Non Caking Redispersible Polymer Powder: Easy Storage & Long Shelf Life

Redispersible Polymer Powder (RDP) is supplied as a dry powder for use in dry mix mortar formulations. 

For manufacturers and distributors, proper storage is important because moisture, high temperature 

and pressure can increase the risk of powder blocking during storage.

Rather than selecting an RDP only by the term “non-caking,” buyers should consider both the

required mortar performance and the storage conditions.

What Causes RDP Powder to Block?

RDP should be protected from conditions that can affect powder handling.

According to JINTEDIFU product storage guidance, the main conditions to control are:

1) Moisture: Keep the product away from moisture during storage.

2) High temperature: Avoid prolonged storage above 30°C.

3) Pressure: Avoid storing the bags under excessive pressure.

4) Sunlight: Avoid direct exposure to sunlight.

5) Warehouse conditions: Store in a cool and dry warehouse.

High temperature, moisture and storage under high pressure may result in blocking.

How to Store RDP for Better Powder Handling

Good warehouse management can help reduce the risk of blocking:

1) Keep RDP bags sealed and protected from moisture.

2) Store products in a cool and dry area.

3) Avoid direct sunlight and excessive heat.

4) Avoid stacking conditions that place unnecessary pressure on the bags.

5) Follow a first-in, first-out inventory system.

6) Check the manufacturing date before long-term storage.

JINTEDIFU recommends not storing its RDP products for more than six months from the

manufacturing date. If a product has been stored longer than recommended, its properties should be verified before use.

Does “Non-Caking” Mean a Long Shelf Life?

Not necessarily.

Caking or blocking is affected by storage conditions as well as the product itself. Therefore,

“non-caking” should not be treated as a substitute for proper storage management.

For purchasing decisions, it is more useful to check:

- Manufacturing date

- Packaging condition

- Recommended storage conditions

- Storage history

- Product specifications

- Performance after extended storage, when applicable

This is especially important when purchasing RDP in bulk or keeping inventory for extended periods.

How to Choose the Right RDP

Storage stability is only one part of RDP selection. The grade should first match the requirements of the dry mix mortar.

A practical selection process is:

Application → required mortar performance → RDP grade → storage and handling → formulation testing

For example:

General Dry Mix Mortar Applications

RDP JINT™-503 is a universal-grade RDP for dry mix mortars. The official product page lists bonding strength

and flexibility as its functions, with applications including wall putty, tile adhesive and EIFS.

Learn more about RDP JINT™-503

Applications Requiring High Bonding Strength

RDP JINT™-502 is a high-bonding-strength RDP for dry mix mortars and is listed for wall putty, tile adhesive

and EIFS. Its stated functions are bonding strength and flexibility.

Learn more about RDP JINT™-502

Applications Where Waterproofing Is Required

RDP JINT™-745 is a flexible-grade RDP listed for wall putty, tile adhesive and joint filler. Its official functions

include bonding strength, flexibility and waterproofing.

Learn more about RDP JINT™-745

How to Check RDP After Storage

When an RDP product has been stored for an extended period, a simple incoming-material check can be useful.

Check:

1) Whether the powder remains free-flowing.

2) Whether visible blocking or hard lumps are present.

3) Packaging condition and signs of moisture exposure.

4) Key product properties required for the intended formulation.

5) Mortar performance through a small laboratory trial if necessary.

If the product has exceeded the recommended storage period, performance should be verified before production use.

Choosing RDP for Both Performance and Storage

A suitable RDP should first meet the requirements of the mortar application. Proper packaging, warehouse

conditions and inventory management then help maintain the product during storage.

For JINTEDIFU RDP, the selection should therefore follow:

Application requirement → mortar performance → RDP grade → proper storage → performance verification

This approach is more reliable than selecting a product simply because it is described as “non-caking”

or has been stored for a long period.

Name: Molly.Wang

E-Mail:molly.wang@jtdf-rdp.

Mobile:+86 156 5045 0156（Whatsapp）