Pyrethrin Oil 50% vs 70%: A Practical Selection Guide for Formulators and Buyers

Pyrethrin Oil is a common commercial term for liquid refined pyrethrum extract supplied for downstream insecticide formulation. In this guide, “Pyrethrin Oil 50%” and “Pyrethrin Oil 70%” refer to commercial concentrates containing approximately 50% or 70% total pyrethrins.

The visible difference between the two grades is straightforward: a 70% concentrate contains more declared pyrethrins per kilogram than a 50% concentrate.

However, concentration alone does not establish that one grade is more suitable, more economical or technically interchangeable with another.

In commercial sourcing, formulators should also review:

• the actual batch assay;
• the assay method and specification range;
• BHT or other antioxidant status;
• carrier or solvent composition;
• physical properties;
• compatibility with the intended formulation;
• packaging and storage requirements;
• cost per kilogram of active pyrethrins.

For purchasing purposes, “50%” or “70%” should therefore be treated as the beginning of specification review—not as the complete identity of the commercial material.

What Do Pyrethrin Oil 50% and 70% Mean?

The declared percentage generally refers to total pyrethrins in the supplied concentrate.

Pyrethrins are not one individual molecule. They are a naturally occurring group of six chemically related insecticidal esters:

• Pyrethrin I;
• Pyrethrin II;
• Cinerin I;
• Cinerin II;
• Jasmolin I;
• Jasmolin II.

FAO/JMPR identifies pyrethrins as six naturally occurring, insecticidally active esters. Its residue definition calculates total pyrethrins as the sum of these six components. NPIC also describes pyrethrins as a mixture of six chemicals naturally present in certain chrysanthemum flowers.

In commercial terms:

• Pyrethrin Oil 50% generally contains approximately 50% total pyrethrins.
• Pyrethrin Oil 70% generally contains approximately 70% total pyrethrins.

The balance of the commercial material may consist of a carrier or solvent system, antioxidants and other formulation-related components. Buyers should confirm the relevant composition declaration, TDS and antioxidant status with the supplier.

Buyers reviewing current concentrations, documents and export packaging can visit our Pyrethrin Oil 50% and 70% product page.

What the Reviewed Supplier COAs Show

The comparison below is based on two actual supplier batch COAs reviewed for this guide.

This comparison shows why two concentrates should not be evaluated only by the headline assay.

The two COAs do not use an identical test scope. The 50% document reports BHT and density. The 70% document reports acetone insolubility but does not list BHT or density.

A missing test item does not demonstrate that the component is absent or that the property is irrelevant. It means the status has not been established by that document.

For example:

The reviewed 70% COA does not list BHT, but this is not sufficient evidence that the product is BHT-free.

The appropriate next step is to request a TDS, composition statement or written antioxidant declaration from the supplier.

A Note About the Reported pH Values

Both reviewed COAs include a pH range even though the products are described as oily liquids.

For a non-aqueous material, the meaning of a pH result depends on how the test sample was prepared. It may involve a defined dilution, an aqueous extract or another specified method.

Neither reviewed COA states:

• the sample-preparation procedure;
• the dilution ratio;
• the extraction medium;
• the referenced analytical method.

The pH values should therefore not be used for direct cross-supplier comparison until the applicable test procedure has been confirmed.

When reviewing specifications, buyers can ask whether the listed value represents:

• pH of a defined aqueous dilution;
• pH of an extract;
• another acidity-related control;
• a field that should instead be expressed as acid value.

This is a good example of why a numerical result without a defined method may have limited purchasing value.

Pyrethrin Oil 50% vs 70%: Practical Comparison

Neither concentration is universally better.

The correct choice depends on the formulation already in use, target active level, carrier system, manufacturing process, shipping conditions and commercial cost structure.

When a 50% Grade May Be Appropriate

A 50% concentrate may be suitable when the buyer’s existing process and formulation have already been developed around that concentration.

Existing Formula Validation

A formulation validated with one 50% grade already includes the carrier introduced by that raw material.

Replacing it with a 70% grade changes more than the quantity of pyrethrins added. It can also alter:

• total carrier content;
• solvent balance;
• surfactant ratio;
• viscosity;
• appearance;
• emulsification;
• storage behavior.

The mathematical active-content adjustment may be simple, but the rest of the formulation still requires review.

Existing Dosing and Dilution Procedures

In some production systems, a 50% concentrate may fit an established dosing or dilution process more conveniently.

This is not a universal property of all 50% products. It depends on:

• the carrier;
• viscosity;
• dosing equipment;
• batch size;
• process sequence;
• operator controls.

The buyer should confirm this through practical formulation and production testing.

Requirement for the Reviewed BHT-Stabilized Specification

The reviewed 50% COA specifies BHT at:

5.0% ± 0.75%

with an actual batch result of:

5.14%

This makes the antioxidant status explicit for that batch and specification.

A buyer considering this grade should still confirm:

• whether the BHT level is acceptable for the destination market;
• whether it is acceptable in the final registered formulation;
• whether the same specification applies to future bulk batches;
• whether the BHT content is included in every commercial COA.

When a 70% Grade May Be Appropriate

A 70% concentrate may be attractive when higher active-content density is commercially useful.

Lower Concentrate Addition

For the same theoretical quantity of pyrethrins:

• 50% concentrate requires approximately 2.00 kg per kilogram of pyrethrins;
• 70% concentrate requires approximately 1.43 kg per kilogram of pyrethrins.

This reduces the amount of concentrate added to the production batch.

Shipping and Storage Efficiency

A higher-concentration grade can reduce:

• shipment weight for a fixed active requirement;
• number of drums;
• warehouse space;
• material-handling volume;
• quantity of carrier transported.

These benefits may be meaningful for larger international orders.

Established Commercial Production

A 70% grade may fit a commercial process that can accurately dose, dilute and incorporate a higher-concentration raw material.

However, the buyer should not assume that the 70% grade can replace a 50% grade only by changing the addition quantity.

The new concentrate should be evaluated for:

• carrier compatibility;
• antioxidant status;
• density;
• mixing behavior;
• finished-product stability;
• manufacturing repeatability.

How Much Concentrate Is Required?

The theoretical quantity of concentrate can be estimated using:

Required Concentrate =
Required Total Pyrethrins ÷ Actual Concentrate Assay

Suppose a production batch requires 5 kg of total pyrethrins.

Using the reviewed 50% batch result of 50.12%:

5 ÷ 0.5012 = approximately 9.98 kg of concentrate

Using the reviewed 70% batch result of 70.12%:

5 ÷ 0.7012 = approximately 7.13 kg of concentrate

The 70% batch therefore requires approximately 2.85 kg less concentrate to provide the same theoretical 5 kg of pyrethrins.

This calculation addresses only active-ingredient quantity. It does not automatically maintain:

• solvent balance;
• carrier level;
• emulsifier ratio;
• synergist ratio;
• total batch weight;
• viscosity;
• finished-product stability.

Those parts of the formulation must be recalculated and validated separately.

Why Price per Kilogram Is Not Enough

A direct comparison of the quoted price per kilogram may produce the wrong commercial conclusion.

The first useful calculation is:

Unit Active Cost =
Product Price per kg ÷ Pyrethrins Fraction

For a nominal 50% grade:

Unit Active Cost = Price per kg ÷ 0.50

For a nominal 70% grade:

Unit Active Cost = Price per kg ÷ 0.70

For a more precise batch calculation, the actual COA assay can be used.

Based on the reviewed batches:

50% batch:
Price per kg ÷ 0.5012

70% batch:
Price per kg ÷ 0.7012

Before finalizing the comparison, buyers should also confirm whether commercial pricing and formulation calculations are based on:

• nominal concentration;
• guaranteed minimum assay;
• specification midpoint;
• actual batch result;
• another contractually agreed basis.

For example, a “50% grade” may have a permitted range of 48%–52%. A “70% grade” with a range of 70.0% ± 1.75% may also vary within its approved limits.

The contract should make clear what the buyer is purchasing and how an out-of-target or low-side assay would be handled.

Total commercial cost may also include:

• international freight;
• packaging;
• warehousing;
• drum handling;
• production losses;
• dilution work;
• additional testing;
• formulation revalidation;
• rejected or unstable finished batches.

The lowest product price is not always the lowest total formulation cost.

Concentration and BHT Status Are Separate Variables

BHT, or butylated hydroxytoluene, is an antioxidant. It is not one of the six natural pyrethrin esters.

Commercial refined pyrethrum extract may be offered with BHT or as a separately defined BHT-free grade. Supplier product ranges that list regular and BHT-free concentrates demonstrate that concentration and antioxidant status are independent purchasing variables.

Buyers should therefore confirm two separate points:

1. Is the product 50% or 70% total pyrethrins?
2. What antioxidant or stabilization system does it contain?

A 70% concentrate is not automatically BHT-free.

Similarly, BHT-free does not automatically mean:

• higher pyrethrins content;
• better quality;
• better formulation performance;
• suitability for every destination market.

For a BHT-free grade, the buyer should review:

• the supplier’s stabilization strategy;
• storage instructions;
• packaging controls;
• available stability data;
• expected shelf life;
• compatibility with the intended formulation.

It should not be assumed to behave identically to a BHT-containing grade.

Why the Carrier or Solvent System Matters

The total pyrethrins percentage does not disclose the complete liquid composition.

Two products with the same assay may contain different:

• carriers;
• solvents;
• antioxidant systems;
• refining-related components;
• residual impurities.

These differences may affect:

• solubility;
• emulsification;
• viscosity;
• color;
• odor;
• compatibility with surfactants;
• compatibility with propellants;
• low-temperature behavior;
• finished-product stability;
• regulatory documentation.

Therefore:

A 50% concentrate from one supplier should not automatically be treated as equivalent to a 50% concentrate from another supplier.

The same principle applies when changing from 50% to 70%.

Before changing concentration or supplier, buyers should request:

• current TDS;
• representative COA;
• carrier or solvent declaration;
• antioxidant declaration;
• density data;
• relevant solubility or compatibility information;
• representative sample.

Final suitability should be confirmed in the buyer’s actual formulation and manufacturing process.

What Buyers Should Check on the COA

A COA should be reviewed as evidence for a specific batch, not merely as proof that the supplier sells a product called Pyrethrin.

Product Identity

Confirm:

• commercial product name;
• concentration grade;
• botanical source;
• batch number;
• manufacturing date;
• expiration or retest date.

The reviewed documents identify the botanical source as Tanacetum cinerariifolium.

Total Pyrethrins Assay

Check:

• the assay specification;
• actual batch result;
• analytical method;
• reporting basis.

The reviewed 50% batch states:

Specification: 48%–52%
Result: 50.12%
Method: HPLC

The reviewed 70% batch states:

Specification: 70.0% ± 1.75%
Result: 70.12%
Method: HPLC

For accurate dosing, formulators may use the actual batch assay where appropriate and permitted by their manufacturing controls.

Pyrethrin I / Pyrethrin II Entry

The reviewed 50% COA includes an item written as:

Pyrethrin I / Pyrethrin II

with:

Specification: 1.0–2.0
Result: 1.22

No unit, calculation basis or method explanation is shown.

The buyer should therefore ask the supplier to explain exactly what the result represents before using it for:

• supplier comparison;
• specification approval;
• formulation development;
• regulatory documentation.

It should not be assumed to represent a ratio or an individual ester percentage without written clarification.

Antioxidant Status

Confirm:

• whether BHT is added;
• BHT specification;
• actual batch result;
• whether another antioxidant is used;
• whether a BHT-free declaration is available.

An omitted BHT row should not be interpreted as proof of absence.

Physical and Chemical Controls

Depending on the agreed specification, relevant fields may include:

• appearance;
• color;
• odor;
• moisture;
• density;
• acetone insolubility;
• viscosity;
• acidity-related test.

Any numerical item should be reviewed together with its analytical method.

For example, the pH values in the reviewed COAs require clarification because the sample-preparation method is not stated.

Batch Traceability

The final COA should correspond to the actual batch shipped.

A sample or typical COA may be useful during supplier evaluation, but it should not replace the batch-specific document issued for commercial goods.

Pyrethrin Concentrate Is Not the Same as a Synergized Formulation

Piperonyl butoxide, commonly known as PBO, is a synergist often used with pyrethrins in downstream insecticide formulations.

PBO is not one of the six natural pyrethrin esters. NPIC describes it as a human-made synergist that is not intended to harm insects by itself but is used with insecticides to increase their effectiveness.

Buyers should distinguish between:

• refined pyrethrum extract;
• pyrethrin concentrate containing a carrier and antioxidant;
• a pyrethrin-and-PBO blend;
• a finished insecticide formulation.

Before ordering, confirm whether the quoted material contains:

• pyrethrum extract;
• carrier or solvent;
• BHT or another antioxidant;
• PBO;
• another synergist or formulation additive.

A raw pyrethrin concentrate and a synergized downstream formulation are not the same purchasing item.

Packaging and Storage Considerations

The reviewed COAs describe both grades as yellow oily liquids with a characteristic odor.

Commercial supplier information shows that refined pyrethrum extracts may be packed in sealed HDPE containers and may be quoted in weight- or volume-based formats.

Buyers should confirm:

• net weight per container;
• nominal container volume;
• product density;
• container material;
• sealing requirements;
• storage temperature;
• protection from light;
• shelf life;
• handling after opening.

Quotations expressed in kilograms and liters are not directly comparable unless density is known.

Storage requirements should be confirmed separately for:

• BHT-containing grades;
• BHT-free grades;
• different carrier systems;
• opened and unopened packaging.

The current supplier TDS and SDS should remain the controlling documents for storage and handling.

Questions to Ask Before Ordering

Before requesting a sample or commercial quotation, buyers should confirm:

1. Is the product 50% or 70% total pyrethrins?
2. What is the guaranteed assay range?
3. What is the actual available-batch result?
4. Which analytical method is used?
5. Is pricing based on nominal grade, minimum assay or actual assay?
6. Is BHT added?
7. What is the BHT specification and actual result?
8. Is a BHT-free declaration available?
9. What carrier or solvent system is used?
10. Does the product contain PBO or another synergist?
11. What does the “Pyrethrin I / Pyrethrin II” COA item represent?
12. Are the six individual ester results available, if required?
13. What density applies to the supplied batch?
14. How is any pH or acidity-related value measured?
15. Does the sample represent the proposed bulk specification?
16. What packaging and storage conditions apply?
17. What are the MOQ, lead time and commercial batch size?
18. Which technical and regulatory documents are available?

Providing the intended application, target active level, current specification and destination market will help the supplier recommend the appropriate grade for testing.

Practical Selection Summary

A 50% grade may be appropriate when:

• the existing formulation has already been validated with 50%;
• the manufacturing process is designed around a 50% concentrate;
• the buyer requires the specific BHT-stabilized specification shown in the reviewed COA;
• changing concentration would create unnecessary revalidation work.

A 70% grade may be appropriate when:

• higher active-content density is commercially useful;
• reducing concentrate addition is important;
• freight, drum count and warehouse space matter;
• the manufacturing process can accurately handle the higher concentration;
• formulation compatibility has been confirmed.

For either grade, buyers should confirm:

• actual total pyrethrins assay;
• assay range and method;
• antioxidant status;
• carrier system;
• physical properties;
• formulation compatibility;
• commercial calculation basis;
• batch documentation;
• packaging and storage requirements.

The central procurement principle is:

Do not choose Pyrethrin Oil only by concentration or product price per kilogram. Select it against an agreed specification and the requirements of the final formulation.

Bulk Pyrethrin Oil Supply

Lifeworth supplies natural Pyrethrin Oil concentrate in 50% and 70% grades for qualified insecticide formulation and commercial sourcing projects.

Supply discussions may include:

• 50% or 70% grade selection;
• current specification comparison;
• representative sample arrangement;
• batch COA;
• TDS and SDS/MSDS;
• BHT-status confirmation;
• packaging and labeling;
• trial and commercial quantities;
• export documentation.

Buyers with an existing specification, current supplier COA or formulation requirement can send it for comparison before arranging a sample or bulk order.

Review our bulk Pyrethrin Oil 50% and 70% supply options or contact our ingredient sales team with your target concentration, application, quantity and destination market.

References

1. FAO/WHO Joint Meeting on Pesticide Residues. Pyrethrins Evaluation: Identity and Six Active Esters.
2. FAO/WHO Joint Meeting on Pesticide Residues. Total Pyrethrins Residue Definition.
3. National Pesticide Information Center. Pyrethrins General Fact Sheet.
4. National Pesticide Information Center. Piperonyl Butoxide General Fact Sheet.
5. Supplier batch COAs reviewed for Pyrethrin Oil 50% and 70%.