Quick facts
- Base resin
- SPR 301 RB — liquid isophthalic resin
- Bought by
- Anchoring-compound manufacturers
- Finished capsule
- Made and qualified by a compound maker; not sold on this site
- Reference cure
- BPO 7% + cobalt octoate approx. 0.4%, added separately
Two products at two stages
SPR 301 RB is a high-strength isophthalic liquid base resin. The catalogue lists it for the manufacture of rock-bolt anchoring compounds for mining reinforcement systems, and states plainly that it is the liquid resin, not the finished mineral-filled mastic or capsule.
The finished capsule or mastic is a different product made further down the chain. A compound maker takes a base resin, adds fillers and cure components to its own formulation, packages the result and qualifies it. That is the product a mine or tunnelling contractor installs, and it is not sold on this site.
Which one you need
If you manufacture anchoring compounds, SPR 301 RB is a candidate base resin. State the gel-time grade your product needs — the catalogue lists ultra-fast grades at 15 seconds–2 minutes and delayed grades at 5–30+ minutes — and plan the cure around the reference system: BPO 7% with cobalt octoate at approximately 0.4%, added separately. A concentrated peroxide is never mixed directly with a cobalt accelerator.
If you install rock bolts, you need a finished, qualified anchoring product from a compound maker, chosen against your project’s specification. The base resin cannot be placed in a borehole on its own.
What the data does not tell you
Resin values do not describe anchoring performance. Pull-out behaviour, set time underground and the shelf life of a capsule belong to the compound maker’s formulation and testing. Samrat FRP Traders does not publish, certify or guarantee anchoring performance, and this guide makes no such claim.
Sources, roles and the Nepal enquiry path
SPR 301 RB values are the typical specification in the supplier’s 2026 product catalogue; no Technical Data Sheet for this grade has been published on this site. The description of a finished capsule is general and does not refer to any particular product.
Samrat Poly Resins, India manufactures the grade and issues its technical information. Samrat FRP Traders is the Nepal supplier and importer and handles enquiries; price, packaging, lead time and stock in Nepal are confirmed on enquiry.
Base resin vs finished anchoring product: selection table
| Criterion | Rock Bolt Grade Resin (SPR 301 RB) | Finished anchoring capsule or mastic |
|---|---|---|
| Who buys it | Manufacturers of rock-bolt anchoring compounds | Mines and contractors installing rock bolts |
| Form | Viscous liquid resin, 2,000–3,500 cPs, supplied non-accelerated | A packaged, mineral-filled product ready to install |
| What it contains | Isophthalic base resin; 35–39% styrene by weight; specific gravity approx. 1.12 | Base resin plus the maker’s fillers and cure components, to the maker’s formulation |
| Cure | BPO 7% + cobalt octoate approx. 0.4%, added separately | Set by the compound maker’s formulation and packaging |
| Gel / set time | Ultra-fast grades 15 seconds–2 minutes; delayed grades 5–30+ minutes | Declared by the compound maker for each product |
| Who qualifies performance | No anchoring performance is published for the resin | The compound maker’s testing, against the project’s specification |
| Available here | Yes — through Samrat FRP Traders on enquiry | No — not sold on this site |
| Choose when… | You formulate, fill and package anchoring compounds | You need capsules to install: buy from a compound maker |
Source: SPR 301 RB values from the supplier’s 2026 product catalogue. The capsule column describes the product category in general terms; no finished capsule is sold or specified on this site. Typical values describe a grade; they are not batch guarantees or acceptance limits.
Frequently asked questions
Does Samrat FRP Traders sell rock-bolt capsules?
No. It supplies SPR 301 RB, the liquid base resin that compound makers use. Finished capsules come from a compound maker.
Can SPR 301 RB go straight into a borehole?
No. It is a raw material for making anchoring compounds, not a finished mastic or capsule.
How strong is an anchor made with SPR 301 RB?
No anchoring performance is published for the resin. It depends on the finished compound and is established by the compound maker’s testing.
Which gel-time grade should a compound maker order?
The one the product needs: ultra-fast grades gel in 15 seconds–2 minutes and delayed grades in 5–30+ minutes. State it when you enquire.