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§177.1830 苯乙?甲基丙烯酸甲酯共聚物(Styrene-methyl methacrylate copolymers)

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放大字体缩小字体2011-10-12 06:49:54 来源9a href="http://www.law.cornell.edu/cfr/text/21/177/1830" target="_blank" rel="nofollow">GPO浏览次数9span id="hits">2924
核心提示:本节中所指的苯乙?甲基丙烯酸甲酯共聚物由苯乙烯和甲基丙烯酸共聚而成。在本章176.170(c)表1和表2中所规定的温?时间条件下浸提,所得浸提物量应不超过下述规定:总不挥发浸提物不得超?.0465mg/cm2测试表面积,高锰酸钾可氧化的蒸馏水?%乙醇?0%乙醇的浸提物,吸光度不得超过0.15;紫外可吸收的蒸馏水?%乙醇?0%乙醇的浸提物,吸光度不得超过0.3;紫外可吸收的正庚烷浸提物,吸光度不得超?.4、/div>
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备注 本节中所指的苯乙?甲基丙烯酸甲酯共聚物由苯乙烯和甲基丙烯酸共聚而成。在本章176.170(c)表1和表2中所规定的温?时间条件下浸提,所得浸提物量应不超过下述规定:总不挥发浸提物不得超?.0465mg/cm2测试表面积,高锰酸钾可氧化的蒸馏水?%乙醇?0%乙醇的浸提物,吸光度不得超过0.15;紫外可吸收的蒸馏水?%乙醇?0%乙醇的浸提物,吸光度不得超过0.3;紫外可吸收的正庚烷浸提物,吸光度不得超?.4、/td>

  177.1830 Styrene-methyl methacrylate copolymers.


  Styrene-methyl methacrylate copolymers identified in this section may be safely used as components of plastic articles intended for use in contact with food, subject to the provisions of this section.

  (a For the purpose of this section, styrene-methyl methacrylate copolymers consist of basic copolymers produced by the copolymerization of styrene and methyl methacrylate such that the finished basic copolymers contain more than 50 weight percent of polymer units derived from styrene.

  (b The finished plastic food-contact article, when extracted with the solvent or solvents characterizing the type of food and under the conditions of time and temperature characterizing the conditions of intended use as determined from tables 1 and 2 of 176.170(c of this chapter, yields extractives not to exceed the following when tested by the methods prescribed in 177.1010(c ;

  ? Total nonvolatile extractives not to exceed 0.3 milligram per square inch of surface tested.

  ? Potassium permanganate oxidizable distilled water and 8 and 50 percent alcohol extractives not to exceed an absorbance of 0.15.

  ? Ultraviolet-absorbing distilled water and 8 and 50 percent alcohol extractives not to exceed an absorbance of 0.30.

  ? Ultraviolet-absorbing n- heptane extractives not to exceed an absorbance of 0.40.

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