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Dec. 25, 2025
Skim coat and repair mortar formulations need a balanced combination of adhesion,
flexibility, workability, and durability.Redispersible polymer powder (RDP) is commonly
used in dry-mix formulations to modify these properties and improve the performance of the finished mortar.
For formulators and raw material buyers, the right RDP should be selected according
to the application and the performance requirements of the final product rather than
by using a single grade for every formulation.
RDP can contribute to key properties required in cement-based dry-mix mortars, particularly:
1) Bonding strength: Important when the mortar needs reliable adhesion to the substrate.
2) Flexibility: Useful when the formulation requires a better balance between bonding and flexibility.
3) Waterproofing: An additional consideration for formulations where resistance to water is an important requirement.
The actual performance depends on the complete mortar formulation, including cement,
fillers, cellulose ether, additives, water demand, and RDP selection. Therefore, RDP should
be evaluated as part of the finished formulation rather than as an isolated raw material.
The selection process can be kept simple:
Application requirement → Performance requirement → RDP selection
For skim coat and wall putty formulations where bonding strength and flexibility are
important, JINT™-502 is one option to evaluate. It is a high-bonding-strength RDP for
dry-mix mortars, with bonding strength and flexibility listed as its functions.
The product page also identifies wall putty as one of its applications.
For a more general formulation approach, JINT™-503 is a universal-grade RDP for
dry-mix mortars, with bonding strength and flexibility as its listed functions.
It can be considered when a general-purpose RDP is required for wall putty formulations.
Where the formulation requires bonding strength, flexibility, and an additional
waterproofing function, JINT™-745 is worth evaluating.Its product page specifically lists
bonding strength, flexibility, and waterproofing, with wall putty, tile adhesive, and joint filler among its applications.
For repair mortar formulations, product selection should be confirmed through
application testing because the final performance depends on the complete
formulation and the intended substrate.
Before approving an RDP for production, test it in the actual mortar formulation
rather than relying only on powder specifications.
A practical evaluation can include:
1. Bonding performance – compare adhesion or bond strength after the required curing conditions.
2. Flexibility and cracking behavior – check whether the modified mortar meets the formulation's flexibility and crack-resistance requirements.
3. Water-related performance – where relevant, evaluate water resistance using the test method specified for the finished product.
4. Application properties – check mixing, spreading, surface finish, and overall workability under normal production conditions.
Use the same formulation, mixing procedure, curing conditions, and test method
when comparing different RDP grades.
This gives a more meaningful basis for supplier and grade selection.
There is no need to select an RDP simply because it has a broad range of claimed benefits.
The better approach is to define the required performance first and then compare
suitable grades through formulation testing.
JINTEDIFU supplies redispersible polymer powders for dry-mix mortar applications.
For skim coat and related wall putty formulations, JINT™-502, JINT™-503, and JINT™-745
can be evaluated according to the required combination of bonding strength, flexibility, and waterproofing.
For technical selection or formulation evaluation, contact JINTEDIFU to discuss your application and testing requirements.
Name: Molly.Wang
E-Mail:molly.wang@jtdf-rdp.
Mobile:+86 156 5045 0156（Whatsapp）
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