Sikaflex®-1A
Elastomeric joint sealant / adhesive
Sikaflex®-1A is a premium-grade, high-performance, moisture-cured, 1-component, polyurethane-based, non-sag elastomeric sealant. Meets ASTM C-920,Type S, Grade NS, Class 35, use T,NT,O,M,G,I,A.
- 1-part no mixing equipment required
- Fast tack-free and final cure times
- High elasticity and flexibility
- Good cut and tear resistance
- Low stress on substrate
- Good adhesion to many construction materials
- Primerless for most substrates and applications
- Resistant to weathering and ageing
- Suitable for use in most global conditions.
- Low VOC emissions
- Resistant to jet fuel exposure
- Certified to the NSF/ANSI Standard 61 for potable water
- Urethane-based, suggested by EPA for radon reduction
- Over-paintable with oil and rubber based paints
- Movement capability ± 35 % (ASTM C 719)
Usage
- Designed for all types of joints.
- Used extensively in both civil engineering and building construction for sealing.
- Excellent for small joints and fillets,windows,door frames,reglets,flashing,common roofing detail applications, and many construction adhesive applications.
- Suitable for vertical and horizontal joints.
- Has many applications as an elastic adhesive between materials with dissimilar coefficients of exapansion.
- Submerged conditions, such as canal and drinking water reservoirs.
Advantages
- 1-part no mixing equipment required
- Fast tack-free and final cure times
- High elasticity and flexibility
- Good cut and tear resistance
- Low stress on substrate
- Good adhesion to many construction materials
- Primerless for most substrates and applications
- Resistant to weathering and ageing
- Suitable for use in most global conditions.
- Low VOC emissions
- Resistant to jet fuel exposure
- Certified to the NSF/ANSI Standard 61 for potable water
- Urethane-based, suggested by EPA for radon reduction
- Over-paintable with oil and rubber based paints
- Movement capability ± 35 % (ASTM C 719)
Packaging
600 ml foil pack, 20 foil packs per box
Colour
Aluminum gray, white
Product Details
APPROVALS / CERTIFICATES
- ASTM C920, Type S, Grade NS, Class 35, use NT,A,M
- Federal specification TT-S-00230 C Type II, Class A
- Canadian Standard CANICGSB 19.13-M87
- Certified to NSF/ANSI standard 61 for potable water
- Certified from National Authority for drinking and sanitary water.
Composition
Polyurethane
Shelf life
12 months from date of production
Storage conditions
The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +25 °C. Always refer to packaging.
Density
| ~1,45 kg/l | (ISO 1183-1) |
Shore A hardness
| ~40 (after 21 days) | (ASTM C 661) |
| ~40 (after 28 days) | (ISO 868) |
Tensile stress at specified elongation
| 25 % | ~35 psi (0,24 N/mm2) |
| 50 % | ~60 psi (0,41 N/mm2) |
| 100 % | ~85 psi (0,59 N/mm2) |
Secant tensile modulus
| ~0,55 N/mm2 (80 psi) at 60 % elongation (23 °C) | (ISO 8339) |
| ~0,90 N/mm2 (131 psi) at 60 % elongation (−20 °C) |
Movement capability
| ±35 % | (ASTM C 719) |
| ±25 % | (ISO 9047) |
Adhesion in peel
| Substrate | Peel Strength | Adhesion loss |
| Concrete | ~20 lbs (~9 kg) | 0 % |
| Aluminium | ~20 lbs (~9 kg) | 0 % |
| Glass | ~20 lbs (~9 kg) | 0 % |
Elastic recovery
| ~90 % | (ISO 7389) |
Tear strength
| ~55 lbs./in. (~10 N/ mm) | (ASTM D 624) |
Service temperature
−40 °F to +170 °F (−40 °C to +77 °C)
Chemical resistance
Resistant to many chemicals. Contact Sika Technical Services for additional information
Resistance to weathering
| 0 (no cracks) | (ASTM C 793) |
Application
Ambient air temperature
+4 °C to +38 °C
Substrate temperature
+4 °C to +38 °C. Min. 3 °C above dew point temperature
Sealants must be installed when substrates are at mid-range of their anticipated movement.
Backing material
Use closed cell, polyethylene foam backing rods.
Skinning time
| ~160 minutes (23 °C / 50 % r.h.) | (CQP 019-1) |
Tack free time
| ~160 minutes (23 °C / 50 % r.h.) | (ASTM C 679) |
Consumption
| Joint width mm | Joint depth mm | Joint length m per sausage (600 ml) |
| 10 | 10 | 6 |
| 15 | 10 | 4 |
| 20 | 10 | 3 |
| 25 | 12 | 2 |
| 30 | 15 | 1,3 |
Consumption depends on the roughness and absorbency of the substrate.
These figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level or wastage etc.
SUBSTRATE PREPARATION
The substrate must be sound, clean, dry and free of all contaminants such as dirt, oil, grease, cement laitance, old sealants and poorly bonded paint coatings which could affect adhesion of the sealant. The substrate must be of sufficient strength to resist the stresses induced by the sealant during movement.
Removal techniques such as wire brushing, grinding, grit blasting or other suitable mechanical tools can be used.
Repair all damaged joint edges with suitable Sika repair products
New or refurbished joints must be saw-cut.
Where joints in substrate are saw cut. After sawing, all slurry material, must be flushed away and joint surfaces allowed to dry.
All dust, loose and friable material must be completely removed from all surfaces before application of any activators, primers or sealant.
Sikaflex®-1A adheres without primers and/or activators.
For optimum adhesion, joint durability and critical, high performance applications such as joints on multi-storey buildings, highly stressed joints, extreme weather exposure or water immersion / exposure. The following priming and/or pre-treatment procedures must be followed:
Non-porous substrates
Aluminium, anodised aluminium, stainless steel, PVC, galvanised steel, powder coated metals or glazed tiles. Slightly roughen surface with a fine abrasive pad. Clean and pre-treat using Sika® Aktivator-205 applied with a clean cloth.
Before sealing, allow a waiting time of > 15 minutes (< 6 hours).
Other metals, such as copper, brass and titanium-zinc, cleaned and pre-treat using Sika® Aktivator-205 applied with a clean cloth. After a waiting time of > 15 minutes (< 6 hours). Apply Sika® Primer-3 N applied by brush. Before sealing, allow a waiting time of > 30 minutes (< 8 hours)
PVC has to be cleaned and pre-treated using Sika® Primer-215 applied with a brush. Before sealing, allow a waiting time of > 30 minutes (< 8 hours).
Porous substrates
Concrete, aerated concrete and cement based renders, mortars and bricks must be primed using Sika® Primer-3 N applied with a brush. Before sealing, allow a waiting time of > 30 minutes (< 8 hours).
Adhesion tests on project specific substrates must be performed and procedures agreed with all parties before full project application. Contact Sika Technical Services for additional information.
Note: Primers and activators are adhesion promoters and not an alternative to improve poor preparation / cleaning of the joint surface. Primers also improve the long term adhesion performance of the sealed joint.
MIXING
1-part ready to use
CLEANING OF EQUIPMENT
Clean all tools and application equipment with Sika® Remover-208 immediately after use. Hardened material can only be removed mechanically.
For cleaning skin use Sika® Cleaning Wipes-100.