What rattan is and how it ages
Rattan sticks are made from dried rattan stems. Rattan is hard, tough, and light, and according to an overview of eskrima it only frays under the worst handling and does not shatter like wood, which makes it a safer training tool. Over time a stick frays at the ends and in the striking area, and softens. According to a study on rattan anatomy, the vascular bundles are densest at the stem's circumference, and the core is softer.
An FAO publication on rattan processing states that a fresh stem contains 130 to 160% water, is dried below 20% for processing, and that damp rattan (50 to 100%) is attacked by borers and blue stain. Immature or upper parts of the stem shrink and warp more.
Heat-treating: what we know about it
Sellers describe heat-treated (burnt, heat-treated, fire-hardened) sticks as harder and more durable, and say the pattern left by heat treatment improves grip; this is a seller's claim, not a measurement. A laboratory study of the rattan species Calamus simplicifolius found that steam treatment at 160°C for one hour reduced water content by about 45%, reduced water absorption, and gave the highest impact toughness. At 200°C, toughness dropped sharply and the material became brittle, because hemicelluloses and cellulose break down. Further research shows that heat lets rattan be bent and straightened: hemicelluloses soften and hold the new shape after cooling. Industrially, rattan is treated by immersion in hot oil, which reduces water content and prevents degradation.
These laboratory and industrial procedures, however, do not correspond to surface heat-treating a stick with a flame, and we found no measurements of heat-treated training sticks in the sources. So sources disagree: sellers promise greater durability, while research shows a benefit only in a narrow temperature range and embrittlement on overheating.
Oil, soaking, and storage
Recommendations vary. One school of Filipino martial arts advises soaking sticks for a day in cold, heavily salted water and then repeatedly impregnating them with oil: olive oil, a mix of two parts boiled linseed oil to one part turpentine, or tung oil. On industry forums, by contrast, practitioners use the stick untreated and only address fraying once it appears. According to FAO, damp rattan is attacked by insects and fungi, so store sticks in a dry place.
Taping
Tape protects a stick against fraying and, according to manufacturers, extends its life. One equipment maker recommends hockey tape on the striking area, non-slip tape on the grip, and a small wrap at the end of the handle (punyo) for better control. Another maker offers cotton tape with rubber adhesive, water-resistant and tear-resistant, stressing that it is not meant for grip; they recommend always keeping some in a training bag.
On an industry forum, practitioners describe electrical tape (lighter than duct tape, and useful for colour-coding sticks), cloth tape, racket tape (one layer is enough), and gaffer tape, which leaves no adhesive residue; hockey tape, they say, gets dirty. One school notes that electrical tape is just a patch on frayed rattan and that in the past sticks used to be wrapped entirely before their first use.
When to replace a stick
We found no fixed criterion in the sources for retiring a rattan stick. Practitioners describe only a procedure: when an end starts to soften and fray, tape it firmly. A cheap stick, they say, lasts a long time even untreated. So watch the ends and striking area and tape them in time.
Common mistakes
Letting an end fray before taping it. A stick stored in damp conditions. Confusing rattan with hardwood: according to an overview of eskrima, hardwood sticks (kamagong, bahi), sometimes heat-treated and hardened, are not usually used for sparring.
Which weapons this applies to
Rattan sticks for eskrima, arnis, and kali, single or paired, longer rattan staffs, and other rattan training weapons.