Guar Gum Quality Control — In-House Lab & COA Discipline
Brookfield BV1.04B/BV103B viscosity, Fann 35SA rheology, sieve analysis, Kjeldahl protein, aflatoxin and microbial testing on every batch. ISO 9001:2015 audited. COA + 24-month retain sample on every shipment.
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How does B D Guar control Guar Gum quality?
B D Guar runs an ISO 9001:2015 quality system at the Kalol facility: inbound split inspection, in-process Brookfield BV1.04B/BV103B viscosity checks, oilfield Fann 35SA rheology, sieve mesh analysis, halogen-balance moisture, Kjeldahl protein, muffle-furnace ash, gravimetric AIR, plus Salmonella, E. coli and aflatoxin testing on food-grade lots. Every shipment carries a Certificate of Analysis, and a 24-month retain sample is held for lot-level traceability.
Test methods on every batch
| Parameter | Method / Instrument |
|---|---|
| Viscosity (food / industrial) | Brookfield BV1.04B / BV103B, 1%, 25°C |
| Viscosity (oilfield) | Fann Model 35SA, 6 ppt loading |
| Mesh distribution | RoTap sieve analysis (100/200/300) |
| Moisture | Halogen moisture analyzer |
| Protein | Kjeldahl (N × 6.25) |
| Ash | Muffle furnace, 550°C |
| AIR | Gravimetric acid digestion |
| Microbial (food) | Salmonella, E. coli, TPC, yeast/mould |
| Aflatoxin (food) | HPLC, <5 ppb total |
In-house lab
Every batch tested before release — not outsourced.
COA per shipment
Letterhead or private-label format, customer language on request.
24-month retain
Sample library for downstream traceability and disputes.
Related quality resources
2026 Viscosity Testing & QC Update
Viscosity Testing — Quick Answer
How is guar gum viscosity tested?
Guar gum viscosity is measured on a 1% aqueous solution using a Brookfield viscometer (typically LV/RV spindle) at 25°C, after a standardized hydration period, with results reported in centipoise (cps). Buyer and supplier must agree on spindle number, rotation speed (rpm) and hydration time so specification values are directly comparable. B D Guar (ISO 9001:2015, since 1983) issues a Certificate of Analysis (COA) with every lot.
How is guar gum viscosity measured?
Viscosity is developed on a 1% w/w aqueous solution stirred to full dispersion, then read on a Brookfield viscometer at 25°C after a standardized hydration window — buyers commonly specify 2 hours, with 20-minute and 1-hour protocols also in use. Results are reported in centipoise (cps); for comparable numbers, the spindle type, rpm and hydration time must be agreed in advance. Food and industrial HICOL grades (HICOL-3500, HICOL-4000, HICOL-4500, HICOL-5000, HICOL-5500) are qualified this way, while fast-hydrating HICOL-FH oil-drilling grade is read on a Fann Model 35SA at the 3-minute mark for hydraulic-fracturing service qualification. See full specifications.
What quality parameters are on a guar gum COA?
Every COA reports galactomannan / gum content (≥80%), moisture (≤12%), protein (≤5%), ash (≤1.5%), acid-insoluble residue (≤3%), pH of the 1% solution (5.5–7.0), particle size / mesh (100–400 mesh, with 200–300 mesh standard), viscosity in cps, and microbiological limits. Custom limits are available via custom guar gum manufacturing.
What microbiological tests are run on food-grade guar gum?
Food-grade lots are screened for standard plate count, yeast & mould, coliforms, E. coli, Salmonella, Staphylococcus and Pseudomonas. Detailed limits are covered in our microbiological standards article.
How does mesh size affect performance?
Finer mesh (200–300) hydrates faster and is preferred where quick viscosity build-up matters, while coarser 100 mesh develops viscosity more slowly and reduces lumping in dry blends. Mesh is selected per application together with viscosity grade.
How is purity and consistency verified?
Beyond routine wet chemistry, advanced analytical methods such as HPLC are used to confirm purity and batch-to-batch consistency. Under our ISO 9001:2015 quality system every lot ships with a COA, backed by our controlled manufacturing process and 12,000 MT/year capacity serving 50+ countries.
Is B D Guar's guar gum EU 2026/196 / ETO-free compliant?
QC includes ethylene-oxide (ETO) controls ahead of EU Regulation 2026/196, which applies from 18 August 2026. See our dedicated EU 2026/196 compliant guar gum page for scope and documentation.
Last updated: 2026-07-11
Frequently asked questions
How do you control Guar Gum quality?
B D Guar runs an in-house ISO 9001:2015 quality system covering inbound split inspection, in-process viscosity checks (Brookfield BV1.04B / BV103B), oilfield Fann 35SA rheology, mesh distribution by sieve analysis, moisture by halogen balance, protein by Kjeldahl, ash by muffle furnace, AIR by gravimetric acid digestion, and microbial / aflatoxin testing per food-export regulations.
What test methods do you use for viscosity?
Food and industrial Guar Gum is tested on Brookfield BV1.04B and BV103B viscometers at 1% solution, 25°C, after 2-hour hydration. Oilfield fast-hydrating grade uses Fann Model 35SA rheology at 6 ppt loading for 28–34 cP target — the standard for hydraulic-fracturing service-company qualification.
Is a COA included with every shipment?
Yes. Every batch ships with a Certificate of Analysis covering viscosity, mesh, moisture, protein, ash, AIR, pH, Salmonella, E. coli, total plate count, yeast / mould and aflatoxin (food grade) — on B D Guar letterhead or your private-label format.
Do you retain samples for traceability?
Yes. Every production batch generates a retain sample held for 24 months (food grade) or 36 months (oilfield) under controlled humidity and temperature. Retain samples enable lot-level investigation if a downstream issue arises.
Which certifications back the quality system?
ISO 9001:2015 quality management, ISO 22000 food safety, FSSAI license, HALAL (JAKIM-recognized), Kosher (OU), Organic (NPOP / USDA / EU), FDA 21 CFR 184.1339 GRAS compliance, and EU E412 conformity. Audit reports available under NDA.
Do you do third-party testing?
Yes. Pre-shipment SGS, Bureau Veritas, Cotecna or Intertek third-party inspection available at customer cost — common for first-time buyers and tier-1 oilfield service companies. We also accept customer-appointed auditors at the Kalol facility with 14 days' notice.
What happens if a batch fails spec?
Out-of-spec batches are quarantined, root-cause analyzed (raw split, process or QC instrument), reworked or downgraded, and never shipped against the original spec. Customers receive replacement on the next production slot with a non-conformance report and CAPA documentation.
At what temperature and concentration is guar gum viscosity measured?
Standard practice is a 1% by weight aqueous solution measured with a Brookfield viscometer at 25°C after a standardized hydration period, reported in centipoise (cps). The spindle number, rotation speed and hydration time must be agreed between buyer and supplier so results are directly comparable.
What is included in a B D Guar Certificate of Analysis (COA)?
Each COA reports galactomannan content, moisture, protein, ash, acid-insoluble residue, pH (1% solution), particle size/mesh, viscosity in cps, and microbiological results, issued under our ISO 9001:2015 quality system for every lot.