Soft Clear Doming Epoxy Resin for Stickers and Flexible Substrates｜E-1155 / H-1155

Fong Yong Chemical Co., Ltd. is one of the leading manufacturers and suppliers of soft clear doming epoxy resin for stickers and flexible substrates｜e-1155 / h-1155 in Taiwan. With abundant experience, we warmly welcome you to buy high quality customized products at competitive price from our factory. If you have any enquiry about quotation, please feel free to email us.

 

E-1155/H-1155 is a two-component, solvent-free clear epoxy resin developed for doming applications on stickers, labels, and flexible substrates where cured flexibility and deformation tolerance are prioritized over rigid surface hardness - including varnished paper, plastic films, and aluminum films. Formulated for applications where a soft, flexible dome is the primary selection criterion, the system delivers Shore A 45–85 hardness (3:1 or 4:1 mix ratio dependent), up to 210% elongation, and a smooth, colorless high-gloss surface with room-temperature or 80°C accelerated cure.

 

Key Takeaways

• Cured dome hardness is mix-ratio dependent: Shore A 75–85 (3:1) or Shore A 45–55 (4:1) - ratio selection is a material decision based on the flexibility and tactile requirements of the application substrate. Confirm the required hardness profile before mixing.
• Elongation up to 210% (4:1 ratio) - the cured film stretches without fracture under flexion, making it compatible with labels and stickers applied to curved or flexible surfaces. At 3:1 ratio, elongation is 128% with higher abrasion resistance.
• Viscosity 600–2,000 cps (E-1155, 25°C) / 10–150 cps (H-1155) - low viscosity supports smooth self-leveling dome formation. Pot life is 60 minutes at 25°C for a 60 g mix mass.
• No UV stabilizers - E-1155/H-1155 is not formulated for UV resistance - for applications requiring UV stability or outdoor use, a UV-rated doming system should be evaluated separately.

 

Why Dome Softness Is a Material Selection Decision, Not a Processing Variable

Figure 1. Mix ratio selection determines the full mechanical profile of the cured dome. 3:1 ratio: Shore A 75–85, 128% elongation - higher abrasion resistance for flat substrates. 4:1 ratio: Shore A 45–55, 210% elongation - softer, more flexible, suited to curved or flexible applications.

 

In doming applications, the mechanical behavior of the cured layer determines whether the dome maintains integrity through the service conditions of the application - not just at the time of cure. A dome on a flat, rigid substrate has different requirements than one on a label that will be handled, flexed, or applied around a curved surface. A dome that is too hard for the substrate's deformation range will delaminate or crack under flexion - not at the point of application, but in service. The selection decision therefore starts from the substrate mechanics: Shore A 45–55 (4:1 ratio) for high-flexibility applications where elongation is the priority; Shore A 75–85 (3:1 ratio) for flat applications where abrasion resistance takes precedence. This ratio is locked at mixing - it cannot be adjusted after the material is combined.

 

Softness is not selected because flexibility is better. It is selected because some substrates continue to deform after application. Dome performance is determined not only by appearance at cure, but also by how the cured layer responds to bending, handling, and substrate movement during service.

 

Applications

Flexible Transparent Dome on Stickers and Labels

E-1155/H-1155 is suited for transparent doming on paper, PET, and vinyl-based stickers and printed labels where a clear, glossy dome profile and flexible cured surface are required. Its low viscosity (600–2,000 cps at 25°C) supports smooth self-leveling without manual spreading. At 4:1 mix ratio, the cured dome delivers Shore A 45–55 hardness and 210% elongation - compatible with labels applied to curved or flexible surfaces. At 3:1 ratio, Shore A 75–85 and 128% elongation provide higher abrasion resistance for flat, handled surfaces. Pot life is 60 minutes at 25°C, accommodating small-to-medium batch operations. Applications are intended for indoor service; specific substrate adhesion and exposure conditions should be confirmed before production use.

Figure 2. Doming sequence: mix E-1155 and H-1155 at selected ratio → apply to label within 60-minute pot life → allow to self-level and cure. Low viscosity ensures smooth dome profile without manual spreading.

 

Soft Dome for Curved Decorative Surfaces

For curved decorative surfaces and flexible graphic applications - including plastic films, laminate overlays, and soft-touch decorative layers - E-1155/H-1155 forms a clear, smooth, high-gloss dome while accommodating minor substrate movement after application. Specific substrate adhesion compatibility should be confirmed for the substrate formulation and surface treatment before production use.

 

Elastic Overlay for Metallic Labels

E-1155/H-1155 adheres to aluminum films and metallic label substrates while maintaining dome continuity under minor substrate deformation. Its low water absorption (0.12–0.18% at 25°C over 24 hours, ratio dependent) supports performance in environments with occasional moisture exposure. Applications are intended for the substrate types confirmed in TDS; adhesion and service performance for specific substrate conditions and geometries should be verified before production use.

 

Selection Notes

Use these notes to determine whether E-1155/H-1155 is appropriate for evaluation for your application.

• Soft, flexible dome on sticker or label substrate - E-1155/H-1155 may be evaluated. Select mix ratio based on the required hardness and elongation profile for the application.
• Fast cure required for production throughput - E-1158-2/H-1158-2 is developed specifically for high-throughput doming with accelerated cure and should be evaluated separately. E-1155/H-1155 gel time at room temperature is 8–24 hours.
• Outdoor or UV-exposed doming applications - EU-118S-5S/HU-118S-5S is developed for outdoor service with PU chemistry and should be evaluated separately. E-1155/H-1155 is positioned for indoor service conditions.
• Anti-yellowing indoor coating on leather, wood, bamboo, or mixed-material decorative objects - E-1188TT/H-1188TT is developed for natural material coating with Shore A 75 flexibility and anti-yellowing performance and should be evaluated for these applications.
• Rigid surface performance required (Shore D hardness) - a higher-hardness epoxy system should be evaluated separately. E-1155/H-1155 cures to Shore A range only.

 

Figure 3. Application boundary guide for E-1155/H-1155: primary use (soft flexible doming on indoor stickers and labels) and situations requiring evaluation of a different system (fast cure, UV resistance, outdoor service, hard coating).

 

Frequently Asked Questions

Q: What is the practical difference between mixing at 3:1 and 4:1 ratio?

A: Ratio selection determines two independent material properties simultaneously: hardness and elongation. At 3:1 by weight, the cured material reaches Shore A 75–85 with 128% elongation - higher surface resistance, less stretch. At 4:1, Shore A 45–55 with 210% elongation - softer, more flexible, suited to curved or high-deformation applications. Water absorption and tensile strength also differ between the two ratios. The ratio should be selected based on the mechanical requirements of the application before mixing, as it cannot be modified after the material is combined.

 

Q: Can E-1155/H-1155 be used for outdoor or UV-exposed applications?

A: E-1155/H-1155 is not formulated with UV stabilizers. Outdoor suitability has not been validated as part of this product's intended use. For applications with direct UV exposure, prolonged sunlight, or outdoor weather conditions, a UV-stabilized or outdoor-rated doming resin system should be evaluated separately.

 

Q: What substrates is E-1155/H-1155 compatible with?

A: TDS indicates successful application on varnished paper, plastic films, and aluminum films - the substrate categories for which this product was originally developed. Adhesion to specific substrate formulations, surface treatments, and geometries outside the tested configurations depends on application conditions, and compatibility should be confirmed before production use.

 

Q: Does the cure schedule (RT vs. 80°C) affect the final dome appearance?

A: Cure conditions including temperature, mass, and application thickness may influence the final state of the cured film. Pot life, gel time, and full cure time vary with ambient temperature and mix mass. The cure schedule should be verified against the specific application geometry and environment before committing to production conditions.

 

If your application involves flexible doming or curved label surfaces, 🔗share the substrate type and expected movement after application for evaluation, sample discussion, or quotation support.

 

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Property	Value
Appearance - E-1155 (Part A)	Clear liquid
Appearance - H-1155 (Part B / Hardener)	Clear liquid
Viscosity at 25°C - E-1155 (Part A)	600 – 2,000 cps
Viscosity at 25°C - H-1155 (Part B)	10 – 150 cps
Mix Ratio (by weight)	3:1 or 4:1 (E-1155 : H-1155)
Pot Life (60 g, 25°C)	60 minutes
Gel Time (Initial Cure)	RT: 8–24 hrs | 80°C: 60 min
Full Cure Time	RT: 7 days | 80°C: 3 hrs
Hardness (Shore A) - 3:1 ratio	75 – 85
Hardness (Shore A) - 4:1 ratio	45 – 55
Water Absorption (25°C, 24 hrs) - 3:1 ratio	0.12%
Water Absorption (25°C, 24 hrs) - 4:1 ratio	0.18%
Solvent Content	Solvent-free
Typical Substrate Applications	Varnished paper, plastic films, aluminum films

All values from TDS (Rev. 2021/05/28). Properties including hardness, tensile strength, elongation, and water absorption are mix-ratio dependent - values listed separately for 3:1 and 4:1 ratios. Pot life, gel time, and cure time are reference values measured at specified conditions and vary with ambient temperature, mix mass, and application thickness. Reference application temperature is valid for correctly mixed, fully cured material under accurate operating conditions. Verify performance under your specific application conditions before production use.