Deflection temperature under load DTUL

The most commonly used are the measurement of the Vicat softening point (ASTM D1525, DIN 53460, ISO 306) and the deflection temperature under load (DTUL, ASTM D648). Both measurements monitor the modulus change with temperature, and determine an endpoint when a macroscopic change can... 

Deflection temperature under load (DTUL) is increased... 

The Izod impact, deflection temperature under load (DTUL), and yield strength (YS) of each experimental blend were determined. The results are presented in Table II. 

Yanai et al. (30) demonstrated a definite correlation between data from Accepted ASTM methods and those obtained by TMA. These methods are the deflection temperature under load (DTUL) and the V1CAT softening temperature. The DTUL is determined in the ASTM method by applying a load to the center of a sample that acts as a beam supported at both ends (31I. The Young s modulus of this beam is calculated by... 

The heat distortion temperature (HDT), the deflection temperature under load (DTUL), or the softening temperature are practical and important parameters of a polymeric material. They denote... 

TABLE 11.16 Comparison of Deflection Temperature under Load (DTUL) at 1.8 MPa for ABS Resins from Different Suppliers... 

The sample is deflected to produce a defined surface stress and then placed in a temperature bath at 23°C. The force is allowed to act for 5 min, and then the temperature is raised at a uniform rate of 2°C/min. The deflection of the test bar is continuously observed the temperature at which the deflection reaches 0.010 in. is reported as the heat deflection temperature. This is also known as the heat distortion temperature or the deflection temperature under load (DTUL). 

Material selection for elevated temperature applications. The task of evaluating new materials and projecting their performance for specific applications is a challenging one for engineers and designers. Often materials are supplied with short-term test information such as deflection temperature under load (DTUL) (ASTM D693-03a... 

The deflection temperature under load (DTUL), also called the heat distortion temperature (HDT) of a plastic is a method to guide or assess its load-bearing capacity at an elevated temperature. Details on the method of testing are given in ASTM D648. Basically, a 1.27-cm (i-in.)-deep plastic test bar is mounted on supports 10.16 cm (4 in.) apart and loaded as a beam (see Fig. 2-21). A bending stress of either 66 psi or 264 psi (455 g Pa or 1,820 g Pa) is applied at the center of the span. The test is conducted in a bath of oil, with the temperature increased at a constant rate of 2 C per minute. The DTUL is the temperature at which the sample attains a deflection of 0.0254 cm (0.010 in.). 

DEFLECTION TEMPERATURE UNDER LOAD (DTUL) (ASTM D648)... 

An accepted criterion for describing high-temperature performance of a plastic is the deflection temperature under load (DTUL). This is based on a short-term test that identifies the temperature at which a polymer distorts beyond acceptable limits. It has the limitation of not being able to predict long-term behavior but is a convenient method by which to compare materials. 

Figure 3-29. Effect of Glass Fiber Content on Deflection Temperature Under Load (DTUL) for Two Amorphous Polymers (Polycarbonate and Polystyrene) and Two Crystalline Polymers (High-Density Polyethylene and Nylon 6/6) (Typically, the optimum effect is reached at 20% glass fiber content, with the exception of nylons where 30% is the optimum.)...

TABLE 3-14. CHANGE IN DEFLECTION TEMPERATURE UNDER LOAD (DTUL) OF AMORPHOUS AND CRYSTALLINE POLYMERS WITH THE ADDITION OF 20X GLASS FIBER REINFORCEMENT ... 

TABLE 3-16. MELTING POINTS OF CRYSTALLINE POLYMERS COMPARED WITH THEIR DEFLECTION TEMPERATURES UNDER LOAD (DTUL) WHEN GLASS FIBER REINFORCEMENT IS AOOEO ... 

Effect of Glass-Fiber Content on Deflection Temperature Under Load (DTUL) for Two Amorphous Polymers (Polycarbonate and... 

Melting Points of Crystalline Polymers Compared With Their Deflection Temperatures Under Load (DTUL) When Glass Fiber... 

Heat Deflection Temperature n The temperature at which a material specimen (standard bar) is deflected by a certain degree under specified load. At this temperature, a material achieves a specific modulus which is defined by the applied stress and the sample geometry. Also called heat distortion temperature, heat distortion point, heat deflection point, deflection temperature under load, DTUL, tensile heat distortion temperature, HDT. See also ISO 75. 

ISO 75 An International Organization for Standardization (ISO) standard test method for determination of heat deflection temperature (HDT) and deflection temperature under load (DTUL). HDT is a relative measure of a materials ability to perform for a short time at elevated temperatures while supporting a load. The test measures the effect of temperature on stiffiiess a standard test specimen is given a defined surface stress and the temperature is raised at a uniform rate. Alternate test methods for HDT and DTUL are DIN 53461 and ASTM D648. 

The deflection temperature under load (DTUL) is plotted in Figure 13.9 against the mold temperature. The DTUL at a low load (0.45 MPa) became... 

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