Santoprene 8191-55B100 TPV | 53A Bondable TPV for 2K Overmolding

描述

Santoprene 8191-55B100 is a soft, black, specialty thermoplastic vulcanizate from Celanese specifically formulated for bonding to engineering thermoplastics in hard/soft combination designs.

The material is particularly suited to applications where a soft elastomeric layer must be molded directly onto a harder thermoplastic substrate.

Typical compatible substrate families include:

• ABS
• PS
• PC
• PMMA
• ASA
• PET
• PPO/PS blends
• Selected PP constructions within the B100 family

Santoprene 8191-55B100 is therefore especially useful for:

• 2K / two-shot molding
• Cold-insert molding
• Soft-touch overmolding
• Hard/soft multi-material parts
• Coextruded bonded profiles

The grade combines approximately 53 Shore A hardness with 600% elongation at break, providing a soft elastomeric feel while maintaining useful toughness for flexible overmolded components.

It is also non-hygroscopic, which simplifies material handling compared with hygroscopic engineering plastics.

The B100 formulation is designed not only for adhesion but also for superior molded surface appearance, making the material especially relevant to visible soft-touch components such as grips, consumer electronics and automotive interior parts.

For more TPV products, visit our TPV Thermoplastic Vulcanizates Product Category →.

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Key Features of Santoprene 8191-55B100

Typical Applications for Santoprene 8191-55B100

Santoprene 8191-55B100 is especially useful where soft-touch feel and direct adhesion to a rigid engineering thermoplastic are required.

Typical Properties of Santoprene 8191-55B100

Physical Properties

The 55 in the grade designation should not automatically be treated as the current measured hardness. Published grade data gives approximately 53 Shore A.

Mechanical Properties

The very high 600% elongation is particularly useful in soft-touch overmolding where the elastomeric section may need to stretch or deform around a rigid structure.

Bonding to Engineering Thermoplastics

The defining feature of Santoprene 8191-55B100 is its ability to bond to selected rigid thermoplastics.

The grade is specifically formulated for adhesion to:

• PC
• ABS
• PS
• PMMA
• ASA
• PET
• PPO/PS blends

This makes it highly relevant to products requiring a combination of:

rigid structural substrate + soft elastomeric surface

Typical designs include:

• Hard plastic handle + soft grip
• Rigid housing + flexible sealing edge
• Rigid automotive component + elastomeric interface
• Hard consumer shell + tactile soft-touch zone

The B100 family is also positioned by Celanese for PP bonding, which broadens the possible hard/soft material combinations.

2K / Two-Shot Molding

One of the strongest application areas for Santoprene 8191-55B100 is two-shot molding.

In a typical process:

1. The rigid substrate is molded first.
2. The mold indexes or transfers.
3. Santoprene 8191-55B100 is injected onto the rigid substrate.
4. The second material forms a bonded soft-touch or sealing layer.

This process can help eliminate:

• Adhesives
• Mechanical clips
• Secondary assembly
• Separate bonding operations

Potential advantages include:

• Better part integration
• Reduced assembly steps
• Cleaner appearance
• Consistent soft-touch geometry
• Improved automation

Cold-Insert Molding

Santoprene 8191-55B100 can also be used for cold-insert molding.

In this process, a previously molded rigid thermoplastic component is inserted into the mold and the TPV is molded around or onto it.

Cold-insert molding can be useful when:

• The rigid substrate is produced separately
• Two-shot equipment is not available
• Complex inserts are required
• Different production locations are involved

Bond strength depends strongly on:

• Substrate resin formulation
• Substrate cleanliness
• Mold temperature
• TPV melt temperature
• Contact pressure
• Interface geometry
• Residence time

Final adhesion should therefore always be validated using the customer’s exact substrate grade.

Soft-Touch Performance

Santoprene 8191-55B100 is specifically designed for soft-touch applications.

At approximately 53 Shore A, it provides a comfortable elastomeric feel suitable for hand-contact components.

Potential applications include:

• Tool handles
• Kitchen utensils
• Sporting goods
• Appliance controls
• Consumer electronics
• Automotive grips

Soft-touch overmolding can provide:

• Improved grip
• Reduced slip
• Better tactile feel
• Impact cushioning
• Improved perceived product quality

Superior Surface Appearance

Celanese specifically positions the grade for applications requiring superior part surface appearance.

This is important in consumer-facing parts where the TPV is visible.

Potential appearance requirements include:

• Smooth surface
• Consistent gloss
• Uniform texture
• Low flow marks
• Good color consistency
• Defined transition between hard and soft materials

Tool design and processing conditions should be optimized to support both adhesion and surface quality.

Non-Hygroscopic Behavior

Santoprene 8191-55B100 is described as non-hygroscopic.

This means it does not absorb moisture from ambient air to the same degree as polymers such as:

• PA
• PET
• PBT

Routine drying is therefore less critical under proper storage conditions.

However, Celanese permits optional desiccant drying if necessary.

For this grade, a published optional drying condition is:

70°C for 3 hours

This can be used where pellets have been exposed to moisture or where consistent processing conditions are desired.

Processing Guidelines for Santoprene 8191-55B100

The current grade-specific processing methods include:

• Injection Molding
• Multi-Injection Molding
• Coextrusion

The material is also shear dependent, which is important when optimizing injection speed, gate dimensions and screw speed.

Optional Drying

Two-Shot Injection Molding Conditions

For 2K / two-shot molding, published grade-specific guidance is:

These conditions are particularly important because sufficient interface temperature can improve adhesion to the rigid substrate.

Insert Molding Conditions

For cold-insert molding, published guidance is:

The higher melt-temperature range helps promote wetting and adhesion to a relatively cold rigid insert.

Why Two-Shot & Insert Temperatures Differ

The difference in recommended temperature is logical.

In two-shot molding, the rigid substrate may still retain heat from the first molding cycle.

In cold-insert molding, the rigid component is often significantly cooler.

A higher TPV melt temperature can therefore help:

• Improve substrate wetting
• Increase interface temperature
• Promote adhesion
• Reduce premature cooling at the interface

Actual settings should be optimized around the substrate polymer and part geometry.

Shear-Dependent Flow

Santoprene 8191-55B100 is shear dependent.

As shear rate increases, apparent melt viscosity decreases.

This means flow can often be improved by optimizing:

• Injection speed
• Screw speed
• Gate dimensions
• Runner geometry

rather than simply raising melt temperature.

This behavior is especially useful for:

• Thin overmolded layers
• Narrow grip geometries
• Small sealing lips
• Detailed soft-touch features

Gate Design

For overmolding, gate position can strongly affect:

• Adhesion
• Surface appearance
• Flow orientation
• Weld-line location
• Filling pressure

The gate should encourage the TPV melt to flow across the substrate surface with sufficient pressure and temperature to promote bonding.

Sharp flow interruptions should be minimized where possible.

Interface Design

Mechanical design can complement chemical adhesion.

Useful interface features may include:

• Undercuts
• Through-holes
• Ribs
• Retention grooves
• Large bonded surface area

These features can improve overall part reliability, especially where the overmolded section experiences peeling loads.

Substrate Preparation

The rigid substrate should be:

• Clean
• Dry
• Free from oil
• Free from mold-release residue
• Free from dust
• Free from excessive surface contamination

Mold-release agents can significantly reduce bonding performance.

For critical parts, bonding should be validated using the exact production substrate rather than only the polymer family name.

Bonding Variability

Adhesion can vary significantly between different commercial grades of:

• PC
• ABS
• PC/ABS
• PS
• PMMA
• ASA
• PET

because individual resin formulations may contain:

• Lubricants
• Mold-release agents
• Impact modifiers
• Fillers
• Flame retardants
• UV stabilizers

Therefore, “bonds to PC” does not mean identical bond strength to every PC grade.

The customer’s exact resin should always be tested.

Agglomeration During Storage

Bonding grades such as Santoprene 8191-55B100 may occasionally agglomerate during shipping or storage because of the nature of the bonding formulation.

This does not automatically indicate material degradation.

Before feeding the material, processors should check:

• Pellet flow
• Hopper feeding
• Bridging
• Pellet clumping

Proper material handling can help maintain stable feeding.

Material Compatibility

Santoprene TPV is incompatible with:

• POM / Acetal
• PVC

The molding machine should therefore be thoroughly purged when switching between these materials and Santoprene 8191-55B100.

This is especially important for bonding applications where contamination may negatively affect:

• Adhesion
• Surface appearance
• Processing stability

Heat-Aging Performance

Published grade-specific heat-aging data includes:

These values can help engineers understand material-property retention after elevated-temperature exposure.

They should not be interpreted as universal continuous-use temperature ratings.

Chemical Resistance Data

Published grade testing also includes property retention after exposure to selected fluids.

Typical tested media include:

• 10% hydrochloric acid
• 50% sodium hydroxide
• 95% ethanol
• Water
• IRM 903 oil

The material shows relatively good property retention in water, acid and caustic exposure, while IRM 903 oil causes much larger mechanical-property changes.

For applications involving oil or aggressive fluids, exact compatibility should therefore be checked carefully.

Flammability

Published Santoprene 8191-55B100 data gives:

The grade should therefore be treated as an HB material, not as a flame-retardant V-0 TPV.

Why Choose Santoprene 8191-55B100?

The strongest reason to select Santoprene 8191-55B100 is its combination of soft-touch performance and direct adhesion to rigid engineering thermoplastics.

The grade provides:

• 53 Shore A hardness
• 1.04 g/cm³ density
• 600% elongation
• 4.1 MPa tensile stress at break
• 1.0 MPa stress at 100% elongation
• Excellent adhesion to selected engineering plastics
• 2K / two-shot molding capability
• Cold-insert molding capability
• Soft-touch feel
• Superior surface appearance
• Non-hygroscopic behavior
• Coextrusion capability
• Shear-dependent processing
• Black formulation

For manufacturers producing soft-touch grips, hard/soft automotive parts, consumer electronics, power tools or bonded sealing components, Santoprene 8191-55B100 is a highly relevant TPV grade.

Related Products

We supply Santoprene TPV grades for different bonding, hardness, overmolding and soft-touch requirements.

Typical product families include:

• Santoprene B100 bonding grades
• Santoprene bondable TPV
• Santoprene 2K molding grades
• Santoprene insert-molding grades
• Santoprene soft-touch grades
• Santoprene PC-bonding TPV
• Santoprene ABS-bonding TPV
• Santoprene PC/ABS overmolding TPV
• Santoprene automotive interior grades

View More TPV Thermoplastic Vulcanizates →

Technical Documents for Santoprene 8191-55B100

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FAQ About Santoprene 8191-55B100

Q1: What is Santoprene 8191-55B100?

Santoprene 8191-55B100 is a soft, black bondable TPV from Celanese designed for hard/soft overmolding and adhesion to selected engineering thermoplastics.

Q2: What is the hardness of Santoprene 8191-55B100?

The published typical value is approximately 53 Shore A.

Q3: Is 8191-55B100 exactly 55 Shore A?

The grade designation contains 55, but the published typical test value is approximately 53 Shore A.

Q4: What is the density?

The typical density is approximately 1.04 g/cm³.

Q5: What is the elongation at break?

The published typical value is approximately 600%.

Q6: What is the tensile strength?

The typical tensile stress at break is approximately 4.1 MPa.

Q7: What is the stress at 100% elongation?

The typical value is approximately 1.0 MPa.

Q8: What materials can Santoprene 8191-55B100 bond to?

It is specifically formulated for selected grades of ABS, PS, PC, PMMA, ASA, PET and PPO/PS blends.

Q9: Can Santoprene 8191-55B100 bond to PP?

The Celanese B100 family is also positioned for bonding to PP, but actual adhesion should be validated with the exact PP grade.

Q10: Is Santoprene 8191-55B100 suitable for 2K molding?

Yes. Two-shot / multi-injection molding is one of its main intended processing methods.

Q11: Can it be used for insert molding?

Yes. Cold-insert molding is a key application for this grade.

Q12: What two-shot molding temperature is recommended?

A published starting range is approximately:

210–230°C melt temperature and 30–50°C mold temperature.

Q13: What insert-molding temperature is recommended?

Published guidance recommends approximately:

230–250°C melt temperature and 25–50°C mold temperature.

Q14: Does Santoprene 8191-55B100 need drying?

It is non-hygroscopic, so routine drying is normally limited. Optional desiccant drying at approximately 70°C for 3 hours may be used if desired.

Q15: Is Santoprene 8191-55B100 suitable for soft-touch grips?

Yes. Soft-touch applications are one of the grade’s specifically stated design targets.

Q16: Is Santoprene 8191-55B100 flame retardant?

No. Published data gives UL 94 HB at 1.1 mm and 3.0 mm, so it should not be marketed as a V-0 flame-retardant grade.

Request Santoprene 8191-55B100 Price & Technical Support

For pricing, availability, bonding evaluation or technical documents for Santoprene 8191-55B100, please provide:

• Required quantity
• Destination country or port
• Substrate material
• Exact substrate grade
• PC / ABS / PC-ABS / PS / PMMA / ASA / PET / PP application
• Two-shot or insert-molding process
• Required Shore hardness
• Soft-touch requirement
• Bond-strength requirement
• Surface-appearance requirement
• Part dimensions
• Operating temperature
• Chemical-contact environment
• TDS / SDS requirement
• COA requirement
• Sample requirement, if applicable

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