of 15 min. The deflection at the loaded edge, at th e end of 15 min and after 3 min after removal of th e load, 
measured to an accuracy of 0.1 mm, shall be recorde d. 
9 Shock resistance test 
9.1 General 
This clause specifies two tests to be carried out f or determining the resistance of door shutters to s hock.  
9.2 Soft and light body impact test    
The door shutter shall be hinged in a vertical plan e flush with a fixed frame. The rope with a leather  ball of 
approximately 200 mm in diameter and containing 50 N (5 kgf) of sand hung vertically by a rope require d for 
giving the shock. The rope with the leather ball sh all be tied on the central vertical line just above  the door. 
The length of the rope shall be such that the ball may strike the door at a point 200  mm above the bo ttom end 
on the vertical central line of the door (see Figur e 1). The ball shall be pulled away from the door t o a height of 
1.25 m from the plane of striking place and shall b e allowed to strike the door for twenty five times at the rate 
of 4 to 5 shocks/min. on which door of various size s can be mounted in a manner similar to their insta llation in 
practice. The frame shall be sufficiently rigid so that any deformation that occurs in the frame durin g testing 
will have negligible effect on the test results.  
6 © UNBS 2018 – All rights reserved
 9.3 Soft and heavy body impact test  
An arrangement for mounting the door shutter as spe cified in 2.1 shall be made. A spherical leather sa il cloth 
bag of approximately 350 mm in diameter is filled w ith sand ‘of apparent density approximately 1,500 k g/m³ 
(sand which passes through a sieve of aperture size  2 mm until it reaches a mass of 300 N (30 kgf). Th e bag 
shall be hung as a pendulum arrangement to strike t he door shutter at the level of the handle in the p osition 
shown, and hung in such a way that when at rest the  bag just touches the shutter (see Figure 2).  The 
spherical leather bag shall be pulled away from the  door to a height of 230 mm from the plane of strik ing place 
and the normally hung shutter (with hangings, fixin gs and fastenings) shall be given five impacts at t he handle 
level on both sides of the shutter.’ 
 
 
 
10 Buckling resistance test 
10.1 General 
This clause specifies test method to determine the resistance of door shutters to buckling . FDUS 1875:2018 
© UNBS 2018 – All rights reserved  7
 10.2 Procedure 
The door shutter shall be placed in a rigid rig and  fixed in a way similar to actual installation. The  door shutter 
shall be opened to an angle of 90 0  and secured at its top free corner to prevent any  lateral movement. A 
typical method of attachment of the load and its lo cation is shown in Figure 1 for guidance. A load of  400 N 
(40 kgf) is applied at 1000  mm from the bottom of the door at right angles to the plane of the door s hutter and 
in the direction of opening, in increments of 100 N  each. Incremental load is applied only after stabi lization of 
the deformation created by the previous loading. Th e deformation at the lower free corner is measured to an 
accuracy of 1 mm, 5 min after the application of th e load and 15 min after unloading . 
 
11 Slamming test 
11.1 General 
This clause specifies two tests to determine the ef fect on door shutters due to slamming actions. Any one of 
the tests shall be followed.  
11.2 Test I 
Suitable fixture shall be made to hold the door shu tter horizontally flat and hinged on one long edge and 
resting freely on a wooden rail 50 mm from the othe r long edge. The door shutter shall be placed in a 
horizontal position suitably hinged at three equidi stant places or at the discretion of the manufactur er on one 
of the long edges. The other edge is lifted up so a s to form an angle of not less than 30 0“ at the hinged edge 
and allowed to drop under its own weight, 50 times on the rail at the rate of four to five drops per m inute. 
11.2 Test II 
The door shutter shall be hung with three hinges ve rtically on one long edge or as per manufacturer’s 
instructions in a suitable frame. Suitable arrangem ent to apply a force of 150 N (15 kgf) to the shutt er at not 
more than 150 mm from the locking edge of the shutt er shall be made. The force shall act perpendicular ly to 
the plane of the frame throughout the closing movem ent (see Figure l).The door shutter shall be opened  at an 
angle of 60 ± 50’ and shall be made to close for hundred times by t he continuous application of a force of 150 
N which ceases to act at the moment of impact.  
8 © UNBS 2018 – All rights reserved
 
 
12 Misuse test 
12.1 General 
This clause specifies a test method to determine th e resistance of door shutters to misuse . 
12.2 Procedure 
Suitable frame to hold the door shutter vertically in a manner similar to its installation in practice  shall be 
made. The door shutter shall be hinged on one long edge to the frame. A hard wood slip such as Laurel,  Sal, 
Bijasal of 50 mm x 50 mm and of thickness, adequate  to match the thickness of the door shutter shall b e 
placed vertically at the bottom of the hinged stile  of the frame in such a way as to keep the door aja r at 70 0 5’. 
The force is applied progressively to the handle or  equivalent position and at right angles to the pla ne of the 
frame in the direction of closing until it reaches 200 N (20 kgf) (see Figure 1). 
 
 
 
 
13 Varying humidity test 
13.1 General 
This clause specifies method which is to be used to  test the behavior, under humidity variations, of d oor 
shutters placed in successive uniform climates.  
13.2 Procedure 
The door shutter shall be placed in a conditioning chamber at a temperature 27°C ± 2’C, and humidity 
maintained at 30 % ± 5 % for one week. The height, width, thickness as per Clause 3 of this standard, general 
flatness as per Clause 4 of this standard, local pl aneness as per Clause 5 of this standard and diagon al of the FDUS 1875:2018 
© UNBS 2018 – All rights reserved  9
 door shutter shall be measured. Then the humidity s hall be raised to 85 % ± 5 % and the door shutter s hall 
remain there again for one week. The test may be st opped before the end of the period specified, if tw o 
successive measurements of general flatness taken a t two-day interval, do not differ by more than 1 %.  
The changes in the above dimensions shall be noted.  After this, the door shutter shall be kept inside the 
chamber for one week at a humidity level of 30 % ± 5 %. The dimensions shall be measured again after t he 
end of the period and the extent of return to the o riginal sizes shall be calculated. General planenes s of the 
door shutter shall be measured as per Clause 5 of t his standard. 
14 End immersion test 
14.1 General 
This clause specifies a test method for  resistance  of door shutters to immersion in water. 
14.2 Procedure 
The door shutter shall be immersed to a minimum dep th of 300 mm in water at ambient temperature for 24  h 
and then allowed to dry for 24 h at ambient tempera ture. This cycle shall be repeated eight times. The  door 
shutter shall be examined for any delamination in t he immersed portion of the shutter . 
15 Knife test 
15.1 General 
This clause specifies test method for testing the g lue adhesion strength of door shutters with a knife . 
15.2 Procedure 
The type of knife required to be used in the test i s given in Figure 1. It may be made from a file. Th e cutting 
edge should be kept chisel sharp. The test shall be  carried out on a stout table to which is screwed a  wooden 
batten against which the edge of the test specimen is placed as indicated in Figure 2. The knife is in serted 
with its cutting edge parallel to the grain of the outer veneer and worked into, or if possible, along  a glue line 
and the veneer is prized upward. It is essential th at the knife be firmly guided along the glue line. 
15.3 Teat for glue adhesive between core and adjoin ing veneers 
15.3. 1 General 
To test the glue adhesion between the core and the adjoining veneers, the qualitative test as given in  3.2 may 
be used. 
15.3.2 Procedure 
The central core strips shall be forcibly separated  from its adjacent veneer by a chisel inserted in t he bond line 
and affecting the separation in the direction of th e core strips. The capacity of the bond should be j udged by 
the relative amount of wood fibres left by the vene er and the core strips. Force shall be needed to ef fect the 
separation. The grading should be assessed on the b asis of the appearance of the failure.  
10 © UNBS 2018 – All rights reserved
 
 
16 Glue adhesion test 
16.1 General 
This clause specifies a test method to assess the g lue adhesion of door shutters . 
16.2 Procedure 
Two square sections, 150 mm x 150 mm shall be cut f rom the corners of the door shutter. These corner 
sections, as cut from the door shutter, shall be su bmerged in a pan of water at ambient temperature, c are 
being taken that the pieces do not touch the bottom  of the pan. The water shall then be brought to the  boiling 
temperature and maintained at this temperature for 4 h and then dried in a chamber at 27 °C ± 2 °C and  
relative humidity of 65 % ± 5 % for 24 h. At the en d of the drying period the samples shall be examine d for 
delamination. Glue lines in all the four exposed ed ges of the plywood on both faces of a specimen and the 
glue lines between the plywood faces and the stile and rail shall be examined for delamination. 
17 Screw withdrawal resistance test 
17.1 General 
This clause specifies a test method to determine th e screw withdrawal resistance of door shutters. 
17.2 Procedure 
This test shall be carried out on three test specim ens of size 150 mm x 75 mm cut along the longitudin al edge 
of upper/lower half portion of the door shutter, us ing a suitable test equipment having an arrangement  to pull 
the screws fixed on the specimen so as to measure t he maximum load required for complete withdrawal. P rior 
to testing, the test specimen shall be conditioned at 27 °C ± 2 °C and at relative humidity of 65 % ± 5 % for 
one week. Two prebores of 3-mm diameter shall be ma de along the stile at an interval of 50 mm on the f ace 
and along the edges of the specimen. Screws of size  No. 8 and 50 mm length shall be fixed at these poi nts to 
a depth of 25 mm. The specimen shall then be placed  on the test equipment and load applied at the spec ified FDUS 1875:2018 
© UNBS 2018 – All rights reserved  11
 rate of 2 mm per min for withdrawal of one screw at  a time. The maximum load required for complete 
withdrawal shall be noted in each case. FDUS 1875: 2018 
13 © UNBS 2018  – All rights reserved
 Certification marking 
Products that conform to Uganda standards may be ma rked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below .  
The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those lic ensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conj unction with the relevant Uganda Standard. The 
presence of this mark on a product or in relation t o a product is an assurance that the goods comply w ith the 
requirements of that standard under a system of sup ervision, control and testing in accordance with th e 
certification mark scheme of the Uganda National Bu reau of Standards. UNBS marked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda  
National Bureau of Standards.  
 
 FDUS 1875: 2018  
 
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