A printer friendly copy is available here
An Application/Specification Guide is available here.
POLYBOND Polybond Limited, Unit 6 William Street, Northam, Southampton, Hants. S014 5QH Tel: 023 80 223266 Fax: 08700 527587 |
Universal PVA
Description
Polybond Universal is a medium viscosity homopolymer emulsion of Vinyl Acetate. The emulsion is stabilised with polyvinyl alcohol and is plasticised with 10% (on polymer solids), of a dibenzoate blend.
Properties/Applications
Polybond Universal has good adhesive properties to a wide range of substrates, such as wood, concrete, paper etc. It has pseudoplastic flow characteristics and good storage stability. Undiluted, it passes the requirements of the bond strength test contained in British Standard 5270:Part 1:1989.
Suitable application areas include :
Physical Data
| Plasticiser | Dibenzoate Blend |
| % Plasticiser (on polymer) | 10% |
| Total Solids | 45 +/- 1% |
| pH | 4.0 to 6.0 |
| pH Stability | 2.0 to 10.0 |
| Particle Size Range | 0.5 to 1.5 µ approx |
| Free Monomer Content | Less than 0.5% |
| Specific Gravity @ 25°C Typical Value | 1.06 |
| Freeze Thaw Stability | Poor |
| Borax Compatibility | Unstable |
| Minimum Film Forming Temperature | 2°C to 6°C |
| Viscosity @ 25°C Brookfield RVT Spindle 5 at 20 rpm | 90 - 110 poise |
Evaluation Results Summary
| Standard : | BS 5272:Part 1:1989 Bonding Agents for use with gypsum plaster and cement. Part 1. Specification for Polyvinyl acetate (PVAC) emulsion bonding agents for indoor use with gypsum building plasters. |
Product Reference : Polybond - ten random samples from production runs.
Results Summary
| Section | Specification | Polybond |
| 2. Composition | Vinyl Acetate Homopolymer | Complies |
| 3. Solids Content | 45 +/- 1% | |
| 4. Saponification Value | 575 to 652 mg KOH/g | 626 mg KOH/g |
| 5. Acid Value | <=10mg KOH | 3.2 mg KOH |
| 6. Ash Residue | <=2% by mass | 0.74% |
| 7. Low Temp. Film Formulation | Continuous Film @ 2°C | Complies |
| 8. Bond Strength | <=230kN/m² | 355kN/m² |
Comments
Polybond complies with all tested sections of BS 5270:Part1@1989.
NOTES
In order to comply with section 3 of BS5270:Part 1:1989, the manufacturer should establish and quote the preferred dilutions of the product which will produce the following minimum dry coating masses when applied to the surface shown :
Reference to VS 5492 should be made for definitions and examples of surfaces of different degrees of suction.
For guidance, the following dilutions have been established for Polybond
| Low Porosity Substrate | Neat / Undiluted application |
| Medium Porosity Substrate | 2.5 parts Polybond : 2 parts water |
| High Porosity Substrate | 1 part Polybond : 2.5 parts water |
| Product Reference No: PVA | Amendment date August 2002 |
Stronger than Strength Itself
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Polybond Ltd
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The claims made in this document are made in good faith and are based on exhaustive tests carried out over a long period.
Polybond Ltd., their agents and their distributors cannot accept any liability for the behaviour of their materials in individual cases.
| A printer friendly copy is available here | |
| An Application/Specification Guide is available here. |
A Health and Safety Reference Datasheet is available here |