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NIST640F

Line Position And Line Shape Standard for Powder Diffraction

(Silicon powder), NIST® SRM® 640F

Synonym(s):

Silicon powder, Silicone powder

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About This Item

UNSPSC Code:
41116107

form

powder

packaging

pkg of 7.5 g

manufacturer/tradename

NIST®

technique(s)

diffraction/scattering: suitable

General description

The Standard Reference Material (SRM) was prepared from ultra-high purity, intrinsic silicon boules that were crushed and jet milled to a median particle size of 4.1μm. The resulting powder was then annealed under gettered argon at 1000 °C for two hours and bottled under argon.

SRM 640F_cert

SRM 640F_SDS

Application

This SRM is intended for use as a standard for calibration of diffraction line positions and line shapes, determined through powder diffractometry.

Features and Benefits

  • A unit of SRM 640f consists of approximately 7.5 g of silicon powder bottled under argon.
  • Analysis of X-ray powder diffraction data indicated that the SRM material is homogeneous with respect to diffraction properties.
  • SRM 640f was bottled under argon to protect against humidity.
  • The certification data was analyzed using the FPA method with Pawley refinements as implemented in TOPAS.
  • Expiration details and storage instructions are available in the NIST certificate.

Other Notes

Please download a current certificate at nist.gov/SRM for current analytes and certified values.

Legal Information

NIST is a registered trademark of National Institute of Standards and Technology
SRM is a registered trademark of National Institute of Standards and Technology

pictograms

Flame
GHS02

signalword

Warning

hcodes

H228

Hazard Classifications

Flam. Sol. 2

Storage Class

4.1B - Flammable solid hazardous materials

wgk_germany

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

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Certificates of Analysis (COA)

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Questions

1–2 of 2 Questions  

  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

      Helpful?

  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

      Helpful?

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