What Is Norbornanediamine/Resorcinol Diglycidyl Ether Crosspolymer?
Norbornanediamine/Resorcinol Diglycidyl Ether Crosspolymer is a mouthful of a name for a modern synthetic ingredient designed to create a flexible film on the skin or hair. Chemically it is formed by linking a bicyclic molecule called norbornanediamine with resorcinol diglycidyl ether, resulting in a cross-linked polymer network. This network is what gives the ingredient its strong yet lightweight film-forming ability.
The building blocks themselves were first studied in industrial coatings where durability and resistance to wear are essential. Formulators later realized that the same technology could offer similar protective qualities in beauty products without feeling heavy. By the late 2000s you could find this polymer in select specialty skincare and hair styling launches, and its use has gradually expanded as brands look for non-tacky ways to lock active ingredients in place.
Manufacturing starts with norbornanediamine, a bicyclic amine derived from petroleum feedstocks, and resorcinol diglycidyl ether, an epoxy compound also sourced from petrochemical intermediates. In a controlled reaction these two parts link together, creating long chains that then connect with each other to form the final crosspolymer. The finished material is purified, dried, then milled into a fine powder or supplied as a pre-dispersed liquid for ease of blending into cosmetic bases.
You will most often spot Norbornanediamine/Resorcinol Diglycidyl Ether Crosspolymer in leave-on face masks, long-wear foundations, anti-aging serums, hair styling creams and certain high-performance sunscreens. In each of these products its thin invisible film helps the formula stay put and enhances the feel of smoothness on skin or strands.
Norbornanediamine/Resorcinol Diglycidyl Ether Crosspolymer’s Cosmetic Benefits/Uses
In beauty formulas this ingredient serves one key purpose that brings several practical perks.
As a film forming agent it creates a breathable layer that clings closely to the surface of skin or hair. This film helps seal in moisture, improves the wear time of makeup, prevents active ingredients from evaporating too quickly and lends a soft, silky finish that resists flaking or cracking throughout the day.
Who Can Use Norbornanediamine/Resorcinol Diglycidyl Ether Crosspolymer
This polymer is considered gentle enough for all skin types, including dry, normal, combination and oily. Because it forms a light breathable film rather than a greasy layer it seldom clogs pores, so most acne-prone users tolerate it well. Sensitive skin can usually handle it too, though anyone with a history of reacting to synthetic resins should approach with extra care.
The material is fully synthetic and contains no animal-derived components, making it suitable for vegans and vegetarians. Its manufacturing process does not rely on animal testing in regions that outlaw the practice, though final product policies vary by brand.
Current research shows no reason why pregnant or breastfeeding women must avoid this ingredient when it is used topically and in the low levels found in cosmetics. That said this information is not medical advice. Anyone who is expecting or nursing should show the full ingredient list of any product to their physician to be certain it fits their personal needs.
The polymer does not absorb UV light so it does not make skin more sensitive to the sun. It can actually help sunscreen stay put by locking the formula in place. No other special precautions are known at this time.
Potential Side Effects/Adverse Reactions
Side effects from topical use can differ from person to person. The issues listed below are only potential reactions and are unlikely to occur for the average user when the product is formulated and used as directed.
- Mild skin irritation such as redness or itching, usually in people with very sensitive skin
- Allergic contact dermatitis in rare cases where the user is specifically allergic to epoxy-based resins
- Temporary clogged pores or small breakouts if very heavy layers are applied on already congested skin
- Eye stinging or watering if the product accidentally migrates into the eyes
- Dry or stiff feeling on hair if a styling formula containing high levels is not fully rinsed out
If any uncomfortable reaction occurs stop using the product and consult a healthcare professional for guidance.
Comedogenic Rating
Rating: 1 (very low likelihood of clogging pores)
This polymer sits on the surface in a thin breathable layer and has a high molecular weight that prevents it from seeping into pores. It is not oily or waxy so it lacks the greasy profile usually linked to breakouts.
Because of this low rating it is generally considered suitable for people prone to acne or congestion.
Keep in mind that finished formulas can still trigger blemishes if they contain other pore-clogging ingredients or if they are not removed properly at the end of the day.
Summary
Norbornanediamine/Resorcinol Diglycidyl Ether Crosspolymer is mainly a film former that holds actives in place, locks in moisture, boosts makeup longevity and leaves skin and hair feeling smooth. It achieves these perks by creating an invisible flexible network on the surface that resists flaking and wash-off.
While effective, it is not yet a household name. You will mostly find it in select long-wear foundations, masks and high-performance sunscreens rather than in everyday moisturizers.
Current evidence points to a good safety profile with a very low comedogenic rating. Still, skin can react unpredictably, so it is wise to patch test any new product containing this polymer before full-face use.