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Micro / NanoElectronics

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High-purity precursors and the process chemicals a fabrication line consumes. The specification here is written almost entirely in what must be absent: metals at parts per billion or lower, particles counted per millilitre above a stated size, and a container that does not leach into its own contents.

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In this range

Listed on the TSS storefront and searchable there by name or CAS number. Every enquiry is contracted and invoiced by Taitil Global Inc. in the United States or Europe.

Specifying it

What decides the purchase

The compound is usually fixed by the route. These are the things that vary between suppliers and between lots.

  1. Trace metals at ppb, reported by ICP-MS

    A semiconductor-grade chemical is defined by its metallic impurity profile, not its assay. Sodium, potassium, iron, copper and the rest are limited individually at parts per billion or below, and the certificate should report them by ICP-MS rather than summarising them as a single figure. An AR grade with an excellent assay can be several orders of magnitude away on metals.

  2. SEMI grades are a ladder, and they are not interchangeable

    SEMI C standards define successive purity tiers, and a process qualified on one tier is not automatically safe on another. Moving down a tier to save cost changes the metal budget of the whole process. State the SEMI grade the process requires rather than a general purity description.

  3. Particle count is a separate specification from purity

    A chemical can be metallically clean and still carry particles that cause defects on a wafer. Particle counts are specified per millilitre above a stated size — 0.2 µm and 0.5 µm are common thresholds — and reported by liquid particle counter. If defect density matters, this belongs on the enquiry independently of the metals specification.

  4. The container is part of the purity specification

    Glass leaches sodium and boron; ordinary plastics leach plasticisers and extractables. High-purity chemicals ship in specific fluoropolymer or specially prepared HDPE for this reason, and decanting into an unqualified vessel discards the specification you paid for. Packaging and any dispensing arrangement should be agreed at enquiry.

Questions

What is the difference between AR grade and semiconductor grade?
They are specified on different things. AR grade limits named chemical impurities and reports a high assay. Semiconductor grade limits individual metals at parts per billion, controls particle count, and ships in packaging chosen so the container does not contaminate the contents. An AR chemical can be chemically purer in the conventional sense and still be unusable in a fab.
Why does packaging matter so much at this purity?
Because at parts-per-billion the container is a significant source. Glass releases sodium and boron into aqueous solutions over time; many plastics release extractables. That is why high-purity material ships in fluoropolymer or specially prepared HDPE, and why decanting into ordinary labware immediately loses the specification. The packaging is not a convenience — it is part of what maintains the grade.
Do I need a certificate for every lot?
For process-critical chemicals, generally yes — the metal and particle data are lot-specific and a generic product specification does not establish that a particular drum meets it. Ask for lot-level certificates as standard rather than on request, and confirm the certificate reports the individual metals rather than a summed total.