Chlorination for Tack Control
Safety. Chlorine, hypochlorite, and bromine are oxidizing and corrosive. The process develops acidity. Neutralize before the final rinses. No copper or brass in contact with the liquor. Read the product and process SDS. Halogenation reduces tack. It does not remove natural-rubber protein. See Allergy and Skin Contact.
Executive summary
Cured dipped film is often tacky. Talc is a temporary industrial dust. Permanent de-tack in dipped-goods plants is aqueous halogenation: chlorine water, sodium hypochlorite, or bromine water, typically in a tumbler. Commercial practice mostly uses aqueous chlorine.
Handbook example: about 0.15% chlorine, 4.5–7.5 minutes at room temperature. Higher-sulfur cured goods need less chlorine time than low-sulfur films. Pair with Liquid Film Surface Finish for how the former set the face you are treating.
What halogenation does
What does halogenation mean?
Halogenation here means chlorination or bromination of the cured rubber surface. The chemistry cuts tack permanently. It is a post-cure finish on dipped goods.
Embossing a grip texture is a different operation. On industrial gloves, embossing alone is not enough when the goods need wet grip. Plants use halogenation for that job.
Solution choice
| Solution | Tack reduction | Discoloration |
|---|---|---|
| Chlorine water | About the same as bromine | Least among the three |
| Bromine water | Strong | More than chlorine |
| Hypochlorite (household-bleach type) | Less efficient | Similar to bromine |
Hypochlorite is easier to source than cylinder chlorine. Time and concentration still have to match your film’s sulfur level.
Sulfur level vs treatment time
The handbook ties treatment intensity to how much sulfur is in the cured film. Goods cured at about 1.5–1.75 phr sulfur need less chlorine time than films at 0.25–0.35 phr.
What does phr mean?
phr is parts per hundred rubber. 1.5 phr sulfur means 1.5 parts sulfur for every 100 parts rubber in the compound.
Copying a glove-line time onto a low-sulfur cast panel (or the other way around) is how you over- or under-treat.
Process discipline
A handbook liquor example: about 1.5 ml of chlorine water per 2.5 cm² of latex surface, enough to wet all of it. After the tumble:
- Neutralize 5–7 minutes in about 1% sodium thiosulfate or ammonia.
- Three water rinses, 5–7 minutes each, with tumbling.
- Dry in a warm-air tumbler at 40–46°C.
Use fresh chlorine solution for each batch. Skipping neutralize or rinse leaves acidic residues. That is a skin-contact and aging problem. See Aging, Storage and Care.
What does neutralize mean here?
The chlorination bath develops acidity. Neutralize means a follow-up bath (thiosulfate or ammonia in the handbook) that kills leftover oxidizer and brings the surface out of that acid state before you rinse and dry. Rinse water alone is not the neutralize step.
Skin contact
Chlorination changes surface chemistry for tack and drag. Residual process acids and leftover hypochlorite are why the neutralize-and-rinse window exists. Protein allergy classes still apply. Complete rinse, then a gentle dry.
Deep dives (optional)
Deep dive: Diluting the chlorine stock
Saturated chlorine water is about 0.56% chlorine. Plants dilute that stock to about 0.15% for the treatment bath.
Deep dive: Wet grip vs embossing
Industrial dipped goods use halogenation (chlorine or bromine) when wet grip matters. A textured (embossed) surface without that chemistry is not treated as a substitute in the handbook.