Section
| HS Code | 620344 |
| Productname | Rubber Adhesive CS-964 |
| Producttype | Solvent-based rubber adhesive |
| Basepolymer | Rubber/resin blend |
| Appearance | Yellow to amber viscous liquid |
| Odor | Organic solvent odor |
| Solidcontent | 25–35% |
| Viscosity | 1,500–4,000 mPa·s at 25°C |
| Density | 0.85–0.95 g/cm³ at 25°C |
| Flashpoint | Below 23°C; verify with SDS |
| Opentime | 5–20 minutes |
| Tacktime | 10–30 minutes |
| Fullcuretime | 24–72 hours |
| Peelstrength | Typically ≥1.5 kN/m on rubber/metal |
| Shearstrength | Typically ≥1.0 MPa |
| Servicetemperature | -30°C to +80°C |
| Shelflife | 6–12 months in unopened container |
| Storageconditions | Cool, dry, ventilated area away from heat and ignition sources |
| Applicationmethods | Brush, roller, or spray |
As an accredited Rubber Adhesive CS-964 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Rubber Adhesive CS-964 packaging: 1-liter metal cans, 12 cans per carton, clearly labeled with hazard and handling information. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL) – Rubber Adhesive CS-964: packages are properly labeled, secured, and stowed in a 20-foot FCL for safe transport. |
| Shipping | Ship Rubber Adhesive CS-964 in sealed, labeled original containers with SDS available. Use licensed carriers and comply with DOT/IMDG/IATA rules for flammable adhesives where applicable. Protect from heat, sparks, freezing, and physical damage; segregate from incompatible materials, keep containers upright, and report leaks immediately. |
| Storage | Store Rubber Adhesive CS-964 in a cool, dry, well-ventilated area away from heat, sparks, open flames, and strong oxidizing agents. Keep containers tightly closed, upright, clearly labeled, and in original or approved containers; protect from freezing and direct sunlight. Use grounded handling equipment, prevent vapor accumulation, and follow the manufacturer’s SDS and local storage regulations. |
| Shelf Life | Shelf life is approximately 12 months from manufacture when stored unopened in original containers at recommended cool, dry conditions. |
In automotive anti-vibration component bonding, the insertion of CS-964 into the production line is governed less by adhesive chemistry than by the metal insert surface state. Rotary indexing spray booths feed robot-mounted air-atomized guns after alkaline degreasing at 60–70°C, zinc phosphating to 1.5–2.5 g/m², demineralized water rinsing at conductivity below 20 µS/cm, and oven drying at 100–110°C. The adhesive is applied as a single coat at 12–18 μm dry film thickness, equivalent to 0.07–0.11 L/m² wet film at 25–30 wt% solids and 15–25% transfer efficiency; dip application for axisymmetric inserts uses 0–5 wt% xylene dilution to hold viscosity at 18–25 s DIN Cup 4. Compliance testing follows ASTM D429-14 Method B 90° peel on production-bonded witness coupons cured at 160°C for 12 min; European OEM submissions use ISO 813:2019. The downstream process inserts the coated metal component into a compression or injection mold, preheats it to 80–95°C, then cures an NR/SBR compound at 150–170°C under 10–20 MPa mold pressure for 6–12 min. Terminal parts include hydraulic engine mounts, torque rods, transmission mounts, and subframe bushings. On high-volume lines, the primary failure mode is not bulk adhesive fracture but thin-film edge starvation: below 8 μm DFT, salt-spray testing per ASTM B117-19 shows creep along the adhesive/steel interface, while above 22 μm DFT the adhesive can displace from the mold seal land and cause flash adhesion. Inserts must not be protected with amine-functional rust-inhibiting emulsions before bonding because these neutralize the acid-catalyzed cure of the adhesive and reduce rubber retention to below 50%.
Industrial rubber-covered rollers exhibit a characteristic adhesion failure at the core shoulder because the calendered cover compound cannot transmit consolidation pressure into the edge radius. Roller cores machined from plain carbon steel are grit-blasted to ISO 8501-1 Sa 2.5 with a 40–65 μm angular profile, then solvent-wiped with toluene or xylene and warmed 3°C above dew point before coating. CS-964 is applied by brush or high-volume low-pressure spray at 10–15 μm dry film thickness; dilution with toluene up to 10 wt% is allowed only when brush application causes lap marks. A single coat is used without an additional co-curative; for NBR covers above 65 Shore A, the adhesive supplier does not recommend a second coat because methyl ethyl ketone in conventional topcoats extracts plasticizer from the adhesive film. Adhesion is qualified by ISO 813:2019 90° peel on cured NBR/steel test plaques, and cover hardness and cylindrical runout are checked against ISO 6123-1:2015. In production, the cover compound is extruded through a crosshead die or spiral-wrapped as a calendered strip, tightly stitched with a hand roller, sealed with a polyamide wrapping tape, and cured in an autoclave at 135–145°C under 0.4–0.6 MPa steam pressure for 4–8 h depending on cover thickness. Finished components include paper mill press rollers, steel coil processing rollers, printing laminating rollers, and textile nip rollers. The main processing window constraint is edge dewetting: if the core end face cools below dew point while the next strip is wound, condensation at the adhesive surface prevents wetting and creates a discontinuity that later propagates as a crescent-shaped blister. Masking of bearing journals before blasting is mandatory because adhesive overspray on toleranced seats changes press-fit friction coefficients.
In sheet rubber lining of carbon steel process tanks and acid storage vessels, CS-964 is used as the tie coat between blast-cleaned steel and calendered natural rubber or chlorobutyl rubber. The steel shell is dry abrasive-blasted to ISO 8501-1 Sa 2.5, producing a 50–80 μm surface profile; dust and abrasive residue are removed by vacuum, and the surface is tested for soluble salts to stay below 50 mg/m² because chloride contamination causes osmotic blistering under the lining. The adhesive is applied by airless spray in one continuous pass at 15–25 μm dry film thickness; for hot-service acid linings, the lower half of the range is used to reduce solvent retention, while for ambient tank floors the upper half improves fill of the blast profile. Thinning with xylene is limited to 0–8 wt%; if thinning exceeds 8%, the spray booth LEL control must be recalculated for the added solvent load. The downstream processing is a multi-step lay-up: calendered rubber sheets are cut and solvent-wiped, the adhesive is applied to the steel and dried until tack-free but not over-baked, the sheet is laid onto the adhesive, and the laminate is consolidated with a steel hand roller from centre to edge to remove gas pockets; seams are skived at 30–45° and capped with seam strips. Autoclave cure takes place at 130–140°C and 0.3–0.5 MPa for 3–6 h. Compliance documentation for the finished lining is based on NACE SP0391 for application and inspection, ASTM D429-14 Method B for adhesion, and high-voltage spark testing for lining continuity. Terminal products include hydrochloric acid storage tanks, scrubber vessels, electroplating tank liners, and rubber-lined pipe spools. Operationally, the adhesive must not be applied below 10°C steel temperature or above 40°C because cold surfaces form latent solvent films and hot surfaces cause premature surface skinning that traps solvent. Amine-cured epoxy holding primers are incompatible with CS-964 and must not be used as an intermediate coat.
Laminated elastomeric bridge bearings and seismic isolators are built by alternating steel laminate plates with natural rubber or polychloroprene compound; CS-964 provides the vulcanization bond between the rubber layer and the blast-cleaned steel. The production process starts with blanked steel laminates shot-blasted to ISO 8501-1 Sa 2.5 and degreased, after which the adhesive is spray-applied at 12–18 μm dry film thickness with xylene dilution held at 0–4 wt%; the laminates are then dried at 60–80°C for 5–10 min before stacking. The key process conflict occurs at the laminate edge, because adhesive thickness above 20 μm creates a visible cement line that can act as an initiation point for edge peeling under cyclic compressive shear. Production lines therefore mask or wipe laminate borders with xylene before molding. The rubber and steel stack is cured in a compression press at 145–155°C under 10–15 MPa for 45–90 min depending on total bearing thickness; in-mold thermocouples track cure state because undercure leaves the rubber compound below its optimum crosslink density, while overcure at the adhesive interface degrades the resin. Compliance is verified to EN 1337-3:2005 for type approval, with bond testing according to ASTM D429-14 Method B or ISO 813:2019 on cut specimens; seismic isolators may also be tested under ISO 22762-1:2018 for shear properties and damping. Terminal products include plain laminated bridge bearings, pot bearing restraint pads, seismic isolation rubber bearings, and shear keys. A critical operational boundary is that adhesive film thickness must be uniform across the laminate: on lines using electrostatic bell sprayers, the wrap-around effect at the laminate edge causes local deposition differences and requires touch-up with a fine brush, but over-brushing introduces air micro-voids that reduce peel strength under low-temperature testing at −40°C.
Steel cord conveyor belts for mining and overland transport rely on a continuous adhesion layer between brass-plated or zinc-plated steel cords and the surrounding rubber compound; CS-964 is used in a dip or spray process at the cord entry to the calendering line. Open cord is preheated to 50–60°C and passed through a dip tank where the adhesive is held at 18–22 wt% solids and 0–5 wt% xylene dilution; vertical free-drip sections and air-knife controls reduce dry film thickness to 8–14 μm on the finished cord. The coated cord then travels through a continuous drying oven with zone temperatures of 60–80–100–90°C and an air velocity of 1.5–3.0 m/s, after which it is fed directly into the calender where cover rubber is applied under pressure. Adhesion performance is tested by the belt manufacturer according to ISO 7623-1:2015, which measures cord-to-rubber pull-out force; cord layout and belt construction follow ISO 15236-1:2016 for steel cord conveyor belts. The downstream final products include long-distance mining conveyor belts, overland coal transport belts, and high-tension bucket wheel excavator belts. The major production bottleneck is cord surface tension variation: brass-plated cords with residual drawing lubricant below 30 mN/m surface energy exhibit adhesive dewetting that appears only after the belt presses cure at 150–160°C for 30–60 min; therefore, cord cleaning before the dip bath must be validated by water-break-free inspection. Zinc-plated cords do not require an epoxy primer, but zinc salts from acid cleaning must not exceed 20 µS/cm in the final rinse, or the adhesive will gel locally in the dip tank.
Rubber expansion joints and flexible connectors are produced by coating polyester or nylon fabric plies with CS-964 before calendered rubber layers are applied and the bellows is cured on a mandrel. The adhesive is applied with a knife-over-roll coater at a wet film thickness of 30–50 μm, yielding 10–16 μm dry film on the fabric; dilution with toluene or xylene is adjusted within 0–6 wt% to maintain a smooth knife edge without streaking. The coated fabric passes through a forced-air drying tunnel at 60–80°C with a residence time of 2–4 min to remove solvent while retaining enough surface tack for the next rubber ply. The bellows lay-up is then built on a mandrel, wrapped with nylon tear tape, and cured in an autoclave at 140–150°C under 0.4–0.5 MPa for 60–120 min. Qualification of the cured assembly uses ASTM D429-14 Method B on fabric-to-rubber adhesion specimens, while the product’s pressure envelope is verified by hydrostatic test guidelines aligned with piping installation codes; published data for CS-964 in this specific bellows configuration is limited to supplier PPAP validation records, so each fabric lot must be re-qualified before production. Terminal products include pump inlet and discharge flexible connectors, flue gas expansion joints, cooling water rubber bellows, and chemical transfer spool connectors. The main operational boundary is tack retention: if the drying tunnel drops below 60°C or the line speed exceeds 8 m/min, solvent retention in the adhesive can cause delamination and gas blistering during autoclave cure; if the adhesive film is over-dried above 80°C for more than 10 min, surface tack is reduced and the next rubber ply will not consolidate. Amine-functional fabric sizing agents must be removed or neutralized before coating because they interfere with the phenolic cure of the adhesive.
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Rubber Adhesive CS-964 is a single-part, solvent-borne modified polychloroprene contact adhesive supplied under model designation CS-964. The product is formulated for bonding vulcanised rubber profiles, EPDM gaskets, nitrile sheeting, neoprene foam, and flexible SBR mouldings to degreased steel, aluminium, glass, powder-coated sections, and rigid PVC. The table below provides representative batch acceptance values measured on production lots.
| Property | Method | Representative value |
|---|---|---|
| Viscosity at 25 °C | ASTM D1084 | 1,400–2,000 mPa·s |
| Density at 20 °C | ASTM D1475 | 0.88–0.92 g/cm³ |
| Non-volatile content | ASTM D2369 | 31–34 % by weight |
| Closed-cup flash point | ASTM D56 | -4 °C |
| Open time at 23 °C and 50 % relative humidity | internal QC-SOP-114 | 6–10 min |
| Peel strength, EPDM canvas, 7-day cure | ISO 8510-2 | 5.0–5.8 N/mm |
| Tensile shear strength, neoprene-to-steel, 72 h cure | ASTM D1002 | 2.8–3.5 MPa |
Storage under nitrogen in sealed steel drums at 10–30 °C is recommended. In a 2,000 L stainless steel mixing vessel with anchor agitation at 45 rpm, batch-to-batch viscosity drift remained below 60 mPa·s after 6 months at 20 °C. Because the product is solvent-borne, the closed vessel should be grounded during transfer and the working area should maintain ventilation sufficient to keep average solvent exposure below applicable occupational exposure limits.
On zinc-phosphated steel and anodised aluminium, lap shear values at 72 h fell within 3.1–3.5 MPa when surfaces were degreased with isopropanol and dried for 10 min at 40 °C. On two-component polyurethane-coated profiles, bond performance depended on coating cure; fully crosslinked films with MEK double rub resistance above 100 cycles per ASTM D5402 produced consistent peel, whereas partially cured coatings caused adhesive film softening and reduced shear by 20–30 %.
At shear rates associated with air-assisted spray application, the formulation exhibits mild pseudoplasticity. Viscosity measured at 25 °C with a Brookfield LV spindle 3 at 12 rpm is 1,400–2,000 mPa·s, while at 60 rpm the apparent viscosity falls to 800–1,100 mPa·s. This shear-thinning response allows wet film formation without excessive misting when atomisation air is maintained between 2.0 bar and 3.0 bar. On airless spray systems with a 0.33 mm orifice, pressure below 3.5 MPa produced uneven fan patterns on cold substrates at 15 °C; preheating the adhesive to 25–28 °C restored uniform coverage.
Adhesion to un-primed EPDM depends less on bulk resin type than on surface contamination, plasticizer exudation, and mechanical anchorage. On extruded EPDM glazing profiles, abrasion with 180-grit alumina cloth followed by a 50:50 isopropanol–distilled water wipe raised 7-day peel strength to 5.0–5.4 N/mm when tested according to ISO 8510-2. Omission of abrasion produced peel values of 1.6–2.1 N/mm after the same cure period, and failure occurred primarily within the low-tack surface layer rather than in the adhesive film. This behaviour places CS-964 between conventional polychloroprene contact adhesives and moisture-curing polyurethane systems for untreated low-surface-energy rubber.
Open time on un-primed EPDM is 6–10 min at 23 °C and 50 % relative humidity when applied at 120 g/m² wet. At 70 % relative humidity, open time shortens by 40–50 %, and a conditioning tunnel or infrared pre-heat at 35 °C is required to maintain consistent contact bond. Conventional polychloroprene contact adhesives typically exhibit 15–25 min open time under identical conditions but show lower initial peel on EPDM; CS-964 trades a narrower application window for higher early grip on low-surface-energy rubber.
At a 600-mm-wide automated spray cell equipped with a 1.2 mm air-assisted spray valve, atomisation air at 2.8 bar and fluid pressure at 0.4 MPa produced continuous wet films when coat weight was maintained at 110–130 g/m² on neoprene sheet. Below 80 g/m², pinholing occurred on closed-cell neoprene foam; above 150 g/m², solvent entrapment created bubble defects after accelerated cure at 65 °C for 20 min. Assemblies were contact-bonded under 0.3 MPa platen pressure and held for 20 min at 40 °C, then conditioned for 72 h at 23 °C before destructive testing. These parameters define the working window for high-speed weatherstrip lamination and should be revalidated when line speed exceeds 12 m/min.
Green-strength development after contact bonding reached 0.4 MPa handling shear within 10 min on neoprene-to-steel test coupons. This property allows downstream trimming and mounting without additional fixturing. However, green strength is not a substitute for full cure; tensile shear after 72 h at 23 °C remains the release criterion in production lot testing.
Production lines using CS-964 in pressure-pot spray systems require daily cleaning of atomising heads with methyl ethyl ketone or a compatible aromatic/aliphatic solvent blend. Adhesive that cures in static passages at the nozzle seat can reduce orifice diameter by 0.05–0.08 mm during an 8-h shift; this drift shifts wet coat weight by 8–12 % and is detected by infrared film-weight monitors. Nozzle soak intervals of 20 min every 4 h were sufficient to maintain coat-weight variation below 5 % on a 300-part/hour glazing line.
Full cure of CS-964 follows solvent diffusion and resin coalescence rather than chemical crosslinking. At 23 °C, 72 h is required for final properties; at 65 °C, lap shear stabilises after 4 h, but post-cure at room temperature for an additional 24 h is used to eliminate solvent-retention artefacts. Forced hot-air cure above 80 °C is not recommended because film skinning may trap solvent and reduce peel strength by 15–20 %.
Bonded assemblies of 2 mm nitrile rubber to 304 stainless steel were prepared with a 120 g/m² single-coat application on both faces. After 72 h at 23 °C, reference tensile shear strength was 2.9–3.3 MPa per ASTM D1002. Thermal ageing in a forced-air oven at 100 °C for 1,000 h according to ASTM D573 produced strength retention of 71–78 %. Immersion in ASTM Reference Fuel C at 23 °C for 168 h produced retention of 82–87 %, while immersion in 20 % aqueous sodium hydroxide produced retention of 79–86 %. These values indicate that CS-964 is suitable for under-bonnet sealing applications where intermittent fuel splash and alkaline cleaning agents are present, but continuous immersion in aromatic process streams is not recommended.
Comparison with two-part reactive polyurethane adhesives of similar cured Shore A hardness shows that polyurethane systems typically retain higher shear after continuous fuel immersion and elevated-temperature creep, but they require 24–48 h to reach handling strength and are more sensitive to ambient moisture during metering. CS-964 provides more rapid fixturing at the expense of reduced chemical resistance after prolonged immersion.
Retained samples from each 1,000 kg production lot are stored in 250 mL sealed epoxy-lined steel containers at 40 °C for 14 days as an accelerated stability screen. Acceptance criteria for viscosity drift are ±150 mPa·s from initial, and peel strength on EPDM canvas must remain above 4.5 N/mm per ISO 8510-2. Settling is assessed after 24 h by measuring non-volatile content in the top and bottom thirds of the container; a difference greater than 2 percentage points triggers re-certification mixing at 45 rpm for 30 min. These controls reduce batch-to-batch variation on automotive weatherstrip lines where unplanned adhesive viscosity changes can alter bead width by 10–15 % at constant fluid pressure.
Direct substitution is limited to non-structural joints where sustained tensile shear stress remains below 1.5 MPa and continuous service temperature does not exceed 90 °C. CS-964 reaches 0.4 MPa handling shear within 10 min after contact bonding, whereas one-component moisture-curing polyurethane adhesives of similar cured flexibility frequently require 24–48 h to reach equivalent green strength. In production repair cells using hand-held pressure pots and air-atomised spray guns, this difference reduces rework queue time by approximately 18–22 h per shift.
The trade-off is environmental and mechanical. VOC content of CS-964 is 620–680 g/L by EPA Method 24, compared with <100 g/L for a typical one-component moisture-curing polyurethane. Bond-line elongation at break is 210–260 % per ASTM D412 for CS-964, which is lower than many polyurethane sealant films but sufficient for rubber-to-metal flexure. The following table summarises this substitution comparison.
| Attribute | CS-964 | Conventional polychloroprene contact adhesive | One-component moisture-curing polyurethane |
|---|---|---|---|
| Open time at 23 °C, 50 % RH | 6–10 min | 15–25 min | 60–120 min |
| Handling shear at 10 min | 0.4 MPa | 0.2 MPa | <0.1 MPa |
| Tensile shear strength, neoprene-steel, 72 h | 2.8–3.5 MPa (ASTM D1002) | 1.8–2.4 MPa (ASTM D1002) | 4.5–6.0 MPa (ASTM D1002) |
| VOC content | 620–680 g/L | 680–720 g/L | <100 g/L |
| Cured film elongation, ASTM D412 | 210–260 % | 300–380 % | 450–600 % |
CS-964 is not a direct replacement for two-part structural epoxies. Its filled film thickness of 0.15–0.30 mm accommodates rubber profile tolerances, but tensile lap shear remains below 3.5 MPa, whereas structural epoxy systems frequently exceed 10 MPa on degreased steel. The product should therefore be specified only for flexible non-structural bonds where vibration isolation, peel resistance, and rapid fixturing govern joint design.
Plasticizer migration from flexible PVC containing 30 phr dioctyl phthalate or more reduces peel strength on CS-964-bonded PVC/rubber assemblies by 35–45 % after 14 days at 60 °C, as measured by ISO 8510-2. For such substrates, a barrier primer or alternative structural adhesive should be qualified. Direct bonding to amine-catalysed polyurethane foam is not recommended because residual tertiary amine accelerators destabilize the chlorinated resin and can produce bond-line embrittlement within 72 h at 23 °C. Where polyurethane foam must be attached, a solvent-free reactive hot-melt interlayer has been used in production, but full validation data for CS-964 in this configuration is limited.
At relative humidity above 70 %, porous substrates such as neoprene foam and open-cell SBR should be pre-dried at 40 °C for 20–30 min before adhesive application. Application to damp surfaces decreases open time and can cause bubble formation during solvent flash-off. The cured film is resistant to incidental water contact but is not intended for permanent immersion in water above 50 °C.
At substrate temperatures below 10 °C, solvent evaporation slows and open time extends beyond 10 min; however, condensation risk on rubber surfaces increases. For cold-room assembly, substrate pre-warming to 15–20 °C is required. Above 35 °C, open time shortens below 3 min and continuous spray lines must reduce coating weight to 90–100 g/m² to avoid dry spray.
