Adsyl 5C33F Calcium Stearate Free Sealant for BOPP Metallized Film

BOPP film producers face a persistent trade-off: lower seal initiation temperatures improve line speed and reduce energy consumption, but they often come at the cost of optical clarity or metallized layer adhesion. The challenge intensifies when the end application involves food-contact packaging or high-gloss label films, where surface defects and additive migration cannot be tolerated. Adsyl 5C33F is a Catalloy-process terpolymer from LyondellBasell designed specifically to address this balance. It combines a 105°C seal initiation temperature with 0.6% haze and 88% gloss at 45°, while remaining free of slip additives, anti-block additives, and calcium stearate. In our experience supplying film processors across Asia-Pacific, grades with this additive profile are increasingly specified for metallized BOPP structures where aluminum adhesion consistency matters as much as seal strength.

Product Specifications

The following typical values are drawn from LyondellBasell's public Technical Data Sheet.

Property	Typical Value	Unit	Test Method
Melt Flow Rate (230°C/2.16 kg)	5.5	g/10 min	ISO 1133
Density (23°C, Method A)	0.90	g/cm³	ISO 1183-1
Seal Initiation Temperature (30 µm film)	105	°C	LYB Method
Vicat Softening Temperature (A50)	111	°C	ISO 306
Melting Temperature	132	°C	ISO 11357-3
Haze (50 µm film)	0.6	%	ASTM D1003
Gloss (45°, 50 µm film)	88	%	ASTM D2457
Film Tensile Strength at Yield, MD (50 µm)	14.0	MPa	ISO 527-3
Tensile Strength at Yield (compression molded)	21.4	MPa	ASTM D638
Tensile Elongation at Yield	13	%	ASTM D638

Note: Film properties measured on 50 µm cast film unless otherwise stated. Compression molded tensile data per ASTM D638 provided for reference. Values are typical and not specification limits. Processors should verify performance under their own conditions.

Key Properties

Low seal initiation at 105°C. Lower sealing temperatures allow BOPP lines to run at reduced thermal input, which one film processor reported translated into measurable energy savings without sacrificing seal integrity.
High optical clarity. With 0.6% haze and 88% gloss, this grade produces films suitable for transparent food packaging and high-visibility label applications where surface quality is a purchase criterion.
Calcium stearate free. Unlike many sealant grades that include calcium stearate as a processing aid, Adsyl 5C33F omits this component. This reduces the risk of additive migration to the film surface, a factor that can interfere with aluminum adhesion in metallized structures.
No slip or anti-block additives. The neat resin form gives converters full control over their additive package, avoiding incompatible slip systems that can cause delamination or adhesion loss in downstream converting steps.
Broad process window. Qualified for BOPP, cast film, and double bubble extrusion, allowing the same grade to be used across multiple film lines without requalification.

Adsyl 5C33F vs. 5C30F: Key Differences

Both grades belong to the Adsyl Catalloy family and share nearly identical physical property profiles. The distinction lies in additive formulation.

Item	Adsyl 5C33F	Adsyl 5C30F
Melt Flow Rate (230°C/2.16 kg)	5.5 g/10 min	5.5 g/10 min
Density	0.90 g/cm³	0.90 g/cm³
Seal Initiation Temperature	105°C	105°C
Vicat Softening Temperature	111°C	111°C
Melting Temperature	132°C	132°C
Haze (50 µm)	0.6%	0.6%
Gloss (45°)	88%	88%
Slip / Anti-block Additives	None	None
Calcium Stearate	Explicitly free	Not stated in TDS

The practical difference: Adsyl 5C33F carries an explicit “Calcium Stearate free” declaration in its TDS, while 5C30F does not. For metallized film applications, where calcium stearate migration can create a weak boundary layer and affect aluminum adhesion, this distinction may influence grade selection. However, actual metallization performance depends on corona treatment, deposition parameters, and film surface cleanliness. We recommend line-specific validation rather than relying on formulation claims alone. If a single grade is needed across both metallized and standard sealant layers, 5C33F simplifies inventory management. If the application does not involve metallization or stringent food-contact review, 5C30F may offer a cost advantage.

Applications

Metallized label film. A label film processor switched to Adsyl 5C33F for the sealant layer of a metallized BOPP structure, citing the calcium stearate free formulation as a factor in reducing adhesion variability during aluminum deposition. Results were validated on their specific line before full adoption.

Food packaging film. A food packaging manufacturer used this grade in a three-layer BOPP coextrusion for a high-clarity snack packaging structure. By lowering the heat seal temperature by approximately 10°C, they maintained seal strength while improving line throughput and reducing thermal energy input.

Shrink and lamination film. In double bubble shrink film and dry lamination sealant layers, the grade's high hot tack strength and broad operating window have shown consistent performance across production runs.

Adsyl 5C33F terpolymer sealant and metallized layer structure for BOPP film

Supply Chain and Logistics

Qingdao Prime Union Trade Co., Ltd. has supplied engineering thermoplastics for over two decades and holds authorized distributor relationships with Chimei, SABIC, Hanwha Total, and Hyosung, alongside direct supply channels with Mitsubishi, Rohm, Double Elephant, and LG. The company operates four owned warehouses across China, supporting general trade, processing trade, and bonded warehouse transactions. Adsyl 5C33F is maintained as an in-stock grade. For buyers sourcing other polyolefin film grades or engineering resins from our portfolio, consolidated shipments from bonded inventory can reduce logistics complexity.

Qingdao Primetech Plastics Co., Ltd., our sister compounding operation, provides modification and coloring services across PC, ABS, PP, PA, PBT, PPS, PPA, and PETG. Standard color matches and basic modifications carry a 3-day sample lead time and 7-day production lead time. Samples are fee-based, with the sample cost credited toward the first full order.

Chinese polymer modification plant of Qingdao Primetech Plastics

Frequently Asked Questions

Q: What certifications does Adsyl 5C33F hold for food-contact applications?

A: This grade complies with FDA 21 CFR 177.1520 for food-contact applications, EU 10/2011/EC for plastic materials intended to contact food, and EU 1935/2004/EC framework regulation. It also meets RoHS directive 2011/65/EU and EU Packaging and Packaging Waste 94/62/EC requirements. Compliance documentation including MSDS and regulatory statements is available upon request.

Q: Is Adsyl 5C33F suitable for metallized BOPP film?

A: Yes. The grade is specifically designed for sealing or metallized layer applications in coextruded films. Its calcium stearate free formulation reduces the risk of additive migration that can interfere with aluminum adhesion. However, metallization performance is also influenced by corona treatment and deposition conditions, so we recommend line-specific validation.

Q: What is the difference between Adsyl 5C33F and Adsyl 5C30F?

A: The two grades share identical melt flow, density, seal initiation temperature, melting point, haze, and gloss values. The key difference is that 5C33F is explicitly declared calcium stearate free in its TDS, while 5C30F's public TDS does not carry this declaration. For metallized film or strict food-contact review, 5C33F provides a clearer compliance pathway.

Q: Can I get a sample of Adsyl 5C33F for production trials?

A: Samples are fee-based, with the sample cost credited toward the first full order. Please specify your film structure and target application so we can confirm grade suitability and provide relevant processing guidance.

Q: Does Qingdao Prime Union support bonded warehouse trade for this grade?

A: Yes. We support general trade, processing trade with manual documentation, and bonded warehouse transactions. Adsyl 5C33F is held in stock across our warehouse network, and bonded inventory can be arranged for re-export or deferred duty purposes. Contact our team to confirm current availability and documentation requirements.

Conclusion

Adsyl 5C33F delivers a 105°C seal initiation temperature and 0.6% haze in a calcium stearate free, additive-free terpolymer form, giving BOPP film producers a grade that supports both high-speed sealing and consistent metallized layer performance.