Raw and parboiled rice can come from the same paddy. The difference is a soak, a steam and a dry before milling, and it changes how the grain mills, looks, cooks and keeps. For a bulk buyer, the right choice depends on how your customers cook rice and how long it will spend in the supply chain. This guide compares the two and sets out what to specify.
Key takeaways
- Parboiling is done on paddy before milling. Raw rice goes from dried paddy straight to the mill.
- Parboiled rice is harder, usually breaks less in milling and cooks firmer and less sticky, but takes longer to cook.
- Milled parboiled rice keeps more B vitamins than milled raw rice, though milling degree, washing and cooking all reduce what reaches the plate.
- Choose by end market: firm, separate grains and long holding favour parboiled; soft, freshly cooked rice favours raw.
In this guide
How the two processes differ
For raw rice, dried paddy goes straight to husking, whitening, grading and sorting. For parboiled rice, the paddy is first soaked in water, steamed so that the starch gelatinises, and dried back to milling moisture. Codex defines parboiled rice in the same way: soaked, heat-treated until the starch is fully gelatinised, then dried. Both are milled on the same Satake line at Ghentugachhi; the full sequence is in how parboiled rice is processed.
Side-by-side comparison
The differences below are typical, not guaranteed. Variety, the intensity of parboiling, drying and the degree of milling all shift the result, which is why the final specification is confirmed against your requirement.
| Factor | Raw rice | Parboiled rice | What qualifies it |
|---|---|---|---|
| Process | Dried paddy is milled directly. | Paddy is soaked, steamed and dried, then milled. | Same milling line; extra water, steam, time and drying for parboiled. |
| Colour | White to chalky white. | Cream to yellow; darker with heavier heat treatment. | The colour range is a specification point. |
| Hardness and milling | Softer; more grains break in milling. | Harder and translucent; usually fewer brokens. | Fast or uneven drying can crack parboiled grain and remove the advantage. |
| Cooking | Cooks faster; softer and stickier. | Takes longer; firmer, more separate grains that resist clumping. | Varies by variety and degree of parboiling. |
| B vitamins | Lower after milling; more lost in washing. | Higher after milling, because vitamins move into the kernel. | Some thiamine is lost to heat; heavy milling and washing reduce both types. |
| Keeping quality | Fat-splitting enzymes stay active in the bran residue. | Heat inactivates those enzymes, limiting rancidity. | Storage life still depends on moisture, packing, hygiene and pest control. |
| Bran by-product | Raw rice bran. | Bran richer in oil and protein. | Sold separately to oil extraction and feed buyers. |
Milling performance and brokens
Steaming gelatinises the starch and hardens the kernel, so parboiled paddy usually yields more whole grain and fewer brokens than raw paddy of the same lot. A review in the Journal of Food Engineering found that parboiling, performed properly, substantially reduces broken kernels, and that fissures are the main cause of breakage (Buggenhout and others, 2013). The advantage is not automatic. FAO notes that parboiled grain needs more milling pressure and can fissure if it is dried too fast, especially below about 18% moisture. A well-run dryer is as important as the parboiling itself.
Cooking and eating quality
Parboiled rice takes longer to cook than raw rice. Cooked, the grains are firmer, less sticky and less likely to clump or break up, which suits bulk cooking and food that is held hot before serving (FAO). Raw rice cooks softer and stickier and is preferred where rice is cooked fresh and eaten that way. Parboiling also changes flavour, so buyers switching between the two usually test samples first.
Nutrition
During parboiling, water-soluble vitamins move from the bran into the kernel, so milling removes less of them. In the trials FAO compiles, milled parboiled rice held roughly three to five times the thiamine (vitamin B1) of milled raw rice from the same paddy, even though heat destroys part of it. Washing losses are also smaller: thiamine lost in washing was 22–59% for raw milled rice against 7–15% for parboiled milled rice (FAO, Table 41).
These are comparisons between processes, not health claims for a particular product. The degree of milling, washing and cooking method all change what is eaten.
Storage
Parboiling inactivates the enzymes that break down fats in the bran layer, which limits rancidity, and milled parboiled rice is generally regarded as keeping well. FAO also points out that parboiled paddy, with its slightly opened husk, can be more exposed to insects. In practice, moisture at packing, the bag, the store and pest control decide shelf life for either type. FAO gives about 14% moisture as generally safe for storage in tropical conditions.
Why the two are priced differently
Parboiling adds water, steam, time and drying capacity, but it usually recovers more whole rice from each tonne of paddy. How those effects balance depends on the crop, the variety and the season, so the gap between raw and parboiled quotations for the same variety is not fixed. By-products differ too: parboiled bran and raw bran are sold separately, and husk is burned in the mill’s own boiler.
Which one to ask for
- Parboiled suits buyers who want firm, separate grains, cook in bulk or hold cooked rice before serving, such as canteens, hostels, caterers and many institutional and wholesale channels.
- Raw suits markets that prefer a soft, white grain cooked fresh, and dishes that rely on stickier rice.
- Not sure? Tell us the end market and how the rice is cooked, and ask for samples of both before you commit.
SONIK mills both, for example Swarna parboiled rice and Swarna raw rice. See all products, then use the bulk order checklist to specify colour, brokens, moisture, polish and packing.
Frequently asked questions
Is parboiled rice the same as brown rice?
No. Brown rice has the husk removed but is not whitened. Parboiled rice can be milled to any degree, from lightly milled to fully white and polished.
Does Sortex or silky finishing apply to both types?
Yes. Colour sorting and polish are finishing steps after milling, separate from the choice of process. Our guide to Sortex, grading and polishing explains how to specify them.
Why does parboiled rice look darker in some lots?
Colour depends on soaking temperature and time and on how intense the steaming is. A heavier treatment gives a deeper cream or yellow grain. If colour matters in your market, agree a reference sample.
Sources
- FAO (1993). Rice in human nutrition, chapter 5: post-harvest processing and parboiling, including Table 39 on thiamine.
- FAO (1993). Rice in human nutrition: home preparation and cooking, Table 41 on washing losses.
- Buggenhout, J., Brijs, K., Celus, I. and Delcour, J.A. (2013). The breakage susceptibility of raw and parboiled rice: a review. Journal of Food Engineering 117(3), 304–315.
- Codex Alimentarius. Standard for Rice (CXS 198-1995).
