Rubber to Metal Bonding Adhesive 821 Equivalent to Cilbond 80ET,55E
1. Application
821 is a heat vulcanization bonding adhesive as cover coat for
rubber and various metals.
2. Characteristics
- It is a high strength bonding adhesive for unvulcanized rubber and
metals coated with 813. The applicable rubbers include NR, CR, BR,
SBR, PIPR, IIR, EPR, EPDM.
- It is non-toxic, easily operated.
- It can be applied with different ways like dip coating, spraying,
brushing, and roller coating.
- It has excellent resistance to heating, water, solvent, oil, salt,
corrosion etc.
- It has high bonding strength, stability and long durability.
3. Physical Properties
Component | High polymer, organic compound, inorganic filler and organic
solvent |
Color | Black |
Viscosity | (25℃, Brookfield LV2 30rpm) 200-350cps |
Solid Content | 23-27% |
Flash Point | 27℃ |
Diluents | Xylene |
Solvent | Xylene |
Shelf life | 12 months in unopened containers (25℃) |
4. Applying 821
- Surface Preparation: All bonding surface must be contaminant (such
as oil, rust, oxide etc) free to reach optimum bonding effects.
Surfaces should be grit-blasted, and then ideally degreased. Apply
813 and wait it becomes dry.
- Mixing: Homogeneous mix must be ensured before applying bonding
agent.
- Dilution: Proper quantity dilutes can also be added according to
dosage. The diluted bonding agent cannot be stored for long time.
- Brushing: Unnecessary for dilution
- Roller coating: 100 portion of 821 with 10-15 portion diluents
- Dipping coating: 100 portion of 821 with 10-15 portion diluents
- Spraying: 100 portion of 821 with 50 portion diluents
- Coating thickness: The coating should be uniform. Drying coating
thickness is 15-25 microns.
- Drying: After applying 821, it should be left for 45-60minutes to
dry at room temperature. Pre-warming or heating will speed up
drying.
- Storage: It should be stored in dry environment at room
temperature. Avoid long time exposure in high humidity and
temperature environment.
- After treatment: Before heating vulcanization, use cloth strip
soaked with xylene to clean the excessive bonding agent. Once
cured, dilutes cannot clean the bonding agent.
- Vulcanization: For optimum adhesion effects, rubber and bonding
agent should be vulcanized at the same time. When the coated parts
are placed in the mould, fill rubber inside and then close the
mould to start vulcanization immediately. Recommended vulcanization
temperature is 145-185℃. Recommended vulcanization time is
5-60minutes. Vulcanization pressure is according to practical
situation.
5. Notes
- Close the diluents container tightly after use.
- The diluents vapor is hazardous. Prevent long time inhalation or
skin contact in working place.
6. Packing
3.5kg/drum; 18kg/drum