What Is Bis-Methoxy Peg-13 Peg-502/Ppg-57/Smdi Copolymer?
Bis-Methoxy PEG-13 PEG-502/PPG-57/SMDI Copolymer is a lab-made ingredient that blends large molecules called polyethylene glycols (PEGs) and polypropylene glycols (PPGs) with a linking agent known as saturated methylene diphenyldiisocyanate, or SMDI. The ends of the chain are capped with a small methoxy group, Peg-13, which keeps the whole structure stable and water friendly. This tailor-made design lets the copolymer sit comfortably between water-based and oil-based ingredients, helping formulas stay the right thickness.
The technology behind this copolymer grew out of industrial polymer science in the 1990s when chemists looked for safer, softer replacements for stiff plastic-type additives. By adjusting the length of the PEG and PPG blocks and adding the SMDI link, they created a flexible network that dissolves well in water yet leaves a light film on skin. Personal care companies soon noticed that this balance could control texture without the heaviness of older waxes or gums, leading to its first cosmetic launches in leave-on lotions and hair products in the early 2000s.
Manufacturing starts with separate PEG and PPG chains produced from ethylene oxide and propylene oxide. These chains are reacted with SMDI under controlled heat to form a backbone, then methoxy Peg-13 groups are attached to “lock” the ends. Purification removes any leftover reactants, giving a clear pourable syrup that meets cosmetic-grade standards.
You will most often see Bis-Methoxy PEG-13 PEG-502/PPG-57/SMDI Copolymer in lightweight moisturizers, gel creams, sheet mask essences, anti-aging serums, hairstyling creams, sunscreens and even some cleansing balms where a smooth glide is important.
Bis-Methoxy Peg-13 Peg-502/Ppg-57/Smdi Copolymer’s Cosmetic Benefits/Uses
This ingredient plays one key role inside a formula, and that single task makes a big difference in how a product feels and performs.
As a viscosity-controlling agent, Bis-Methoxy PEG-13 PEG-502/PPG-57/SMDI Copolymer fine-tunes thickness so creams are neither runny nor gummy. It helps water-rich gels stay silky, keeps oils from separating and lets active ingredients spread evenly across skin or hair. By delivering a stable, pleasant texture it supports consistent dosing of other actives and improves the overall user experience.
Who Can Use Bis-Methoxy Peg-13 Peg-502/Ppg-57/Smdi Copolymer
Because this copolymer is non greasy and water friendly it suits most skin types including oily, dry, sensitive and combination. It has a very low comedogenic profile so even congestion-prone skin usually tolerates it well. Individuals with a known allergy to PEGs or polyurethane resins should proceed with caution since the backbone of the molecule falls in that family.
The ingredient is fully synthetic and contains no animal-derived raw materials so it is considered suitable for vegans and vegetarians.
Available safety data show no specific reproductive or developmental hazards so products containing the copolymer are generally viewed as safe for pregnant or breastfeeding users. This is not medical advice and anyone who is pregnant or nursing should review any new skincare product with a qualified health professional first to be safe.
Bis-Methoxy PEG-13 PEG-502/PPG-57/SMDI Copolymer is not known to cause photosensitivity, and it does not interfere with UV filters or self-tanners. It has no fragrance and carries no formaldehyde donors so fragrance-related or preservative-related sensitivities are unlikely.
Potential Side Effects/Adverse Reactions
Responses to topical Bis-Methoxy PEG-13 PEG-502/PPG-57/SMDI Copolymer can differ from person to person. The points below outline potential side effects yet these remain uncommon when the ingredient is used correctly in a well-formulated product.
- Mild skin irritation such as transient redness or itching, most often in people with preexisting eczema or a damaged skin barrier
- Allergic contact dermatitis in rare cases where an individual is sensitized to PEGs or trace isocyanate residues
- Stinging around the eyes if the product accidentally gets into the ocular area
- Increased penetration of other actives which could amplify the irritation potential of stronger ingredients applied in the same routine
If any discomfort, persistent redness or swelling develops discontinue use of the product and consult a healthcare professional
Comedogenic Rating
Rating: 0-1 out of 5
Bis-Methoxy PEG-13 PEG-502/PPG-57/SMDI Copolymer molecules are large, water friendly and rinseable so they sit on the skin without clogging pores. They form a lightweight film that keeps formulas smooth rather than creating a heavy, waxy layer that can trap oil and debris. Current literature and supplier data show no reports of the ingredient triggering comedones even at the higher use levels found in leave-on creams.
Because of this very low score the copolymer is generally considered suitable for acne-prone or breakout-prone skin. If a product containing it does cause congestion it is more likely due to other ingredients in the formula.
The only extra point to note is that the copolymer can help other ingredients spread more evenly, which might indirectly intensify the effect of a highly comedogenic oil if one is also present in the same product.
Summary
Bis-Methoxy PEG-13 PEG-502/PPG-57/SMDI Copolymer is a texture specialist that keeps creams, gels and serums at just the right thickness. By balancing water-loving PEG blocks with flexible PPG and locking them together with SMDI, it stabilises emulsions, prevents separation and gives a smooth glide that helps actives apply evenly.
It is not a headline ingredient so you will not see it advertised on the front of the bottle, yet formulators value it as a reliable workhorse, especially in lightweight moisturisers and hair creams where a non-greasy feel matters.
Safety reviews, acute irritation tests and years of commercial use all point to a low risk profile. Most skin types, including sensitive and acne-prone, tolerate it well. As with any new cosmetic though, do a quick patch test first to be on the safe side.