ISO 3597-1:2003(E) 5.1.5 Circulating-air oven, for curing and/or post-curing the resin at the recommended temperature. 5.1.6 5.1.7 Heating device and suitable glassware, if boiling-water pretreatment of the test specimens is required. 5.1.8 Former (see Figure 2), with a circumference of 1 m, for winding a hank of rovings. 2 3 5 Key tensioning rolls 4 attachmentpoint for wire or yarn loop roll (optional) 5 hank of rovings 2 3 roving bobbin 6 cut ends Each side 1/6 m. Figure2—Windingahankof rovings 5.2Preparationofhanksofrovings the specimens produced. Then use Equation (2) to calculate the number of turns N of roving which will have to be wound on the former to give this mass. To calculate N, it is necessary to know the mass per unit length of the rovings. This is usually stated by the manufacturer (the tex value, in g·km-1). NOTE The mass per unit length can be determined using Iso 188g[1]. ISO2003—All rights reserved cational Organization for Standardization Not for Resa ISO 3597-1:2003(E) Because it will generally only be possible to wind complete metre lengths on to the former, round up to the nearest whole number. Wi nd? ×/ (1) 4 m ×1000 (2) tex where m is the mass, in grams, of the hank of rovings; Wf is the glass content, in percent by mass; d is the density, in grams per cubic centimetre, of the glass; Wr is the resin content, in percent by mass (without voids, wr = 100 -w); d is the density, in grams per cubic centimetre, of the resin; d is the inside diameter, in millimetres, of the mould; 1 is the length of the hank drawn into the mould; tex is the mass per unit length, in grams per kilometre, of the roving. the roving from the wheel by cutting it on one side of the former. The bundle of roving fibres obtained will be O,5m.Cutthehanktolengthif amouldshorterthanthis isbeingused.Checkthemassofthehank.lnsome yarn to the loop end at the point shown in Figure 2. The wire or yarn keeps the fibres together and shall be of sufficient length to pull the hank from the resin bath into the mould. Take care to minimize handling of the necessary to condition them before use. If not, condition for at least 16 h in one of the standard atmospheres specified in ISO 291. 5.3 Preparationofrods the rovings have been conditioned, pour the resin into the impregnating bath(s) enable air bubbles to escape, push the rovings gently (avoiding damage) to the bottom of the bath with a plastic spoon or wooden stirrer. The wire or yarn connected to the hank shall be kept out of the bath. Because deficiencies in impregnation may cause considerable scatter in test results, care is necessary in this operation. The hank of rovings shall be completely impregnated before it is pulled into the mould. Good-quality impregnation is characterized by the absence of trapped air bubbles and usually the apparent disappearance of the fibres in the resin as wet-out occurs. The impregnation time shall be at least 10 min in all cases. With 5 Not for Resale ISO3597-1:2003(E) After impregnation, pull the hank of rovings into the mould. Adjust the pulling speed so that excess resin and air bubbles are expelled steadily and continuously. When the hank is in the mould, it is recommended that the The number of rods made will depend on their length and the number of tests to be performed. For each of the three types of test (flexural, compressive and interlaminar shear), a minimum of eight specimens shall be tested. Furthermore, besides testing the rods "as-moulded", testing can also be performed after boiling specimens in water or another medium.Different immersion times can be used.For each type of pretreatment orsetoftestconditions,anothersetofspecimenswillbenecessary.Thenumberofspecimensineachset may be tested to permit statistical analysis of the results. 5.4 Curing the rod Cure the rod in the mould. Support the mould in the horizontal position in the curing oven (5.1.5). The curing and post-curing conditions shall be as specified for the resin system used. The curing