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This applies even to those who follow the Sephardic customs and are lenient with glass, as the leniencies do not apply to ceramic.

In cases of extreme necessity (Sha'as HaDchak), such a mug may be used for cold drinks at a meal of the opposite class.

Hot drinks, however, may not be served in a dairy mug during a meat meal, even B'Sha'as HaDchak. Once the meal is finished, in cases of necessity, they may be used.

2) Plastic ware, according to many Poskim, should be treated like ceramic and the above guidelines should be followed.

Other Poskim maintain that it can be treated as glass, and thus may be used interchangeably for Sephardim, and possibly also for Ashkenazim in certain cases of necessity.  (See Shu"t Igros Moshe Orach Chaim Vol. 2 Siman 92 Dibur Hamaschil Keli and Shu"t Minchas Yitzchok Vol. 3 Siman 57. See also Shu"t L'Horos Noson Vol. 6 Siman 69 and Chazon Ovadia, Inyanei Hag'ala 7)

Halachos for Shabbos Kodesh

1) Goblets and glasses that are designated for use with wine or sharp beverages (e.g. whiskey etc.) are best kept Parve and  should not come in contact  with meat or dairy foods.

It is also important to make sure that no crumbs from a dairy or meat meal fall into these wine glasses.

2) Also, these glasses should not be washed or left in a sink with dairy or meat dishes, especially if they will sit there for more than 24 hours. . (See Shulchan Aruch Yoreh Deah Siman 135 and Orach Chaim Siman 451:21)

If they were used in a manner where they came in contact with meat or dairy food, they should be thoroughly washed immediately. (See Rama Yoreh Deah Siman 88:2 and Darchei Teshuva Siman 88:29)

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