§177.2910 超滤�?Ultra-filtration membranes)

��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;

　　（a� �?� 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.

　　�?� 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�?

　　�?� Ultrafiltration membranes that consist of a microporous poly（vinylidene fluoride� membrane with a hydrophilic surface modifier consisting of hydroxypropyl acrylate/tetraethylene glycol diacrylate copolymer.

　　（b� 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.

　　（c� 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.

　　（d� Ultra-filtration membranes shall be maintained in a sanitary manner in accordance withgood manufacturing practiceso as to prevent potential microbial adulteration of the food.

　　（e� 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 �?0 ��F�?

　　（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.

　　（g� 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]