1、 NSF Protocol P156 Commercial Coffee Equipment Cleaners Health and Performance September 18, 2002 NSF P156 i 2002 NSF NSF International, an independent, not-for-profit organization, is dedicated to public health safety and protection of the environment by developing standards, by providing education
2、 and by providing superior third-party conformity assessment services while representing the interest of all stakeholders. This Protocol is subject to revision. Contact NSF to confirm this revision is current. Users of this Protocol may request clarifications and interpretations, or propose revision
3、s by contacting: NSF International 789 N. Dixboro Road Ann Arbor, MI 48105 Phone: (734)769-8010 Telex: 753215 NSF INTL FAX: (734)769-0109 E-mail: infonsf.org Web: http:/www.nsf.org NSF P156 ii 2002 NSF September 18, 2002 NSF Protocol P156 Commercial Coffee Equipment Cleaners Health and Performance P
4、rotocol Developer NSF International Engineering Rinsing instructions; Recommended frequency of use. 4 Methods 4.1 Cleaner Corrosion Test 4.1.1 Summary: This test determines the impact of a cleaning solution on visible corrosion of materials typically used in commercial coffee equipment. Plaques of s
5、tainless steel are partially immersed in cleaning solution, rinsed, allowed to dry, and observed for visible corrosion products. 4.1.2 Materials: The following items shall be used in the testing: 2” x 8” (5.1 x 20.3 cm) 304-grade stainless steel plaques (2B finish) 600 mL tall form glass beakers (Py
6、rex No. 1060 or equivalent) clamps and ring stands for holding plaques pH meter (calibrated) 4.1.3 Preparation: The cleaning solution shall be made according to manufacturers instructions and 500 mL shall be placed into the 600 mL beaker. Stainless steel plaques shall be rinsed with deionized water
7、and air dried prior to use. 4.1.4 Exposure, Rinsing and Observations: Each plaque shall be suspended above the beaker such that 4 inches (10.2 cm) in the long direction are immersed in the cleaning solution (i.e. 4” above the water line). Plaques shall remain in the solution in this fashion for 24 h
8、ours. Plaques shall then be removed, rinsed in tap water for 1 minute and allowed to air dry for 24 hours. Plaques shall then be visually inspected for evidence of NSF P156 3 2002 NSF red or white corrosion products, in a room with a minimum of 220 lux (20 foot-candles) at the work surface. The expo
9、sed section (4” x 2”) shall be directly compared with the unexposed portion of the plaque. 4.1.5 Replication: Triplicate test plaques shall be used for each cleaning solution. 4.2 Cleaning Performance Test 4.2.1 Summary: This test determines the ability of a cleaning solution to remove visible depos
10、its of coffee residue from materials typically used in commercial coffee equipment. Samples of stainless steel, glass, and polycarbonate are (1) soiled with a concentrated coffee solution, (2) placed into container and allowed to soak in the cleaning solution per manufacturers instructions, and (3)
11、swirled, rinsed, allowed to dry, and (4) observed for residual visible coffee residue. 4.2.2 Materials: The following items shall be used in the testing: Regular fresh-ground coffee (available at grocery stores) Exposure container, 20 cm (8 inch) diameter, 20 cm (8 inch) height (example: Fisher bran
12、d 4.9L Multipurpose Disposable Containers available from Fisher Scientific, phone 800-766-7000) 10-15 cm diameter, 1 cm depth (4-6 inch diameter, 0.5 in.) 304 grade #4 finish stainless steel dish 100-150 mm (4-6 inch) glass petri dish (example: Pyrex Brand 3160 Petri Dishes from Cole-Parmer, phone 8
13、00-323-4340) 100-150 mm (4-6 inch) polycarbonate petri dish (example: Nalgene Autoclavable PC Petri Dish from Cole-Parmer, phone 800-323-4340) 12 cup coffee filters cup cake style 4.2.3 Application of Concentrated Coffee Solution to Test Samples: A concentrated coffee solution shall be made by placi
14、ng 110 grams (3.9 ounces) of coffee into 1 liter of tap water. The solution shall be heated to 93oC (200oF), held for 4 0.25 minutes, then poured through a coffee filter to remove spent coffee grounds prior to use. Test dishes shall be heated for 2 0.25 hours in an oven to 82oC (180oF) prior to use.
15、 Twenty (20) mL of concentrated coffee solution shall be transferred into each test dish, placed into the 82oC (180oF) oven and allowed to dry for two hours. Then test dishes will be allowed to cool to room temperature for a minimum of 2 hours. The process shall be repeated to accumulate two coats o
16、f dried coffee residue on each test sample. Control dishes shall not receive coffee solution and will be used to compare cleanliness with the test dishes. 4.2.4 Exposure to Cleaning Solution and Observations: Cleaning solution shall be made according to manufacturers instructions, including temperat
17、ure specifications (if manufacturer recommends hot or boiling water, the temperature shall be 49oC (120oF). Each test dish shall be placed into individual containers with 3L cleaning solution and allowed to soak for the time recommended in the manufacturers instructions. Dishes shall then be swirled
18、 gently in the solution three times, removed from solution, rinsed in cold tap water for 1 minute, inverted, and allowed to air dry overnight (minimum 12 hours). Test and control dishes shall then be visually inspected for coffee residue in a room with a minimum of 220 lux (20 foot-candles) at the w
19、ork surface. NSF P156 4 2002 NSF 4.2.5 Replication: Triplicate test dishes shall be used for each material (stainless, glass, polycarbonate) and each cleaning solution. Triplicate control dishes shall also be used for visual comparison with test dishes. NSF P156 5 2002 NSF Annex A Program Specific P
20、olicies for NSF Protocol P156 Commercial Coffee Equipment Cleaners Health and Performance A.1 Marking the product In addition to that required in the NSF Certification Policies for NSF Protocols and Non-NSF Standards, certified individual products or packaging materials shall bear the following info
21、rmation: A.2 Annual audits Audits of all facilities and production locations shall be conducted by NSF at least annually. Audits will cover the following basic items: No changes in labeling or product literature (referencing NSF or NSF mark) without prior approval; No change in formulation without prior approval by NSF; Recordkeeping. A.3 Re-evaluation Re-evaluation of certified formulations shall occur every five years. NSF Protocol P156 Commercial Coffee Equipment Cleaners Health and Performance
