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ASTM D6441-05(2016)
Standard Test Methods for Measuring the Hiding Power of Powder Coatings
Automaticky přeložený název:
Standardní metody Test na měření krycí mohutnosti práškových barev
NORMA vydána dne 1.4.2016
Informace o normě:
Označení normy: ASTM D6441-05(2016)
Poznámka: NEPLATNÁ
Datum vydání normy: 1.4.2016
Kód zboží: NS-635694
Počet stran: 8
Přibližná hmotnost: 24 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM D6441-05(2016) :
Keywords:
contrast ratio, hiding power, opacity, powder coatings,, ICS Number Code 87.040 (Paints and varnishes)
Doplňující informace
| Significance and Use | ||||||||||||||||||
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5.1 Contrast ratio at a specified film thickness is a useful hiding power parameter for production control and purchasing specifications. 5.2 The greater the hiding power, the less coating is required per unit area to obtain adequate hiding. Knowledge of hiding power is therefore important in regard to coating costs and for comparing coating value. |
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| 1. Scope | ||||||||||||||||||
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1.1 These test methods determine and report the hiding power of a powder coating with respect to two parameters: 1.1.1 Test Method A—Contrast Ratio at a given film thickness 1.1.2 Test Method B—Film thickness at 0.98 (98 %) contrast ratio. Note 1: The measured parameters follow powder coating industry
practice by measuring hiding power in relation to film thickness,
rather than the “Spreading Rate” function employed in Test Methods
D344 and D2805 and other hiding power test
methods.
Note 2: Hiding power is photometrically defined as the
spreading rate at 0.98 contrast ratio. See definitions of spreading
rate and hiding power in Terminology D16, D2805, and the Paint and Coatings Testing
Manual.
Note 3: The contrast ratio 0.98 is conventionally accepted in
the coatings industry as representing “complete” hiding for
reflectometric hiding power measurements. But visually, as well as
photometrically, it is slightly less than complete.
1.2 These test methods cover the determination of the hiding power of powder coatings applied by electrostatic spraying. 1.3 These test methods determine hiding power by means of reflectometric and thickness gage measurements. They are limited to coatings having a minimum CIE-Y reflectance of 15 %. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices, and to determine in advance the applicability of regulatory limitations prior to use. |
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| 2. Referenced Documents | ||||||||||||||||||
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