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FAQs

FAQs - HPMC & HEMC

What are the characteristics of HPMC?

HPMC has the effect of thickening, water retention, PH stability, excellent film formation, sag resistance, enzyme resistance, dispersion, and cohesion.

What are the purposes of HPMC for construction?

HPMC is a non-ionic cellulose, the original raw material is a natural polymer going through chemical processing. It’s the perfect choice for high-quality construction materials additives. Generally, it’s in use for interior and exterior wall putty, dry mix mortar, adhesives, coatings, and self-leveling agents.

How many types of HPMC are available on the market?
Depend on its viscosity level. There are 4 types of HPMC in use generally.
Low viscosity with 400 mPa s, used for self-leveling mortar.
Medium and low viscosity with 20,000-40,000 mPa s, used for tile adhesive, joint filler, anti-cracking mortar, thermal insulation mortar and etc.
Medium viscosity with 75,000-100,000 mPa s, used for wall putty.
High viscosity with 150,000-200,000 mPa s, for thermal insulation mortar powder.
Depend on its dissolving method. There are 2 types of HPMC: fast-dissolving and hot-dissolving.
HPMC dissolves fast in cold water, after 2 minutes, the viscosity level increases to form a transparent viscous liquid. The majority of usage is putty powder, mortar, liquid glue, and coatings.
The hot-dissolving HPMC only shows viscosity when the temperature drops to a certain level. Primarily in use for putty powder and mortar.
How to store HPMC properly?

Avoid direct sunlight, keep it away from air radiator, water or steam pipes.

What's the dosage of HPMC on wall putty/skim coat?

HPMC on wall putty based on the stated amount and proportion provided, you may use it as normal, or adjust it due to your standard practice.

Could you show me how to prepare HPMC?

According to the provided formula, add 1-2 parts of HPMC into 50-100 parts of absolute ethyl alcohol, stir it and make HPMC fully dissolved, after that slowly add 5-10 parts of water, continue stirring, and leave it for 10-30 minutes, then you get a transparent, gelling texture of HPMC liquid.

What is the specific ratio of HPMC in hand soap or dish detergent?

The general ratio for adding HPMC to achieve desired viscosity in hand soap or dish detergent is between 0.1% to 1% by weight. However, the exact ratio may vary depending on the product’s specific formulation.

 

For more precise recommendations, WOTAI has experts who can customize a formula based on specific product requirements. Please feel free to consult us for further assistance.

What is the difference between your HPMC product and pharmaceutical-grade HPMC?

Pharmaceutical-grade HPMC has higher purity and fewer impurities than general HPMC products.

What is the relationship between viscosity and temperature for HPMC? What should be considered during practical use?
HPMC viscosity decreases with increasing temperature. The stated viscosity usually refers to a 2% water solution at 20°C. In regions with significant temperature variations (summer and winter), using lower viscosity in winter is advisable to facilitate application.
What factors affect the stability of HPMC water solutions and its viscosity?
The stability of HPMC water solutions is influenced by its susceptibility to acid hydrolysis. Leading to chain breakage and viscosity reduction. The rate of hydrolysis increases with higher temperatures and greater H+ concentration. To mitigate this, HPMC water solutions should be buffered at a pH range of 6 to 8 and kept at low temperatures to minimize acid hydrolysis. Alkaline conditions, as well as the presence of dissolved oxygen and oxidants. It can also degrade HPMC and reduce solution viscosity. For instance, peroxides and sodium hypochlorite can accelerate HPMC degradation under alkaline conditions. Additionally, exposure to ultraviolet light can lead to viscosity reduction over time.

FAQs - Orders and Delivery Related

How long does it take to receive my order?

The lead time is 7 to 30 days normally, but due to covid-19 pandemic, the delivery may be delayed, but we will ship out as soon as possible once we have the green light.

What are the packaging dimensions for cellulose ether and RDP powder?

The packaging dimensions for cellulose ether are 43 cm x 15 cm x 85 cm, while the packaging dimensions for RDP powder are 54 cm x 14 cm x 65 cm for a 500 kg bag.

What are the dimensions of the pallet used to transport these products?

The pallet dimensions are 110 cm x 110 cm x 120 cm.

What is your shipping process after we make payment?

We support 30% TT plus 70% payment before delivery.

Once the order is placed, we immediately send you a sales contract and a PI for confirmation.

After we received your 30% advance payment, it will take about 5-7 working days to manufacturing/stocking the products. At the same time, we will book the voyage for your shipping.

We will send you the stocking videos after the stock is ready. At this point, we’ll collect the balance from you.

Once payment is confirmed, we will share the loading pictures and shipping details. For example, the BL NO., container number, and your consignment details.

Within 7 days of the BL date, we will share the BL invoice, certificate of origin, pack list, or other documents via DHL/Fedex as per your request.

If I want to maximize the number of goods to save transportation costs. What options are available to ensure the quality of our goods without using pallets to pack more goods?

If you wish to pack goods in a container without using pallets to save costs, we recommend using our 3-layer waterproof packaging bags to ensure the quality of your goods. However, please note that loading and unloading goods can be more challenging.

 

Without pallets, there is no waterproof film, which may result in moisture damage. 

 

Additionally, sealed bags of powder may leak during transport. Also, we must consider the weight limit imposed by the shipping company. 

 

  • A small container has a weight limit of 20 tons, while a high cube container has a weight limit of 28 tons. 
  • Within the weight limit, a small container can hold 14 tons of HPMC (14198kgs gross weight, 560 bags)
  • A high cube container can hold 27 tons of HPMC (net weight 27380kgs, 1080 bags). 

We will dry the container before shipment to ensure the quality of the goods. Moreover, we also provide complimentary marine insurance at the same time.

Can you support neutral packaging?
Typically, WOTAIchem provide products in standard packaging. However, if you reach the required minimum order quantity, we can offer neutral packaging upon request.
Can you deliver the goods without pallets?
While we can ship the goods without pallets, we do not recommend it. Shipping without pallets increases the risk of product damage during transportation. This option may lead to potential losses.

FAQs - After Purchase Questions

How do you guarantee your product quality?

Quality is the basic foundation and crucial factor to our business, we only provide premium quality at a reasonable price. Our QA inspector is stationed in our factory and they check every link from sourcing to production.

Do you also provide pharmaceutical grade HPMC?

Not at the moment, but we will provide more categories in the future.

How many gram is your free sample?

Each bottle contains 200 grams, we offer 200-600 grams depend on your needs.

How many types of polypropylene fibers do you have?

Polypropylene fibers mainly include two categories: microfibers and macro fibers. We manufacture and supply macro fibers only.

FAQs - General Questions

I'm confused about your company name. Is it Yuanwang or Wotai?

Yuanwang Imp&Exp Co., Ltd is a state-owned organization supported by the Chinese government.

 

WOTAI chemical belongs to the YuanWang group. It’s a construction additives brand focusing on quality and effective solutions. Our products are being used in building materials, such as wall putty, tile adhesive, EIFS/ETICS, self-leveling, gypsum plasters, etc.

Why does WOTAI's HEC product viscosity label differ from other brands?

The production process in China differs from that of Europe, America, and other regions. Our cellulose ether is made from refined cotton, while Europe and America mainly use wood pulp. However, the quality of our product is not compromised, and it still performs exceptionally well.

 

If you have further questions about HEC, please feel free to contact us, and we welcome your sample testing at any time.

Is your product viscosity level higher than other brands in the market?

Yes, compared with other brands, our product viscosity is slightly higher. Our intention is to help you reduce the amount so that to cut costs.

What is the difference between 1% viscosity and 2% Brookfield viscosity in cellulose ether parameters?

To facilitate the comparison of different parameters, we have summarized the numerical comparisons in a table for your reference based on your specific usage requirements. Please send an inquiry to discuss the corresponding product parameter and conversion.

viscositt-conversion

FAQs - Product Applications

Can you share the formula for tile adhesive?

Absolutely. Our RD experts have assisted numerous customers in creating new formulations to enhance their previous ones. The tile adhesive formula consists of HPMC, RDP, and HPS. For accurate dosage information and any other concerns, please email us at info@wotaichem.com. We will be happy to assist you.

What is the recommended amount of calcium formate for tile adhesive used?

We recommend adding 1 kilogram of calcium formate for every ton of dry tile adhesive powder at room temperature. When the temperature is below 5°C (41°F), we suggest increasing the amount to 2-3 kilograms. You may further increase as the temperature continue to drop. However, the specific recipe may vary depending on your actual situation.

 

*Please note that this is a general guideline, and it is always recommended to consult with a WOTAI professional. Contact us today for free samples. We will help you analyze and determine the best possible solutions!

In the application of white cement, do cellulose and calcium formate have opposite effects?

Calcium formate acts as an accelerator in cement, influencing both the setting and hardening time by accelerating the formation of tricalcium aluminate silicate. Depending on the dosage, calcium formate can significantly modify the initial workability of the wet mortar.

Cellulose, on the other hand, functions as a water-retaining and thickening agent. It can extend the open time of the mortar. However, it does not simply make the mortar “dry slowly.” The primary role of cellulose ethers is to provide sufficient water retention for plastering. This allows the cement to solidify and develop strength before drying. The dissolved cellulose ethers in the mortar matrix largely determine its rheological properties, which, in turn, affect the workability of rendering.

What are the recommended HPMC, PCE, and PP Fiber dosages for concrete pouring?
For concrete pouring, we recommend the following dosage guidelines:
  • HPMC: 0.2%
  • PCE: 0.2%
  • PP Fiber: 0.1%
Please note that these are general recommendations and should be used as references. Adjustments to the specific formulation are necessary based on individual requirements, as different applications and market conditions may vary. Our professional team is available to provide further consultation on tailored formulations.
Which construction additives play a role in the dryness of wall putty?
Cellulose ether additives starts acting immediately. In contrast, the RDP(Redispersible Polymer Powder) starts showing strength on the third day, and reaches the first peak on the seventh day. And the second peak in the second week, and achieves maximum value at 21 days.
*Indicators: initial tensile strength, water resistance, compressive, and flexural strength.
Why is maintaining a construction temperature above 5°C during putty application necessary?
The organic additives in the putty need to dissolve properly during the process. Lower ambient temperatures will slow the dissolution process. It results in the slow dissolving of additives. Inadequate dissolution affects the putty’s workability and final film quality. Finally, leading to the wastage of additives. And compromising the overall performance of the putty application.
How to calculate the consumption of dry putty for decoration purposes?
Here are the calculations from WOTAIchem experts:
> The theoretical consumption is 1 kg/sqm (applied with 0.5mm ~ 1mm thickness, two coats).
> Dry putty usage = theoretical consumption × putty application area.
> Putty application area = interior floor area × (3.5 ~ 4).
Why must a clean and dust-free wall surface be essential before putty application?
The proper putty application creates a strong bond between the putty and the wall. Dust and loose particles hinder this bonding process. These issues may lead to poor adhesion results. Finally, the putty may crack due to insufficient adhesion during the curing process and environmental changes.
What are the essential aspects to consider when using wall putty?
As some putty can be dry and challenging to apply, wall putty workability and water retention are important factors.
To ensure optimal performance and long-lasting results on various surfaces under different environmental conditions.
Here are 3 more factors you also need to pay attention to:
1. Heat-resisting property.
2. Water-resisting property.
3. The appropriate mixing ratios for your formulations.
Does HPMC affect the powder drop issue in putty?
The main cause of powder drop in putty is related to the cement quality you used. The cement’s low calcium content and improper CaO/Ca(OH)2 ratio lead to powder drop. However, if HPMC has poor water retention, it may also contribute to this issue.
What can be done when the road repair material foams excessively, has poor flowability, and cracks?
We recommend adding cellulose, an anti-forming agent, and PCE superplasticizers to your formulation. However, the specific dosage of these additives should be determined based on the application type. The environmental conditions you are dealing with are also important for formulation.

FAQs - Concrete Fibers

Why do you need PP, PVA, and Macro fibers, and under what circumstances?

Polypropylene fiber (PPF), polyvinyl alcohol fiber (PVA), and PP Macro Fiber are not limited to certain scenarios. However, here are some common uses:

 

Single-filament for exterior walls. PPF, PVA, and coarse fibers can be used in exterior wall systems to enhance strength and flexibility.

 

 Structural mesh filament. Fibers, including PPF and PVA, can be used as reinforcement materials within concrete structures. They improve crack resistance and durability.

 

 Coarse fiber, such as PP Macro Fiber, applies to various projects requiring high strength and durability.

 

One significant application of steel fiber is in industrial flooring. And there are two major manufacturers located in China. The length of their steel fibers typically ranges from 65-70 mm, which is larger than steel needles. The steel fibers are arranged and bonded using adhesive to form continuous rows. This arrangement helps reduce the volume ratio, saving transportation costs and facilitating dispersion.

 

Imitation steel fiber (PPTF) is a recommended alternative for structural buildings.

Where should polypropylene(PP) be added to construction projects?

Adding polypropylene fibers(PPF) in concrete has a strict process.

 

Normally, the mixing time needs to be extended when adding fibers to concrete. After adding the fibers, the mixing time should be extended by 10 to 20 seconds.

 

There are also specific requirements for the sequence of adding materials. First, add aggregates (stone or sand), then add the fibers, and finally, add more aggregates. This sequence helps prevent the fibers from being added to the surface.

 

A dry mixing process should also be conducted for 10 to 20 seconds before proceeding with wet mixing.

FAQs - Superplasticizers

Will the use of superplasticizers affect the initial setting time of cement?

WOTAIchem’s high-quality superplasticizers are also known as water reducers. It does not affect the initial setting time of cement. Our superplasticizers are designed to enhance the flowability of concrete. It is crucial to consider the setting time during construction, ensuring that the initial setting time is not excessively short nor the final setting time unnecessarily long.

The initial setting time for Portland cement should not be earlier than 45 minutes. And the final setting time should not be later than 390 minutes. Similarly, the initial setting time for ordinary cement should not be earlier than 45 minutes. And the final setting time should not be later than 600 minutes. If the cement’s setting time deviates from these specifications, it may be considered unsuitable for use.

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