Delft test

ISO 34-2 1996 Rubber, vulcanized or thermoplastic - Determination of tear strength -Part 2 Small (Delft) test pieces... 

Tear test pieces are normally stamped from sheet with an appropriate die (see Chapter 4) and then a nick cut if required, although with the Delft test piece both operations are usually done simultaneously. 

Figure 8-21. Cross section of die-cut tear test pieces, (a) Nicked crescent test piece (b) Delft test piece, w = effective width of untom portions.

In ISO 34-2, the result for the Delft test piece is expressed as the force to tear a test piece of standard width and thickness, corrections for variation within tolerance of width and thickness being given ... 

Part 1 Trouser, angle, and crescent test pieces Part 2 Small (delft) test pieces Standard test method for tear strength of conventional vulcanized rubber and thermoplastic elastomers Testing of rubber and elastomers Determination of the tear strength of elastomers Trouser test piece... 

Other standards similar to the above are as follows. ISO 34. 1994 (= BS 903 A3, 1995). Rubber, vulcanized or thermoplastic -Determination of tear strength. Part 1. TroiKser. angle and crescent test pieces. ISO 816, 1983. Rubber, vulcanized Determination of tear strength of small test pieces (Delft test pieces). Here, the force required to tear across the width of a small test piece (2 x 9 x 60 mm) containing a 5 mm wide slit in the center of the specimen is measured. 

Hanstveit R (2003a) Trichloromethylstannane (CAS 993-16-8) Determination of the ready biodegradability in a manometric respiration test Delft, TNO, September (Repert Ne. V2492/01). 

TNO Dutch Fire Test Laboratory Delft, Netherlands... 

Toda, E., Tong, W., van Delft, J.H., Weis, B. and Schechtman, L.M. (2006) Validation of toxicogenomics-based test systems ECVAM-ICCVAM/NICEATM considerations for regulatory use. Environmental Health Perspectives, 114, 420-429. 

With crescent, Delft and angle test pieces only the maximum force reached is recorded, although the change of force along the short tear path could be obtained with a force measuring and recording system having very... 

The quantity directly measured in a tear test is the force on the test piece during testing. Particularly with the trouser method, this force will fluctuate along the tear path. ISO 34 takes the maximum force reached in the case of crescent, angle and Delft methods but for the trouser method a median force is determined in accordance with procedures given in ISO 6133147, Analysis of multi-peak traces obtained in determinations of tear strength and adhesion strength. 

Wash trials are carried out by the use of soiled test pieces, eg, commonly used stains for protease evaluation are milk, blood, and grass. Commercial pre-soiled test pieces also may contain particulate matter, eg, carbon black, as part of the stain matrix. Test materials are available ready-to-use from a number of research and testing institutes in Europe and the United States, eg, Center for Testmaterials, Vlaardingen, Holland Wascherei Forschungs Institut, Krefeld, Germany EMPA, St. Gallen, Switzedand Institut voor Reinigingstechnieken TNO, Delft, Holland and Testfabrics, Middlesex, New Jersey. Alternatively, enzyme manufacturers can supply preparation procedures. 

To test the predictions, experiments were carried out at the Delft University of Technology (TUD) (Ballard et al., 2001). In CSMGem, the pressure versus temperature phase diagram was generated using the model and then confirmed by experimental data. Figure 5.19 is the pressure versus temperature diagram for a 30/70 mixture of ethane and propane in contact with excess water. 

NEN 7343 (1995) Leaching Characteristics of Solid Earthy and Stony Building and Waste Materials. Leaching Tests. Determination of the Leaching of Inorganic Components from Granular Materials with the Column Test, Netherlands Normalization Institute, Delft, Netherlands. 

The two most commonly specified tests are the Die C test and the "trouser tear" (D470) test. Both of these tests measure resistance to tear propagation. Other test shapes include the crescent tear with or without end tabs. This sample shape is often nicked. The "Delft" (IS0816) sample with its internal nick is often used from samples taken from finished products. The exact size of the nick does not appear to be critical to the result. 

We consider all these field tests still to be preliminary. They will have to be repeated on a larger scale and in different locations and countries before a complete picture can be gained. The work on Spodoptera exigua in Holland was done in collaboration with W.J. Nooijen of the Delft group and C. van der Kraan and S. Voermanof the Institute for Pesticide Research in Wageningen. 

Vergunst, Th. Carbon coated monolithic catalysts—preparation aspects and testing in the three-phase hydrogenation of cinnantaldehyde. 1999, PhD Thesis, Delft University of Technology. 

Delft University of Technology carried out a series of experiments in a counterflow moving bed filter similar to that for Combustion Power Company but employed a simpler feed system for the granular media [9]. These tests indicated acceptable collection efficiencies only at relatively low filter velocities. 

In the framework of co-operation between the partner institutes IVD (University of Stuttgart) and the section Thermal Power Engineering (Technical University Delft, TUD) TUD has carried out experimental work at IVD. These experiments have been performed with the advanced staged combustion (DWSA) installation. The maximum thermal capacity of this test rig is ca. 50 kW. Also measurements have been performed using the Delft pressurised fluidised bed (PFBG) test rig with a maximum thermal capactity of ca. 1.5 MW. 

Figure 2 presents the PFBG test installation at Delft university. 

The experimental results obtained using the Delft PFBG test rig are presented in the form of graphs. The fuel used for the gasification experiments is pelletised Miscanthus in all cases presented. Dolomite is added to the fuel in a mass ratio of ca. 0.03-0.05. Steam to air ratio is 0,04-0.11 in these tests... 

The ceramic filter unit in the Delft PFBG test rig has been operated for more than 100 hours under gasification conditions. They had to be exchanged once in the period for which the data presented here have been obtained. This was necessary, as due to opening of the unit to exchange a probe severe air leakage caused filter fire and... 

The test rig at IVD (50 kWth) and the Delft PDU (1.5 MWth) were operated successfully with respect to pressurised gasification, high temperature gas cleanup and combustion of biomass (wood and Miscanthus) and brown coal derived LCV gas. 

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