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Description for 3M 235
Permanent semiflexibility, thermal shock and impact resistance, good electrical and adhesion properties.Application Type Casting 1 Part or 2 Part 2-Part Material Form Photographic Tape Substrate Metal, steel Industry General purpose camera applications, Repairing camera bellows. Manufacturer 3M Chemistry Rubber Cure Method Oven-curing Color Black High Temperature Resistance (°C) Thermal Shock Resistance Density (g/cm³) 1.150, 1.020 -
Technical Data for 3M 235
Overview
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Application Type
- Casting / Moldmaking - Casting
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1 Part or 2 Part
- 2-Part
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Material Form
- Tape - Photographic Tape
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Industry
- Cameras - General purpose camera applications, Repairing camera bellows.
- Industrial
- Other - Masking out unwanted portions of negatives., Sealing film envelopes and metal film containers
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Chemistry
- Other - Rubber
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Cure Method
- Heat - Oven-curing
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Color
- Black
Specifications
Bond Strength
General Bond Strength (psi) 23 (oz./in.) Test Method Compressive Strength (psi) 1,300 Test Method Flexural Strength (psi) 3,200 Test Method Tensile Strength (psi) 1,300, 22 (lbs./in.) Test Method Material Resistance
High Temperature Resistance (°C) Thermal Shock Resistance Impact Resistance Impact Resistance Conductivity
Dielectric Strength (V/mil) Good Hardness
Elongation (%) 9 Test Method Flexibility Permanent semiflexibility Other Properties
Specific Gravity 1.100 Test Method Coefficient of Thermal Expansion (CTE) 16e-5 (length/unit length/°C) Test Method Flash Point (°F) 401.0, 350.6 Density (g/cm³) 1.150, 1.020 Business Information
Shelf Life Details Storage: Both parts of this resin system should be stored at temperatures between 20 to 30 degrees Celsius, and 30% to 60% relative humidity. When not in use, containers should be kept tightly closed. Storage at conditions outside those suggested may compromise the performance of the resin. Shelf Life Temperature (°F) 68 to 86 Not Good For
Don't Use For Not recommended for outdoor applications -
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Best Practices for 3M 235
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Application
Pour the warm resin into the preheated 100ºC mold. If no mold is used, dip the preheated part into the resin. Heating the resin and mold aids impregnation. For maximum impregnation, evacuate for 5 to 15 minutes at 5 mm of mercury (Hg) absolute pressure, or pour under vacuum and hold for several minutes before releasing.
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Mixing
Mix the separate parts before removing them from their containers. They may be warmed to 60ºC (140ºF) to aid mixing. Weigh the correct proportions of the separate parts to within 2% accuracy and combine them. Thoroughly blend the mixture until the color is absolutely uniform or a homogeneous mixture is obtained.
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Curing
Where minimum stress and maximum thermal shock resistance are required, the lower temperature cure cycle is recommended. (See “Curing Guide” of Handling Properties section). Time should be added to the cure cycle to allow the resin to reach the curing temperature.
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Tensile Strength Test Methods
| Tensile Strength | Test Method |
|---|---|
| 1,300 psi | Fed. Std. No. 406, Method 1011, 1/8" x 1/2" Sample |
| 22 (lbs./in.) | ASTM D-3759, at Break, width |
Compressive Strength Test Methods
| Compressive Strength | Test Method |
|---|---|
| 1,300 psi | Fed. Std. No. 406, Method 1021, 10% Compression |
Flexural Strength Test Methods
| Flexural Strength | Test Method |
|---|---|
| 3,200 psi | Fed. Std. No. 406, Method 1031, (1/2" x 1/2" Sample) |
General Bond Strength Test Methods
| General Bond Strength | Substrate | Test Method |
|---|---|---|
| 23 (oz./in.) | Steel | ASTM D-3330, width |
Elongation Test Methods
| Elongation | Test Method |
|---|---|
| 9 % | D-3759 (at Break) |
Coefficient of Thermal Expansion (CTE) Test Methods
| Coefficient of Thermal Expansion (CTE) | CTE Temperature (°C) | CTE Test Method |
|---|---|---|
| 16e-5 (length/unit length/°C) | 23 to 113°C | MIL-I-16923E, Linear |
Specific Gravity Test Methods
| Specific Gravity | Test Method |
|---|---|
| 1.100 | Cured |
