Unnotched Izod impact strength

Unnotched Izod impact strength, ft-lb/in. 2.8 Rockwell indentation, mm 0.057... 

Unnotched Izod impact strength (23°C), ft-lb/in 24 No break No break No break... 

Unnotched Izod Impact strength ASTM D256 ISO 180... 

Table 10.18 Nominal Unnotched Izod Impact Strength of Chevron Phillips Chemical Ryton PPS and Xtel PPS Alloy Compounds from -40°C to 200°C [8]...

Product Code Unnotched Izod Impact Strength in kJ/m at Temperature ... 

Figure 10.108 Unnotched Izod impact strength vs. temperature for Toray Resin Company Torelina PPS resins [12].

Unnotched Izod impact strength in ft-lb/in. (ASTM D690) ... 

Figure 9.13 Effect of glass fiber diameter on the unnotched Izod impact strength of GFRP.

Maximum predicted unnotched Izod impact strength, 190 J/m, was obtained with 10 wt% mica, 68.7 wt% polypropylene, 19.8 wt% Exact 4033, and 1.5 wt% Struktol TR-016. 

UNI Unnotched Izod impact strength (ASTM D 481). UNI can be measured at various temperatures. 

Even after test bars suspended in a forced-air oven at 260 C were heated for six weeks, they retained 60% of their initial tensile strength and 50% of their initial unnotched Izod impact strength. A 10-mil film of this composition was still creasable after six weeks, but broke after eight weeks in the oven at 260 C. When methylhydroquinone was used instead of hydroquinone in a similar composition, however, the film was brittle and black after one day in the oven. 

A comparison of notched and unnotched Izod impact strengths is given in Table 3-1. 

The superior performance of 25% glass-reinforced PVC, 30% glass-reinforced polystyrene in unnotched Izod impact strength, and tensile-impact values (Table 3-1), when compared to work-to-break values at various loading speeds (Figs. 3-5 and 3-9), demonstrate the weakness of the notched Izod test for comparing the toughness of these materials. 

The unnotched Izod impact strengths of thermoplastic resins are generally reduced by the addition of glass fibers. Also, the addition of flame-retardants usually results in decreased impact strength. The glass-reinforced nylon, polycarbonate, and polyurethane resins are regarded as the toughest of the reinforced thermoplastic resins. 

A relative ranking of the unnotched Izod impact strength for glass-reinforced thermoplastic resins in Table 3-1 follows Polyurethane > Nylon 6/10 > Nylon 6 > Nylon 6/6 > Polysulfone > Polyester > PVC > Polyethylene > Polypropylene > SAN > Polystyrene. 

Figure 3-133. Unnotched Izod Impact Strength vs Glass Fiber Content of PE ...

IS Izod Unnotched Izod Impact Strength. The test uses a rectangular bar, which is often injection moulded. One end of the bar is clamped, the sample is struck by a pendulum, with the free-end fractured by the impact. The value obtained is the energy required to break a specified area of material, in kJ/mm. Historically, the value can also be quoted in Joules per metre (J/m). Some flexible polymers do not fracture under test and in such cases a No break result is given. Impact properties are usually quoted at 23°C and at a lower temperature (between -20°C and 40°C) where a rubbery-to-brittle transition could occur at a low service temperature. 

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