3.5 Antifogging performance. Type II glass cleaner shall prevent steam condensation on a glass mirror when tested as follows: Take a glass mirror at least 15.2 cm (6 inches) by 30.5 cm (12 inches) and clean it with cheesecloth in solvent baths in the following order:
a) mineral spirits (naptha)
b) diprpylene glycol monomethyl ether
c) isopropanol and
d) water.
After the water rinse, dry the glass mirror with cheesecloth. To ensure complete cleanliness of the mirror, expose it to live steam. A white highly reflective appearance is taken on by the glass in those areas not thoroughly clean. (If not completely clean, the mirror should be exposed to the entire solvent cleaning procedure again.) Drape one-half of the mirror with a towel and apply the glass cleaner to other half of the mirror. Wipe until the surface is damp and then let dry. Hold mirror 15.2 cm (6 inches) above the steam source and move the mirror back and forth in order to get an even distribution of the steam. The side treated with the glass cleaner shall show no steam condensation when compared to untreated side.
4. Product Conformance. The products provided shall meet the salient characteristics of this commercial item description, conform to the producer’s own drawings, specifications, standards, and quality assurance practices and be the same product offered in the commercial market. The Government reserves the right to require proof of such conformance.
5. Notes.
5.1 The contractor may use his normal quality assurance procedures for manufacture of this product; however, should a disagreement arise between the Government and the manufacturer concerning compliance to the salient characteristics of this commercial item description, the test methods and tests stated in this commercial item description wii be used to determine compliance of the product.
5.2 CSMA methods are available from the Chemical Specialties manufacturers Association, Incorporated. Attn: Member Services Dept., 1913 Eye Street, NW, Washington, DC 20006.
5.3 ASTM standards are available from the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.
PREPARING ACTIVTY
GSA-FSS
|
Reference glass cleaner |
|
|
Ingredient |
Weight percent |
|
isopropanol |
4.0 |
|
dipropylene glycol monomethyl ether |
4.0 |
|
ammoniumhydroxide (26% in water) |
1.0 |
|
Pluronic F 108 |
0.1 |
|
distilled water |
90.0 |
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