Influencing Factors and Control Strategies for Blistering in Neutral Wall Putty: An Experimental Analysis Based on HPMC Dosage, Viscosity, and Ground Calcium Carbonate Fineness
Influencing Factors and Control Strategies for Blistering in Neutral Wall Putty: An Experimental Analysis Based on HPMC Dosage, Viscosity, and Ground Calcium Carbonate Fineness
1 The Nature of Blistering in Neutral Wall Putty
1.1 Blistering Is Not Caused by a Single Raw Material
During the application of neutral wall putty, blistering may appear on the surface as bulges in the putty layer, pinholes, small pits, or localized ruptured bubbles. In essence, these defects indicate that air within the slurry system has not been released smoothly. The air may be introduced during mixing, entrapped during troweling, or released from pores in the substrate. If the slurry can release air in time, a small amount of entrapped air usually does not lead to obvious surface defects. However, if the slurry is too viscous, has strong air-retention properties, the substrate absorbs water too quickly, or the applied layer is too thick, air is more likely to be sealed within the putty layer and eventually form bubbles on the surface.
1.2 Three Key Stages in the Formation of Blistering
Blistering in neutral wall putty usually involves three stages: air entry, air retention, and bubble formation on the surface.
Stage | Main Source or Cause | Effect on Blistering |
Air entry | Air introduced during mixing, air entrapped during troweling, and air released from pores in the substrate | Provides the source of air-related defects |
Air retention | High slurry viscosity, strong water retention, excessively fine powder, and high resistance to air release | Makes bubbles difficult to rise and rupture |
Surface bubble formation | The surface slurry has already developed a certain degree of sealing, while internal air continues to move outward | Leads to surface bulges, pinholes, or small pits |
Therefore, reducing the probability of blistering in neutral wall putty requires simultaneous consideration of the slurry’s water retention, thickening behavior, and air-release performance. Insufficient water retention can affect application quality, while excessive thickening can make bubble release more difficult. A stable formulation adjustment should strike a balance among these three factors.
2 Experiment 1: Effect of HPMC Dosage on Blistering in Neutral Wall Putty
Note: The experimental formulations, dosages, water demand, and blistering performance after wall application discussed in this article are derived from small-scale experimental verification conducted by relevant manufacturers under specific raw material conditions, formulation systems, and application conditions. Since blistering in neutral wall putty is jointly influenced by multiple factors, including the type and dosage of HPMC, powder fineness, water addition, mixing method, substrate condition, and troweling thickness, the data and conclusions in this article are mainly intended as references for formulation analysis, problem diagnosis, and optimization direction. They should not be regarded as fixed conclusions applicable to all neutral wall putty systems. In practical applications, further compound verification should be carried out based on specific raw materials, production processes, and construction environments.
2.1 Experimental Formulation
In the first group of experiments, hydroxypropyl methylcellulose (HPMC) with a viscosity of 100,000 was kept constant, and only the HPMC dosage was varied. The dosages of pregelatinized starch and lubricant were kept unchanged. The purpose was to observe the effect of changes in HPMC dosage on water demand, application behavior, and blistering performance.
The experiment used 2 kg of ground calcium carbonate powder for small-scale testing. In the production formulation, the HPMC dosages were 2 kg/ton, 3 kg/ton, and 4 kg/ton, respectively. When converted to the 2 kg small-scale sample, the corresponding weighed amounts were 4 g, 6 g, and 8 g.
Formulation | Ground Calcium Carbonate | HPMC with 100,000 Viscosity | Converted HPMC Dosage | Pregelatinized Starch | Lubricant | Water Demand |
Formulation 1 | 2 kg | 4 g | 2 kg/ton | 16 g | 1 g | 330 ml/kg |
Formulation 2 | 2 kg | 6 g | 3 kg/ton | 16 g | 1 g | 350 ml/kg |
Formulation 3 | 2 kg | 8 g | 4 kg/ton | 16 g | 1 g | 380 ml/kg |
The 16 g of pregelatinized starch corresponds to a production dosage of 8 kg/ton, and the 1 g of lubricant corresponds to a production dosage of 0.5 kg/ton. The small-scale experimental samples were scaled down proportionally from the production formulation, making it easier to compare the effect of HPMC dosage under the same base formulation.
2.2 Experimental Results
The data show that as the HPMC dosage increased, the water demand of the putty increased significantly. When the HPMC dosage increased from 2 kg/ton to 4 kg/ton, the water demand rose from 330 ml/kg to 380 ml/kg, an increase of 50 ml/kg, corresponding to an increase of approximately 15.2%.
HPMC Dosage | Sample Weight | Water Demand | Change in Application Behavior | Blistering Performance |
2 kg/ton | 4 g | 330 ml/kg | The slurry was relatively light, and air release was easier, but water retention and hand feel were insufficient | Relatively slight |
3 kg/ton | 6 g | 350 ml/kg | Water retention and workability were relatively balanced | Intermediate blistering level |
4 kg/ton | 8 g | 380 ml/kg | The slurry was more viscous, with stronger thickening and water retention | Relatively obvious blistering |
Under the formulation and application conditions of this experiment, the higher the HPMC dosage, the stronger the water retention and thickening effect of the slurry. HPMC forms a certain colloidal structure in water, increasing the viscosity and water-holding capacity of the system, which helps improve the open time and workability of the putty. However, when the dosage is too high, the internal resistance of the slurry increases, making it more difficult for bubbles to rise, migrate, and rupture. As a result, air introduced during mixing and troweling is more likely to remain trapped in the slurry.
2.3 Experimental Analysis
The first group of experiments indicates that, under the conditions of this formulation, an appropriate reduction in HPMC dosage can alleviate blistering to some extent. The sample with a dosage of 2 kg/ton showed relatively slight blistering, indicating that when the slurry viscosity was reduced, air could be released more easily.
However, this adjustment alone cannot serve as the final solution. When the HPMC dosage is reduced, the water retention and application feel of the putty also decrease. If water retention is insufficient, water in the putty may be rapidly absorbed by the substrate after wall application, resulting in problems such as drying too quickly, a rough or dragging feel during application, poor spreadability, and shortened open time. These issues may ultimately reduce the overall product quality. Therefore, HPMC dosage adjustment should follow the principles below:
Adjustment Direction | Beneficial Effect | Potential Risk |
Reduce HPMC dosage | Reduces slurry viscosity and improves bubble release | Water retention decreases, and application feel becomes worse |
Increase HPMC dosage | Enhances water retention and application open time | The slurry becomes sticky, and bubbles are difficult to release |
Moderate dosage | Balances water retention, hand feel, and air release | Further verification is needed in combination with viscosity, powder characteristics, and application conditions |
3 Experiment 2: Effect of HPMC Viscosity on Blistering in Neutral Wall Putty
3.1 Experimental Formulation
In the second group of experiments, the HPMC dosage was fixed at 3 kg/ton, the pregelatinized starch dosage was fixed at 8 kg/ton, and the lubricant dosage was fixed at 0.5 kg/ton. Only the HPMC viscosity was changed. Three HPMC grades with different viscosities—50,000, 100,000, and 200,000—were tested to evaluate their effects on blistering.
Formulation | Ground Calcium Carbonate | HPMC Viscosity | HPMC Weight | Converted HPMC Dosage | Pregelatinized Starch | Lubricant |
Formulation 1 | 2 kg | 50,000 | 6 g | 3 kg/ton | 16 g | 1 g |
Formulation 2 | 2 kg | 100,000 | 6 g | 3 kg/ton | 16 g | 1 g |
Formulation 3 | 2 kg | 200,000 | 6 g | 3 kg/ton | 16 g | 1 g |
In this group of experiments, the HPMC dosage, pregelatinized starch, and lubricant were all kept the same. The main difference came from the viscosity of the HPMC.
3.2 Experimental Results
Wall application tests using this experimental formulation showed that the higher the HPMC viscosity, the more obvious the blistering phenomenon. The sample with a viscosity of 50,000 showed relatively slight blistering, the sample with a viscosity of 100,000 was at an intermediate level, and the sample with a viscosity of 200,000 showed a higher blistering risk.
As HPMC viscosity increases, the plastic viscosity and cohesion of the slurry also increase. An appropriate level of viscosity is beneficial for water retention and troweling performance. However, when the viscosity is too high, the flow resistance of the slurry increases, making it difficult for bubbles to rise and rupture. If bubbles cannot be released in time, they are likely to remain in the putty layer and appear after troweling as surface bulges, pinholes, or ruptured bubble marks.
HPMC Viscosity | Effect on Slurry | Effect on Blistering |
50,000 | The slurry is relatively light, with lower resistance to air release | Relatively low probability of blistering |
100,000 | Water retention and workability are relatively good, with moderate air-release ability | Medium blistering risk |
200,000 | The slurry is more viscous, with enhanced air-retention tendency | Higher probability of blistering |
3.3 Experimental Analysis
The second group of experiments shows that, when the HPMC dosage remains unchanged, reducing HPMC viscosity can also help alleviate blistering. Compared with simply reducing HPMC dosage, screening lower- or medium-viscosity HPMC is usually more conducive to balancing water retention, workability, and air release.
The reason is that directly reducing the HPMC dosage also weakens water retention. By selecting lower- or medium-viscosity HPMC, it is possible to reduce excessive thickening and air retention while maintaining a certain dosage level. This helps preserve basic workability while improving bubble release.
For this type of ordinary neutral interior wall putty, HPMC grades with viscosities from 50,000 to 100,000 may be prioritized for screening. A viscosity of 50,000 helps reduce slurry stickiness and air retention, while a viscosity of 100,000 offers advantages in water retention and application feel. HPMC with a viscosity of 200,000 is more likely to make the slurry sticky and difficult to deaerate, and therefore should not be the preferred choice in blistering-sensitive systems.
4 Key Factors Affecting Blistering in Neutral Wall Putty
4.1 HPMC Dosage
HPMC dosage directly affects the water retention, thickening behavior, and application feel of neutral wall putty. When the dosage is insufficient, the putty may dry too quickly, feel rough or drag during application, and have a shortened open time. When the dosage is too high, the slurry viscosity increases, making it difficult for internal air to be released.
In the first group of experiments, when the HPMC dosage increased from 2 kg/ton to 4 kg/ton, the water demand rose from 330 ml/kg to 380 ml/kg, and blistering also became more obvious. This indicates that excessive HPMC dosage increases the difficulty of bubble release in the system. However, the insufficient water retention observed in the 2 kg/ton sample also shows that the problem cannot be solved simply by reducing the HPMC dosage. The reasonable range of HPMC dosage should be determined based on water retention, workability, and blistering performance.
4.2 HPMC Viscosity
HPMC viscosity is an important factor affecting blistering in neutral wall putty. The higher the viscosity, the more likely the slurry is to exhibit high thickening, high cohesion, and high air-retention characteristics. High-viscosity products can enhance water retention and application stability, but if the viscosity exceeds the needs of the system, it will increase the difficulty of air release.
In the second group of experiments, when the dosage remained unchanged at 3 kg/ton and the HPMC viscosity increased from 50,000 to 200,000, the blistering risk increased. This indicates that, in this formulation system, adjusting HPMC viscosity is more suitable as a priority optimization direction than simply reducing HPMC dosage.
4.3 Fineness of Ground Calcium Carbonate
Ground calcium carbonate is the main filler in neutral wall putty, and its fineness affects the slurry’s water demand, troweling feel, and air-release performance. When the ground calcium carbonate is too fine, its specific surface area increases, more water is required to wet the powder, and the slurry tends to become more viscous. This increases the resistance to bubble migration and rupture. Properly reducing the proportion of excessively fine powder can help reduce slurry stickiness and improve air release.
However, ground calcium carbonate should not be made coarse without limitation. If it is too coarse, it can affect the smoothness of troweling, surface flatness, and sanding performance of the putty. In practical adjustments, the particle size distribution should be improved through a proper combination of coarse and fine materials, so that the slurry has sufficient fineness without becoming excessively sticky. This section is intended as a mechanistic analysis and formulation troubleshooting direction, and still requires verification through comparative experiments using ground calcium carbonate with different fineness levels.
4.4 Water Addition and Mixing Method
Water addition directly affects the slurry consistency and bubble-release behavior. If the water amount is insufficient, the slurry becomes dry and has high troweling resistance. If too much water is added, the slurry structure becomes weaker, and shrinkage, pinholes, or surface defects may occur after drying. In the first group of experiments, as the HPMC dosage increased, the water demand increased accordingly, indicating that water addition itself is also an important indicator for evaluating formulation status.
The mixing method also affects blistering. Excessively high mixing speed or overly long mixing time can introduce more air, while insufficient mixing may lead to uneven powder dispersion, localized agglomeration, or unstable slurry behavior. During experimental comparisons, the mixing speed, mixing time, standing time, and wall application thickness should be kept as consistent as possible to reduce interference from application variables.
4.5 Substrate Condition and Troweling Thickness
When the substrate absorbs water too quickly, has high porosity, or has a loose surface, water in the putty may migrate rapidly after wall application. Air in the pores of the substrate may also be released outward, increasing the probability of surface blistering. For substrates with strong water absorption or loose surfaces, appropriate pretreatment should be carried out first to ensure uniform water absorption and a stable surface.
Troweling thickness also affects bubble release. If a single layer is applied too thickly, the path for internal air release becomes longer, while the surface slurry may form a certain degree of sealing first. This makes bubbles more likely to become trapped inside the putty layer. During application, the thickness of each layer should be controlled, and multiple thin applications should be used to reduce the risk of internal bubble retention.
5 Improvement Directions for Reducing the Probability of Blistering in Neutral Wall Putty
5.1 First Determine Whether Blistering Is Caused by an Overly Viscous System
If the putty is obviously sticky after mixing, feels heavy during troweling, carries heavily on the trowel, and bubbles are difficult to rupture, it usually indicates that the system has excessive thickening and air-retention tendencies. In this case, the HPMC dosage and HPMC viscosity should be checked first, rather than directly adding other additives. To determine whether the system is overly viscous, the following three observations can be emphasized:
Observation Item | Performance of an Overly Viscous System |
Mixing behavior | The slurry feels heavy, mixing resistance is high, and surface bubbles are difficult to disappear |
Troweling behavior | Trowel resistance is high, the putty is sticky, and bubbles tend to remain after finishing strokes |
Wall application behavior | Bubbles rupture slowly, and surface pinholes or small pits increase |
5.2 HPMC Dosage Should Not Be Reduced Blindly
Reducing HPMC dosage can improve bubble release, but it will also weaken water retention and workability. For ordinary neutral wall putty, it is not recommended to reduce the HPMC dosage too much simply to lower blistering. A more stable approach is to use about 3 kg/ton as the base point, then conduct gradient tests upward and downward while comprehensively observing water retention, hand feel, water demand, and blistering performance.
5.3 Prioritize Screening HPMC with a Viscosity of 50,000 to 100,000
In neutral wall putty systems with obvious blistering, HPMC grades with viscosities of 50,000 to 100,000 should be prioritized for testing. If the current formulation uses HPMC with a viscosity of 200,000 and the formulation shows signs of slurry stickiness and difficult bubble release, the viscosity may first be reduced to around 100,000. If obvious blistering still exists, a 50,000-viscosity grade or a blended solution may then be evaluated. The goal of adjusting HPMC viscosity is to reduce excessive thickening and air retention while maintaining sufficient water retention. Compared with directly reducing dosage, lowering viscosity usually makes it easier to balance workability and bubble release.
5.4 Adjust Ground Calcium Carbonate Fineness and Powder Particle Size Distribution
If blistering still occurs after HPMC dosage and viscosity have been adjusted, the fineness of ground calcium carbonate should be checked next. If the ground calcium carbonate is too fine, the slurry may have high water demand, strong stickiness, and difficulty releasing bubbles during troweling. In this case, the proportion of overly fine powder can be appropriately reduced, and a reasonable particle size combination can be introduced. Adjustments to powder particle size distribution should also be evaluated together with the surface effect. The adjustment can be considered effective only when blistering is reduced, troweling is smooth, and the dried surface fineness and sanding performance remain acceptable.
5.5 Standardize Experimental and Application Conditions
Formulation testing requires control of application variables. The same formulation may show different blistering results under different mixing times, standing times, substrates, and troweling thicknesses. To make the experimental conclusions more reliable, the following conditions should be standardized:
Control Item | Recommended Requirement |
Water addition method | Record the water addition amount and adjust as much as possible to the same application consistency |
Mixing time | Keep all groups consistent to avoid excessive air entrainment in one group |
Standing time | Keep all groups consistent to allow the cellulose ether to fully swell |
Substrate condition | Use the same type of substrate and control differences in water absorption |
Troweling thickness | Control the thickness of each layer to avoid thick application affecting bubble release |
6 Reference Materials for Research on Blistering, Water Retention, Rheology, and Powder Dispersion in Neutral Wall Putty
Table 1 Water-Retention, Thickening, and Rheology-Modifying Materials
Category | CAS No. | Aladdin Cat. No. | Name | Specification or Purity | Product Features and Applications |
Cellulose ether water-retention and thickening agent | 9004-65-3 | Hydroxypropyl Methylcellulose (HPMC) | average Mn ~90,000 | Used for research on water retention, thickening, and troweling feel in putty; suitable for comparative experiments on dosage, viscosity, and blistering performance | |
Cellulose ether water-retention and thickening agent | 9032-42-2 | Methyl 2-hydroxyethyl Cellulose | viscosity 70000–80000 mPa·s, 2% in H₂O (20 °C) | Used for comparative studies on cellulose ether water retention, application consistency, and air-release behavior; suitable for research on the rheological properties of putty | |
Cellulose ether water-retention and thickening agent | 9004-62-0 | 2-Hydroxyethyl Cellulose (HEC) | average Mw ~380,000 | Used for thickening, suspension, and water-retention testing in aqueous systems; can be used to evaluate the effects of different cellulose ethers on slurry blistering and stability | |
Cellulose ether water-retention and thickening agent | 9004-64-2 | Hydroxypropyl Cellulose (HPC) | average Mw ~80,000, average Mn ~10,000, powder, 20-mesh particle size (99% passing) | Used for research on thickening and film-forming assistance in water-soluble polymer systems; can be used as a comparative sample of cellulose derivatives | |
Cellulose ether water-retention and thickening agent | 9004-32-4 | Sodium Carboxymethyl Cellulose (CMC) | Type V, M.W. 90,000 (DS = 0.7), 50–100 mPa·s | Used for testing slurry thickening, water retention, and suspension stability; can be used to study the effect of water-soluble thickeners on bubble retention | |
Cellulose ether water-retention and thickening agent | 9004-67-5 | Methyl Cellulose (MC) | 8–18 mPa·s | Used for comparison of the basic properties of cellulose ethers; can be used to observe the effect of low-viscosity water-retention and thickening materials on application behavior | |
Starch-based workability modifier | 9005-25-8 | P1373823 | Pregelatinized Starch | PharmPure™, USP, ChP, BP, European Pharmacopoeia (Ph. Eur.), pharmaceutical grade | Used for comparison with pregelatinized starch systems and for research on application feel adjustment; can help analyze the effects of starch-based materials on consistency, smoothness, and open time |
Water-soluble polymer rheology modifier | 25322-68-3 | Polyethylene Oxide | viscosity 65–115 cps | Used for research on thickening, lubrication, and rheology modification in aqueous slurries; can be used to observe the effect of polymer chain structure on slurry stickiness and bubble release |
Table 2 Fillers, Pigment Fillers, and Mineral Thixotropic Materials
Category | CAS No. | Aladdin Cat. No. | Name | Specification or Purity | Product Features and Applications |
Main filler | 471-34-1 | Calcium Carbonate | ≥99.95% metals basis | Main filler for neutral wall putty; can be used for research on the relationship between ground calcium carbonate fineness, particle size distribution, water demand, and air-release ability | |
Mineral filler | 1332-58-7 | K431904 | Kaolin | heavy, powder | Used for research on filling, hiding power, and thixotropic performance adjustment; can be used to observe the effect of platy minerals on slurry consistency and application behavior |
Mineral filler | 14807-96-6 | T109493 | Talc Powder | pharmaceutical grade, PharmPure™, ≥325 mesh | Used for research on troweling smoothness, filling performance, and surface fineness; can be used to evaluate the effect of fine powders on water demand and bubble-release behavior |
White pigment filler | 13463-67-7 | T431947 | Titanium Dioxide (IV) | premium grade, ≥99% | Used for research on whiteness, hiding power, and surface appearance; suitable for formulation evaluation of high-whiteness putty and repair materials |
Functional filler and thixotropic material | 7631-86-9 | S433695 | Silicon Dioxide | ≥99% | Used for research on thixotropy, thickening, and structural stability; can be used to evaluate the effect of high-specific-surface-area fillers on slurry viscosity and blistering risk |
Mineral thixotropic material | 1318-93-0 | M758183 | Montmorillonite K-10 | powder | Used for research on thixotropy, suspension, and adsorption performance; can be used to observe the effect of layered minerals on slurry structure and bubble retention |
Mineral thixotropic material | 1302-78-9 | Nanoclay, Hydrophilic Bentonite | — | Used for research on thixotropic structure, suspension stability, and anti-settling performance; can be used to evaluate the effect of mineral gel materials on application consistency |
Table 3 Dispersing, Defoaming/Foam-Suppressing, and Lubrication-Modifying Materials
Category | CAS No. | Aladdin Cat. No. | Name | Specification or Purity | Product Features and Applications |
Base oil for defoaming and foam suppression | 8042-47-5 | Liquid Paraffin | heavy, density: 0.86–0.89 | Used for research on mineral-oil-based defoaming systems and surface adjustment; can be involved in the evaluation of bubble rupture, foam suppression, and lubrication performance | |
Silicone defoaming material | 63148-62-9 | Silicone Oil | viscosity 5 cSt (25 °C) | Used for research on silicone defoaming, foam suppression, and surface tension adjustment; can be used to evaluate bubble rupture effects in putty slurry | |
Polyether defoaming and foam-suppressing material | 25322-69-4 | Polypropylene Glycol (PPG) | average molecular weight 4000 | Used for research on polyether-based defoaming and wetting systems; can be used to analyze slurry foam stability and foam-suppression performance | |
Phosphate ester defoaming modifier | 126-73-8 | Tributyl Phosphate (TBP) | European Pharmacopoeia (Ph. Eur.) | Used for research on phosphate ester defoaming, wetting, and surface adjustment; can be used to evaluate foam control performance in aqueous slurries | |
Phosphate ester defoaming modifier | 126-71-6 | Triisobutyl Phosphate | ≥98% | Used for research on phosphate ester foam suppression, bubble breaking, and wetting performance; suitable for slurry bubble-control experiments | |
Polycarboxylate dispersant | 9003-04-7 | Sodium Polyacrylate (PAAS) | average Mw ~8000, 45% in H₂O | Used for research on powder dispersion, slurry uniformity, and local flocculation control; can reduce application fluctuations caused by poor dispersion | |
Inorganic phosphate dispersant | 7758-29-4 | Sodium Tripolyphosphate | industrial grade, ≥85% | Used for research on powder dispersion and wettability adjustment; can improve filler dispersion and assist in controlling slurry consistency | |
Inorganic phosphate dispersant | 10124-56-8 | Sodium Hexametaphosphate (SHMP) | AR | Used for dispersion research on powders such as calcium carbonate and kaolin; can reduce agglomeration and improve slurry uniformity | |
Fatty acid salt lubricant | 1592-23-0 | Calcium Stearate | Ca 6.6–7.4% | Used for research on putty lubrication, troweling feel, and hydrophobicity adjustment; can improve application smoothness | |
Fatty acid salt lubricant | 557-05-1 | Zinc Stearate | industrial grade | Used for research on smoothness, sanding performance, and surface feel; can be used as a comparative material for putty lubrication additives | |
Fatty acid salt lubricant | 557-04-0 | Magnesium Stearate | industrial grade | Used for research on lubrication, anti-caking, and powder flowability; can be used to evaluate the effect of fatty acid salts on dry powder mixing and application feel | |
Fatty acid salt surface modifier | 822-16-2 | Sodium Stearate | PharmPure™, USP | Used for research on surface activity, lubrication, and foam behavior; can be used to observe the effect of fatty acid salts on the surface state of slurry |
Table 4 Bonding, Film-Forming, and Polymer Modification Materials
Category | CAS No. | Aladdin Cat. No. | Name | Specification or Purity | Product Features and Applications |
Water-soluble bonding and film-forming material | 9002-89-5 | Mowiol® PVA-124 Polyvinyl Alcohol (PVA) | viscosity: 54–66 mPa·s | Used for research on putty bonding, film formation, and toughness modification; can be used to evaluate the effect of polymer film-forming materials on surface quality | |
Polymer bonding modifier | 24937-78-8 | Poly(ethylene-co-vinyl acetate) (PEVA) | vinyl acetate 12 wt.%, melt index 8 g/10 min (190 °C/2.16 kg) | Used for research on bonding, flexibility, and polymer modification; can be used as a comparative material related to redispersible polymer powder resin systems | |
Polymer bonding and film-forming material | 9003-20-7 | Polyvinyl Acetate (PVAC) | approx. M.W. 500,000 | Used for evaluating bonding strength, film-forming performance, and surface continuity; can be used to assess the effect of polymer bonding materials on the integrity of the putty layer |
Note: The above products are mainly intended for scientific research and formulation mechanism comparison in areas such as water retention, thickening, rheology, powder dispersion, and bubble control in neutral wall putty. They are not equivalent to construction-grade additives that can be directly used in industrial putty production. Practical application should be comprehensively evaluated based on product form, dispersion method, application performance, safety compliance, and batch verification. Among them, defoaming and foam-suppressing materials are mostly defoamer raw materials or model materials. In the practical application of industrial dry-mixed putty, powder-type and carrier-type defoamers should be prioritized for evaluation, while attention should also be paid to their effects on dispersibility, cratering, oil spots, adhesion, and surface appearance. For more product specifications, grades, and COA information, please search by “product name/CAS/Catalog No.” on the Aladdin official website.
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