Results 241 to 250 of about 263,653 (296)

Tear Strength of Four Irreversible Hydrocolloid Impression Materials

Journal of Prosthodontics, 1998
Purpose The purpose of this investigation was to examine the tear strength of four irreversible hydrocolloid (alginate) impression materials (Tare‐Free Alg, Jeltrate, Identic, and Kromopan).Materials and Methods Eighty specimens, 20 for each alginate tested, were according to the manufacturers' instructions. A cutting die described in American Standard
B I, Cohen, M K, Pagnillo, B L, Musikant, A S, Deutsch   +3 more
exaly   +3 more sources

Tear strength of polyethylene

Journal of Materials Science, 1984
The fracture energy of moulded sheets of polyethylene has been found to depend strongly upon the thickness of the sheet, increasing linearly over the range 0.05 to 1.0 mm. This variation is attributed to a dependence of the volume of the plastic zone at the crack tip upont2, wheret is the torn thickness.
D. -S. Chiu, A. N. Gent, J. R. White
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Tear strength of elastomeric impression materials

The Journal of Prosthetic Dentistry, 1978
1. Under simulated clinical conditions the maximum tear strength of those materials tested was reached in 10 to 15 minutes. 2. The polysulfide materials showed three to six times the tear strength of the silicones. 3. The polyether material displayed a tear resistance slightly higher than that of the silicones but one third to one fifth as high as that
T W, Herfort, W W, Gerberich, C W, Macosko, R J, Goodkind   +3 more
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Tear strength and tensile strength of model filled elastomers

Journal of Polymer Science: Polymer Physics Edition, 1980
AbstractMeasurements have been made of the tear strength, tensile strength, and energy dissipated during stretching for model filled elastomers consisting of polybutadiene with glass beads incorporated. The glass beads were pretreated with various silanes, some of which could, in principle, form covalent bonds with the polybutadiene matrix during free ...
P. Dreyfuss, A. N. Gent, J. R. Williams
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Analysis of Tear Strength

Textile Research Journal, 1947
An analysis has been made of the factors involved in the A.S.T.M. Trapezoid Tear-Strength Test. The tear strength of a fabric measured by this test is dependent mainly on the extensibility of the threads, the breaking strength of the threads, the effective specimen length, and the number of threads per inch of fabric.
O.B. Hager, D.D. Gagliardi, H.B. Walker
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Threshold tear strength of elastomers

Journal of Polymer Science: Polymer Physics Edition, 1982
AbstractTear strengths have been measured for a wide variety of molecular networks under threshold conditions; i.e., at high temperatures, low rates of tearing, and with swollen samples. For all of the polymers examined, the threshold tear strength was found to be proportional to the square root of the average molecular weight Mc of network strands, in
A. N. Gent, R. H. Tobias
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Tear Strength of Stretched Rubber

Rubber Chemistry and Technology, 1978
Abstract Highly stretched rubber sheets can be split apart quite easily, indicating that the originally isotropic material becomes “fibrous” in character—i.e., much weaker for a tear running in the direction of extension than for one running at right angles to it. This anisotropy of strength is shown most clearly by elastomers which crystallize
A. N. Gent, H. J. Kim
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Tear Strength of Non-aqueous Impression Materials

Journal of Dental Research, 1984
Examples from each of the four major groups of dental impression materials (polysulfides, polyethers, condensation polysiloxanes, and addition polysiloxanes) were subjected to a trouser-leg tear test. Tear energies were determined, and materials were ranked with respect to each other.
S C, Keck, W H, Douglas
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The Tear Strength of Vulcanizates

Rubber Chemistry and Technology, 1960
Abstract 1) The force acting upon the jaws of the tear testing machine is always measured in tear strength tests and its value serves as a criterion of the tear resistance. This force, measured at the instant of completion of the tear, is made up of the force necessary for tear propagation in the notch together with the force needed to produce ...
Primus Kainradl, Franz Handler
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Tear strength of oriented crystalline polymers

Journal of Materials Science, 1986
Three crystalline polymers; high- and low-density polyethylene andtrans-polyisoprene; were prepared as sheets with varying degrees of molecular orientation. Measurements of the energyG c required to propagate a tear along and across the direction of orientation are described.
A. N. Gent, J. Jeong
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