SIST EN 14035-25:2006
(Main)Fireworks - Part 25: Party Poppers - Specification and test methods
Fireworks - Part 25: Party Poppers - Specification and test methods
This European Standard specifies requirements for the construction, performance, primary packaging and labelling of party poppers and the corresponding test methods. It is applicable to fireworks which are classified as party poppers in category 1 of EN 14035-2 and which are contained in a primary pack.
It is applicable to party poppers which contain up to 10 mg of pyrotechnic composition that is based on potassium chlorate and red phosphorous.
It is not applicable to party poppers containing pyrotechnic composition that includes any of the following substances:
arsenic or arsenic compounds;
mixtures containing a mass fraction of chlorates greater than 80 percent;
mixtures of chlorates with metals;
mixtures of chlorates with potassium hexacyanoferrate(II);
mixtures of chlorates with sulfur;
mixtures of chlorates with sulfides;
lead or lead compounds;
mercury compounds;
white phosphorus;
picrates or picric acid;
potassium chlorate with a mass fraction of bromates greater than 0,15 percent;
sulfur with an acidity, expressed in mass fraction of sulphuric acid, greater than 0,002 percent;
zirconium with a particle size of less than 40 mm.
NOTE In EN 14035-2, party poppers are classified as follows:
- brief description: device operated by a pull-string with an abrasive surface in sliding contact with a friction-sensitive pyrotechnic composition and designed to be held in the hand;
- principal effects: report, with ejection of streamers and/or confetti.
Schemes for type testing of party poppers and batch testing of party poppers are specified in annex A and annex B respectively.
Feuerwerkskörper - Teil 25: Party-Knaller - Anforderungen und Prüfverfahren
Artifices de divertissement - Partie 25 : Party-Poppers - Spécifications et méthodes d'essai
La présente norme européenne spécifie les exigences de construction, performance, conditionnement et étiquetage des party-poppers, ainsi que les méthodes d’essai correspondantes. Elle s’applique aux artifices de divertissement classés comme party-poppers de catégorie 1 dans l’EN 14035 2 et qui sont contenus dans un emballage primaire.
Elle s’applique aux party-poppers contenant jusqu’a 10 mg de composition pyrotechnique de chlorate de potassium et de phosphore rouge.
Elle ne s’applique pas aux party-poppers dont la composition comprend l’une des substances suivantes :
- arsenic ou composés d’arsenic ;
- mélanges contenant une fraction en masse de chlorates supérieure a 80 % ;
- mélanges de chlorates et de métaux ;
- mélanges de chlorates et d’hexacyanoferrate (II) de potassium ;
- mélanges de chlorates et de soufre ;
- mélanges de chlorates et de sulfures ;
- plomb ou composés de plomb ;
- composés de mercure ;
- phosphore blanc ;
- picrates ou acide picrique ;
- chlorate de potassium contenant une fraction en masse de bromates supérieure a 0,15 % ;
- soufre présentant une acidité, exprimée en fraction de masse d’acide sulfurique supérieure a 0,002 % ;
- zirconium ayant une taille de particule inférieure a 40 mm.
NOTE Dans l’EN 14035-2, les party-poppers sont classés comme suit :
- description abrégée : dispositif actionné par une ficelle-tirette, avec une surface abrasive dans le contact glissant, dont la composition pyrotechnique est sensible a la friction, et conçu pour etre tenu a la main ;
- effets principaux : effet sonore, avec éjection de serpentins et/ou de confettis.
Les schémas d'essais de type et d'essais de lot des party-poppers sont respectivement spécifiés aux Annexes A et B.
Ognjemet – 25. del: »Party-poppers« – Specifikacija in preskusne metode
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Fireworks - Part 25: Party Poppers - Specification and test methodsOgnjemet – 25. del: »Party-poppers« – Specifikacija in preskusne metodeArtifices de divertissement - Partie 25 : Party-Poppers - Spécifications et méthodes d'essaiFeuerwerkskörper - Teil 25: Party-Knaller - Anforderungen und PrüfverfahrenTa slovenski standard je istoveten z:EN 14035-25:2005SIST EN 14035-25:2006en71.100.30ICS:SLOVENSKI
STANDARDSIST EN 14035-25:200601-januar-2006
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14035-25November 2005ICS 71.100.30 English VersionFireworks - Part 25: Party Poppers - Specification and testmethodsArtifices de divertissement - Partie 25: Party-Poppers -Spécifications et méthodes d'essaiFeuerwerkskörper - Teil 25: Party-Knaller - Anforderungenund PrüfverfahrenThis European Standard was approved by CEN on 12 September 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14035-25:2005: E
EN 14035-25:2005 (E) 2 Contents Page Foreword.4 1 Scope.6 2 Normative references.7 3 Terms and definitions.7 4 Construction.7 4.1 Shape.7 4.2 Materials of firework case.7 4.3 Integrity.7 4.4 Length of pull-string.8 4.5 Ejected material.8 5 Performance.8 5.1 Pull-string.8 5.2 Principal effects.8 5.3 Number of reports.8 5.4 Sound pressure level.8 5.5 Burning matter.8 5.6 Projected material.8 5.7 Integrity of firework case after functioning.8 6 Primary pack.9 7 Minimum labelling requirements.9 7.1 General.9 7.2 Type name and category.9 7.3 Safety information.9 7.3.1 General.9 7.3.2 Party poppers.9 7.4 Name, address and telephone number of manufacturer or distributor or importer.9 7.5 Reference to this standard.10 7.6 Printing.10 7.6.1 Labelling.10 7.6.2 Type size.10 7.7 Marking of very small party poppers.10 7.7.1 Reduced size.10 7.7.2 Reduced information.10 7.8 Additional information on the primary pack.11 8 Test methods.11 8.1 Length of pull-string (type test and batch test).11 8.1.1 Apparatus.11 8.1.2 Procedure.11 8.2 Performance (type test and batch test).11 8.2.1 Test environment.11 8.2.2 Material.11 8.2.3 Apparatus.11 8.2.4 Procedure.13 8.3 Labelling (type test and batch test).14 Annex A (normative) Type testing.15 Annex B (normative) Batch testing.21 Annex C (Normative) Specification for test paper.24
EN 14035-25:2005 (E) 3 Annex D (normative) Method for determination of smouldering rate of cigarette.27 Annex E (informative) A-Deviations.28 Bibliography.30
EN 14035-25:2005 (E) 4 Foreword This European Standard (EN 14035-25:2005) has been prepared by Technical Committee CEN/TC 212 “Fireworks”, the secretariat of which is held by NEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2006, and conflicting national standards shall be withdrawn at the latest by May 2006. This European Standard is one of a series of standards as listed below. EN 14035-1, Fireworks - Part 1: Terminology. EN 14035-2, Fireworks - Part 2: Categorisation. EN 14035-3, Fireworks - Part 3: Aerial wheels - Specification and test methods. EN 14035-4, Fireworks - Part 4: Bangers and banger batteries - Specification and test methods. prEN 14035-5, Fireworks - Part 5: Batteries and combinations - Specification and test methods. EN 14035-6, Fireworks - Part 6: Bengal flames - Specification and test methods. EN 14035-7, Fireworks - Part 7: Bengal matches - Specification and test methods. EN 14035-8, Fireworks - Part 8: Bengal sticks - Specification and test methods. EN 14035-9, Fireworks - Part 9: Crackling granules - Specification and test methods. EN 14035-10, Fireworks - Part 10: Double bangers - Specification and test methods. EN 14035-12, Fireworks - Part 12: Flash bangers and flash banger batteries - Specification and test methods. EN 14035-13, Fireworks - Part 13: Flash pellets - Specification and test methods. EN 14035-15, Fireworks - Part 15: Fountains - Specification and test methods. EN 14035-17, Fireworks - Part 17: Ground spinners - Specification and test methods. EN 14035-18, Fireworks - Part 18: Hand-held fountains - Specification and test methods. EN 14035-19, Fireworks - Part 19: Hand-held sparklers - Specification and test methods. EN 14035-20, Fireworks - Part 20: Jumping crackers - Specification and test methods. EN 14035-21, Fireworks - Part 21: Jumping ground spinners - Specification and test methods. EN 14035-22, Fireworks - Part 22: Mines - Specification and test methods. EN 14035-23, Fireworks - Part 23: Non-hand-held sparklers - Specification and test methods. EN 14035-24, Fireworks - Part 24: Novelty matches - Specification and test methods. EN 14035-25, Fireworks - Part 25: Party poppers - Specification and test methods.
EN 14035-25:2005 (E) 5 EN 14035-27, Fireworks - Part 27: Rockets - Specification and test methods. EN 14035-28, Fireworks - Part 28: Roman candles - Specification and test methods. EN 14035-29, Fireworks - Part 29: Serpents - Specification and test methods. prEN 14035-31, Fireworks - Part 31: Shell–in-mortars - Specification and test methods. prEN 14035-33, Fireworks - Part 33: Spinners - Specification and test methods. EN 14035-34, Fireworks - Part 34: Table bombs - Specification and test methods. EN 14035-35, Fireworks - Part 35: Throwdowns - Specification and test methods. EN 14035-36, Fireworks - Part 36: Wheels - Specification and test methods. PrEN 14035-37, Fireworks - Part 37: Whistlers - Specification and test methods. prEN 14035-38, Fireworks - Part 38: Shot tubes - Specification and test methods. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EN 14035-25:2005 (E) 6 1 Scope This European Standard specifies requirements for the construction, performance, primary packaging and labelling of party poppers and the corresponding test methods. It is applicable to fireworks which are classified as party poppers in category 1 of EN 14035-2 and which are contained in a primary pack. It is applicable to party poppers which contain up to 10 mg of pyrotechnic composition that is based on potassium chlorate and red phosphorous. It is not applicable to party poppers containing pyrotechnic composition that includes any of the following substances: arsenic or arsenic compounds; mixtures containing a mass fraction of chlorates greater than 80 %; mixtures of chlorates with metals; mixtures of chlorates with potassium hexacyanoferrate(II); mixtures of chlorates with sulfur; mixtures of chlorates with sulfides; lead or lead compounds; mercury compounds; white phosphorus; picrates or picric acid; potassium chlorate with a mass fraction of bromates greater than 0,15 %; sulfur with an acidity, expressed in mass fraction of sulfuric acid, greater than 0,002 %; zirconium with a particle size of less than 40 µm. NOTE In EN 14035-2, party poppers are classified as follows: - brief description: device operated by a pull-string with an abrasive surface in sliding contact with a friction-sensitive pyrotechnic composition and designed to be held in the hand; - principal effects: report, with ejection of streamers and/or confetti. Schemes for type testing of party poppers and batch testing of party poppers are specified in annex A and annex B respectively.
EN 14035-25:2005 (E) 7 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 14035-1:2003, Fireworks — Part 1: Terminology. EN 14035-2, Fireworks — Part 2: Categorisation. EN 20187, Paper, board and pulps - Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples. (ISO 187:1990). EN 61672-1, Electroacoustics - Sound level meters - Part 1: Specifications (IEC 61672-1:2002). EN ISO 536, Paper and board - Determination of grammage. (ISO 536:1995). EN ISO 845, Cellular plastics and rubbers — Determination of apparent (bulk) density. (ISO 845:1988) EN ISO 868, Plastics and ebonite - Determination of indentation hardness by means of a durometer (Shore hardness) (ISO 868:2003). EN ISO 2439, Flexible cellular polymeric materials - Determination of hardness (indentation technique) (ISO 2439:1997, including Technical Corrigendum 1:1998). ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection. 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 14035-1:2003 apply. 4 Construction 4.1 Shape The shape of the party popper shall be such that it does not resemble a gun. Conformity to this requirement shall be verified by visual examination. 4.2 Materials of firework case The body of the firework case shall be made of paper, cardboard or plastics. Conformity to this requirement shall be verified by visual examination. 4.3 Integrity There shall be no splits, dents or bulges in the body of the firework case and no holes other than that through which the pull-string passes. There shall be no holes or splits in the closure of the mouth which shall be in place so that it retains the contents. Conformity to these requirements shall be verified by visual examination.
EN 14035-25:2005 (E) 8 4.4 Length of pull-string When measured in accordance with 8.1, the length of the pull-string shall be at least 75 mm. 4.5 Ejected material When examined in accordance with 8.2, the ejected material shall be made of paper. 5 Performance 5.1 Pull-string When tested in accordance with 8.2, the pull-string shall not break. 5.2 Principal effects When tested in accordance with 8.2, the principal effects of the party popper, as given in EN 14035-2, shall be a report with the ejection of streamers and/or confetti. 5.3 Number of reports When tested in accordance with 8.2, the party popper shall not produce more than one report. 5.4 Sound pressure level When tested in accordance with 8.2, a party popper shall produce a maximum A-weighted impulse sound pressure level (LAImax) of not higher than 120 dB (AI) at a horizontal distance of 500 mm behind the party popper. When tested in accordance with 8.2, a party popper shall produce a maximum A-weighted impulse sound pressure level (LAImax) of not higher than 120 dB (AI) lateral to the mouth of the party-popper at a horizontal distance of 500 mm perpendicular to the axis of the centreline of the party popper. 5.5 Burning matter When tested in accordance with 8.2, the functioning of a party popper shall not cause the test paper to catch fire or any holes to be burnt in the test paper. When tested in accordance with 8.2, the functioning of a party popper shall not cause the ejected material to catch fire. 5.6 Projected material When tested in accordance with 8.2, the projected material from a party popper shall not penetrate the test paper. 5.7 Integrity of firework case after functioning When tested in accordance with 8.2, the firework case shall have no additional holes or splits.
EN 14035-25:2005 (E) 9 6 Primary pack The primary pack shall completely enclose the party popper(s). There shall be no holes or splits in the pack, except those which are intended to enable the packaging to be opened and those which are otherwise technically necessary. Conformity to these requirements shall be verified by visual examination. 7 Minimum labelling requirements 7.1 General Party poppers and their primary packs shall be marked with the information specified in 7.2 to 7.5 and, if relevant, 7.7 and 7.8. The specified information shall be given in the language(s) of the country in which the party poppers contained in the primary packs are offered for retail sale. For each language, it shall be presented as a whole and shall not be interrupted by other text. Additional text given in another language shall not conflict with the specified information. Conformity to the requirements specified in 7.1 to 7.5, 7.6.1, 7.7.2 and 7.8 shall be verified by visual examination. NOTE Examples of typical labels for bangers, for which many of the marking requirements are similar to those specified for party poppers in this European Standard, are given in EN 14035-4. 7.2 Type name and category The type name shall be marked, in upper case, as 'PARTY POPPER'. If a trade name is used in addition to the type name, it shall not conflict with the principal effects of a party popper or with the name of another type of firework. The category shall be marked, in upper case, as 'CATEGORY 1' or 'CAT 1'. 7.3 Safety information 7.3.1 General Safety information shall be emphasized by use of a heading, or bold type, or similar. If necessary, instructions in addition to those specified in 7.3.2 may be given. 7.3.2 Party poppers Labelling shall include at least the following safety information in the order as follows: 'Keep away from eyes and ears'; 'Hold at arms length and point base away from body and not towards people’; 'Pull string firmly and sharply', or 7.4 Name, address and telephone number of manufacturer or distributor or importer Labelling shall include: name or trade mark, the address and the telephone number of the manufacturer; or
EN 14035-25:2005 (E) 10 abbreviation or a code allowing the identification of the manufacturer, and the name or trade mark, the address and the telephone number of his authorized distributor; or if the manufacturer is not established in a CEN member country, of the importer in a CEN member country. The address shall comprise at least the town and the country. On the party popper at least the abbreviations allowing the identification of manufacturer; or distributor or importer, with an additional code or abbreviation for the manufacturer shall be marked. 7.5 Reference to this standard A party popper shall be marked with 'EN 14035-25'. A primary pack shall be marked with the words 'Contents conform to EN 14035-25'. 7.6 Printing 7.6.1 Labelling Labelling shall be clearly visible, easily legible, indelible and on a single-colour background. NOTE Printing errors which are not misleading should not be classified as faults. 7.6.2 Type size When measured in accordance with 8.3, the type sizes shall be such that the height of the character ‘X’ (in upper case) is at least 2,8 mm for the information specified in 7.2, 7.3 and 7.8 and at least 2,1 mm for the other information. 7.7 Marking of very small party poppers 7.7.1 Reduced size If the party popper does not provide enough space for the specified information using the types sizes specified in 7.6.2, for the information specified in 7.2 and 7.3 the type size shall be reduced to 2,1 mm. 7.7.2 Reduced information If the party popper does not provide enough space to carry all the specified information even in reduced type size, at least the information specified in 7.4 shall be given on the party popper, if at all possible.
EN 14035-25:2005 (E) 11 7.8 Additional information on the primary pack The primary pack shall be marked with the statement: 'Must be sold as packaged'. This statement shall appear adjacent to the type name or category. For the printing 7.6 applies. 8 Test methods NOTE Conformity with the requirements 4.1, 4.2, 4.3, 6, 7.1 to 7.5, 7.6.1, 7.7.2 and 7.8 shall be verified by visual examination. 8.1 Length of pull-string (type test and batch test) 8.1.1 Apparatus Ruler, reading to 1 mm. 8.1.2 Procedure Carefully extend the pull-string to its full length without firing the party popper. Measure the total exposed length of the pull-string with the ruler (8.1.1) to the nearest 1 mm. Record the length. 8.2 Performance (type test and batch test) 8.2.1 Test environment Test area. The test area shall be indoors and shall be clean. For type testing, a flat, horizontal, sound-reflecting surface shall be provided. 8.2.2 Material Sheet of test paper, (750 x 750) mm, conforming to Annex C. 8.2.3 Apparatus 8.2.3.1 Means of clamping the party popper in a horizontal position. 8.2.3.2 Paper holder, for holding the sheet of test paper in a vertical plane, as shown in Figure 1. 8.2.3.3 Weighted rod, 750 mm long, diameter 8 mm, mass (300 ± 20) g. 8.2.3.4 Two sound level meters (for type testing only), conforming to class 1 of EN 61672-1 with free-field microphones. 8.2.3.5 Measuring device, capable of measuring a length of 500 mm to the nearest 1 mm. 8.2.3.6 Measuring device, capable of measuring a height of 200 mm to the nearest 1 mm.
EN 14035-25:2005 (E) 12 Dimensions in millimetres
Figure 1 - Paper holder Dimensions in millimetres
Key 1 Paper clamp 2 Sheet of paper 3 Weighted rod 4 Party popper Figure 2 - Arrangement for performance test
EN 14035-25:2005 (E) 13 8.2.4 Procedure 8.2.4.1 Set up the paper holder (8.2.3.2) in the test area (8.2.1) with a sheet of test paper (8.2.2) in place and held taut in a vertical plane by means of the weighted rod (8.2.3.3), as shown in Figure 2. Position the party popper by use of the clamping device (8.2.3.1), so that its axis is horizontal and perpendicular to the test paper, with the end closure facing the test paper at a distance of 500 mm from the centre of the sheet (see Figure 2), determined by the measuring device (8.2.3.5). 8.2.4.2 If carrying out a type test, set up the microphone of one sound level meter (8.2.3.4) in the test area (8.2.1), at a height of (200 ± 10) mm above a flat, horizontal, reflecting surface, determined by the measuring device (8.2.3.6), and at a horizontal distance of 500 mm behind the party popper, determined by the measuring device (8.2.3.5). Set up the microphone of the second sound level meter (8.2.3.4) in the test area (8.2.1), at a height of (200 ± 10) mm above a flat, horizontal, reflecting surface, determined by the measuring device (8.2.3.6), and placed laterally at 90° to the mouth of the party popper and at a horizontal distance of 500 mm from the centreline of the party popper (see Figure 3). Direct the microphones horizontally towards the party popper and, if necessary, connect them to the sound level meters.
Dimensions in millimetres
Figure 3 — Sound level measurement
EN 14035-25:2005 (E) 14 8.2.4.3 Unfold the string, if necessary, and extend the pull-string to its full length. Pull the string sharply. If the pull string breaks, record the fact and do not proceed with further testing of that party popper. Observe and record whether the party popper produces a single report. 8.2.4.4 Observe and record whether the party popper ejects streamers and/or confetti. Observe and record whether any ejected material caught fire; whether the test paper caught fire or had any holes burnt in it; and whether any projected material penetrated the test paper. 8.2.4.5 If carrying out a type test, record the maximum A-weighted impulse sound pressures, as measured by the sound level meters (8.2.3.4). 8.2.4.6 After the party popper has ceased to function examine the firework case and record whether there are any additional holes or splits in the firework case. Examine the ejected material visually and record whether it is made of paper. 8.3 Labelling (type test and batch test) Check conformity to 7.6.2 and 7.7.1, for example by comparing the type sizes on the actual label with a transparent copy made from Figure 4 (for the empty frame, use the inside). Record whether the type sizes are correct. 2,8 mm:
ABC abc XYZ xyz 123
2,1 mm:
ABC abc XYZ xyz 123
Figure 4 — Type sizes of print
EN 14035-25:2005 (E) 15 Annex A (normative) Type testing A.1 General For the purposes of type testing each of the party poppers tested shall conform to clauses 4, 5 and 7. The party poppers subjected to mechanical conditioning in accordance with clause A.5 shall, additionally, conform to clause A.3. Each of the primary packs examined shall conform to clauses 6 and 7. A.2 Number of party poppers to be tested A total of 30 party poppers shall be tested, in accordance with table A.1, selected at random from at least 5 primary packs. Table A.1 − Number of party poppers to be tested Number of party poppers to be tested Condition Tests 10 'As received' - Visual examination - 8.1 - 8.2 - 8.3 10 After thermal conditioning in accordance with clause A.4 - Visual examination - 8.2 10 After mechanical conditioning in accordance with clause A.5 - Visual examination - 8.2 A.3 Loose pyrotechnic composition The mass of any loose pyrotechnic composition collected after mechanical conditioning in accordance with A.5 shall not exceed 1 mg. After mechanical conditioning in accordance with A.5 the closure of the mouth of the party poppers shall be in place.
EN 14035-25:2005 (E) 16 A.4 Thermal conditioning Store the party poppers in complete unopened primary packs for four weeks at a temperature of (50,0 ± 2,5) °C and then for at least two days at room temperature before testing. A.5 Mechanical conditioning A.5.1 Apparatus A.5.1.1 Mechanical shock apparatus, as illustrated in Figures A.1 to A.3, comprising the following components. a) flat horizontal platform made of steel, 800 mm × 600 mm, 2 mm to 3 mm thick, with a 3 mm thick rim having a height of 15 mm; the platform is reinforced with eight steel ribs, 5 mm thick with a height of 30 mm, which are welded to the underside and run from the centre to each of the four corners and to the middle of each edge; b) 20 mm thick plate of fibreboard, firmly attached to the platform by screws; c) cylindrical steel boss, diameter 125 mm and height 35 mm, located under the centre of the platform; d) 284 mm long shaft, with diameter of 20 mm, fixed to the centre of the boss; e) restraining peg, to prevent the platform from rotating; the mass of the platform assembly (items a) to e)) shall be (23 ± 1) kg; f) annular, elastomeric pressure spring, with a Shore A hardness, when determined in accordance with
EN ISO 868, of 68, outside diameter 125 mm, inside diameter 27 mm and height 32 mm, on which the cylindrical boss will rest; g) shallow steel cylinder, inside diameter 126 mm, wall thickness 5 mm, outside height 30 mm, with a base 8 mm thick which has a 25 mm diameter hole drilled through the centre, to contain the elastomeric spring; h) supporting steel cylinder, outside diameter 80 mm, inside diameter 60,1 mm and height 92,4 mm, to which th
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