What it is
Whole milk powder differs from skim milk powder in one respect that changes almost everything about how it is handled: it carries its fat. Standardised full-cream milk is pasteurised, preheated, evaporated to a concentrate and spray dried, and the resulting particle holds milk fat distributed between an encapsulated phase and a surface phase. Composition sits near 26% to 28% fat with protein at a minimum of 34% of the milk solids-non-fat, which works out at about 25% of the powder as supplied. Instant grades are agglomerated and, in some cases, lecithinated to improve wetting.
Formulation considerations
Oxidative stability governs purchasing and storage decisions. Specify a peroxide value on receipt, keep the material cool and buy to a turnover rate rather than holding long. In chocolate, free fat content and particle size are the parameters to discuss with a supplier, since both influence refiner behaviour, viscosity and final texture, and a powder selected on composition alone may not run the same way as the one it replaced. In bakery and confectionery the lactose and protein drive Maillard browning and give the cooked-dairy and caramel notes sought in toffee, fudge and sweet biscuits. For recombining, instant agglomerated grades disperse with far less shear than regular grades.
Applications
Typical uses are milk and compound chocolate, caramel and toffee, sweet bakery, recombined full-cream and UHT milk, ice cream mixes, instant beverage premixes and dairy culinary sauces. Available in bulk quantities, with pricing on application.
Applications
- Milk and compound chocolate
- Recombined full-cream milk and UHT beverages
- Caramel, toffee and fudge
- Sweet biscuits and cake mixes
- Ice cream and frozen dessert mixes
- Instant beverage and malt-drink premixes
- Dairy-based culinary sauces
Handling and storage
Store in sealed original packaging below 20°C in a dry store with relative humidity under 65%. Typical shelf life is 12 months from manufacture, shorter than skim milk powder because the fat fraction is subject to oxidative deterioration. Keep away from light, heat and aromatic materials, rotate stock on a first-expiry basis and reseal part-used sacks immediately. Gas-flushed packaging extends usable life where long holding periods are expected.
Common questions
Why does whole milk powder have a shorter shelf life than skim milk powder?
The 26% to 28% fat fraction can oxidise, which eventually produces tallowy or cardboard notes. Cool, dark, dry storage and intact packaging are the controlling factors, and nitrogen-flushed packaging is used where the holding period is long.
What does free fat mean and why does the chocolate industry ask about it?
Free fat is the portion of milk fat accessible at the particle surface rather than encapsulated in the lactose-protein matrix. In chocolate it acts as part of the continuous fat phase, so a higher free fat level lowers viscosity and can reduce the cocoa butter needed. Spray-dried agglomerated powder has relatively low free fat; roller-dried and specially processed grades have substantially more.
Can I substitute whole milk powder for skim milk powder plus butter?
Functionally yes, and the combination is widely used in the other direction. Matching on both fat and milk solids-non-fat gives equivalent composition, but the flavour profile and the state of the fat differ, so the substitution should be trialled rather than assumed.
How is it reconstituted to full-cream milk?
Approximately 13% powder in water returns the total solids of fluid full-cream milk. Dispersing into water at around 40°C to 45°C with moderate agitation, then holding to hydrate, gives the most consistent result.