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<a href="/standards" class="usa-nav__link">Standards</a>
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</div>
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<li class="usa-nav__submenu-item">
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<a href="/adlp" class="usa-nav__link">Assoc Director of Laboratory Programs</a>
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<a href="/laboratories" class="usa-nav__link">Laboratories</a>
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<a href="/ctl" class="usa-nav__link">Communications Technology Laboratory</a>
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<a href="/el" class="usa-nav__link">Engineering Laboratory</a>
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<a href="/itl" class="usa-nav__link">Information Technology Laboratory</a>
|
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<a href="/mml" class="usa-nav__link">Material Measurement Laboratory</a>
|
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<li>
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<a href="/pml" class="usa-nav__link">Physical Measurement Laboratory</a>
|
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</ul>
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<ul class="usa-nav__submenu-list">
|
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<a href="/ncnr" class="usa-nav__link">NIST Center for Neutron Research</a>
|
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<li>
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<a href="/cnst" class="usa-nav__link">CNST NanoFab</a>
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<a href="/laboratories/projects-programs" class="usa-nav__link">Research Projects</a>
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<a href="/laboratories/tools-instruments" class="usa-nav__link">Tools & Instruments</a>
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<a href="/major-programs" class="usa-nav__link">Major Programs</a>
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<a href="/baldrige" class="usa-nav__link">Baldrige Performance Excellence Program</a>
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<a href="/chips" class="usa-nav__link">CHIPS for America Initiative</a>
|
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<li>
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<a href="/mep" class="usa-nav__link">Manufacturing Extension Partnership (MEP)</a>
|
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</li>
|
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<li>
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<a href="/oam" class="usa-nav__link">Office of Advanced Manufacturing</a>
|
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<li>
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<a href="/spo" class="usa-nav__link">Special Programs Office</a>
|
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<li>
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<a href="/tpo" class="usa-nav__link">Technology Partnerships Office</a>
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<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-4"><span>Services & Resources</span></button>
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<a href="/content/standards-measurements" class="usa-nav__link">Standards and Measurements</a>
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<a href="/calibrations" class="usa-nav__link">Calibration Services</a>
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<a href="/nvlap" class="usa-nav__link">Laboratory Accreditation (NVLAP)</a>
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<a href="/nist-quality-system" class="usa-nav__link">Quality System</a>
|
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<li>
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<a href="/srm" class="usa-nav__link">Standard Reference Materials (SRMs)</a>
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<li>
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<a href="/sri" class="usa-nav__link">Standard Reference Instruments (SRIs)</a>
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<li>
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<a href="/standardsgov" class="usa-nav__link">Standards.gov</a>
|
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<a href="/pml/time-and-frequency-division/time-services" class="usa-nav__link">Time Services</a>
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<a href="/pml/owm" class="usa-nav__link">Office of Weights and Measures</a>
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<a href="/data" class="usa-nav__link">Data</a>
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<a href="https://webbook.nist.gov/chemistry/" class="usa-nav__link">Chemistry WebBook</a>
|
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<a href="https://nvd.nist.gov/" class="usa-nav__link">National Vulnerability Database</a>
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<a href="/pml/productsservices/physical-reference-data" class="usa-nav__link">Physical Reference Data</a>
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<a href="/srd" class="usa-nav__link">Standard Reference Data (SRD)</a>
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<a href="/tpo" class="usa-nav__link">License & Patents</a>
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<a href="https://csrc.nist.gov/" class="usa-nav__link">Computer Security Resource Center (CSRC)</a>
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<a href="/nist-research-library" class="usa-nav__link">NIST Research Library</a>
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</ul>
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</div>
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<li class="usa-nav__primary-item">
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<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-5"><span>News & Events</span></button>
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<a href="/news-events/news" class="usa-nav__link">News</a>
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<a href="/news-events/events" class="usa-nav__link">Events</a>
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<a href="/blogs" class="usa-nav__link">Blogs</a>
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<a href="/feature-stories" class="usa-nav__link">Feature Stories</a>
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<a href="/awards" class="usa-nav__link">Awards</a>
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<a href="/video-gallery" class="usa-nav__link">Video Gallery</a>
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<a href="/image-gallery" class="usa-nav__link">Image Gallery</a>
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<a href="/pao/media-contacts" class="usa-nav__link">Media Contacts</a>
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<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-6"><span>About NIST</span></button>
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<a href="/about-nist" class="usa-nav__link">About Us</a>
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<a href="/director/leadership" class="usa-nav__link">Leadership</a>
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<li>
|
|||
|
|
<a href="/about-nist/budget-planning" class="usa-nav__link">Budget & Planning</a>
|
|||
|
|
</li>
|
|||
|
|
</ul>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-nav__submenu-item">
|
|||
|
|
<a href="/about-nist/contact-us" class="usa-nav__link">Contact Us</a>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-nav__submenu-item">
|
|||
|
|
<a href="/about-nist/visit" class="usa-nav__link">Visit</a>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-nav__submenu-item">
|
|||
|
|
<a href="/careers" class="usa-nav__link">Careers</a>
|
|||
|
|
<ul class="usa-nav__submenu-list">
|
|||
|
|
<li>
|
|||
|
|
<a href="/iaao/academic-affairs-office" class="usa-nav__link">Student programs</a>
|
|||
|
|
</li>
|
|||
|
|
</ul>
|
|||
|
|
</li>
|
|||
|
|
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
|||
|
|
<li class="usa-nav__submenu-item">
|
|||
|
|
<a href="/about-nist/work-nist" class="usa-nav__link">Work with NIST</a>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-nav__submenu-item">
|
|||
|
|
<a href="/history" class="usa-nav__link">History</a>
|
|||
|
|
<ul class="usa-nav__submenu-list">
|
|||
|
|
<li>
|
|||
|
|
<a href="http://nistdigitalarchives.contentdm.oclc.org/" class="usa-nav__link">NIST Digital Archives</a>
|
|||
|
|
</li>
|
|||
|
|
<li>
|
|||
|
|
<a href="/nist-museum" class="usa-nav__link">NIST Museum</a>
|
|||
|
|
</li>
|
|||
|
|
<li>
|
|||
|
|
<a href="/nist-and-nobel" class="usa-nav__link">NIST and the Nobel</a>
|
|||
|
|
</li>
|
|||
|
|
</ul>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-nav__submenu-item">
|
|||
|
|
<a href="/education" class="usa-nav__link">Educational Resources</a>
|
|||
|
|
</li>
|
|||
|
|
</ul>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</li>
|
|||
|
|
</ul>
|
|||
|
|
</div>
|
|||
|
|
</nav>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</header>
|
|||
|
|
<!-- nist-index-ignore-end -->
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
<div class="grid-container">
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div
|
|||
|
|
id="block-nist-www-content" class="nist-block"
|
|||
|
|
>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<section
|
|||
|
|
class="nist-page__content usa-section clearfix"
|
|||
|
|
>
|
|||
|
|
|
|||
|
|
<a id="main-content" tabindex="-1"></a>
|
|||
|
|
|
|||
|
|
<div
|
|||
|
|
class="nist-page__region nist-page__region--content-top-full"
|
|||
|
|
>
|
|||
|
|
<div
|
|||
|
|
class="nist-block"
|
|||
|
|
>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div class="nist-section-header nist-section-header--765511 nist-section-header--menu nist-section-header--interior">
|
|||
|
|
<div class="nist-section-header__main grid-container">
|
|||
|
|
<div class="nist-section-header__title">
|
|||
|
|
<h2><a href="/nvlap">National Voluntary Laboratory Accreditation Program (NVLAP)</a></h2>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div class="grid-container margin-top-4">
|
|||
|
|
<div class="grid-row grid-gap-6">
|
|||
|
|
|
|||
|
|
<aside class="nist-page__region nist-page__region--sidebar-first tablet-lg:grid-col-4 desktop-lg:grid-col-3">
|
|||
|
|
<div>
|
|||
|
|
<!-- nist-index-ignore-start -->
|
|||
|
|
<div
|
|||
|
|
class="views-element-container nist-block nist-block--section-nav" data-elastic-exclude=""
|
|||
|
|
>
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div><div class="js-view-dom-id-8408a1cca7033526f076846b6a34d6d6b4c963489cc101199d1d7228459548c3">
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div><div class="views-field views-field-nid"><span class="field-content">
|
|||
|
|
|
|||
|
|
<nav>
|
|||
|
|
<ul class="usa-sidenav usa-accordion ">
|
|||
|
|
<li class="usa-sidenav__item usa-sidenav__item--parent">
|
|||
|
|
<a href="/nvlap/about-nvlap" data-drupal-link-system-path="">About NVLAP</a>
|
|||
|
|
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nvlap-1"><span class="usa-sr-only">Expand or Collapse</span></button>
|
|||
|
|
<ul id="menu-nvlap-1" class="usa-sidenav__sublist usa-accordion">
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="/nvlap/about-nvlap/history" data-drupal-link-system-path="">History</a>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="/nvlap/about-nvlap/international-recognition" data-drupal-link-system-path="">International Recognition</a>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="https://www.nist.gov/nvlap/impartiality" title="Impartiality" data-drupal-link-system-path="">Impartiality</a>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="https://www.nist.gov/nvlap/complaints" title="Complaints" data-drupal-link-system-path="">Complaints</a>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="https://www.nist.gov/nvlap/nvlap-staff" title="NVLAP Staff " data-drupal-link-system-path="">NVLAP Staff</a>
|
|||
|
|
</li>
|
|||
|
|
</ul>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="https://www-s.nist.gov/niws/index.cfm?event=directory.search#no-back" data-drupal-link-system-path="">Directory of Accredited Laboratories</a>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="https://www-s.nist.gov/niws/index.cfm?event=productlist.search#no-back" data-drupal-link-system-path="">Search Test Methods or Calibration Parameters</a>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="/nvlap/accreditation-programs" data-drupal-link-system-path="">Accreditation Programs</a>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-sidenav__item usa-sidenav__item--parent">
|
|||
|
|
<a href="/nvlap/assessor-resources" data-drupal-link-system-path="">Assessor Resources</a>
|
|||
|
|
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nvlap-5"><span class="usa-sr-only">Expand or Collapse</span></button>
|
|||
|
|
<ul id="menu-nvlap-5" class="usa-sidenav__sublist usa-accordion">
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="/nvlap/assessor-resources/assessment-forms" data-drupal-link-system-path="">Assessment Forms</a>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="/nvlap/assessor-resources/nvlap-assessor-bulletins" data-drupal-link-system-path="">NVLAP Assessor Bulletins</a>
|
|||
|
|
</li>
|
|||
|
|
</ul>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="/nvlap/publications-and-forms" data-drupal-link-system-path="">Publications and Forms</a>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-sidenav__item usa-sidenav__item--parent">
|
|||
|
|
<a href="/nvlap/apply-nvlap-accreditation" data-drupal-link-system-path="">Apply for NVLAP Accreditation</a>
|
|||
|
|
<button class="usa-accordion__button" aria-expanded="false" aria-controls="menu-nvlap-7"><span class="usa-sr-only">Expand or Collapse</span></button>
|
|||
|
|
<ul id="menu-nvlap-7" class="usa-sidenav__sublist usa-accordion">
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="https://www.nist.gov/nvlap/nvlap-fee-structure" data-drupal-link-system-path="">NVLAP Fee Structure</a>
|
|||
|
|
</li>
|
|||
|
|
</ul>
|
|||
|
|
</li>
|
|||
|
|
<li class="usa-sidenav__item">
|
|||
|
|
<a href="/nvlap/referencing-nvlap-accreditation-and-use-ilac-combined-mark" data-drupal-link-system-path="">Referencing NVLAP Accreditation and Use of ILAC Combined Mark</a>
|
|||
|
|
</li>
|
|||
|
|
</ul>
|
|||
|
|
</nav>
|
|||
|
|
|
|||
|
|
</span></div></div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
<!-- nist-index-ignore-end -->
|
|||
|
|
<!-- nist-index-ignore-start -->
|
|||
|
|
<!-- nist-index-ignore-end -->
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
</aside>
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div
|
|||
|
|
class="nist-page__region nist-page__region--content tablet-lg:grid-col-8 desktop-lg:grid-col-9"
|
|||
|
|
>
|
|||
|
|
|
|||
|
|
<div
|
|||
|
|
class="nist-block"
|
|||
|
|
>
|
|||
|
|
|
|||
|
|
|
|||
|
|
<h1 class="nist-page__title">Asbestos Fiber Analysis LAP</h1>
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
<div
|
|||
|
|
class="nist-block"
|
|||
|
|
>
|
|||
|
|
|
|||
|
|
|
|||
|
|
<!-- nist-index-ignore-start -->
|
|||
|
|
<div data-elastic-exclude class="nist-block nist-social__wrapper">
|
|||
|
|
<h2 class="nist-social__title">Share</h2>
|
|||
|
|
<div class="social-media-sharing">
|
|||
|
|
<div class="nist-social__wrapper--share">
|
|||
|
|
<div>
|
|||
|
|
<a target="_blank" rel="noopener" href="https://www.facebook.com/share.php?u=https://www.nist.gov/nvlap/asbestos-fiber-analysis-lap"
|
|||
|
|
title="Facebook" class="nist-social nist-social--facebook-gray">
|
|||
|
|
<span>Facebook</span>
|
|||
|
|
</a>
|
|||
|
|
</div>
|
|||
|
|
<div>
|
|||
|
|
<a target="_blank" rel="noopener" href="https://www.linkedin.com/shareArticle?mini=true&url=https://www.nist.gov/nvlap/asbestos-fiber-analysis-lap&source=https://www.nist.gov/nvlap/asbestos-fiber-analysis-lap"
|
|||
|
|
title="Linkedin" class="nist-social nist-social--linkedin-gray">
|
|||
|
|
<span>Linkedin</span>
|
|||
|
|
</a>
|
|||
|
|
</div>
|
|||
|
|
<div>
|
|||
|
|
<a target="_blank" rel="noopener" href="https://x.com/intent/tweet?url=https://www.nist.gov/nvlap/asbestos-fiber-analysis-lap&status=https://www.nist.gov/nvlap/asbestos-fiber-analysis-lap"
|
|||
|
|
title="X.com" class="nist-social nist-social--x-gray">
|
|||
|
|
<span>X.com</span>
|
|||
|
|
</a>
|
|||
|
|
</div>
|
|||
|
|
<div>
|
|||
|
|
<a href="mailto:?subject=NIST.gov&body=Check out this site https://www.nist.gov/nvlap/asbestos-fiber-analysis-lap"
|
|||
|
|
title="Email" class="nist-social nist-social--envelope-gray">
|
|||
|
|
<span>Email</span>
|
|||
|
|
</a>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<!-- nist-index-ignore-end -->
|
|||
|
|
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
<div
|
|||
|
|
class="nist-block"
|
|||
|
|
>
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div class="text-with-summary">
|
|||
|
|
|
|||
|
|
|
|||
|
|
<div class="margin-left-4 margin-bottom-2 align-right">
|
|||
|
|
<figure class="nist-image">
|
|||
|
|
|
|||
|
|
<img loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2017/05/10/1866_crocidolite_from_alsf.jpg?itok=-_yx5rFs" width="480" height="319" alt="Asbestos" typeof="foaf:Image" />
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<figcaption class="nist-image__caption">
|
|||
|
|
<div data-caption-editable="true" class="nist-image__caption-content">
|
|||
|
|
|
|||
|
|
<p>The image shows a 1866 Standard Heated Crocidolite to 498 degrees C between 1866 Standard Amosite in 1.68 Crossed Polars with Red Plate 530 nm (z). </p>
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
<div class="nist-image__credit">
|
|||
|
|
<span class="nist-image__credit-label">Credit:</span>
|
|||
|
|
|
|||
|
|
ALSF
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
</figcaption>
|
|||
|
|
</figure>
|
|||
|
|
|
|||
|
|
</div>
|
|||
|
|
|
|||
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<p>The NVLAP Asbestos Fiber Analysis program provides assurance that laboratories are competent to analyze asbestos samples using polarized light microscopy (PLM) and/or transmission electron microscopy (TEM). The Asbestos Hazard Emergency Response Act (AHERA), enacted in 1986, requires that laboratories that analyze asbestos samples taken from public, or private, elementary or secondary schools, to be accredited by the National Institute of Standards and Technology (NIST) National Voluntary Laboratory Accreditation Program (NVLAP).</p><p> </p><h3>Requirements Documents</h3><p><strong>Overall Program: </strong></p><ul><li><a href="https://doi.org/10.6028/NIST.HB.150-2020-upd1">NIST Handbook 150:2020, update 1, NVLAP Procedures and General Requirements</a></li><li><a class="media-link-ga " data-entity-substitution="canonical" data-entity-type="media" data-entity-uuid="c377abe5-8472-4d58-85ca-f639e206ddd4" data-file-url="/system/files/documents/2021/10/05/LB-140-2021%20Update%20to%20NVLAP%20logo%20on%20Dosimetry-Asbestos%20scopes%20and%20certifcates.pdf" href="/document/lab-bulletin-lb-140-2021-update-nvlap-accreditation-documents-dosimetry-and-asbestos" title="Lab Bulletin LB-140-2021: Update to NVLAP accreditation documents for Dosimetry and Asbestos laboratories">Lab Bulletin LB-140-2021: Update to NVLAP accreditation documents for Dosimetry and Asbestos laboratories</a></li></ul><p><strong>Bulk (PLM):</strong></p><ul><li><a href="https://www.nist.gov/document/nist-hb-150-3-2006-1pdf" data-entity-type="node" data-entity-uuid="7541279c-206c-471c-9c44-48f4ad4660e2" data-entity-substitution="canonical">NIST Handbook 150-3:2006, NVLAP Bulk Asbestos Analysis</a><br> </li><li><a class="media-link-ga " data-entity-substitution="canonical" data-entity-type="media" data-entity-uuid="843ef789-069c-46ec-a9f4-7ced9664162f" data-file-url="/system/files/documents/2020/03/03/LB-118-2020%20Update%20to%20NVLAP%20logo%20on%20scopes%20and%20certifcates.pdf" href="/document/lb-118-2020" title="LB-118-2020">NVLAP Lab Bulletin LB-118-2020</a></li><li><a href="https://www.nist.gov/document/lb-93-2016-asbestos-v2pdf" data-entity-type="node" data-entity-uuid="6b251b46-8fbe-4bbb-af54-2c6fbc184f65" data-entity-substitution="canonical">NVLAP Lab Bulletin LB-93-2016</a></li><li><a href="https://www.nist.gov/document/lb682012pdf" data-entity-type="node" data-entity-uuid="f3a2a652-4d66-4462-8d59-e8898ed6d1da" data-entity-substitution="canonical">NVLAP Lab Bulletin LB-68-2012</a></li></ul><p><strong>Airborne (TEM):</strong></p><ul><li><a href="https://www.nist.gov/document/nist-hb-150-13-2006-1pdf" data-entity-type="node" data-entity-uuid="2705460a-1f60-4ed9-87c0-74e68bd59e1f" data-entity-substitution="canonical">NIST Handbook 150-13:2006, NVLAP Airborne Asbestos Analysis</a><br> </li><li><a class="media-link-ga " data-entity-substitution="canonical" data-entity-type="media" data-entity-uuid="843ef789-069c-46ec-a9f4-7ced9664162f" data-file-url="/system/files/documents/2020/03/03/LB-118-2020%20Update%20to%20NVLAP%20logo%20on%20scopes%20and%20certifcates.pdf" href="/document/lb-118-2020" title="LB-118-2020">NVLAP Lab Bulletin LB-118-2020</a></li><li><a href="https://www.nist.gov/document/lb692012pdf" data-entity-type="node" data-entity-uuid="db84dd16-6d6a-45d5-931f-092e220f6fc9" data-entity-substitution="canonical">NVLAP Lab Bulletin LB-69-2012</a></li></ul><p> </p><h3><span><strong>Proficiency Testing Requirements</strong></span></h3><p class="MsoNormal"><span>The Asbestos Fiber Analysis LAP requires laboratory participation in a NVLAP-mandated proficiency testing program provided by RTI International (RTI), </span><a href="https://www.rti.org/service-capability/proficiency-testing-and-reference-materials"><span>https://www.rti.org/service-capability/proficiency-testing-and-reference-materials</span></a><span>. The requirements for laboratory participation in NVLAP-mandated proficiency testing are given in NIST Handbooks 150-3 and 150-13. Proficiency testing is conducted biannually (twice a year) for PLM a
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</html>
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