ARALDITE 1570FST

Main features

Aerospace Flame/Smoke/Toxicity Performance
Extended Working-Time Room-Temperature Cure
Structural Aircraft-Interior Bonding

Product Description

ARALDITE® 1570 FST A/B is a halogen-free, two-component epoxy paste adhesive for aerospace interior assemblies where flame, smoke and toxicity performance is required. The thixotropic system cures at room temperature and was developed for bonding PE foam to phenolic glass-reinforced plastic in aircraft cargo areas. It mixes at 1:1 by volume or 100:87.8 by weight, provides an approximately 140-minute pot life for a 100 g mass at 25°C, and reaches its recommended cure after 48 hours at 23°C. The mixed adhesive is dark grey and is available in 200 mL cartridges and bulk packaging. Huntsman lists the product for aircraft interiors, cargo liners and foam bonding, with FAR 25.853 and Airbus AIMS 10-04-006 references.

Key features

Flame, smoke and toxicity performance: Reported to meet FAR 25.853 (a), FAR 25.853 (a-1) and AITM 3.0005, with Airbus AIMS 10-04-006 referenced for the exact product.
Long working window with room-temperature cure: Approximately 140-minute pot life for a 100 g mass at 25°C and a recommended cure cycle of 48 hours at 23°C.
Thixotropic two-part paste: Dark-grey mixed adhesive with 1:1 volume mixing, controlled application and a recommended 0.05 to 0.10 mm bondline.

Applications / Suitable for

PE foam to phenolic GRP bonding in aircraft cargo areas
Aircraft interior and cargo liner assemblies requiring flame-retardant adhesive performance
Evaluation with foam, GRP, plastics and metal substrates in controlled aerospace bonding applications

TDS, SDS & Technical Documents

Technical Specifications

General Properties

Pot Life

140 minutes

Specific Gravity

1.3

Physical Properties

Viscosity (Part A)

175 mPa.s

Viscosity (Part B)

250 mPa.s

Additional Information

Technical properties

As-supplied adhesive properties

Values describe the separate components or mixed adhesive before cure. Pot life is condition-dependent and the listed value is not a guaranteed specification.

Property	Value	Unit	Method / condition
Adhesive type	Two-component epoxy paste	—	Halogen-free; thixotropic as supplied
Mixed color	Dark grey	—	Part A is black; Part B is white
Mixed density	1.2-1.4	g/cm³	Mixed adhesive
Mix ratio by weight	100:87.8	—	Part A : Part B
Mix ratio by volume	1:1	—	Part A : Part B
Pot life	Approx. 140	min	100 g mixed mass at 25°C
Recommended bondline	0.05-0.10	mm	Bondline range normally associated with greatest lap shear strength
Packaging	200 mL cartridges and bulk	—	Current Huntsman product listing

Processing

Surface preparation, mixing and cure

Prepare clean, dry joint surfaces and control the mixing, bondline and assembly sequence. The mixed paste may be applied manually or with automated dispensing equipment.

Surface preparation: Degrease the bonding surfaces to remove oil, grease and dirt. For the strongest and most durable joints, mechanically abrade or chemically etch the degreased surfaces, then degrease again.

Mixing: Combine Part A and Part B at 100:87.8 by weight or 1:1 by volume. Bulk and cartridge formats support manual or automated application.

Application and bondline: Apply the adhesive to pretreated, dry surfaces. A 0.05 to 0.10 mm adhesive layer is recommended for greatest lap shear strength under the referenced test guidance.

Assembly: Assemble and secure the joint components in a fixed position as soon as the adhesive has been applied. Joint design remains critical to bonded-joint durability.

Recommended cure: Cure for 48 hours at 23°C. Clean tools before adhesive residue cures.

Illustration of surface preparation, one-to-one volume mixing, adhesive application, clamping and room-temperature cure for ARALDITE 1570 FST A/B

Recommended workflow: prepare, mix, apply, assemble and cure under controlled conditions.

Storage and handling

Store Parts A and B in their original sealed containers at 2-8°C in a dry environment. Shelf life is 1 year under these conditions. Protect containers from moisture and direct heat, use appropriate ventilation and personal protective equipment, and consult the current regional Safety Data Sheets before use.

Technical properties

Typical cured mechanical and thermal properties

Typical cured and tested values under the stated substrate, cure and test conditions. These results are not universal design values or guaranteed specifications.

Property	Value	Unit	Method / condition
Lap shear strength at -55°C	18-23	MPa	Typical; ISO 4587; chromic-acid-etched Al 2024-T3; cure 48 h at 23°C; cohesive failure
Lap shear strength at 23°C	14-20	MPa	Typical; ISO 4587; chromic-acid-etched Al 2024-T3; cure 48 h at 23°C; cohesive failure
Lap shear strength at 80°C	3-6	MPa	Typical; ISO 4587; chromic-acid-etched Al 2024-T3; cure 48 h at 23°C; cohesive failure
Glass transition temperature	Approx. 60	°C	Typical; cure 48 h at 23°C
Burn length	42	mm	Typical; FAR 25.853 (a), vertical Bunsen burner, 60 s ignition; cure 4 h at 60°C; requirement 152 mm maximum
Flame time	0	s	Typical; FAR 25.853 (a); cure 4 h at 60°C; requirement 15 s maximum
Drip flame time	0	s	Typical; FAR 25.853 (a); cure 4 h at 60°C; requirement 3 s maximum
Specific optical smoke density	46	Ds	Typical; after 4 min; FAR 25.853 (a-1) / AITM 2.0007, flaming mode; cure 4 h at 60°C; limit 200

Flame, smoke and toxicity evidence

ARALDITE® 1570 FST A/B is listed with FAR 25.853 and Airbus AIMS 10-04-006 references. The following typical results were measured after a 4-hour cure at 60°C and should be interpreted within the stated test methods and limits.

Vertical flammability

Burn length was 42 mm against a 152 mm maximum requirement. Flame time and drip flame time were both 0 seconds against maximum requirements of 15 seconds and 3 seconds, respectively.

FAR 25.853 (a); vertical Bunsen burner test; 60-second ignition time.

Smoke density

Specific optical smoke density after 4 minutes was Ds = 46, compared with a maximum limit of 200.

FAR 25.853 (a-1) / AITM 2.0007; smoke density in flaming mode.

Toxicity screening

Reported gas concentrations were HCN 5 ppm, CO 90 ppm, NOx 7 ppm, SO2 + H2S 2 ppm, HF 0 ppm and HCl 0 ppm. Each result was below the corresponding stated requirement.

AITM 3.0005 / ABD 0031; stated limits: HCN 150, CO 1000, NOx 100, SO2 + H2S 100, HF 100 and HCl 150 ppm.

Next steps

Evaluate ARALDITE® 1570 FST A/B for your aerospace assembly

Discuss substrate preparation, dispensing format, bondline control and cure requirements for ARALDITE® 1570 FST A/B with Krayden. Our technical team can help review the intended aerospace assembly, operating conditions and documentation needs before qualification testing or production use.