Draft Standard for Technical Commitee Meeting  CDC 11 ( 303) DTZS 
         
                                                                                                     
   
DRAFT TANZANIA STANDARD  
 
 
  
 
 
 
 
 
 
 
Spring mattress — Specification  
  
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
             
  
  
              TANZANIA BUREAU OF STANDARDS   
 
  
 
 
 
© TBS 2021 All right Reserved                                                                 First Edition 2021                                                        
Draft Standard for Technical Commitee Meeting   
  
0 Foreword  
  
 
This Draft Tanzania Standard is being developed by Plastic and Plastic Products Technical 
Committee under supervision of the Chemical Division Standards Committee and it is in accordance 
with the procedures of the Bureau 
 
This Draft Tanzania Standard is the second edition of spring mattress – Specification. 
  
This Draft Tanzania Standard has been prepared with assistance drawn from the following 
documents: 
 
BS 3173: 1996, Specification for spring units for mattresses, published by British Standards  
Institution   
  
BS 1877: Part 10: 2011, Specification for mattresses and bumpers for children's cots,  
perambulators and similar domestic articles,  published by British Standards Institution  
Various specifications of local spring mattresses manufacturing companies   
 
TZS 360: 1996, Domestic Mattresses-Flexible polyurethane foam - Specification, published 
by Tanzania Bureau of Standards   
 
 BS 4637: 1970, Specification for carbon steel wire for coiled springs (bedding and seating), 
published by British Standards Institution   
  
BS 3173:1996 Specification for spring units for mattresses,  published by British Standards  
Institution  
 
              BS 1425-1:1999 Cleanliness of fillings and stuffing, upholstery and other domestic articles 
Part 1: Specification for fillings and stuffings other than feather and/or down,  published by 
British Standards Institution  
 
 
             SANS 1401-10:2004 Specification for woven cotton and similar household fabrics and articles 
Part 10: Cotton ticking,  published by South African Bureau of Standards 
 
SANS 902:1971 Specification for hessian cloth,  published by South African Bureau of Standards 
  
The assistance obtained from the above source is hereby acknowledged with thanks. 
 
For the purpose of deciding whether a particular requirement of this Tanzania Standard is complied 
with, the final value observed or calculated, expressing the result of a test or analysis shall be 
rounded off in accordance with TZS 4 . 
 
 
  Draft Standard for Technical Commitee Meeting   
  
 
DRAFT TANZANIA STANDARD                      TBS/CDC 11 (303) DTZS 
 
 
 
Spring mattress — Specification    
 
  
1 Scope   
This Draft Tanzania Standard specifies requirements, sampling and test methods of spring mattresses 
for general usage.   
2 Normative references  
The following documents, in whole or in part, are normatively referenced in this document and are 
indispensable for its application. For dated references, only the edition cited applies. For undated 
references, the latest edition of the referenced document (including any amendments) applies.” 
     
TZS 4, Rounding off numerical values  
  
TZS 20/ISO 13934-2, Textiles - Tensile properties of fabrics — Part 2: Determination of 
maximum force using the grab method 
 
TZS 22/ ISO 13934-1, Textile - Tensile properties of fabrics - Part 1: Determination of 
maximum force and elongation at maximum force using the strip method 
 
TZS 43/ ISO 105-C10, Methods for the determination of colour fastness of textile Materials  
  to washing 
  
TZS 138/ ISO 105-D01, Method for determination of colour fastness of textile materials  
 to dry   cleaning 
 
TZS 359, Methods of test and sampling for Flexible polyurethane foam 
 
TZS 360, Flexible polyurethane foam mattresses — Specification  
 
BS EN 71-3, Safety of toys; Part 3: Migration of certain elements  
 
ISO 11130, Corrosion of metals and alloys — Alternate immersion test in salt solution 
 
BS 4637, Specification for carbon steel wire for coiled springs (bedding and seating)  
 
TZS 21, Textiles – Woven or knitted fabrics – Determination of mass per unit length and per 
unit area.  
 
             
 
  Draft Standard for Technical Commitee Meeting   
  
3 Terms and definitions  
For the purpose of this Draft Tanzania Standard, the following definitions shall apply:  
3.1 basic filling 
the filling adjacent to the spring unit 
 
3.2 bursting strength 
the force required to rupture a fabric by distending it with pressure applied at right angles to the plane 
of the fabric 
 
3.3 breaking strength 
the maximum load (or force) supported by a specimen in a tensile test carried to rupture 
 
3.4 core  
central part of spring mattress that provides support to the mattress, with the material being made of 
springs.  
 
3.5 defective 
a spring mattress that fails in one or more respects to comply with the appropriate requirements of the 
specification  
 
3.6 spring unit   
unit made up of either open coil or pocketed springs and the connecting elements between them 
including boarder wire.  
  
3.7 open coil spring   
spring mattress in which the springs are not enclosed in pockets but connected together by other 
suitable means 
  
3.8 pocketed spring   
spring mattress in which the springs are enclosed inside pockets and the pockets are connected 
together by suitable means.  
  
3.9 insulation   
suitable insulating material on both sides of the spring unit to prevent the spring from protruding  
  
3.10 padding   
any suitable material which can give comfort to the user  
  
3.11 tick  
a suitable outer cover that provides a comforting top layer of the mattress  
 
3.12 warp 
yarns / threads lying lengthways in a fabric as woven 
 
3.13 weft 
yarns / threads lying width ways in a fabric as woven (at right angles to the warp) 
 
3.14 yarn 
a generic term for a continuous strand of textile fibres or filaments without twisting, suitable for plying, 
knitting, braiding, weaving or otherwise intertwining to form a textile end product 
  Draft Standard for Technical Commitee Meeting   
   
4 Requirements  
4.1 General requirement  
4.1.1 Spring mattresses shall be manufactured in accordance with the best practice known in the 
manufacturing industry and shall be clean and free from defects in material and workmanship. 
Monofilament sewing thread shall not be used.  
 
4.1.2 Each finished spring unit shall be regular in shape and size and when measured with the unit 
standing on a flat surface, the edges shall stand vertically, forming a right cylinder, with no point on a 
vertical side varying by more than about 10 mm from the sides of the right cylinder. All wire ends shall 
face inwards. 
 
4.1.3 Each spring mattress shall be a rectangular unit of uniform thickness, length, and width, with 
straight borders and a neat finish. Unless made of an intrinsically corrosion-resistant metal, all metal 
parts of mattress shall have an acceptable corrosion-resistant finish. All sewing shall be securely and 
neatly finished off. 
 
4.1.4 The material used for edge frames shall be high carbon steel strip of width at least 5 mm and 
thickness at least 1.60 mm or high carbon steel wire of diameter at least 3.75 mm. 
 
4.1.5 The spring unit used shall be tempered with heat or electricity. 
 
4.1.6 The spring mattresses shall have a prebuilt border (see 4.2.6) that covers the sides and ends of 
the mattresses. 
 
4.1.7 All metal parts shall show no evidence of corrosion when assed in accordance with ISO 11130 
 
4.1.8 The basic filling of spring mattresses shall consist of needled coir or sisal secured to a backing 
of polypropylene fabric, or of polyurethane foam, or of layers of these (or other acceptable material). It 
shall have a mass of at least 1520 g/m2 of sleeping surface when determined in accordance with 
Annex E. 
 
4.1.9 The bearing (sleeping) surfaces of the spring unit of mattresses shall be covered by an insulator 
unit to which the basic filling is securely stapled, or is so securely attached as to seal off the end 
openings of the spring. 
 
4.1.10 The surface filling of a spring mattress shall consist of cotton felt (or other acceptable material) 
or of polyurethane foam or of layers of these and the mass per square meter of sleeping surface shall 
be determined in accordance with Annex E. 
 
 
4.2 Specific requirement  
    
4.2.1 Spring mattresses shall have a minimum thickness of 15 cm and width and length allowed shall 
comply with TZS 360 (see clause 2). However, the width and length may be customized.  
4.2.2 When a spring mattress is subjected to endurance test in accordance with Annex A, there shall 
be no significant failure of any part (internal or external) of the mattress that could affect its fitness for 
use and the loss in height at any of the points tested shall not exceed 5 %. 
 
4.2.3 ventilators If fitted, ventilators shall be made of plastics material or any other suitable material 
and shall not contain antimony, arsenic, barium, cadmium, chromium, lead, selenium, mercury or 
any soluble compound of any of these elements, exceeding the amounts given in table 1. 
Ventilators shall not be positioned on the sleeping surface of a mattress.  
 Draft Standard for Technical Commitee Meeting   
 4.2.4 Ventilators shall conform to the specific requirements given in Table 1 when tested in 
accordance with the methods prescribed therein. 
Table 1 — specific requirements, limit of heavy metals for ventilators 
SL. No Characteristic Requirement Test method 
i) Antimony, mg/kg, max 60 Clause 8.2 of BS EN 
71-3: 1995 ii) Arsenic, mg/kg, max 25 
iii) Barium, mg/kg, max 1000 
iv) Cadmium, mg/kg, max 75 
v) Chromium, mg/kg, max 60 
vi) Lead, mg/kg, max 90 
vii) Mercury, mg/kg, max 60 
viii) Selenium, mg/kg, max 500 
 
4.2.5 The cover of spring mattresses shall be of a woven ticking, or a knitted ticking and shall conform 
to the specific requirements given in Table 2 when tested in accordance with the methods prescribed 
therein. 
Table 2 - specific requirements for  ticking 
 
SL. No Characteristic Requirement Test method 
i) Breaking strength  
( woven ticking)   N, min. Warp 980 TZS 22/ ISO 13934-1 
Weft 490 
ii) Bursting strength (knitted  ticking), KPa,min. 700 TZS 20/ ISO 13934-2 
iii) Colour fastness to 
washing  Change in colour, rating, 
min.  
 
              4 TZS 43/ ISO105-C10 
Staining of transfer 
cloths, rating, min 
iv) Colour fastness to 
dry-cleaning Change in colour, rating, 
min.  
 
              4 TZS 138/ ISO 105-
D01 
Staining of transfer 
cloths, rating, min 
v) Flammability To comply with 
flammability 
requirements 
given in 4.3.5.1  Annex C 
 
4.2.6 Prebuilt borders shall be firm and shall consist of one or more layers of wadding, polypropylene 
fabric, or other acceptable material (of total thickness in all cases, at least 5 mm) stitched to a backing 
of Hessian or other material of at least equal strength and of acceptable quality 
 
4.2.7 Hessian used as the backing of the basic filling and for prebuilt borders shall conform to the 
specific requirements given in Table 3 when tested in accordance with the methods prescribed therein 
 
 
 
 
 Draft Standard for Technical Commitee Meeting   
  
 
Table 3 - specific requirements for  hessian fabric  
 
SL. No Characteristic Requirement Test method 
i) Breaking strength  N, min. Warp 310 TZS 22/ISO 13934-1 
Weft 220 
ii) Threads per 10 cm, min. Warp 27 TZS 20/ ISO 13934-2 
Weft 21 
iii) Mass per unit area,  g/m2 , min. 155 
 Annex E 
 
 
4.2.8 Polypropylene fabric used as the backing of the basic filling shall be of split film polypropylene 
yarns. The weave shall be plain and the fabric shall conform to the specific requirements given in 
Table 4 when tested in accordance with the methods prescribed therein.  
 
Table 4 - specific requirements for  polypropylene fabric  
 
SL. No Characteristic Requirement Test method 
i) Threads per 10 cm, min. Warp 27 TZS 20/ ISO 13934-2 
Weft 21 
ii) Mass per unit area,  g/m2 , min. 155 
 TZS 21 
 
 
4.3 Construction and material  requirements   
 
4.3.1 Padding   
It shall consist of a layer of a minimum of 25 mm around the core in a composite structure with the 
sole purpose of equalizing the pressure on the human body.  
4.3.2 Ticking  
The tick can be fixed to the mattress by means of stitching or by tapes running through the mattress 
(tufting). Sometimes the tick is not fixed, and can be removed from the mattress by customer.  
 
4.3.3 Spring unit   
 
4.3.3.1 Unit made up of either open coil or pocketed springs , knotted-coil construction shall either 
consist of transverse rows of coils connected by helical running at right angles of the long axis of the 
unit in such a manner as to prevent a free hinge action, each unit to have helical or clipped border on 
both top and bottom perimeters with 4 mm minimum oil tempered border wire, where the corners of 
this unit have 63.5 mm or pocketed spring system in which the springs are enclosed inside pockets 
and the pockets are connected together by suitable means.  
4.3.3.2 Springs distributed at the minimum densities given in clause 4.3.3.6  shall be made from wire 
with a nominal diameter not less than 1.9 mm. For springs distributed at greater densities than those 
given in clause 4.3.3.6  the minimum diameter of the wire shall be reduced by one standard metric size Draft Standard for Technical Commitee Meeting   
 as specified in BS 4637 for each 25 % increase in the spring density. The spring shall have the 
minimum height of 10 cm with at least 4 turns or convolutions.   
4.3.3.3 Each finished spring unit shall be regular in shape and size and when measured with the unit 
standing on a flat surface, the edges shall stand vertically, forming a right cylinder, with no point on 
the vertical side varying by more than 10 mm from the sides of the right cylinder. The size of the inner 
spring shall have the minimum of 90 mm when tested according to annex D.   
4.3.3.4 All wire ends shall face inwards and helical wires shall be clenched or crimped to ensure 
secure fixing.   
NOTE 1 — The overall dimensions of the finished spring unit together with any ancillary components 
and methods of construction should be agreed between the purchaser and the supplier.  
  
4.3.3.5 Number of springs    
4.3.3.5.1 Each spring unit shall contain not less than the number of springs specified for the 
appropriate mattress size in tables 5 and 6.   
 Draft Standard for Technical Commitee  Meeting                                                                                                            
  
  
Table 5 - Mattresses for adults' use  
  
Nominal unit size (mm)  Minimum number of springs  
Open coil  Pocketed  
900 X 1900   192 300   
1000 X 2000   225   338   
1350 X 1900   288   450   
1500 X 2000   325   520   
  
The spring density for units of sizes other than those listed in tables 5 and 6 shall be at least the 
value shown in table 7.   
  
Table 6 - Mattresses for children's use  
  
Nominal unit size (mm)  Minimum number of springs  
Open coil  Pocketed  
540 X1150   54   105   
690  X 1300   88   153   
  
4.3.3.6 The spring density for units of sizes other than those listed in tables 5 and 6 shall be at least 
the value shown in table 7.  
  
NOTE 2 — The values shown in table 7 are the minimum spring densities resulting from   
  
Table 7 - Minimum spring density for units of other sizes  
  
Use  Minimum number of springs  
Open coil spring density 
(springs/m2)  Pocketed spring density 
(springs/m2)  
Adults  108  169  
Children  87  169  
  
4.3.4  Steel Springs    
  
4.3.4.1 The whole of the spring unit, including vertical springs and where applicable the helical wire 
used in lacing the springs together, shall be made from wire conforming to BS 4637.  
  
4.3.5  Flammability test    
4.3.5.1 No foam specimen shall burn for 3 or more minutes nor shall burn beyond 75 mm gauge line 
if is tested as per Annex C.  
5 Sampling   
5.1 Representative samples shall be taken randomly from the factory, market or elsewhere and 
tested for compliance with the standard.  Draft Standard for Technical Commitee  Meeting                                                                                                            
  
 6 Packing and marking  
6.1 Packing  
6.1.1 Each mattress shall be packed in a suitable transparent material and in case; plastics 
coverings are used as packaging for a mattress, the plastic cover shall be conspicuously marked 
with a warning to the effect that the covering should be kept away from children.   
 
NOTE 3 - An example of suitable wording is as follows: To avoid danger of suffocation, remove 
these plastics cover before using mattress. The cover should then be destroyed or kept away from 
children.  
6.1.2  Plastics used for packaging shall be not less than 30 microns thick   
  
6.2  Marking  
  
6.2.1 Spring Mattress shall be indelibly and legibly marked in the outer upper waist of the mattress 
or a label attached on it, with the following descriptions:  
  
a) the words “spring mattress, 
b) Size range, name and type of the 
product,  
c) Registered trade name of the product, 
d) The nominal width and length,  
e) Name or mark of the manufacturer, 
f) Batch number and date of manufacture, 
g) Country of origin, 
  
  
NOTE - The TBS Certification Mark may be used by manufacturers only under license from TBS. 
Particulars of conditions under which the licenses are granted may be obtained from TBS offices.  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
  Draft Standard for Technical Commitee  Meeting                                                                                                            
  
 Annex A   
(normative)   
Method of test for spring units  
A.1 Principle  
A flat, circular metal-faced indentor is repeatedly applied to the surface of a section of a spring unit.  
NOTE - The hardness or softness of the spring unit is not determined and, therefore, no limits are specified for 
the strength (or load rating) of the springs. The test is designed to ensure durability of the spring unit, and that 
its initial height will not be unduly reduced in use. This Tanzania Standard is performance based therefore the 
test of the spring unit is done to ensure the durability of the spring and not the strength of the spring (or load 
rating) unit.  
A.2 Apparatus  
The apparatus shall comprise a test indentor, means for raising and lowering the indentor, and a 
measuring disc.   
The indentor shall be mounted centrally at the base of a vertical square shaft. The test indentor 
shall be as shown in figure A.1 and shall be of diameter (200 ± 10) mm with a minimum thickness of 
25 mm and a lower edge radius of (10 ± 1) mm. The test surface shall be smooth, rigid and flat.  
The total mass of the indentor plus vertical square shaft (including any fixings) plus, if necessary, a 
suitable weight shall be 35 kg ± 0.5 %.  
The measuring disc shall be as shown in figure A.2. The disc shall have a diameter of (100 ± 1) mm 
with no edge radius, a smooth, rigid and flat surface, and have a mass of (300 ± 10) g.  
The disc shall be marked in four orthogonal positions, both on the face and at the edges. These 
positions shall be marked with the letters A, B, C and D or similar to enable the measurements to be 
taken at identical positions.  
NOTE - A suitable apparatus is described in annex B.  
A.3 Preparation of test sample  
The test sample shall be prepared to a size as near as practicable to 900 mm 3 900 mm. Where the 
actual spring unit is shorter than the test sample size in any direction, then that dimension shall be 
the test size in that direction.  
A.4 Procedure   
A.4.1 Initial height measurements   
Place the test sample on a rigid, flat, smooth surfaced  platform. Place the measuring disc at the 
geometric centre of the top of the test sample. Mark the test sample at each of the four positions 
indicated on the measuring disc, as shown in figure A.2. Record the distance between the bottom of 
the measuring disc and the surface of the platform for all four positions.  
  
  Draft Standard for Technical Commitee  Meeting                                                                                                            
  
 A.4.2 Performance test   
Place the test specimen centrally beneath the test indentor and prevent it from moving horizontally 
during the test. Release the test indentor from the drive mechanism and apply its total mass to the 
sample. Position the drive mechanism at its bottom position. Lock the indentor to the drive 
mechanism. If the distance between the bottom of the test indentor and the platform is less than 20 
mm reset the drive mechanism to give a 20 mm clearance. Apply 5000 cycles at a rate of (60 ± 1) 
cycles/min.  
A.4.3 Final height measurements   
After completion of the test and removal of the indentor, re-measure the height of the test sample at 
each of the four positions indicated on the measuring disc. Ensure that the disc is placed in an 
identical position to that used for the initial measurements as in A.4.1.  
A.4.4 Final examination   
Record breakages or any other damage to the springs or connecting materials.  
A.4.5 Calculation of results   
Express the difference between the initial height measurements and the final height measurements 
as a percentage of the initial measurement for each of the four positions.  
  
  
  
  
  
  
  
 
  
  
  
  
  
Draft Standard for Technical Commitee  Meeting                                                                                                            
  
  
  
  
  
  
  
  
Draft Standard for Technical Commitee  Meeting                                                                                                            
  
 Annex B  
 (informative)   
Apparatus for testing of spring units  
B.1 The apparatus should have a base plate of approximately 1000 mm3 1000 mm. A suitable 
apparatus is shown in figures B.1, B.2 and B.3. The shaft should be mounted in bearings or rollers 
to enable it to move up and down freely. A suitable clamp should be attached to this shaft for 
connecting it to the driving rod, one end of which should be connected to a crank of stroke length 
(170 ± 10) mm. The crankshaft should be driven at a rate of (60 ± 1) r/min.   
NOTE — A method of providing power for the drive is by means of an electric motor of the reduction gear 
type. (A motor of 2.2 kW rating is recommended.)   
 
  
  
  
Draft Standard for Technical Commitee  Meeting                                                                                                            
  
  
  
  
  
  
 
  
 
Draft Standard for Technical Commitee  Meeting                                                                                                            
  
 Annex C   
(normative)   
Flammability   
C.1 Apparatus   
    
An apparatus as shown  schematically in Figure C.1 and consisting of a heat-resistant glass tube 
(chimney) in which a test specimen can be mounted, the base of the tube being connected to 
metered supplies of oxygen and nitrogen.  The glass tube shall have a diameter of at least 75 mm 
and a height of at least 450 mm, and shall have at its base a bed of glass beads (or other inert 
particles) that will mix and distribute the incoming gases.  The tube shall also contain a clamp that is 
capable of holding a test specimen (vertically) that the top of the specimen is at least 100 mm below 
the top of the tube.  
    
The oxygen and nitrogen used shall be of commercial grade (or better) and shall be supplied to the 
base of the glass tube through individual metering devices that enable the volumetric flow of each 
gas to be measured with an accuracy of 1 % or better.  
  
C.2 Test specimens    
  
From the appropriate slab cut five specimens each of size 12.5 + 0.5 mm x 12.5 + 0.5 mm x 130 
mm and draw a gauge line across each specimen 75 mm from the end that is to be positioned 
uppermost of the apparatus.  
  
C.3 Procedure    
    
Clamp a test specimen in the holder of the apparatus so that it is held vertically in the centre of the 
glass chimney.  Open the valves of the gas cylinders and adjust the flow so that the oxygen content 
of the gas mixture is 20 + 0.2  % and that the flow rate up the glass chimney (as calculated from the 
volumetric flow rate divided by the cross-sectional area of the chimney) is 40 + 10 % mm/s.  Allow 
the gas to flow for at least 30 s and then, using a small gas flame at the end of a tube, ignite the test 
specimen so that the whole of the upper surface is burning.  Note whether the specimen burns for 3 
min or longer and if not, whether or not the specimen has burned to below the 75 mm gauge line.  
Repeat the test with the remaining four specimens.  
  
  
Figure C.1 — General arrangement of flammability test apparatus   
 
  
  
   
Draft Standard for Technical Commitee  Meeting                                                                                                            
  
  
Annex D   
(normative)   
Dimensions   
D.1 Apparatus   
D.1.1 Metre rule   
  
A steel rule graduated in millimetres and accurate to 1 mm (or better).  
  
D.1.2 Micrometer   
  
A micrometer accurate to 0.01 mm (or better) with a presser foot of area at least 6.5 cm and 
capable of exerting a pressure of 100 + 10 Pa.  
  
D.2 Procedure    
  
Measure the dimensions of each sample (using the steel rule for dimensions greater than 30 mm 
and the micrometer for dimensions not exceeding 30 mm).  
  
  Draft Standard for Technical Commitee Meeting   
 Annex E  
(Normative)   
Test method for endurance 
F.1 Apparatus 
 
A compression apparatus capable of cyclically compressing (between parallel platens) the 
central part of the complete mattress to 67 % of its free height and then releasing it, at a rate of 
60 ± 5 cycles/minute. The apparatus shall have a lower platen large enough to support the 
whole mattress, and an upper compressing platen with a corrugated contact surface of the size 
and shape shown in Figure F.1. The specified compression shall be measured at the positions 
of maximum compression caused by the corrugated platen. 
 
F.2 Preparation of test specimens 
 
a) Place the mattress to be tested and taken in accordance with 5.1, on a solid plane horizontal 
base for a period of at least 12 h. 
 
b) Place a flat steel pressure plate (of diameter 300 ± 2 mm and mass 2 ± 0.2 kg) on each of 
the six measurement positions (in turn) shown in Figure F.2, and measure (to an accuracy of ± 
2 mm) the height of the mattress at each of these positions. Ensure that the pressure plate is 
lowered slowly and without shock on to each of the measurement positions, and that each 
measurement is taken at least 10 s after application of the pressure plate. 
 
F.3 Procedure 
 
Position the upper platen of the apparatus with its longitudinal axis along the longitudinal axis of 
the mattress and its centre vertically above the midpoint, 0, of the measurement positions (see 
Figure F.2), secure the mattress against horizontal movement, and operate the apparatus for 
60 000 compression cycles. Allow the mattress to recover for at least 12 h, again measure the 
height as described in F.2 (b), and calculate (for each of the six points) the loss in height as a 
percentage of the original height. Cut the mattress open and examine for compliance with 4.2.2 
 
 Draft Standard for Technical Commitee Meeting   
  
 
Figure F.1 - compressing platen for endurance test 
 
                                                                                                               Dimensions in millimetres 
 
 
 
 
 
 
 
  
Draft Standard for Technical Commitee Meeting   
  
 
Figure F.2 -Measurement positions for endurance test