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11/15/1995 07: 32 6045304466 DEC__K_._ING PAGE 09 7.3 5 Lap Jotsu Strtno — Prespam lxp-jolwtfd camp;ea ging t#ta mitnufaciu�tir'a recommended lap width (up to a maximum of 50 raids) and welding instructions. For Types 1 and 2 membranes, follow the stone ptoccdure as in par.7.3.3. For Types 3 and 4 membranes follow the same procedure as in pat.7.3.4.Cut live specimens of the size and geometry required to perform the appropriate tetlsileANVAIdttg stMUS&tests, with the lap seats At the Centre of each specimen. Compare the average of the five measurements with the tensileftealdng strength of the membrana as determined in par.7.3.3 and 7.3.4. If a side lap his been prepared, compm the lap joint strtetigth with the cr*" machine direction tensile or bmaldng strength. If an end lap has been prepared,compare the lap joint strength with the machine dirrction tensile or breaking strength. In addition, plate a lap-jointed specimen in boiling water for 7 d and determine the strength of the scam as described above. Report the lap width that was tested. 7.3.6 Low Tenape^otwV Impart — Perform in accordance with ASTM D 1790, at a tempmature of -30:t 1°C for Classes A, B and C membranes, and at -15:t 1°C for Class D membranes, except that specimens shall be maintained at the test temperature for 90t 5 thin. The impact test shall be performed in the cold chamber. 7.3.7 X*d knee to Haat Aging—Cut a sample of sufficient sin to perform the tests described in par. 7.3.3. 7.3A and 7.3,8. Expose the sample for 60 d at 80 t 1°C in An air-circulating oven. After an 1$h recovery period at standard conditions,measure the tensilw reeking strength,elongation and low tempetatum flexibility.Inspect the membranes that leave been heat-aged for delamination. 7.3.8 Low Tse Ftsxfbllfty(Note 3)—Perform in accordance with ASTM D 2136 at-AO t 1°C for Classes A.B and C,and at-15 t 1°C for Class D. Cut sire specimens,threw for the ituitW test and three for a possible retest For membranes with a fabric backing, the backing shall be removed prior to pedwaiing the test.Use eitbet the beading fixture desaibed in ASTM D 2136,or perform the teat H=ually using a mandrel equipped with a 3.2 mm diameter steel rod. Position the specimens between glass plateau and then place the specimens, and bending fixture or mandrel,in the low tempomture chamber for 4 h. After this time. and while 80 in the low temperature chamber, bend each specimen through 180°.When using the bending fixture, if the membrane is so rigid at low tempetatm that it camiot be betas, the test must be repeated using the manual method. If the manual method is used, perform each bend in 1.0 to 1.5 S. 7.3.9 Ras demes to Avvek wed Watallasrfng-- Got samples its sufficient numbers to perform the following tests atter weathering: a. elongation as described in par.7.3.3 and 7.3.+4, except that only five specimens ctrl needed, since only the MW machine direction shall be tested b, low tempersture impact as described in par.7.3.6, except that the temperature shall be-W t 1`CC c. low temperature flexibility as described in par.7.3.6, except that a 6.4 mm mandrel shall be used. Perform accelerated weathering for 50DO h (Note 4) using either of the following two options (per. $.1). In case of dispute the mferee method shall be option 2. 'On 1: Perform xenon arc exposure in accordance withASTM D 2963 using apparatus Type B. BH or E. Appropriate filters shall be used to simulate the speCtW power distiibudon of natural daylight. For Type B or BH apparatus, use borosilicate glass inner And outer. For Type E apparatus use three Suprax filters. The exposure cycle ahtil be 102 minutes of light and 18 minutes of light and Waren'spray(using deloaized water)at s black panel temperature of 63 f 3°C and a relative humidity of 30 15%. The spectral irradiance shall be 0.35 W/m1 at 340 nm. O t_ p ion 2: Perform fluorescent UV/condensation exposure in occordance with ASTM 0 53 using tTVA-340 bulbs.The exposure cycle shall be 8 h of light and 4 h of condensation,at a black panel temperature of 63 t 3°C and a condensation temperature of 50 f 3°C. Nett 3: The use of glass transition temperature (TI)as cHterion for spec(ftc4tton of PVC mernbmwz shows great promise for furur+e incorporation into this documem. Nott 4:Membranes that will not be exposed to sunlight do not need the same degree of UV stability,if they are property Installed and maintained, A membrane without UV stabilizers is normally less expensive than a membrane with stabilizers. Cowruerbalaaeing this, w,rers must be more vigilant in ensuring that a non-stabilated membrane is not inadvetiently exposed to swnlighl for prolonged periods, e.g. because of shifting of insulation on protected roofing systems or delays in cowrveg a waterproofing application. Considering the advantages and disadvantages, the duration for accelerated weathering can be reduced to 6010 h for Crass A membranes and Class C membranes that will nor be ssposed to sunlight, only if►rwtarally agreed between the supplier and user. t