Gravimetric & Basic Chemical Assays

Gravimetric and basic chemical assays are classical analytical methods that determine material composition through precise mass-based measurements, including controlled drying, ignition, precipitation, filtration, and residue analysis. Complementary qualitative and quantitative assays are used to identify key ions, functional groups, and chemical reactivity, providing direct and highly reliable measurements of material constituents.

At Materials Metric, gravimetric and classical chemical assays deliver robust, traceable data essential for verifying chemical composition, purity, moisture content, ash levels, insoluble fractions, and batch consistency. These methods support formulation development, quality control, impurity assessment, and regulatory documentation across pharmaceuticals, biomaterials, polymers, chemicals, and industrial products.

Uses of Gravimetric & Classical Chemical Assays

• Quantify moisture, volatile content, or ash/residue
• Identify metal ions, salts, precipitates, or inorganic content
• Assess solubility, reactivity, and chemical identity
• Confirm raw material purity
• Detect contamination or formulation inconsistencies
• Support early-stage R&D and failure analysis

Applications

Polymers, adhesives, coatings, and composites
Pharmaceutical APIs and excipients
Ceramics, catalysts, and inorganic powders
Consumer and industrial chemicals
Food and agricultural products
Environmental and residue testing

Sample Analysis Process

1. Objective Definition

Identify property or analyte of interest
Select appropriate gravimetric or classical chemical method

2. Sample Preparation

Controlled drying, heating, or ignition
Dissolution or precipitation if required
Filtration or isolation of analyte

3. Gravimetric or Chemical Testing

Moisture / volatile determination
Ash or inorganic residue quantification
Precipitation-based analyte isolation and weighing
Functional group and ion-identification assays
Solubility and reactivity analysis

4. Reporting

Quantitative mass results (% or mg/g)
Qualitative identification outcomes
Interpretation linked to purity, contamination, or performance

Why Choose Materials Metric

Materials Metric provides high-precision gravimetric and classical chemical assays delivered through controlled workflows and deep analytical chemistry expertise.

We offer:
• Highly accurate mass-based methods for purity, residue, and composition
• Classical assays for ion detection, functional groups, and qualitative screening
• Expertise with polymers, ceramics, biomaterials, pharmaceuticals, and industrial materials
• Regulatory-aligned documentation suitable for QC audits and FDA/ISO submissions
• Multi-technique integration with ICP, chromatography, FTIR, titration, and stability studies

Our analyses deliver objective, defensible data essential for verifying chemical identity, confirming formulation performance, and ensuring product quality.

Related services

To learn more about our Gravimetric & Basic Chemical Assays or other testing needs, please contact us.

Frequently Asked Questions

What is gravimetric and basic chemical assay analysis?

Gravimetric analysis determines the amount of a constituent by isolating it and measuring its mass, for example by precipitation, filtration, drying, or ignition. Basic chemical assays combine such mass-based measurements with simple chemical determinations to quantify composition. Materials Metric uses these classical methods to measure content that is directly traceable to a calibrated balance.

What can gravimetric and basic assays measure?

They measure moisture, loss on drying, ash and residue on ignition, filler and inorganic content, total solids, and specific precipitable species such as sulfate or silica. Because the result rests on a mass measurement, gravimetry is often used as a reference or arbitration method. It is well suited to major constituents where high accuracy is required.

What sample is required for gravimetric assays?

A representative sample of several grams to tens of grams is typical, as larger masses improve precision and reduce the effect of weighing uncertainty. Solids, powders, liquids, and slurries are acceptable provided the target constituent can be isolated cleanly. Telling us the approximate expected content helps us scale the sample and procedure.

Which standards apply to gravimetric assays?

Analyses follow validated or fit-for-purpose methods aligned with ASTM, ISO, and USP where applicable, including recognized procedures for loss on drying, residue on ignition, and ash content. The method chosen depends on the constituent and matrix. Where no compendial procedure fits, Materials Metric uses a documented fit-for-purpose gravimetric method.