BS 1982-1-1990 Fungal resistance of panel products made of or containing materials of organic origin - Method for determination of resistance to wood-rotting Basidiomycetes《有机材料制成或.pdf

1、BSI BSXL982: PART*L 01 m 3624669 0359597 545 m BRITISH STANDARD Fungal resistance of panel products made of or containing materials of organic origin Part 1. Method for determination of resistance to wood-rotting Basidiomycetes IMPORTANT NOTE. It is essential that this Part of BS 1982 is read in coq

2、junction with part O which is published separately. Rsistance aux champignons des panneaux base de matires dorigine organique Fartie 1. Mthode de dtermination de ia rsistance aux Basidiomyctes pourrisant le bois Bestndigkeit gegen Basidiomyzeten schimmelbestndigkeit von Platten aus organischen Stoff

3、en zw. mit organischen Bestandteilen lii 1. Verfahren zu Bestimmung der BS 1982 : Part 1: 1990 ES1 BS*1982: PARTUL 01 1624669 0359598 481 =I Amd. No. First published as ES 1982, June 1953 Second edition September 1968 Third edition as BS 1982 : Part 1, October 1990 The foilowing BSI references relat

4、e to the work on this standard: Committee reference wPc/10 Draft for comment 87152051 DC ISBN O 680 18439 O 7 780 BS 1982 : Part 1 : 1990 Date 10 -6 -73 kJ- - Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Wood Preservation Standards Po

5、licy Committee (WPC/-) to Technical Committee WPC/lO, upon which the following bodies were represented: Association of Consulting Scientists British Pest Control Association British Wood Preserving and Damp-proofing Association Chemical industries Association Department of the Environment (Building

6、Research Establishment) Timber Research and Development Association This British Standard, having been prepared under the direction of the Wood Preservation Standards Poiicy Committee, was published under the authority of the Board of BSI and comes into effect on 31 October 1990 o WI 1990 Amendments

7、 issued since publication BSI BStL982: PARTtL 01 m Lb24669 0359599 318 m BS 1982 : Part 1 : 1990 Contents Committees responsible Foreword page Inside front cover 2 Method 1 Scope 2 Principle 3 Materials and reagents 4 Apparatus and facilities 5 sampling 6 Testspecimens 7 Preparation of test material

8、s 8 9 Exposure to fungi 10 11 Validity of the test 12 Assessment of results 13 7kstreport Preparation of culture vessels and inoculation with test fungi Examination after exposure to fungal attack 3 3 3 5 6 5 6 7 7 9 9 9 10 Appendices B Methods of sterilization 12 C Testing the decay resistance of p

9、anel products 13 D Calculations 15 E Calculation of decay susceptibiity index (DSI) 15 F 16 Tble A Determination of water holding capacity (WHC) of soil 11 Example of a test report including table of results 1 Test fungi 4 Filme 1 Test assemblies 8 1 ES1 BSWL982: PARTWL 01 Lb2Vbb9 0359600 9bT BS 198

10、2 : Fart 1 : 1990 Foreword This Part of this Bs 1982 has been prepared under the direction of the Wood Preservation Standards Policy Committee. BS 1982 was published in 1968 as a single standard including three test methods. This revision provides a fuller consideration of the possible h tolerant of

11、 a wide range of preserving chemicals. A cause of decay of particleboard in service. A muse of decay of roof decking and insulants. Causes extremely active attack of pine heartwood indicating a tolerance of naturally occurring phenolics. Extremely sensitive to gaseous sterilants, which shall not be

12、used. Not indigenous but may be present in imported softwoods and has caused decay in flat roofs. Xerophytic and temperature tolerant, causes active decay of both hardwoods and softwoods. The cause of dry rot. Causes active decay in buiidings in damp and confined conditions. A common cause of decay

13、of nondurable hardwoods. I) Vermiculite is suitable. 4 BSI BS*:1982: PART*L 01 = bb24bb9 0359b03 b9 Bs 1982 : Part 1 : 1990 3.2.3 Edge-sealant (see 7.2.3) comprising the fungicide dichlofluanid at a concentration of 0.3 % (m/m) in beeswax. NOIE The fungicide is taken into solution in the minimum vol

14、ume of white spirit and then dispersed in the molten beeswax. During preparation and use of the sealant the minimum temperature required to achieve iiquidity (approximately 65 OC) should be used. CAUTION. It is essential that the precautions normaiiy employed with toxic chemicals are used during pre

15、paration and use and subsequently during handling of edge-sealed materials. 4 Apparatus and facilities Ordinary laboratory apparatus and in particular the following are required. 4.1 Mlities for vacuum filtration, comprising vacuum source, filter flask, Buchner funnel and coarse grade fitting filter

16、 papers) of 125 mm diameter. 4.2 Ventilated drying m, capable of being controlled at 50 f 1 OC and at 103 f 2 OC (or separate ovens for each temperature). 4.3 Sealaale conhim, e.g. desiccators without desiccant. 4.4 Mlities far stenlhtion of test samples, e.g. ionizing radiation source, sterilizer o

17、r steamer. (See appendix B for details.) 4.5 Autmtve, for sterilization of culture vessels adjustable to 121 OC. 4.6 Culture ?x.ssek. These shall be made from inert materials capable of being sterilized and shal be provided with ventilated lids. They should be at least 65 mm high and provide a minim

18、um soil suxface of 25 cm2, this being the minimum space allocation required for each test block. A glass vessel capable of holding two test blocks is described in ES 6009; another suitable jar is illustrated in figure 1 of this Part. h provide ventilation the centre of the lid shall be pierced with

19、a round hole 12 mm in diameter and plugged with a wad of non-absorbent cotton wool. If other types of culture vessel are used, mustments to the procedure in 8.1 may be necessary and shall be recorded in the test report. 4.7 Culture chu both of which may or may not be edge-sealed. The choice of block

20、s to be included in a test scheme depends on the nature of the product and its history and on whether this information is available. The first part of appendix C sets out a series of questions and answers leading to the mid part of appendix C showing the pretreatments and numbers of test blocks requ

21、ired. 6.2 Test blocks Reject from each of the three sheets of the product under test a strip 300 mm wide from each of the edges. Cut equal numbers of test blocks (see appendix C), 50 mm by 25 mm, from the remainder of each sheet using the whole thickness of the product. Cut a sufficient number of bl

22、ocks to provide two blocks from each sheet for exposure to each test fungus. Reject any blocks that show defects such as gaps, knot voids, veneer rupture, or discontinuous adhesion. Number the blocks to retain block and sheet identity. Some types of dense panel product, e.g. wood cement particleboar

23、d or, for example those containing water repellent additives, may faii to attain the required moisture content (see 10.2). If this is a possibility cut two further blocks from each sheet and use them as wetting check blocks (see 10.2) if required. 6.3 Artifidly aged test blocks Artificaly aged test

24、blocks are needed to supplement the test results, except when it is known that the test product does not contain ingredients which give temporary protection against funga attack under the test conditions. They shal be cut from the sheets of the test product in the same way and with the same dimensio

25、ns and quantity as the blocks in 6.2. If the determination of loss in mass due to the ageing pmess alone is required, an additional two check blocks shal be cut from each sheet (see 7.2.2). I) Whatman No. 4 filter paper has been found to be suitable. BSI BStLS2: PART* (b) exposure to vapours of prop

26、ylene oxide or ethylene oxide; (e) steam sterilization. Further information on these procedures and limitation as to their use is given in appendix B. 8 Preparation of culture vessels and inoculation with test fungi 8.1 Preparation of culture vessels Determine the WHC and the moisture content of the

27、 soil (3.2.1). Charge each culture vessel (4.6) with the appropriate amount of soil (3.2.1), so as to give a depth of soil of not less than 35 mm. Plant a feeder block (3.1.2.3) centrally with a broad face slightly pressed down into the soil surface. Add istiled or deionized water to bring the soil

28、moisture content to 120 % of its WHC. Close the vessel and sterilize the assembly in the autoclave (4.6) at 121 OC for 1 h. Allow it to cool to room temperature. NOTE. The addition of water to bring the soil to a moisture content above its WHC makes dowances for water needed to moisten the feeder bl

29、ock and for loses incurred during steriiization. 8.2 Inoculation Aseptically transfer wo 6 mm diamet r inocula from one f the test fungi (3.1.1) on to the soil surface so that they make contact with the feeder block near diagonally opposed corners. 8.3 Incubation incubate the inoculated culture vess

30、els in the culture chamber (4.7) at 22 f 1 O C and at 70 f 5 % r.h. for 3 weeks to 4 weeks. 9 Exposuretofungi 9.1 Planting Plant the sterilized test blocks, control blocks or reference matenal blocks aseptidy, in pairs of the same type, in each vessel previously inoculated with the appropriate test

31、fungus. Place one block over each end of the feeder block with its long axis at right angles to the long axis of the feeder block. The two blocks shd be separated from each other by about 5 mm (see figure l(a). 9.2 Additive for white rot fungi Using aseptic procedures, surround the blocks in the cul

32、ture vessels inoculated with white rot fungi with sterilized white rot additive (7.2.4) and cover with it to a depth of about 20mm above the upper face of the blocks (see figure i). 9.3 Incubation incubate the completed assemblies at 22 f 1 O C and at 70 f 5 % r.h. for 12 weeks. 7 BSI BS*L982: PART*

33、l 01 W Lb24bb9 0359bOb 388 W BS 1982 : Fart 1 : 1990 II (a) For brown rot Feeder blocks (b) For white rot whiterot : :;-.?.; additive :*. :. . . .*.f. NUIE. Dimensions of a 600 ml container are given in miiiimetres for information only (see 4.6). Figure 1. hst assemblies 8 ESI.BS*/982: PART* o) the

34、title of this method; . (9) the name of the applicant; (d) the name of the panel product under test and a description including as much of the following information as is available together with the basis, or source of the information: (1) type, e.g. plywood, particleboard, etc; (2) identifying mark

35、s, e.g batch number; (3) country of origin and producer; (4) main constituents including for plywood, the species of timber in each veneer; (5) the nature of any bonding agents used; (6) prouct thickness and density; (7) presence of added biocides and whether incorporated during or after manufacture

36、 (e) Reference to ageing or other preconditioning procedures applied prior to exposure of any of the test pieces to fungai attack, quoting where appropriate the standard describw the method; (f) the mode of sterilization of the test pieces; (g) the names and strain numbers of the test fungi employe

37、d and the species of virulence control timber used with each fungus; (h) any optional reference materials used; (i) the duration and temperature of exposure to fungal attack; (i) the mean percentage mass loss of virulence control blocks and reference material blocks cad by each fungus; (k) the mean

38、mass loss of test blocks and artificaly aged test blocks and, the mean corrected mas loss of edgesealed test blocks exposed to each fungus indicating any signifhnt differences between sheets; (1) a description of the extent of overgrowth of each type of test block by each fungus and any stratificati

39、on of attack by fungus evident on completion of incubation or after drying; (m) an assessment of the resuits obtained using the guidelines laid down in clause 12; (n) the organization responsible for the report and the date of issue; (o) the name and signature of the officer) in ) the following note

40、 The interpretation and practicai conclusions that can be drawn from a test report demand a specialized knowledge of the subject of wood preservation and, for this reason, the test report cannot of itself constitute an approval certificate. The test report shall also list any variation from the des

41、cribed test method, as well as any factors that may have influenced the results. 10 ES1 BSaL2: PART*L OL Lb24bb9 0359609 097 BS 1982 : Part 1 : 1990 Appendices Appendix A. Determination of water holding capacity (WHC) of soil A.l Principle The ability of a soil sample to retain water against the pul

42、i of a vacuum pump has been accepted as a measure of its (WHC). A.2 Procedure NOTE. The method described is that used for a moist soil sample. if the sample is dry, it should be wetted, mixed to give a crumb structure and allowed to stand overnight in a covered container prior to the detemation of i

43、ts WHC. If a white rot additive sample is tested minor modifications such as ipducing the dry sample mass to 40 g and overnight soaking in excess of water m a beaker prior to testing should be used. Place a 200 g test portion of the soil (mi) to be used in the Buchner funnel over a coarse grade filt

44、er paper (4.1). lhp down gently and flood genty with water. Apply suction for 10 min, increasing the degme of suction sowly to avoid perforation of the fiiter paper. Transfer the soil plus filter paper to a container of known mass (m,) and weigh (m6). Dry the container and contents in an oven at 103

45、 f 2 OC and weigh again (m.,). Repeat with two further repicate samples. Determine the mak of a wet filter paper, after subjecting it to suction in the Buchner funnel (mJ. Determine the mass of the same filter paper after oven drying at 103 f 2 OC (%). A.3 Calculations A.3.1 Initial moisture content

46、 afsoil The initial moisture content, W1, (in % (m/m) is given by the foliowing formula: 100 m4 - (m, + m3) where m, is the mass of soil taken (in g); m, is the mass of the container (in g); m, is the mass of the oven dry filter paper (in g); m4 is the mass of the container plus oven dry soil plus f

47、ilter paper (in 8). A.3.2 Moisture content of soil at WHC The moisture content of the soil at its WHC, W2 (in % (dm) is given by the formula: % + m6 - (m4 + m6) 100 m4 - (m, + md where m, is the mass of the container plus wet soil plus filter paper (in g); m, is the mass of wet filter paper (in g).

48、A.3.3 Amount of water required to raise moisture content Qfsoil substrate to a given percentage of the WHC The amount of water is given as a percentage of the mass of soil taken by the formula: A where W, is the percentage of WHC required. A.3.4 Example of calculations The following are examples of

49、the calculations used in A.3. m, mass of soil taken = 200 g %, mass of container = 174 g w, mass of the oven dry filter paper = 1 g m4, mass of container plus oven dry soil plus filter paper = 367 g m, mass of container plus wet soil plus filter paper = 433 g m6, mass of wet filter paper = 3 g W, percentage of the WHC required = 120 % W, initial moisture content of soil = W, moisture content of soil at WHC = + 433 - (367 + 3, x 100 = 33.3% (m/m) 367 - (174 + 1) Additional water to raise so2 to 120 % WHC = (z x 33.33 - 4.2 100 + 4.2 x 1