§177.2910 Ultra-filtration membranes
Ultra-filtration membranes identified in paragraphs （a）（1）, （a）（2）, （a）（3）, and （a）（4） of this section may be safely used in the processing of food, under the following prescribed conditions;
?。╝） （1） Ultra-filtration membranes that consist of paper impregnated with cured phenol-formaldehyde resin, which is used as a support and is coated with a vinyl chloride-acrylonitrile copolymer.
（2） Ultra-filtration membranes that consist of a sintered carbon support that is coated with zirconium oxide （CAS Reg. No. 1314-23-4） containing up to 12 percent yttrium oxide （CAS Reg. No. 1314-36-9）.
?。?） Ultra-filtration membranes that consist of an aluminum oxide support that is coated with zirconium oxide （CAS Reg. No. 1314-23-4） containing up to 5 percent yttrium oxide （CAS Reg. No. 1314-36-9）.
（4） Ultrafiltration membranes that consist of a microporous poly（vinylidene fluoride） membrane with a hydrophilic surface modifier consisting of hydroxypropyl acrylate/tetraethylene glycol diacrylate copolymer.
?。╞） Any substance employed in the production of ultra-filtration membranes that is the subject of a regulation in parts 174, 175, 176, 177, 178 and § 179.45 of this chapter conforms with the specifications of such regulation.
?。╟） Ultra-filtration membranes are used in the physical separation of dissolved or colloidally suspended varying molecular size components of liquids during the commercial processing of bulk quantities of food.
?。╠） Ultra-filtration membranes shall be maintained in a sanitary manner in accordance with good manufacturing practice so as to prevent potential microbial adulteration of the food.
?。╡） Ultrafiltration membranes identified in paragraph （a）（4） may be used to filter aqueous or acidic foods containing up to 13 percent of alcohol at temperatures not to exceed 21 °C （70 °F）.
?。╢） To assure safe use of the ultra-filtration membranes, the label or labeling shall include adequate directions for a pre-use treatment, consisting of conditioning and washing with a minimum of 8 gallons of potable water prior to their first use in contact with food.
?。╣） Acrylonitrile copolymers identified in this section shall comply with the provisions of § 180.22 of this chapter.
[42 FR 14572, Mar. 15, 1977, as amended at 53 FR 17925, May 19, 1988; 58 FR 48599, Sept. 17, 1993; 60 FR 54426, Oct. 24, 1995]
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