Sunscreen OEM Basics: How a UV Formula Is Built for a Brand Brief

The first surprise for a brand moving from serum or cream into sun care is that the brief does not behave like a normal skincare brief. A moisturiser can be adjusted at the sampling stage without changing its regulatory shape, but a UV product carries a filter load, a testing obligation & a labelling rule set that follow it from the first formula version to the shelf, so the decisions made in week one decide what the label can & cannot say six months later.

This article works through how a UV formula is actually built around a brand brief, from the claim you want to make down to the filter combination, the phase structure, the order of addition & the testing that supports the wording. By the end you should be able to write a brief that a factory can price, sample & defend, rather than a wish list that gets rewritten three times.

Why a sunscreen brief is not like a normal skincare brief

A standard skincare brief usually opens with texture, fragrance & a target audience, & the formula is built to hit those marks. A sun care brief has to open with the protection claim & the markets, because those two lines fix the filter system before any texture conversation begins. The filter system then constrains the texture, not the other way round, which is the single biggest source of rework when a brand approaches sun care like another cream.

The practical consequence is that the factory needs the claim & the destination market before it can even propose a base. A product intended for a market that requires a specific testing route cannot simply borrow a base developed for a different route, because the filter load & the supporting data do not transfer. Brands that withhold this information to keep options open usually pay for it in a second development round.

There is also a documentation tail that ordinary creams do not carry to the same degree. A UV formula is reviewed for filter identity, filter concentration against the permitted list, photostability & the label wording, & that review has to be repeatable across batches. A brief that ignores this tail produces a formula that is pleasant to use but hard to register, & the registration gap is discovered at the worst possible moment.

Start from the claim you want to make, not from a filter list

The instinct of a first-time buyer is to name the filters they have read about & ask for a combination. That reverses the right order. The claim you want to make, the wording on the pack, the water-resistance statement, the audience, is what decides the filter load, & the filter load then decides which filters are even possible at the texture you want.

Working the other way, from a filter list upward, produces a formula that meets a technical spec but may not support the claim, or supports it only at a thickness nobody wants to wear. The brand ends up choosing between a heavier product & a weaker claim, & both are compromises forced by an early decision that was never made explicitly.

A cleaner opening question is what the pack will say & to whom. A daily wear product for an urban market has a different filter burden from a beach product, & the texture each one can carry is different. Stating the intended wording at the brief stage lets the factory propose a base that reaches the claim without exceeding the skin-feel budget, & that single alignment removes most of the sampling churn.

UV filters are the spine, not an add-on

In a normal emulsion the active is a small part of a larger system. In a UV formula the filters are a large part of the oil phase by weight, & they dictate the emulsifier choice, the viscosity & the feel. Handling them as an additive to an existing cream base is why so many first sunscreen projects feel greasy, pill or separate.

Organic filters dissolve in the oil phase & contribute to its character; inorganic filters are particles that scatter & reflect, & they bring opacity, a different rheology & a colour consideration. The two behave nothing alike in a tank, & a base built for one does not quietly accept the other. The brief has to state which family the brand is open to, or the factory has to guess & the sample comes back wrong.

There is also the permitted-list question. Each market keeps a list of allowed filters & the maximum concentration for each, & a filter that is fine in one region may be restricted or absent in another. A brief that names only the destination market lets the factory screen the filter set against that list at the design stage rather than at the registration stage.

Building the oil & water phases around the filters

Once the filter set is chosen, the oil phase is built to carry the organic filters into solution & to host the inorganic particles if any are used. The emollient choice is no longer only about feel; it is about solvent power for the filters, spreadability on skin & compatibility with the preservative. A solvent that feels light may not hold the filter load, & a heavy one that holds it may feel occlusive.

The water phase carries the humectants, the chelator & the preservative, & its job is to keep the bulk stable & safe rather than to shine on its own. In a UV system the water phase is also where pH is set, & pH matters because some organic filters are acid- or base-sensitive & drift in colour or stability if the buffer is wrong. Getting the pH window right is a formulation task, not a finishing touch.

The emulsifier system ties the two phases together under a high solids load, & that is harder than it sounds. A filter-rich emulsion is closer to a suspension than to a light lotion, & the emulsifier has to hold particles, dissolved actives & a preservative together through heating, cooling & filling. The wrong system gives a product that looks fine on day one & grains or separates by week six.

Solubility, photostability & order of addition

Solubility decides whether a filter stays in solution or crashes out as crystals that feel gritty & look cloudy. Each organic filter has a solvent preference, & the order in which the phases are combined changes whether those preferences are respected. A base that ignores this produces a sample that passes appearance at the factory & fails it after a warm truck ride.

Photostability is the quieter risk. Some organic filters change under light, & a formulation either stabilises them with partners & antioxidants or accepts a different performance profile. This is a chemistry decision made at the bench, not a label decision made later, & it is one of the reasons two formulas with the same filter list can behave differently on skin.

Order of addition sounds like a technician's detail & it is, but it is the kind of detail that decides repeatability. When the filter is added before the emulsifier is formed, or the chelator is added at the wrong temperature, the batch varies from the golden sample. A factory that documents the sequence protects the brand from a complaint that the second order felt different from the first.

How SPF & PA are measured, & what the label can say

A measured SPF value is produced by a lab method on human volunteers or by an agreed alternative, & a PA grade reflects a separate measurement of the UVA behaviour. The number on the pack is an output of testing, not a property the factory sets by hand, & the brand has to understand that the claim & the test are linked: the wording has to match what was actually measured.

What can be said is bounded by the measured result & by the market's labelling rules. A brand may state the measured SPF & the PA grade on the pack where the market permits, & it may describe the product as a broad-spectrum UV filter where that wording is allowed. What cannot be said is the part that trips up new entrants: no wording that implies the product prevents a medical condition, no blocks one hundred per cent style absolute claim, & no grading that the test did not support.

The practical rule for a brief is to ask the factory what testing it can arrange & what the result can support, then build the label wording from that, rather than writing the wording first & hoping the test agrees. A claim written before testing is a liability, because the gap between the hoped-for number & the measured number is exactly where regulators & marketplaces focus.

Filter combinations & the texture they give you

The table below maps common filter approaches to the texture & feel they tend to produce, so a brand can see the trade before committing to a base. It is a formulation guide, not a claim table, & the actual SPF or PA any combination delivers is settled only by testing on the finished formula.

The rows are a starting map, not a specification. The same filter approach can feel different in two factories because the emollient & emulsifier around it differ, which is why the texture target belongs in the brief & the feel is confirmed on the golden sample rather than assumed from the filter list.

Texture, finish & skin feel targets

Texture is where sun care lives or dies with the end user, because a product that feels heavy gets used once & then ignored. The brief should name the finish, matte, satin or dewy, & the residue tolerance, because those targets decide the emollient balance & the powder or silica load long before the sample is mixed.

A common mismatch is a brand asking for light & invisible on a high mineral load; the two pull against each other, & the factory has to either lower the load or accept some whiteness. Stating the priority, protection first or feel first, at the brief stage prevents a sample that satisfies nobody. Most brands actually want feel first for daily wear & protection first for beach use, & those are different briefs.

Skin feel also includes the after-feel an hour later, which is rarely specified but always noticed. A formula that feels fine on application but balls up under makeup or leaves a film by midday will be returned by reviewers even if the technical spec is met. Asking the factory for a wear test note, even an informal one, is cheaper than learning this from marketplace reviews.

Packaging that keeps the formula stable

UV formulas are sensitive to the pack in a way ordinary creams are not, because light & air accelerate the very changes the formula is trying to resist. An airless pump protects the bulk from oxygen; an opaque or tinted tube protects it from light; a wide-mouth jar exposes both. The pack is part of the stability plan, not just a container.

The material also matters. Some organic filters & the esters that carry them interact with certain plastics or gaskets over time, & a pack that is fine for a serum can leach or swell for a sunscreen. A packaging compatibility check, where the bulk is stored in the actual component & inspected, is the step that catches this before a production run, & it is worth specifying in the brief.

For a brand watching landed cost, the pack is also where a surprising amount of the unit price sits. An airless system costs more than a tube, but it can reduce the preservative burden & extend the usable life, so the choice is not purely aesthetic. Stating the shelf-life target & the channel helps the factory propose a pack that meets the goal without overspending on features the market will not see.

Colour, odour & whether to add fragrance

A mineral base tends toward a white or grey cast that the brand may want to neutralise, & that neutralisation is itself a formulation task with its own colour-control risk. An organic base is usually clearer but can carry a residual odour from the filters, which the user reads as chemical even when it is within spec. Both need a decision in the brief rather than a surprise at sampling.

Fragrance is the divisive one. A scented sunscreen can mask the filter odour & improve the experience, but it adds an IFRA obligation, an allergen declaration & a flash-point question for air freight, & it risks irritation for the exact audience that buys sun care for sensitive skin. Many brands choose fragrance-free for the face & scented for the body, & that split should be stated, not discovered.

The IFRA 26-allergen declaration applies where a fragrance is present, & the brand should expect the factory to supply the certificate & the allergen list as part of the dossier. Skipping this to save a step is a false economy, because the missing declaration is one of the first things a market notification or a retailer audit looks for, & it is harder to assemble after the batch is made.

Stability work & what it is actually for

Stability testing for a UV formula is not a box to tick; it is the evidence that the filter load, the emulsion & the pack hold together under heat, light & time. An accelerated study compresses those conditions so the brand learns in weeks whether the product will still meet its criteria at the end of the claimed shelf life, & a real-time study confirms it for the actual period.

The items worth watching are specific to sun care: filter degradation that drops the measured value, colour drift from the filters or the fragrance, separation under cold, & package interaction. A stability report that only records appearance & pH has missed the failure modes that matter most for this category, & a brand should ask what the protocol actually covers before relying on it.

For a cross-border seller the stability summary also feeds the notification file in most markets, so the depth of the study is not only a quality question but a launch question. A brand that commissions only accelerated data can launch, but it should know that the claimed period rests on that basis & say so in the file, rather than presenting a longer claim than the evidence supports.

What to put in the brief

Write the brief so a factory can move straight to a base proposal rather than a questionnaire. State the markets first, because that single line sets the filter screen, the testing route & the labelling rules. Name the claim wording you intend, the texture & finish, the pack type & the shelf-life target, & say whether fragrance is in or out, because each of those narrows the formula space immediately.

• The destination markets, & any you plan to enter within two years.
• The claim wording you intend to use, & whether broad-spectrum language is required.
• The filter family you are open to: organic, mineral, or a blend.
• The texture, finish & residue tolerance, with daily or beach use stated.
• The pack type & whether an airless or opaque system is preferred.
• The shelf-life target & whether real-time data must exist before launch.
• Whether fragrance is included, & any allergen or IFRA constraints.
• The expected order volume & whether a low first run is needed.

Then agree the sampling sequence. A sensible path is a single base sample to confirm texture, a second to confirm the claim-supporting version, & a golden sample kept by both sides before the first production order. Briefs that skip this sequence tend to use the first sample as the launch product, & that is where most timeline slips start.

Where our capability fits

We take a sun care project from a written claim & market list to a sampled base, & we screen the filter set against the destination rules before the first mix rather than after. The emulsion is built around the filter load on our lines, the order of addition is documented for repeatability, & the golden sample is retained so the second order matches the first by reference rather than by memory.

We work with brands on private label (your brand on a proven base), OEM/ODM contract manufacturing & full custom formula development, & the documentation depth is set at the brief stage. Our adjacent lines include a vitamin C brightening face cream & a firming face cream, both produced under the same batch record & retention discipline that a UV formula needs.

Tell us the markets & the claim you want to make, & we will come back with a filter-screened base proposal, the testing route it implies & the label wording the result can support. Start at our inquiry page, email capsulebiotech@163.com, or message the right team on WhatsApp: Capsule Series (capsules only) +86 158-7655-5319, Cosmetics Series (serum, hair care, body care, fragrance) +86 158-7655-5319. For the testing background, see our UV filter compliance guide & our stability testing article.

General manufacturing information, not regulatory or legal advice. Filter permitted lists, SPF & PA testing routes, label wording rules & notification duties vary by market & by product, & the applicable requirements should be confirmed for each destination before a product is placed on sale.