Tech
Data
Kiss Cut
Storage
Temp
Range
Adhesive
Hardness
How to
Apply
Polyurethane - 4000 series
Bumper Material - Formulated polyurethane polymer containing no
plasticizer
Adhesive - Standard - high adhesion, rubber based pressure sensitive
"A" suffix - Acrylic based pressure sensitive
Hardness, Shore A 55 - 65
Ultimate Elongation *ASTM D-2249 140%
Tensile Strength *ASTM D-412 140 psi
Tear Strength *ASTM D-624 37 psi
Abrasion Resistance *ASTM C501-66 .14g/1000 cycles
Clear and light colored Urethane bumpers may exhibit some yellowing with exposure to UV light.
* Values are typical and not intended as specifications. Properties were tested on sheets of same material as bumpers. Values are from published data, and not directly verified by Dimension Molding.
PVC - 5000 series
Bumper Material - Modified PVC containing a plasticizer
Adhesive - Acrylic based pressure sensitive tape
Hardness, Shore A 55 - 65
Ultimate Elongation *ASTM D-744-49T 400% - 500%
Tensile Strength *ASTM D-412 1800-2200 psi
Tear Strength *ASTM D-624 200-260 psi
Dielectric Strength *ASTM D-1000 400 Volts/mil
Abrasion Resistance *ASTM C501-66 .14g/1000 cycles
Kinetic Coefficient of *ASTM D-1894-78
Friction (Mk) (Depend- Stainless Steel 1.6
ent on test surface) Glass 5.4
Formica 1.9
Wood with PU finish 5.2
Vinyl Floor Tile 1.8
Stain Resistance *7 Days at 150°F No Visible Stain
50% RH against
various surfaces
with 2 lb load
* Values are typical and not intended as specifications. Properties were tested on sheets of same material as bumpers. Values are from published data, and not directly verified by Dimension Molding.
Kiss Cut
Self-adhesive bumpers are produced in several layers as shown schematically below. The adhesive backing layer is sandwiched between the bumper material and the paper backing. The term "kiss cut" refers to the precision cutting of bumpers for easy removal from the backing. The cutter blade (orange) slices through the bumper material (purple) and adhesive layer (blue), but only kisses (does not cut through) the paper backing.
This allows the bumper and it's adhesive backing layer to be readily removed from the paper carrier so it can be applied to the end product.
Paper
Adhesive
Bumper
Cutter
Storage Recommendations
Polyurethane - 4000 series
Temperature: +40°F to 75°F (4°C to 24°C)
Humidity: 40% to 60% RH
Bumper adhesive may degrade if stored at temperatures and humidity higher than recommended ranges. If bumpers are stored at temperatures or humidity lower than recommended, allow bumpers to return to room temperature (72°F, 22°C) before applying.
Shelf life
One year, if stored at recommended conditions. Lighter color and clear bumpers may show some darkening or yellowing over time.
PVC - 5000 series
Temperature: +40°F to 75°F (4°C to 24°C)
Humidity: 40% to 60% RH
Bumper adhesive may degrade if stored at temperatures and humidity higher than recommended ranges. If bumpers are stored at temperatures or humidity lower than recommended, allow bumpers to return to room temperature (72°F, 22°C) before applying.
Shelf life
One year, if stored at recommended conditions.
Urethane
PVC
Storage Temperature
+40°F (4°C) to 75°F (24°C)
Storage Temperature
+40°F (4°C) to 75°F (24°C)
Application Temperature
+50°F (10°C) to 100°F (38°C)
Application Temperature
+50°F (10°C) to 100°F (38°C)
Service Temperature
-20°F (-29°C) to 140°F (60°C)
Service Temperature
-20°F (-29°C) to 140°F (60°C)
NOTE
Adhesives show reduced shear properties at elevated temperatures.
Intermittent Explosure
3 hours maximum
-30°F (-35°C) to 180°F (82°C)
There are two types of adhesives used in PADit bumper production. Each has its own strengths and weaknesses. Understand the differences to select the one most appropriate for each application.
Rubber Based Adhesive
Standard with Urethane Bumper Products
Not available on PVC products.∑
Acrylic Based Adhesive
Standard with PVC Bumper Products
Available on all Urethane products as an "A" suffix
There are several factors to consider when selecting an adhesive:
A. Type of material to which the bumper will be attached. If a product is coated (paint, powder coating, etc.), the bumper is attached to the coating rather than the base material.
B. Initial adhesion ("stickiness") - Rubber based adhesives have high initial adhesion (very sticky, like duct tape). Acrylic based adhesives have lower initial adhesion (like frosted office tape).
C. Cured adhesion - Acrylic adhesives have higher cured adhesion (holding power lasts longer), particularly with high surface energy materials like metals, glass, acrylic, or polycarbonate. Rubber based adhesives work well with lower surface energy materials like polyethylene, polypropylene, polystyrene, PVC, ABS, and nylon.
* Peel Adhesion (PSTC-3/180°F)
From stainless steel panels
Initial: 12 min dwell at room temp.
70 oz/in.
* Static Shear (PSTC-7 Mod./178°F)
Load: 4.4 psi (1/2"x1/2"x500g)
at room temp.
>240 minutes
* Peel Adhesion (PSTC-1 Mod./180°F)
From stainless steel panels
Initial: 20 min dwell at room temp.
34 oz/in.
* Static Shear (PSTC-7 Mod./178°F)
Load: 8.8 psi (1/2"x1/2"x1000g)
at room temp.
>1440 minutes
* Adhesion-to-Release (PSTC-4 Mod./135°F)
Liner: 92# ultra white
30 g/in.
Hardness
PADit product hardness is presented on the Shore A scale.
The Shore hardness test is measured with an apparatus known as a Durometer, so the test is also commonly called "Durometer hardness". The hardness value is determined by the penetration of a spring-loaded indenter into the sample. Because of the resilience of flexible materials such as Polyurethane and Flexible PVC, the hardness reading may change over time. If the indenter completely penetrates the sample, a reading of zero (0) is obtained. If no penetration occurs, the result is a reading of 100. These readings are dimensionless.
Principal of the Shore Test
1. The indenter is zeroed at Position A on the part surface.
2. The load is applied for 5 seconds, while the indenter moves to position B
3. The resulting Shore number represents the difference in depth between the zero position as a result of application of the load.
Indenter Cone Tip Force
Scale Diameter Angle Radius (lbf)
Shore A 0.050 35° 0.017 1.8
Shore D 0.050 30° 0.004 10.0
Hardness Test
Indenter
A
B
Test Specimen
Shore A
Shore D
Application
• Clean surfaces with low strength solvents such as ispropyl alcohol or heptane.
• Surfaces must be uniform, clean, and dry. They should be free of grease, wax, oil, dust, and other foreign material which might affect adhesion.
• Application temperature range is +50°F (10°C) to 100°F (38°C).
• Application force should be in the range of 3 lbf to 8 lbf. Application force should be applied for 3 to 5 seconds.
• Higher application force and application time is required for larger bumpers.
• After peeling bumper from paper backing, contamination of bumper adhesive with foreign materials should be avoided.
• Cure time of adhesive to mating surface is 24 hours minimum. The adhesive bond reaches maximum strength after 168 hours.
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The above data is believed to be accurate and reliable. Dimension Molding assumes no responsibility for end use applications, and no performance warranty is expressed or implied.