How to Read a Himalayan Salt Lab Report: A Line-by-Line Guide for Buyers

Published 2026-11-06 · 6 minute read · by Al Goher Trader

Why the Report Matters More Than the Brochure

Every salt supplier says its product is pure. A laboratory report is how a buyer checks that claim without taking it on trust. For food brands, supermarket own-label programmes and anyone selling edible salt into a regulated market, the report is also a working document: your quality team will file it, an auditor may ask to see it, and a retailer may refuse a listing without it. Yet many first-time buyers receive a report, glance at the headline purity figure and file it. This guide explains how to read the whole document so it actually protects you.

Certification and testing are related but different. Halal and Kosher certificates confirm that production meets the requirements of a certifying body; we cover those in our separate guide. A lab report is a measurement of a specific sample at a specific time. Both are useful, and neither replaces the other.

Start With the Header: Who, What and When

Before reading a single result, check the header. It should name the testing laboratory, the client or supplier, the sample description, the date the sample was received and the date of analysis, and a unique report number. Our food-grade lots are analysed by the National Metrology Institute of Pakistan and the National Physical and Standards Laboratory. A report from an independent, named laboratory carries more weight than an in-house sheet, because the lab has no commercial stake in the result.

The sample description is easy to overlook and important. It should identify the product closely enough that you can tell what was tested: for example, the colour grade and grind, such as light pink coarse 2–5 mm or white refined. A report for coarse salt does not automatically describe a powder made from a different seam. Ask the supplier which lot or production batch the sample came from, and whether a current report exists for the specific grade you are buying.

Sodium Chloride: The Headline Figure

The main purity figure on any salt report is sodium chloride, usually expressed as a percentage on a dry basis. Published reports for our food-grade lots show 98–99% sodium chloride. The remainder of a natural rock salt is made up of moisture, small amounts of other naturally occurring minerals such as calcium, magnesium and potassium compounds, traces of iron oxide that give pink salt its colour, and a small fraction of insoluble material.

When comparing suppliers, make sure you are comparing like with like. A figure stated on a dry basis will read slightly higher than one stated as received, because moisture is excluded. Check which basis the report uses and, if two reports use different bases, ask for both figures. Also be wary of any salt marketed with an implausibly high mineral content: a natural rock salt that is mostly sodium chloride is, by definition, mostly salt.

Moisture and Insoluble Matter

Moisture is reported as a percentage and tells you how much water is in the sample. It matters for handling and storage: higher moisture salt clumps more readily and flows less freely through dosing equipment. Because salt absorbs water from humid air, moisture can change between the lab and your warehouse, so treat the figure as a condition at the time of testing.

Insoluble matter is the fraction that does not dissolve in water. In rock salt it typically includes fine mineral particles from the seam. For products that will be dissolved, such as brines, or for clear-liquid applications, a low insoluble figure is preferable, and food manufacturers often set a maximum in their own specification. Screening and grading at the factory, and selection at the seam by colour and clarity, are what keep this figure under control.

Heavy Metals: Read the Units and the Limits

The heavy metals section is the part regulators and auditors look at most closely. It typically lists elements such as lead, cadmium, arsenic and mercury, with a result, a unit and often a detection limit. Results are usually expressed in milligrams per kilogram, which is the same as parts per million. Our independent reports show heavy metals not detectable, meaning any amount present was below what the laboratory method could measure.

Not detectable is only meaningful alongside the method’s detection limit, so check that the report states one. Then compare the results with the limits that apply in your market. The Codex Alimentarius standard for food-grade salt sets international reference limits, and our edible grades are tested as fit for human consumption under CODEX guidelines. Your country or retailer may apply its own limits, which can be stricter. If you are selling into a specific market, share its limits with your supplier before ordering so any extra testing your regulator requires can be arranged.

Microbiology

Salt is a hostile environment for most microbes, but food-safety programmes still expect microbiological testing, particularly for products used in ready-to-eat applications. Reports typically list pathogenic organisms such as Salmonella and E. coli, sometimes alongside total plate count, yeast and mould. Our published reports show zero pathogenic contamination. As with heavy metals, look for the method and the unit, and check results against your own specification.

Matching the Report to Your Shipment

A good report is only useful if it describes the product you actually received. Reports ship with every food-grade order, and the report should correspond to the grade and lot on your packing list. File the report with the commercial invoice, packing list, certificate of origin and phytosanitary certificate for that shipment, so the full document set is together if a customer, auditor or customs officer asks. For recurring orders, keep a running file so you can see that results are consistent over time, which is often more reassuring to an auditor than any single good result.

If you need a test that is not on the standard report, such as a specific contaminant your regulator lists, an allergen statement or a particle size distribution, ask before the order is confirmed. We have cleared customs in more than seventy-five countries and prepare compliant labelling, documentation and any additional testing a destination regulator requires, but it is far easier to arrange before production than after the container has sailed.

Red Flags to Watch For

A few warning signs justify a follow-up question. A report with no laboratory name, no report number or no dates. A report that is many years old being used for current stock. A sample description too vague to tell which product was tested. Results listed without units or detection limits. A report that covers only sodium chloride and nothing else. And any supplier unwilling to send a report before you commit. Samples with lab reports are available to serious buyers before an order, and a supplier confident in its product should be glad to provide them.

Building Results Into Your Own Specification

Experienced buyers do not just read reports; they turn them into a written specification. List the parameters that matter for your product, such as sodium chloride on a stated basis, maximum moisture, maximum insoluble matter, heavy metal limits for your market and microbiological criteria, and agree them with the supplier before the first order. Add grind and colour grade, packaging and labelling requirements. From then on, every report is checked against that specification rather than read in isolation, and any result outside it becomes a clear conversation rather than a judgement call. It also gives your own customers and auditors a simple answer when they ask how you control incoming salt.

Lab Reports for Non-Food Products

Lab reports are essential for edible salt, and relevant for bath salt and for salt sold as raw material to soap and cosmetics manufacturers, who often need to show their own customers what goes into a product. For lamps, candle holders and tiles, the crystal is not consumed, and buyers usually focus instead on weight bands, dimensions, finish and electrical compliance. Animal licks sit in between: feed buyers may ask for composition data, and the same analysis approach applies.