[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of April 1, 2001]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR177.2910]

[Page 340]
 
                        TITLE 21--FOOD AND DRUGS
 
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN 
                          SERVICES (CONTINUED)
 
PART 177--INDIRECT FOOD ADDITIVES: POLYMERS--Table of Contents
 
 Subpart C--Substances for Use Only as Components of Articles Intended 
                            for Repeated Use
 
Sec. 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)(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).
    (3) 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.
    (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 Sec. 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 with good manufacturing practice so 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  deg.C (70  deg.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 Sec. 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]