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Before discussing application, agree on what the percentage measures, which solvent is used and whether other ingredients are present. “20% PHPS” on a purchase request and “20% solids” on a quote may describe different materials. Settle these details before ordering to avoid reworking the trial after delivery.
Start with the IOTA PHPS perhydropolysilazane coating material page.
It lists 20% solids and “butyl ether,” but also mentions small amounts of organic polysilazane, nanofillers and other additives. The page alone does not establish that the delivered product is 20% pure PHPS and 80% dibutyl ether.
Specify the percentage so quotes can be compared
If you need an 18% PHPS solution by mass, say so and state what is acceptable in the balance. Avoid writing only “18% concentration.” Solids content is generally measured by an agreed method. Whether it represents PHPS mass fraction depends on the composition and how the measurement is defined.
|
Inquiry item |
What to specify |
What the supplier should confirm |
|
Concentration |
18% or 20% by mass and allowable range |
PHPS content or solids measured by a specified method |
|
Solvent |
Dibutyl ether; request verification of the English name and CAS number |
Actual solvent identity and whether it is a blend |
|
Other ingredients |
Whether fillers, catalysts or modifiers are acceptable |
Differences between a pure solution and a formulated coating |
|
Application |
Substrate, method, target dry film thickness and equipment |
Feasible application and curing conditions |
|
Delivery |
Sample quantity, packaging, storage, transport and documents |
Current specification, TDS and SDS |
The website says “butyl ether,” while the packaging notes mention “dibutyl ether” among solvent options. Confirm the actual solvent in the current SDS and written specification. An abbreviated name does not identify the solvent in a particular batch.
Do not rank application performance by 18% versus 20%
Even with a single spray pass, dry film thickness depends on how much is applied, flow, evaporation and the application method. Similar concentrations do not guarantee the same film thickness or cure. Record the amount used, method and dry film thickness for each trial.
Before diluting, ask the supplier whether it is permitted, which thinner specification applies and how moisture must be controlled. PHPS is moisture sensitive. Do not carry over water addition or solvent mixing practices from conventional coatings. Follow the product documentation for dilution and handling. This article gives no formulation ratios.
Explain what curing conditions you can provide
Having an oven and working at room temperature only are different selection conditions. The website gives reference conditions for room temperature and warm, humid curing. Check the part’s temperature tolerance, ambient humidity, film thickness and available waiting time. A tack-free surface is an observation, not confirmation that the specified cure is complete.
IOTA Silicone Oil (Anhui) Co., Ltd. provides solutions across the silicone value chain and supplies relevant raw materials and documentation. Tell us whether you need a pure solution or a formulated coating so we can confirm candidates and sample arrangements. We do not provide complete formulations or formulation development services.
Start with a documented test panel
1. Check the label, batch, specification and SDS against the composition requested.
2. Follow the supplier’s instructions for storage, opening and sampling. Record appearance. Ask the supplier about cloudiness or gel before treating it as normal.
3. Apply to the actual substrate or a representative coupon. Record surface preparation, film thickness, temperature, humidity and cure.
4. Check appearance, adhesion and the intended function before expanding the trial. Keep conclusions tied to the substrate and method.
Frequently asked questions
Q1 Does 20% solids mean 20% pure PHPS?
It depends on composition and test method. Fillers and other ingredients mean solids content cannot directly represent pure PHPS mass fraction.
Q2 Are 18% and 20% interchangeable?
Check composition, solvent and application requirements, then compare thickness and film formation. The two numbers are not enough.
Q3 Can I dilute it with dibutyl ether myself?
Obtain the permitted thinner specification and handling instructions. Confirm compatibility and safety conditions.
Q4 Do I need all these details for a 100 g sample?
Start with concentration, solvent, substrate, application method and curing equipment. Confirm quantity and sampling terms separately.
Q5 Does room-temperature curing mean the part is ready quickly?
Confirm the required waiting conditions and state of cure. Surface drying time is not full cure time.
Q6 How should I store the delivered material?
Follow the applicable batch instructions for temperature, moisture protection, sealing and transport. Do not reuse storage instructions from other products.
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