BHT
BHT, also known as Butylated Hydroxytoluene or E321, is a food-grade antioxidant used by industrial food manufacturers for oxidation control in fats, oils, flavour systems, colour systems, vitamin preparations and fat-containing finished products where permitted. It is especially relevant in formulations where lipid oxidation can cause rancidity, stale flavour, colour fading, vitamin loss, reduced shelf life or reduced sensory quality.
This page is prepared as a technical sourcing reference for purchasing teams, R&D technologists, QA departments, regulatory teams and import managers who need to compare BHT assay, physical form, solubility behaviour, application fit, documentation, packaging and supplier suitability before quotation or approval.
Product identity
| Product | BHT |
|---|---|
| Common names | Butylated hydroxytoluene, 2,6-di-tert-butyl-4-methylphenol, dibutylhydroxytoluene, antioxidant 264 |
| Category | Antioxidants & Oxidation Control |
| Function | Antioxidant / oxidation-control ingredient / lipid-stability support / flavour and colour protection ingredient |
| E / INS number | E321 |
| CAS / identity | 128-37-0 |
| Chemical class | Hindered phenolic antioxidant |
| Application phase | Primarily fat, oil and lipid-containing systems; not normally selected as a water-soluble antioxidant |
| Typical form | White to off-white crystalline powder, flakes, oil-dispersible grade, liquid dilution or antioxidant blend |
| Typical grade focus | Food grade, oil grade, flavour grade, fat-protection grade, antioxidant blend grade or destination-market compliant grade |
Application fit
BHT is evaluated where oxidation of fats, oils or lipid-soluble ingredients can reduce shelf life, sensory quality or nutritional value. Suitability depends on product category, legal permission, oil phase, processing temperature, oxygen exposure, packaging, metal contamination, light exposure and label strategy.
- Edible oils, seasoning oils and fat-based ingredient systems where permitted
- Snack foods, fried products, chips, extruded snacks and seasoning coatings
- Meat systems, poultry systems and processed foods containing fat phases
- Bakery fats, shortenings, margarines, fillings and cream systems
- Flavour oils, oleoresins, spice extracts and aroma concentrates
- Colour systems, carotenoid preparations and fat-soluble colour blends
- Vitamin preparations and nutrient systems sensitive to oxidation
- Beverage emulsions or cloud systems containing oil phases after validation
Technical function in food systems
BHT is used to slow lipid oxidation by interrupting free-radical chain reactions that occur when unsaturated fats and oils react with oxygen. In practical food manufacturing, oxidation may appear as rancid odour, cardboard notes, stale flavour, colour loss, vitamin degradation, surface discoloration or reduced product acceptability. BHT is selected where a permitted synthetic antioxidant can support shelf-life protection in the lipid phase.
Because BHT is lipophilic, it should normally be dissolved or uniformly dispersed into the fat or oil phase before distribution into the finished product. Direct addition into an aqueous system can lead to poor dispersion and inconsistent antioxidant performance. Industrial trials should evaluate the point of addition, oil temperature, mixing time, compatibility with other antioxidants and final product stability under realistic storage conditions.
Key functional properties
- Lipid oxidation control: Helps delay rancidity and flavour deterioration in oils and fat-containing foods.
- Flavour protection: Supports stability of flavour oils, spices, oleoresins and aroma concentrates sensitive to oxidation.
- Colour protection: Can help protect oxidation-sensitive colour systems when the colour is carried in a lipid phase.
- Vitamin protection: May support stability of selected fat-soluble vitamins and nutrient preparations where compatible.
- Low-dose functionality: Often used at relatively low inclusion levels within legal limits, requiring accurate dosing.
- Blend compatibility: Can be evaluated with BHA, TBHQ, propyl gallate, tocopherols, ascorbyl palmitate or chelating systems where permitted.
- Processing support: Helps manage oxidation risk during storage of fats, intermediate ingredients and finished products.
Process variables to control
- Oil or fat type, degree of unsaturation and peroxide value
- Initial quality of raw oil, fat, flavour or colour system
- Point of addition and dissolution temperature in the fat phase
- Oxygen exposure during mixing, filling, storage and distribution
- Heat exposure during frying, baking, spray drying or hot processing
- Light exposure and packaging barrier performance
- Metal ions, salts, spices, minerals and pro-oxidant contaminants
- Use with synergists, chelators or mixed antioxidant systems where permitted
Industrial formulation guidance
For industrial purchasing and R&D work, BHT should be evaluated by assay, purity, form, dispersion behavior and regulatory fit. A crystalline powder may be suitable for oil dissolution in a controlled premix tank, while a liquid antioxidant dilution may be easier for continuous dosing into oils, flavour systems or fat blends. Some buyers may require BHT alone, while others may need antioxidant blends designed for specific oxidation challenges.
Recommended use evaluation
- Define the target oxidation problem: rancidity, stale flavour, colour loss, vitamin degradation or oil instability.
- Confirm legal permission and maximum use level for the exact product category and destination market.
- Check whether the formulation needs BHT alone or a blend with synergistic antioxidants.
- Dissolve or disperse BHT into the correct fat or oil phase before final mixing.
- Evaluate antioxidant performance in the real product matrix, not only in a model oil system.
- Measure peroxide value, anisidine value, hexanal, sensory rancidity or other relevant oxidation markers.
- Validate shelf life under expected heat, light, oxygen and distribution conditions.
Common processing risks
- Poor dispersion: Addition into the wrong phase can create uneven antioxidant distribution and weak protection.
- Late addition: Adding BHT after oxidation has already advanced cannot fully reverse rancidity.
- Overheating: Excessive process temperature may reduce antioxidant effectiveness or increase volatility risk depending on conditions.
- Regulatory mismatch: Use levels and food-category permissions vary by destination market and customer policy.
- Label concerns: Some customers restrict synthetic antioxidants or require alternative antioxidant systems.
- Pro-oxidant environment: Metals, light, oxygen and poor packaging can overwhelm antioxidant protection.
- Supplier switching: Differences in assay, particle form or blend carrier can affect dosing and application results.
Application-specific value
BHT is used across categories where fat or oil stability is commercially important. It may be compared with BHA, TBHQ, propyl gallate, octyl gallate, tocopherols, rosemary extract, ascorbyl palmitate, citric acid, EDTA or custom antioxidant systems. The best choice depends on legal permission, oil type, product format, processing temperature, desired label, cost-in-use and required shelf-life protection.
Edible oils and fat systems
- Supports oxidation control in oils, fats, shortenings and seasoning oils where legally permitted.
- Useful for intermediate fat systems that face storage before use in finished products.
- Should be dissolved uniformly into the oil phase using controlled mixing and temperature.
- Testing should monitor peroxide value, anisidine value, sensory rancidity and shelf-life behaviour.
Snacks and fried products
- Can help protect lipid-containing snacks from stale flavour and oxidation during storage.
- May be applied through seasoning oil, frying oil, fat coating or flavour carrier where permitted.
- Requires testing under real packaging conditions because oxygen and light exposure strongly affect snack stability.
- Finished products should be evaluated for rancidity, aroma loss, colour change and consumer sensory acceptance.
Meat and prepared food systems
- Can be evaluated in fat-containing meat, poultry and prepared food systems where permitted.
- May support protection against warmed-over flavour and lipid-related quality loss in selected applications.
- Compatibility with salt, curing systems, spices, phosphates, packaging atmosphere and heat treatment should be checked.
- Finished products should be evaluated for flavour stability, colour stability, purge and storage odour.
Flavours, colours and vitamins
- Supports stability of oxidation-sensitive flavour oils, essential oils, oleoresins and aroma systems.
- Can help protect selected fat-soluble colour systems and vitamin preparations where compatible.
- Requires careful evaluation because antioxidant selection may affect label, solubility, taste and regulatory status.
- Premixes should be checked for assay, uniformity, carrier compatibility and storage stability.
Typical specification points to review
For industrial purchasing, the most useful comparison is not only price per kilogram. BHT grades may differ in assay, purity, melting range, appearance, odour, particle size, packaging, regulatory documentation and suitability for food-contact or food-additive use. Buyers should request the supplier’s actual specification and certificate of analysis before approval.
Technical parameters
| Assay | Key purchasing parameter; confirm purity and test method from supplier documentation. |
|---|---|
| Identification | Confirm BHT identity, E321 reference and CAS 128-37-0 alignment with specification. |
| Appearance | Typically white to off-white crystalline powder, flakes or other supplier-defined physical form. |
| Melting range | Useful identity and purity indicator; confirm supplier method and specification range. |
| Odour | Important for flavour systems and delicate fat-containing foods. |
| Colour | Relevant for light-coloured fats, oils, flavours and vitamin preparations. |
| Loss on drying / moisture | Important for storage stability, flowability and quality comparison. |
| Residue on ignition / ash | Useful purity parameter for comparing food-grade lots. |
| Related substances | Review according to food-grade, pharmacopeial or customer-specific requirements where applicable. |
| Solubility / dispersibility | Important for oil premixes, liquid antioxidant blends and dosing systems. |
| Particle size | Affects dusting, dissolution speed, blending and dosing accuracy. |
| Heavy metals | Should comply with food-grade and destination-market limits. |
| Microbiology | Generally less critical for pure crystalline antioxidants than for nutritive ingredients, but may be requested by buyer policy. |
Commercial parameters
| Packaging | Commonly supplied in bags, cartons, drums, fibre drums, pails or sealed containers depending on grade and supplier. |
|---|---|
| Net weight | Confirm available pack sizes according to supplier, grade, application and destination logistics. |
| Palletization | Confirm pallet type, wrapping, stack height, carton strength and protection from heat and contamination. |
| Shelf life | Confirm from supplier documents; depends on packaging, storage and quality system. |
| Storage | Store tightly closed in a clean, dry, cool and well-ventilated area away from heat, ignition sources, strong oxidizers and direct sunlight. |
| Handling | Use dust control, accurate weighing, clean utensils and appropriate personal protection according to the safety data sheet. |
| MOQ | Depends on supplier, grade, stock position, documentation package, packaging format and destination logistics. |
| Lead time | Depends on production schedule, quality release, documentation, inspection and freight route. |
| Cost-in-use | Compare assay, effective dosage, antioxidant performance, regulatory fit and shelf-life benefit rather than kilogram price alone. |
Quality, food safety and compliance notes
BHT for food manufacturing should be purchased only with clear food-grade documentation, traceability and regulatory support. The buyer should verify that the material is suitable for the intended food category, destination market, use level, customer standard and finished-product label. Where the product is used for export, private label, child-focused foods, special nutrition products or customers with restricted-ingredient lists, regulatory confirmation should be completed before commercial use.
QA team checklist
- Confirm product name, E/INS number, CAS number, chemical identity and food-grade status.
- Check whether the requirement is pure BHT, oil-dispersible BHT, liquid dilution or antioxidant blend.
- Compare supplier specification with internal purchasing and application requirements.
- Review actual batch COA before shipment or release.
- Confirm assay, appearance, melting range, odour, moisture and impurity limits.
- Verify allergen, GMO, halal, kosher, vegan or other buyer-required statements where applicable.
- Review safety data sheet, storage conditions and handling precautions before plant use.
- Check production date, expiry date, batch number, label information and packaging integrity.
- Conduct application trials and oxidative-stability testing before changing supplier, grade or dosage.
Regulatory review points
- Destination-market permission for BHT / E321 in the relevant food category
- Maximum permitted use level, carry-over rules and customer-specific limits where applicable
- Finished-product label declaration as antioxidant, BHT, E321 or local required name
- Restrictions for infant foods, special nutrition, child-focused foods or sensitive categories where relevant
- Use in intermediate ingredients such as flavours, colours, vitamin preparations or packaging-related systems
- Customer standards, retailer restricted lists and synthetic-antioxidant policies
- Import documentation, customs description and local registration requirements
- Finished-product safety, stability, label accuracy and compliance responsibility
Documents to request
A complete BHT inquiry should include both technical and commercial document requirements. This helps reduce delays during supplier qualification, sample approval, customer audits, customs clearance, safety review and first production trials.
Core documents
- Product specification or technical data sheet
- Certificate of analysis for available batch or representative lot
- Safety data sheet
- Food-grade statement or regulatory compliance declaration
- Statement confirming BHT / E321 / CAS 128-37-0 identity where applicable
- Origin statement and manufacturer information where available
- Shelf-life and recommended storage conditions
- Product label, packaging details and pallet configuration
Optional buyer-specific documents
- Halal certificate, kosher certificate or other market-specific certification
- Allergen statement and cross-contamination declaration
- GMO status declaration
- Vegan or vegetarian suitability statement where required
- Heavy metal statement or contaminant declaration
- Residual solvent or impurity statement where applicable
- Microbiological statement where required by customer policy
- Pharmacopeial or FCC-related compliance statement where requested
- Country-specific import, customs or registration documents
How to request this product
Send the product name, target specification, assay requirement, application, quantity, destination country, packaging preference, delivery term, expected shipment date and required documents. If you already purchase BHT, attach or describe your existing specification, label, certificate of analysis, antioxidant system, use level, oil type or shelf-life target so supplier options can be compared more accurately.
Information that improves quotation accuracy
- Target application and finished-product type
- Required identity: BHT, E321, butylated hydroxytoluene or CAS 128-37-0
- Required form: crystalline powder, flakes, liquid dilution, oil-dispersible grade or antioxidant blend
- Required assay, purity or reference specification
- Oil or fat type, flavour system, colour system, vitamin preparation or product matrix
- Target oxidation challenge and desired shelf-life improvement
- Current antioxidant system, dosage or reference COA
- Required annual volume and first-order quantity
- Preferred packaging size and pallet requirement
- Destination port, warehouse or delivery city
- Required Incoterms such as EXW, FOB, CFR, CIF or DAP
- Required certificates and destination-market declarations
- Sample quantity and expected approval timeline
Supplier comparison criteria
- Food-grade documentation completeness
- Assay consistency and impurity control
- Regulatory fit for the target destination market and food category
- Application performance in the buyer’s real fat or oil system
- Compatibility with other antioxidants, synergists and packaging strategy
- Storage stability, odour neutrality and handling performance
- Packaging strength, moisture protection and contamination control
- Batch traceability and shelf-life remaining at shipment
- Export experience and document responsiveness
- Total landed cost and oxidation-control cost-in-use
Useful answers
What is BHT used for in food manufacturing?
BHT E321 is used as an antioxidant and oxidation-control ingredient to help protect fats, oils, flavours, colours, vitamins and fat-containing finished products from oxidative deterioration, rancidity, stale flavour, colour change and shelf-life loss where permitted.
What does BHT mean?
BHT stands for butylated hydroxytoluene. It is also known chemically as 2,6-di-tert-butyl-4-methylphenol and is commonly referenced by CAS number 128-37-0.
Is BHT water soluble?
BHT is normally selected for fat and oil systems rather than water-based systems. For effective performance, it should usually be dissolved or dispersed into the oil or fat phase before being incorporated into the final product.
Can BHT be blended with other antioxidants?
Yes, BHT may be evaluated with other antioxidants or synergists such as BHA, TBHQ, gallates, tocopherols, ascorbyl palmitate, citric acid or chelating systems where permitted. The correct blend depends on oil type, process, label requirement and local regulation.
Which technical parameters should be checked before purchasing?
Buyers should compare assay, identification, melting range, appearance, odour, colour, moisture or loss on drying, ash or residue, related substances, heavy metals, solubility or dispersibility, particle size, packaging type, shelf life and destination-market compliance.
Can Global Food Additives source BHT?
Global Food Additives can review sourcing options for BHT according to target specification, assay, application, grade form, quantity, destination, packaging preference, delivery term and required documentation.
Which documents should be requested?
Buyers commonly request a technical data sheet, product specification, certificate of analysis, safety data sheet, food-grade statement, origin statement, regulatory compliance declaration, allergen or GMO declaration where required, shelf-life information, label details and packing configuration.
Is this product permitted in every country?
No. Food additive use depends on destination-market rules, food category, use level, label requirements, customer restrictions and buyer responsibility. The buyer should confirm local regulations and customer standards before commercial use.
What should be tested during factory trials?
Factory trials should evaluate dissolution, dosing accuracy, oil-phase distribution, compatibility with other antioxidants, oxidative stability, peroxide value, sensory rancidity, colour retention, vitamin retention, packaging performance, storage stability and finished-product regulatory compliance.
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Send product names, target specifications, quantity, destination country, packaging preference, delivery term, and document requirements. Our team will review your inquiry and respond from [email protected].
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