BOSTIK PU91 Polyurethane Construction Sealant 300ml Grey User Guide

PU91 Polyurethane Construction Sealant 300ml Grey
User Guide

YOUR SMART ADVANTAGES

• Extremely elastic
• High modulus
• Bubble and Primer free
• Suitable for Interior and exterior use.

USES

BOSTIK PU91 SILICONE is a professional grade polyurethane, developed for construction joints subject to high movement. High modulus, elastic, bubble and primer free  and is suitable for interior and exterior applications.
BOSTIK PU91 POLYURETHANE demonstrates good adhesion to a wide range of construction materials. It is a universal sealant for sealing construction, expansion joints,  perimeter, siding joints, precast concrete joints, modular housing and prefabrication, joints in pedestrian walkways and is suitable for roofing applications.
With excellent slump and sag properties, it is subject to minimal shrinkage and no outgassing during cure.
The low MDI technology is not classified as hazardous.
BOSTIK PU91 POLYURETHANE is excellent for weatherproofing exterior joints subject to high movement and remains permanently elastic. It is suitable for façade and  expansion joints in both horizontal and vertical orientation.
Meeting the requirements of BS EN 15651:2017- parts 1 and 4; Sealants for façade and pedestrian walkway joints.

PRODUCT CHARACTERISTICS

Product Code
Suppled in aluminium
Cartridges.| 30623108 White 310ml x 12
30623103 Black 310ml x 12
30623104 Grey 310ml x 12
30623143 Brown 310ml x 12
Storage/Shelf Life| Up to 15 months.*

TYPICAL IN HOUSE PERFORMANCE DATA (Approx.)

skin formation time frame

DIRECTIONS FOR USE
IMPORTANT: Before using BOSTIK PU91 POLYURETHANE refer to the relevant Health & Safety Data Sheet, available at www.bostik.com/uk
STORAGE CONDITIONS
*Store for up to 18 months from Production date when stored in original, unopened packaging under cool, dry conditions within the temperature range +5°C to +25°C and  out of direct sunlight. Protect from frost.
PREPARATION

1. Work in warm (+5°C to +40°C) well-ventilated conditions.
2. Ensure you have all necessary materials required.
3. Joint surfaces must be clean, sound and free from dust, loose material and other contaminants that may impair adhesion. The product is tolerant of damp conditions,  should the surfaces be awash consider discontinuing usage.
4. If desired, place masking tape along the joint edges before application. This can make it easier to make a neat, tooled finish and not contaminate nearby surfaces. Use a  spatula with a round end to tool the sealant and check that it fits into the gap between the masking tape so that it catches the excess sealant.
5. Do a test run without applying any sealant to ‘get a feel’ for the difficult areas to seal such as corners and raised joints.

APPLICATION

1. Unscrew the nozzle if fitted, and using a suitable tool, carefully pierce the metal membrane contained in the thread of the cartridge, taking care not to damage or shorten  the thread. Screw the nozzle onto the cartridge.
2. Cut off the tapered end of the nozzle at a 45° angle, to a width matching the gap to be sealed.
3. Fit the cartridge into the cartridge gun by pressing the release plate and pulling out the plunger. Insert cartridge and repeatedly squeeze the trigger until the sealant  appears.
4. Place the nozzle at the start of the gap, and gently squeeze the trigger. Push forward slowly, ensuring that contact is made by the sealant with both sides of the gap. At the end of the run, release the trigger and press the plunger release plate of the gun to stop the flow of material.
5. A joint with the correct dimensions is essential to absorb movements between building materials. The joint depth should always be in the correct relationship of the joint  width. Backer rod should be used to facilitate this.
6. A general rule is the ratio of joint depth to the width of the joint with a joint width up to 10mm is 1:1, with a minimum of 5 mm in width and depth.
7. For joints wider than 10 mm, the depth is the width divided by 3 plus 6 mm.
8. Within the working time of the product Smooth the sealant with a wet, round ended tool (do not use a wetted finger), remove any excess with a cloth moistened with  white spirit and then remove the masking tape (if used) from either side of the bead.
9. If the application is in a damp or wet environment, the sealant must be tooled to allow the water to run off the surface.
10. After use, ensure to wipe away any excess sealant from the nozzle. Replace the cap if appropriate.
11. The sealant skins over slowly (approx. 90 minutes) and is fully cures through approx. 2-3 mm/ 24 hours depending on bead width, temperature and humidity.

CLEANING

Uncured Sealant:
Excess uncured sealant should be removed mechanically using a soft scraper. The remainder can be removed using a cloth just moistened with white spirit or soapy water.  Repeat using another clean cloth moistened with white spirit  or soapy water.
Cured Sealant:
There is no adequate solvent; carefully cut away excess with a very sharp knife. Do not use solvent to remove product from skin – use soap and water.
* PAINTABILITY
BOSTIK PU91 POLYURETHANE is paintable with water based and most 2 component paints.
The use of solvent bourne alkyd resin paints is not recommended as drying times are extended.
For bset results the paint should be applied within a few days of application
PRECAUTIONS IN USE
BOSTIK PU91 POLYURETHANE cannot be applied to surfaces which have frost or ice on them. Do not use in swimming pools or under constant water immersion. Do not use for aquarium applications. Prevent entry of uncured sealant into drains or watercourses. Do not use on or against bitumen. Not suitable for bedding double  glazed/insulating glass units into frames. Reserved for industrial and professional use.
Not suitable for PE, PP, PC, PMMA, PTFE, soft plastics, neoprene and bituminous substrates.
For any application not covered please contact Technical Services on +44 (0)1785 272625 or visit www.bostik.com/uk for advice.

Recommendations and suggestions are for guidance only, since conditions of use are completely beyond our control.
For health and safety instructions, first aid measures and spillage and disposal instructions see separate Health and Safety Data Sheet for BOSTIK PU91 POLYURETHANE, available at www.bostik.com/uk

BOSTIK HOTLINE
Smart help +44 (0) 1785 272625

www.bostik.com/uk

BOSTIK HOTLINE
Smart help +44 (0) 1785 272625

This disclaimer is issued by Bostik Limited (“the Company”) and applies to the use of any products supplied by the Company (“the Products”) displayed on this Technical  Data Sheet (“TDS”). Please read this disclaimer carefully before using any of the Products. Using this TDS and/or the Product constitutes your acceptance of this disclaimer.  Its contents shall prevail over any directions of use and any disclaimer and/or exclusion or limitation of liability of the Company which may appear on the packaging of the  Products.
This disclaimer sets out the entire financial liability of the Company (including any liability for the acts or omissions of its employees, agents and sub-contractors) to any user  of the Products (“Product User”) in respect of any use made or resale by the Product User, of any of the Products in this TDS.
This disclaimer does not affect the Company’s liability for death or personal injury arising from the Company’s negligence in respect of the Products, nor its liability for fraud,  or fraudulent misrepresentation, nor any other liability which cannot be excluded or limited under applicable law.
The Company’s total liability however arising and whether caused by tort (including negligence and breach of statutory duty), breach of contract or otherwise, arising in  connection with the use made or resale by the Product User of any of the Products in this TDS shall be limited to the price paid for the Product by the Product User.
The Company shall not be liable to the Product User for any pure economic loss, loss of profit, loss of business, depletion of goodwill or otherwise, in each case whether  direct, indirect or consequential, or any claims (including in respect of personal injury insofar as not caused by the Company’s negligence) for consequential compensation  whatsoever (howsoever caused) which arise out of or in connection with the use made or resale by the Product User of any of the Products in this TDS.
The Company shall not be liable to the Product User in relation to any loss for any use which is inappropriate or use which is otherwise than in accordance with the relevant  instructions for use of the Products in this TDS or on the Product. Product Users are advised to confirm the suitability of the Products by their own tests.
This TDS covers just one of a large range of products supplied by the Company.
Full information on these products and advice on application is freely available from our fully trained staff throughout the country.
In addition, specialist technical advice is available from our Technical Services Department. This TDS supersedes all previous TDSs relating to the Products, and users of it  must ensure that it is the current issue. Destroy all previous TDS, and if in any doubt, contact the Company, quoting the code number in the top right hand corner on the  front of this document.

Sales
Technical Advice
Safety Data Sheets
Tel: 0844 371 1192
Tel: 0844 371 1197
Tel: 01785 272625
customer.service@bostik.com
technical.service@bostik.com
sds.box-eu@bostik.com

References

• Construction Adhesive | Trade Adhesive | Industrial Adhesive | Bostik UK
• Construction Adhesive | Trade Adhesive | Industrial Adhesive | Bostik UK

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