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| Elvax 40W |
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The composition and physical properties of Elvax 40W are shown in Table 1.
The higher vinyl acetate content of this grade compared with the other Elvax resins results in higher elongation, reduced hardness, improved solubility and adhesion, and significant differences in compatibility.
To minimize viscosity changes in hot melt blends during processing, Elvax 40W also contains butylated hydroxytoluene (BHT).
Elvax 40W is supplied in pellet form and to prevent the pellets from blocking, low levels of an amide wax ("W" additive) have been added to the polymer. |
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Vinyl Acetate (VA) Content, % by weight: 40
Inherent Viscosity at 30'C (0.25 g/100 mL toluene): 0.70
Melt Index, g/10 min (ASTM D1238, modified): 52
Residual VA Monomer, wt%: <0.3
Odor: Slight
Antioxidant, ppm BHT: 550
Tensile Strength,a Mpa (psi): 4.8-6.2 (750-900)
Elongation at Break,a %: 1000-1300
Elastic (Tensile) Modulus a,b Mpa (psi): 3.0 (450)
Density at 23'C (73'F), (ASTM D1505), kg/m3 (g/cc): 965 (0.965)
Hardness, Shore A-2 Durometer, 10 sec (ASTM D2240): 40
Softening Point, Ring and Ball, (ASTM E28), 'C '(F): 104 (220) |
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