Heat Stabilization of Nylon 66

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Heat Stabilization of Nylon 66Nylon 66 resins are susceptible tooxidative and thermal degradationwhen used in applications requiringcontinuous or extended exposure to hightemperatures. Since this exposure willcause a reduction in physicalproperties, specially formulated heatstabilized resins have been developed toprovide additional thermal endurance.The improved retention of physical andelectrical properties has enabled theuse of VYDYNE ® heat-stabilized resinsin applications that involve exposure totemperatures above 185°F/85°C.Figure 1 – Heat-Stabilized Half Life 1 Versus Temperature of Heat-StabilizedVYDYNE Nylon Resins (Nylon 66)100,00040,00010,000Thermal endurance curves comparingphysical properties of VYDYNE heatstabilizedNylon 66 and general purposeNylon 66 are illustrated in Figure 1.Thermal endurance testing measuresthe ability of a material to withstandlong exposures to elevated temperatures.The half life versus temperature curveson Figure 1 may be used to estimatethe maximum continuous service temperatureof a part made from VYDYNEheat-stabilized Nylon 66, given arequired service life.Companies often develop internal specificationsfor physical property retentionof heat-stabilized Nylon 66 resins. Theserequirements and the test methods usedto define them vary from company tocompany. Certain VYDYNE resins havebeen tested under specific customerspecifications. Results are shown inTable 1 and Table 2.Half Life (Hours)1,000100Be aware that as with any heat-stabilizednylon, certain pigments can interactwith the heat stabilizer additive systemcausing adverse affects on the resultingcolor and a loss in heat stabilization.10464(240)392(200)320(160)°F (°C)248(120)176(80)Dielectric Strength, Heat-Stabilized Nylon 66Dielectric Strength, General Purpose Nylon 66Tensile Strength and Tensile Impact, Heat-Stabilized Nylon 66Tensile Strength, General Purpose Nylon 66Tensile Impact, General Purpose Nylon 661Time after which half the original property has been lost at 1/16 in (1.6 mm) thickness.
Table 1 – Typical Values 1 for Property Retention of Heat-Stabilized Nylon 66Mechanical Properties Customer Specification Nylon 66 Heat-Stabilized ValuesTensile Strength (minimum), psi(MPa)DAM 2 11,000(76) 12,000(83)Heat-Aged 3 7,000(48) 9,000(62)Elongation (minimum), %DAM 2 40 60Heat-Aged 4 30 † 50Table 2 – Typical Values 1 for Tensile Strength Retention of Glass-Reinforced, Heat-Stabilized Nylon 66Mechanical Properties Customer Specification Nylon 66 Heat-Stabilized Values13% Glass-Reinforced Nylon 66DAM 2 14,000(96) 17,000(117)Heat-Aged 4 12,500(86 †† ) 18,500(128)33% Glass-Reinforced Nylon 66DAM 2 25,000/(170) 27,000(186)Heat-Aged 4 22,000(152 †† ) 28,000(193)1Typical values are intended as guides only and do not reflect the specification range for a particular property.2Specimens sealed in moisture barrier packages immediately after molding.3Heat conditioning conducted on an air circulating oven at 400°F (204°C) for 84 hours.4Heat conditioning conducted on an air circulating oven at 350°F (177°C) for 48 hours.†Must not decrease by more than 50% of original test value.††Must not decrease by more than 10% of original test value.
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Heat Stabilization of Nylon 66

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