SILCOR® Primer PU 30
Single component, solvent free polyurethane primer for use with SILCOR® liquid waterproof membranes applied to bitumen sheets.
Product Description
SILCOR® Primer PU 30 is a single component polyurethane primer, formulated specifically to optimise performance of Silcor liquid waterproof membranes applied to bitumen sheets.
Principal Applications
Primer for existing bitumen sheet roofs, prior to the application of Silcor elastomeric waterproof membranes.
System Components
1. Surface preparation
Only use Silcor Primer PU 30 on bitumen substrates. For concrete substrates, use Silcor Primer EPF.
All surfaces must be dry, clean, sound, free of dust, grease and any other contaminants that might affect adhesion.
Bitumen felts should be checked carefully. If the surface defects (cracks, blisters, poorly bonded laps, etc.) are less than 15% of the total surface area then it is feasible to apply Silcor Primer PU 30. All blisters in the bitumen sheets should be star cut and the substrate beneath dried fully with a vac and hot air gun. All cut edges and debonded laps should be re-bonded with Adcor® Adhesive MS. Remove all un-bonded mineral stones.
Where bitumen sheet roofs have surface defects in excess of 15% of the total surface area, it is not feasible to apply Silcor Primer PU 30. Remove all bitumen sheets and residues from the substrate to expose the structural deck. Use Silcor Primer EPF on all concrete substrates where bitumen sheets have been removed.
The substrate humidity before application of the primer must be less than 5%. The primer surface humidity before application of Silcor liquid membrane must be less than 5%.
2. Mixing
Mix with a slow speed paddle mixer (less than 300 rpm) for 3 minutes in order to obtain an homogenous mixture.
3. Application
Application temperature range 5°C to 30°C. Apply Silcor Primer PU 30 to the surface by brush or roller, ensuring coverage of the entire surface. Silcor Primer PU 30 should be applied at a typical consumption rate of 0.2-0.3 kg/m2.
Product Advantages
- Solvent free - does not soften bitumen.
- Elastic - complements Silcor liquid waterproofmembranes.
- Low viscosity - easy application.
- Heat and frost resistant.
Coverage rates will vary depending on surface irregularity. The primer should be applied to give full substrate coverage but should be applied as thinly as possible to prevent ponding. Do not allow primer to pond, to avoid risk of bubbling.
Apply Silcor liquid waterproofing within 24-48 hours of primer application. Do not scatter sand on Silcor Primer PU 30. If application of Silcor liquid waterproofing to the primer is delayed beyond this time, re-prime with a second coat of Silcor Primer PU 30.
4. Curing
Allow the primer to cure typically for 24-48 hours.
| Supply | |
|---|---|
| Unit of Sale | |
| Silcor Primer PU 30 | 10 kg metal can 20 kg metal can |
| Ancillary Products Adcor Adhesive MS |
310 ml cartridge |
Details shown are typical illustrations only and not working drawings. For assistance with working drawings and additional technical advice please contact GCP Technical Services.
| Technical Properties | |
|---|---|
| Property | Typical Value |
| T-peel adhesion to bituminous felt, with mineral surface |
> 1.0 N/mm (>90% felt cohesive failure) |
| Elongation | > 350% |
| Solids Content | 100% |
| Overcoat time | 24-48 hrs |
| Full cure | 7 days |
All declared values shown in this data sheet are based on test results determined under laboratory conditions and with the product sample taken directly from stock in its original packing without any alteration or modification of its component parts.
Storage
All products should be stored internally, in original packaging at temperatures between 5°C and 25°C Protect products from all sources of direct sunlight, moisture, frost and direct sunlight.
Shelf life 9 months maximum.
Warranties
GCP Applied Technologies and trained applicators can provide warranties for individual projects. Contact GCP for further details.
NBS Specification Clause
Refer to Clause J30/130 and J31/130.
Health and Safety
Read the product label and Safety Data Sheet (SDS) before use. Users must comply with all risk and safety phrases. SDSs can be obtained from GCP Applied Technologies.
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We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations, and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.
SILCOR is a trademark, which may be registered in the United States and/or other countries, of GCP Applied Technologies Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.
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This document is only current as of the last updated date stated below and is valid only for use in the United Kingdom. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on www.gcpat.uk. Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.
Last Updated: 2022-11-24
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