SANS 1305-2009 Sealing compounds for the building industry one-component silicone-rubber-base《硅橡胶基单组份建筑行业用密封化合物》.pdf

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1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-23118-7 SANS 1305:2009Edition 1.2Any reference to SABS 1305 is deemedto be a reference to this standard(Government Notice No. 1373 of 8 No

4、vember 2002)SOUTH AFRICAN NATIONAL STANDARD Sealing compounds for the building industry, one-component, silicone-rubber-base Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 1305:2009 Ed

5、ition 1.2 Table of changes Change No. Date Scope Amdt 1 1990 Amended to change the requirement for resistance to compression-extension cycling and to convert the requirement for tack-free time to a requirement for skin-forming time. Amdt 2 2008 Amended to change the designation of SABS standards to

6、SANS standards, and to update the definition of “acceptable”. Foreword This South African standard was approved by National Committee SABS TC 1012, Sealant, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published

7、in August 2009. This document supersedes SABS 1305:1980 (edition 1). A vertical line in the margin shows where the text has been technically modified by amendment Nos 1 and 2. SANS 1305:2009 Edition 1.2 1 Contents Page Foreword 1 Scope . 3 2 Definitions 3 3 Requirements . 4 4 Packing and marking . 5

8、 5 Sampling and compliance with the specification . 6 6 Methods of test 6 6.1 Preparation of test samples and test substrates . 6 6.2 Condition of the sealing compound in the container . 7 6.3 Storage stability . 7 6.4 Colour 7 6.5 Working properties and extrusibility . 76.6 Loss of mass, cracking,

9、and chalking on heat aging 8 6.7 Skin-forming time 8 Amdt 1 6.8 Rheological properties 8 6.9 Hardness 8 6.10 Adhesion in peel . 9 6.11 Compression-extension cycling test . 9 Appendix A Applicable standards 11 Appendix B Notes to purchasers . 11 Appendix C Notes to users . 12 SANS 1305:2009 Edition 1

10、.2 2 This page is intentionally left blank SANS 1305:2009 Edition 1.2 3 Sealing compounds for the building industry, one-component, silicone-rubber-base 1 Scope 1.1 This specification covers the requirements for two types (see 3.1) of one-component solvent-free silicone-rubber-base sealing compounds

11、 for the building industry, and that are suitable for both interior and exterior use. 1.2 Neither type is designed for use in areas subjected to traffic, and the acid-cured types are not suitable for alkaline surfaces. NOTE a) The standards referred to in the specification are listed in appendix A.

12、b) A requirement that must be specified by the purchaser and a requirement that must be agreed upon between the supplier and the purchaser are given in appendix B. c) Notes to users of the compounds are given in appendix C. 2 Definitions 2.1 For the purposes of this document the following definition

13、s shall apply: acceptable acceptable to the authority administering this standard, or to the parties concluding the purchase contract, as relevant Amdt 2 batch final blend or mix of sealing compound in one large vessel from which smaller containers are filled for distribution or marketing cartridge

14、small container designed for insertion in a caulking gun lot that quantity of sealing compound of the same colour in containers of the same type and size and bearing the same batch identification, produced by one manufacturer, and submitted at any one time for inspection and testing SANS 1305:2009 E

15、dition 1.2 4 maximum total joint movement sum of the expansion and the contraction of the nominal joint width at the time of sealing standard test conditions temperature of 25 C 2 C and a relative humidity of 50 % 4 % 3 Requirements 3.1 Types The sealing compound shall be of one of the following typ

16、es, as specified by the purchaser: a) Type 1: Sealing compound for building joints. b) Type 2: Sealing compound for glazing and sanitary ware. NOTE Type 1 sealing compounds are of the low modulus type and type 2 of the high modulus type (see also appendix C. 3.2 Composition The sealing compound shal

17、l be of a one-component type that contains, as the only binder, organo-polysiloxane polymers, and that, on exposure to the atmosphere, cures to a rubber-like solid with a tack-free surface. 3.3 Application temperature The sealing compound shall be suitable for use throughout the temperature range of

18、 4 C to 35 C. 3.4 Condition of the sealing compound in the container The sealing compound in a container shall be a uniform and homogeneous mixture that shows no sign of separation or instability and is free from lumps, rubbery and coarse particles, and foreign material. It shall, after curing, not

19、have an objectionable or irritating odour. 3.5 Storage stability After storage in the original unopened container at 35 C for six months after the date of purchase, the sealing compound shall still comply with all the other requirements of the specification. 3.6 Colour The colour of the sealing comp

20、ound after curing shall, when examined in accordance with 6.4, match the reference colour agreed upon between the purchaser and the manufacturer. 3.7 Working properties and extrusibility The sealing compound shall be capable of being extruded freely by a hand-operated gun and, when tested in accorda

21、nce with 6.5, it shall extrude freely and be capable of being applied to any normal joint by an air-pressure-operated gun, and at least 50 g of the compound shall be extruded in 60 s under standard test conditions. SANS 1305:2009 Edition 1.2 5 3.8 Loss of mass, cracking, and chalking on heat aging A

22、fter being heated, in accordance with 6.6, at 70 C 2 C for 14 d, the sealing compound shall not a) lose more than 10 % of its original mass, and b) show any cracks or chalking. 3.9 Skin-forming time When tested in accordance with 6.7, the sealing compound shall be workable after 5 min and shall not

23、have formed a skin, but shall have formed a skin within 6 h. Amdt 1 3.10 Rheological properties When tested in accordance with 6.8, the sealing compound shall not show any vertical slump or sag in excess of 2 mm, and it shall show no deformation when tested for horizontal slump. 3.11 Hardness When t

24、he sealing compound is tested in accordance with 6.9, both the initial hardness and the hardness after heat aging shall be between 10 and 50 International Rubber Hardness (I.R.H.) units, and the hardness after heat aging shall not exceed the initial hardness by more than 10 I.R.H. units. 3.12 Adhesi

25、on in peel When tested in accordance with 6.10 on glass, aluminium, standard mortar (when relevant), and any other substrate recommended by the manufacturer, the sealing compound shall have a peel strength of at least 25 N and shall not, in any individual test, show more than 10 % loss of adhesion.

26、3.13 Resistance to compression-extension cycling When the sealing compound is tested in accordance with 6.11 with glass, standard mortar (when relevant), aluminium, and any other substrate recommended by the manufacturer, the total area of loss of bond and loss of cohesion on an individual specimen

27、shall not exceed 200 mm2. Amdt 1 4 Packing and marking 4.1 Packing The sealing compound shall be supplied in containers that are strong enough to withstand normal usage and that are so sealed as to prevent leakage and contamination of the contents during normal transportation and storage. Only cartr

28、idges or other containers filled with sealing compound of the same colour and from the same batch shall be packed together in a bulk container. 4.2 Marking Each container shall be legibly and durably marked with the following information: a) the manufacturers name and the brand name of the product;

29、b) the words “Silicone-rubber-base sealing compound“; SANS 1305:2009 Edition 1.2 6 c) the type; d) the colour; e) the application instructions (that include the primers recommended for use on specific surfaces); f) the batch identification; g) the storage temperature range; h) the date of manufactur

30、e. 5 Sampling and compliance with the specification NOTE This section applies to the sampling for inspection and testing before acceptance or rejection of single lots (consignments) in cases where no information about the implementation of quality control or testing during manufacture is available t

31、o help in assessing the quality of the lot. It is also used as the procedure for adjudicating in cases of dispute. 5.1 Sampling The following sampling procedure shall be applied in determining whether a lot complies with the requirements of the specification. The samples so drawn shall be deemed to

32、represent the lot for the respective properties. 5.1.1 Sample for the storage stability test After inspecting the lot for compliance with section 4, draw from it at random enough containers to provide at least 4 L of sealing compound. 5.1.2 Sample for the remaining tests From the lot draw at random

33、enough containers to provide at least 4 L of sealing compound. 5.2 Compliance with the specification The lot shall be deemed to comply with the requirements of the specification if, on inspection and testing, the samples taken in accordance with 5.1 are found to comply with all the relevant requirem

34、ents of the specification. 6 Methods of test 6.1 Preparation of test samples and test substrates 6.1.1 Conditioning of test samples Unless otherwise stated in the method, condition the test samples taken in accordance with 5.1.2 under standard test conditions (see 2.1) for at least 16 h before drawi

35、ng samples for the tests given in 6.4 to 6.11. 6.1.2 Test substrates When so specified by the manufacturer (see 4.2(e), prime substrate material with the recommended primer and in the manner specified. NOTE Include in the test report the use of such primers, and the manufacturers designation of the

36、primers. SANS 1305:2009 Edition 1.2 7 6.2 Condition of the sealing compound in the container 6.2.1 Cartridges Extrude enough sealing compound from the cartridge(s) taken in accordance with 5.1.2 to examine the condition for compliance with the requirements of 3.4. 6.2.2 Containers other than cartrid

37、ges Examine the sealing compound in the container(s) taken in accordance with 5.1.2 for compliance with the requirements of 3.4. 6.3 Storage stability Store the container(s) taken in accordance with 5.1.1 for six months from date of purchase at 35 C and at the end of the period examine and test the

38、sealing compound for compliance with the requirements of 3.5. 6.4 Colour Take sufficient sealing compound and spread it evenly to form a film of thickness at least 1 mm over an area of at least 70 mm 75 mm on a suitable steel panel. Allow the sealing compound to cure under standard test conditions f

39、or 7 d. At the end of this period, compare the colour of the sealing compound with the reference colour by viewing it and the reference colour (see 3.6) placed adjacent to it, under identical conditions of diffused southern daylight or its equivalent. Ensure that the light falls vertically on the pa

40、nel and reference colour and that the viewing is done at 45 from the normal, or vice versa. 6.5 Working properties and extrusibility 6.5.1 Equipment a) Caulking gun. An air-powered caulking gun that has a tapered nozzle with an orifice of nominal internal diameter 6 mm or that can take a cartridge w

41、ith a plastics nozzle. b) Compressed air supply. Clean dry air at a constant 345 kPa 15 kPa. c) A balance, sensitive to 0,5 g or better. d) Filter paper. e) A stop-watch with a second hand. 6.5.2 Test Specimen Unless the containers in which the sealing compound is supplied are cartridges, fill a sui

42、table cartridge with the compound. 6.5.3 Procedure a) Condition the caulking gun and cartridge of sealing compound under standard test conditions for at least 16 h. If a cartridge with a plastics nozzle is used, so cut the nozzle that the internal diameter of its orifice is 6 mm. Place the cartridge

43、 in the gun and connect the gun to the compressed air supply. SANS 1305:2009 Edition 1.2 8 b) Apply the sealing compound to suitable horizontal and vertical joints and note whether it flows freely and works satisfactorily. c) Place a filter paper on the pan of the balance, extrude sealing compound o

44、n to the filter paper for exactly 60 s under standard test conditions, and record the mass of sealing compound extruded. 6.6 Loss of mass, cracking, and chalking on heat aging Use the relevant method described in SANS 110 (ignoring the reference to the preparation of a two-component sealing compound

45、) but a) heat age for 14 d instead of 7 d, and b) at the end of the test examine the sealing compound in each specimen for the formation of cracking and chalking only. 6.7 Skin-forming time 6.7.1 Equipment An expendable aluminium dish of nominal diameter 45 mm and of nominal depth 6 mm. 6.7.2 Test s

46、pecimen Condition the sealant in its closed container at a temperature of 25 C 2 C and a relative humidity of 50 % 4 % for 24 h. 6.7.3 Procedure Full the dish with sealant and expose it to a temperature of 25 C 2 C and a relative humidity of 50 % 4 %. After 5 min and again after 6 h, gently draw the

47、 surface of the sealant with a sharp probe or needle. 6.7.4 Report Report whether a skin has been formed after 5 min and after 6 h. Amdt 1 6.8 Rheological properties Use the equipment and procedure described in the relevant method given for type 2 compound in SANS 110, but a) when degreasing the cha

48、nnels, disregard the phrase “until water-break free“; and b) test the sealing compound, as conditioned (see 6.1.1), for 4 h instead of 24 h. 6.9 Hardness Use the relevant method given in SANS 110, but a) test the sealing compound as conditioned (see 6.1.1) and allow to cure for 21 d (instead of 14 d

49、) before determining the initial hardness, and SANS 1305:2009 Edition 1.2 9 b) in the determination of the hardness after heat aging, after curing the specimens under standard test conditions for 7 d, heat age them in the oven for 14 d (instead of 21 d). 6.10 Adhesion in peel Use the relevant method given in SANS 110 but a) test the sealing compound as conditioned (see 6.1.1), b) omit the test with mortar blocks in the case of type 2, and c) in the preparation of the test specimens, instead of the 2 d and 5 d curing periods, use periods of 7 d and 14 d