Lanolin (USP / Anhydrous Wool Wax) Storage & Tank Compatibility

Storing Lanolin (USP / Anhydrous Wool Wax)? Start Here

Lanolin USP (anhydrous wool wax, also called wool grease or wool fat) is a complex natural mixture recovered from the scouring of sheep's wool. It is not a single compound: roughly 75-90% is wax esters formed from long-chain branched and hydroxy fatty acids esterified with sterols such as cholesterol and lanosterol, together with free lanolin alcohols and acids. The result is a yellow, tenacious, unctuous semisolid that melts near 36-42°C, is insoluble in water, and is freely soluble in ether and chloroform.

Industrially it is a workhorse emollient and water-in-oil emulsifier for ointments, salves, cosmetics, lubricants, leather and rust-preventive coatings. Because lanolin is chemically mild and near-inert at ambient temperature, material-of-construction (MOC) decisions hinge on handling temperature, melt/dispense logistics, and protecting the product's color and odor — not on corrosion or solvent attack.

Is Lanolin Compatible With Polyethylene (HDPE / XLPE) Tanks?

Yes — for ambient bulk storage, polyethylene is a sound choice. Lanolin is a near-inert natural wax/oil rather than an aggressive solvent or acid, and published polyethylene chemical-resistance charts rate animal and vegetable oils and waxes as Resistant at roughly 20°C, with lanolin (wool fat) specifically marked compatible. Standard-density HDPE and crosslinked (XLPE) polyethylene tanks handle anhydrous lanolin well at room temperature.

The honest caveat is temperature: PE charts down-rate oils and fats at ~60°C, and lanolin must be warmed above its ~36-42°C melt range to pump or transfer. For any heated, jacketed, or melt-and-fill operation, move the hot duty to stainless steel and keep the polyethylene tank for cool, static storage. Long-term contact with warm oil can also promote environmental stress cracking in PE, so size and grade the tank conservatively and avoid hot fills.

Material compatibility at a glance

Lanolin is a near-inert natural wax/oil, so material selection is driven by handling temperature and product purity rather than chemical attack. HDPE and XLPE polyethylene are compatible for ambient bulk storage; stainless steel is preferred wherever the wax is melted, jacketed, or pumped warm. Avoid prolonged hot oil/wax contact with EPDM elastomers.

Ratings: S suitable · C conditional / limited · U unsuitable. Verify against the cited resistance charts and your concentration/temperature before specifying.

The safety that actually matters

• Lanolin is generally not classified as a hazardous substance under GHS — no signal word, pictograms, or hazard statements on typical SDSs (always verify the specific supplier SDS).
• It is a combustible organic solid/wax; flash point is usually not determined, but it will burn once melted and ignited. Autoignition is reported around 445°C.
• Keep away from open flame, hot surfaces, and strong oxidizers; molten lanolin can splash and cause thermal burns.
• Spills create a slippery oil/wax film — contain, absorb with inert media, and clean to prevent slip hazards.
• May cause mild skin sensitization in susceptible individuals; use gloves and basic PPE for prolonged handling.
• Store cool and dry, away from ignition sources; protect from prolonged heat to preserve color, odor and product quality.

Common questions

Can I store lanolin in an HDPE or XLPE poly tank?

Yes for ambient storage. Lanolin is a near-inert natural wax/oil, and polyethylene resistance charts rate animal/vegetable oils and waxes as compatible at room temperature. Keep the product cool and static; move any heated or melt-transfer duty to stainless steel.

Is lanolin hazardous or flammable?

It is generally not GHS-classified as hazardous — no signal word or pictograms on typical SDSs. It is a combustible wax (flash point usually not determined, autoignition near 445°C) that will burn once melted and ignited, so keep it away from flame and strong oxidizers. Confirm against your supplier SDS.

Why does temperature matter for lanolin storage tanks?

Lanolin melts around 36-42°C and must be warmed to pump or transfer. Polyethylene's resistance to oils and waxes drops at elevated temperature, and warm oil contact can promote stress cracking, so hot or jacketed handling belongs in stainless steel while PE handles cool storage.

What gaskets and seals work with lanolin?

FKM (Viton) and Buna-N (NBR) handle fatty oils and waxes well. Avoid EPDM, which swells in oils and fats. For melt-handling skids, stainless wetted parts with FKM seals are a reliable combination — verify against your service temperature.