Chloroprene rubber supplier
Gandi Chemical Solutions supplies chloroprene rubber — polychloroprene, commonly called neoprene, CAS 9010-98-4 — to adhesive and sealant manufacturers in four grades: CR2322, CR2442, CR2443 and CR2444. What separates them is crystallisation rate and viscosity, which together set open time and the body of the finished adhesive.
Grades held
4 grades of polychloroprene, CAS 9010-98-4. Each one links to its full specification, safety data and packaging.
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CR2443 — fast grab
Fast crystallising
A sulphur-modified adhesive grade that dissolves readily in the usual solvent blends, gives high initial grab and builds green strength quickly.
View the specification
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CR2444 — longer open time
Medium crystallising
A slower crystallisation rate than CR2443, which translates directly into a longer open time on the bench — the grade for large panels that cannot be mated within a minute of coating.
View the specification
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CR2442 — high viscosity
High Mooney viscosity
More body in the finished adhesive, less sag on a vertical surface and higher heat resistance in the cured bond, at the cost of more solvent to reach a workable spreading viscosity.
View the specification
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CR2322 — extended open time
Slow crystallising
From the 23xx series. Slow crystallisation gives a long open time and a more flexible, less brittle bond line, which suits sealants and joints that move.
View the specification
What decides the grade
Every grade here is the same polymer. The series number says what it was formulated for, and the two properties worth arguing about are crystallisation rate and viscosity.
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Open time comes first
How long between coating and mating? A shoe sole is seconds and takes a fast-crystallising grade; a laminated panel is minutes and takes a slow one. Getting this wrong is the most common reason a contact adhesive fails on the bench.
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Viscosity sets the body
A high-Mooney grade gives an adhesive that holds on a vertical surface and resists heat in the cured bond. It also needs more solvent to spread, so the decision is a formulation cost as well as a performance one.
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23xx or 24xx
The 24xx series is formulated for adhesives: it dissolves readily and builds green strength quickly. The 23xx series crystallises slowly and stays flexible, which is what a sealant or a moving joint needs.
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Blending
Grades are routinely blended rather than chosen outright — a fast grade for grab with a slow grade for open time. Tell us the working window you need and GCS quotes the pair rather than making you find it by trial.
Supply, documentation and handling
Packaging
Chip or sheet in standard bagged units, packed to your requirement. State the dissolving equipment, because it decides the form worth shipping.
Documentation
A safety data sheet ships with every consignment. A certificate of analysis stating Mooney viscosity is issued on request, and it is the figure worth checking on arrival.
Storage
Cool, dry and out of sunlight. Polychloroprene crystallises slowly in storage and warm conditions shorten its shelf life, so stock should be rotated rather than held.
How it is quoted
Priced by quotation. Send the open time you need, the substrate and the monthly volume, and GCS quotes the grade or the blend against them.
Before you order chloroprene rubber
Is chloroprene rubber the same as neoprene?
Yes. Neoprene was the original trade name for polychloroprene and the two are used interchangeably in the trade. CAS 9010-98-4 covers both, and every grade on this page is the same polymer at a different crystallisation rate and viscosity.
Which grade gives the longest open time?
CR2322, from the slow-crystallising 23xx series, followed by CR2444. Both are chosen where a large surface has to be coated and positioned before the adhesive sets, and CR2322 also leaves a more flexible bond line for a joint that moves.
What does a high-viscosity grade change?
The body of the adhesive. A higher Mooney viscosity means less sag on a vertical surface and better heat resistance in the cured bond, and it means more solvent to reach a spreadable viscosity. CR2442 is the grade to compare against your current formulation.
Can grades be blended?
Routinely. A fast-crystallising grade supplies initial grab and a slower one extends the working window, and most production adhesives sit somewhere between the two. Send the open time and the grab you need and the blend is quoted rather than discovered.
Still deciding between grades? Send the duty and the volume, and GCS comes back with what it costs and when it lands. Request a Quote
